From 3ffa8acb61775965881044b98ad4bf518daa0c8c Mon Sep 17 00:00:00 2001
From: Alexandr Burdiyan <burdiyan@gmail.com>
Date: Fri, 1 Nov 2024 16:27:10 +0100
Subject: [PATCH] Initial implementation of deletes

---
 backend/api/documents/v3alpha/dochistory.go   |    2 +-
 backend/api/documents/v3alpha/documents.go    |  209 ++-
 .../api/documents/v3alpha/documents_test.go   |  131 ++
 backend/blob/blob.go                          |   10 +
 backend/blob/blob_ref.go                      |   41 +-
 backend/blob/index.go                         |   98 +-
 .../documents/v3alpha/documents.pb.go         | 1528 ++++++++++++-----
 .../documents/v3alpha/documents_grpc.pb.go    |   83 +
 .../documents/v3alpha/documents_connect.ts    |   27 +-
 .../documents/v3alpha/documents_pb.ts         |  441 ++++-
 proto/documents/v3alpha/documents.proto       |  122 +-
 proto/documents/v3alpha/go.gensum             |    4 +-
 proto/documents/v3alpha/js.gensum             |    4 +-
 13 files changed, 2221 insertions(+), 479 deletions(-)

diff --git a/backend/api/documents/v3alpha/dochistory.go b/backend/api/documents/v3alpha/dochistory.go
index 7b1a06f5..f7603610 100644
--- a/backend/api/documents/v3alpha/dochistory.go
+++ b/backend/api/documents/v3alpha/dochistory.go
@@ -52,7 +52,7 @@ func (srv *Server) ListDocumentChanges(ctx context.Context, in *documents.ListDo
 	// We need to just use the database index, but it's currently too painful to work with,
 	// because we don't track latest heads for each space+path.
 
-	doc, err := srv.loadDocument(ctx, acc, in.Path, docmodel.Version(in.Version), false)
+	doc, err := srv.loadDocument(ctx, acc, in.Path, docmodel.Version(in.Version), false, false)
 	if err != nil {
 		return nil, err
 	}
diff --git a/backend/api/documents/v3alpha/documents.go b/backend/api/documents/v3alpha/documents.go
index 0c7798ab..77e42431 100644
--- a/backend/api/documents/v3alpha/documents.go
+++ b/backend/api/documents/v3alpha/documents.go
@@ -17,6 +17,7 @@ import (
 	"seed/backend/util/errutil"
 	"seed/backend/util/sqlite"
 	"seed/backend/util/sqlite/sqlitex"
+	"time"
 
 	blocks "github.com/ipfs/go-block-format"
 	"github.com/ipfs/go-cid"
@@ -26,6 +27,7 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/types/known/emptypb"
+	"google.golang.org/protobuf/types/known/timestamppb"
 )
 
 // Server implements Documents API v3.
@@ -66,7 +68,7 @@ func (srv *Server) GetDocument(ctx context.Context, in *documents.GetDocumentReq
 		return nil, err
 	}
 
-	doc, err := srv.loadDocument(ctx, ns, in.Path, docmodel.Version(in.Version), false)
+	doc, err := srv.loadDocument(ctx, ns, in.Path, docmodel.Version(in.Version), false, in.IgnoreDeleted)
 	if err != nil {
 		return nil, err
 	}
@@ -120,7 +122,7 @@ func (srv *Server) CreateDocumentChange(ctx context.Context, in *documents.Creat
 
 	ver := docmodel.Version(in.BaseVersion)
 
-	doc, err := srv.loadDocument(ctx, ns, in.Path, ver, true)
+	doc, err := srv.loadDocument(ctx, ns, in.Path, ver, true, false)
 	if err != nil {
 		return nil, err
 	}
@@ -296,7 +298,7 @@ func (srv *Server) ListDocuments(ctx context.Context, in *documents.ListDocument
 		}
 	}
 
-	out := documents.ListDocumentsResponse{
+	out := &documents.ListDocumentsResponse{
 		Documents: make([]*documents.DocumentListItem, 0, in.PageSize),
 	}
 
@@ -345,14 +347,36 @@ func (srv *Server) ListDocuments(ctx context.Context, in *documents.ListDocument
 	release()
 	for _, req := range requests {
 		doc, err := srv.GetDocument(ctx, req)
-		if err != nil {
+		switch {
+		// If we are asking about deleted only, but the Get returns OK, then it's not deleted.
+		case in.DeletedOnly && err == nil:
+			continue
+		case in.DeletedOnly && err != nil:
+			status, ok := status.FromError(err)
+			if !ok {
+				return nil, err
+			}
+			// Failed precondition error code means the doc is deleted.
+			if status.Code() == codes.FailedPrecondition {
+				req.IgnoreDeleted = true
+				doc, err = srv.GetDocument(ctx, req)
+				if err != nil {
+					srv.log.Warn("GetDocumentFailedForDeletedDocument", zap.String("space", req.Account), zap.String("path", req.Path))
+					continue
+				}
+				out.Documents = append(out.Documents, DocumentToListItem(doc))
+				continue
+			} else {
+				continue
+			}
+		case !in.DeletedOnly && err == nil:
+			out.Documents = append(out.Documents, DocumentToListItem(doc))
+		case !in.DeletedOnly && err != nil:
 			continue
 		}
-		// TODO: use indexed data instead of loading the entire document.
-		out.Documents = append(out.Documents, DocumentToListItem(doc))
 	}
 
-	return &out, nil
+	return out, nil
 }
 
 var qListDocuments = dqb.Str(`
@@ -368,7 +392,147 @@ var qListDocuments = dqb.Str(`
 
 // DeleteDocument implements Documents API v3.
 func (srv *Server) DeleteDocument(ctx context.Context, in *documents.DeleteDocumentRequest) (*emptypb.Empty, error) {
-	return nil, status.Error(codes.Unimplemented, "DeleteDocument is not implemented yet")
+	return nil, status.Error(codes.Unimplemented, "Deprecated: Use CreateRef")
+}
+
+// CreateRef implements Documents API v3.
+func (srv *Server) CreateRef(ctx context.Context, in *documents.CreateRefRequest) (*documents.Ref, error) {
+	{
+		if in.Account == "" {
+			return nil, errutil.MissingArgument("account")
+		}
+
+		if in.SigningKeyName == "" {
+			return nil, errutil.MissingArgument("signing_key_name")
+		}
+
+		if in.Target == nil {
+			return nil, errutil.MissingArgument("target")
+		}
+	}
+
+	ns, err := core.DecodePrincipal(in.Account)
+	if err != nil {
+		return nil, status.Errorf(codes.InvalidArgument, "faield to decode account ID: %v", err)
+	}
+
+	kp, err := srv.keys.GetKey(ctx, in.SigningKeyName)
+	if err != nil {
+		return nil, err
+	}
+
+	var capc cid.Cid
+	if in.Capability != "" {
+		capc, err = cid.Decode(in.Capability)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if err := srv.checkWriteAccess(ctx, ns, in.Path, kp, capc); err != nil {
+		return nil, err
+	}
+
+	if in.Path == "" {
+		return nil, status.Errorf(codes.Unimplemented, "TODO: creating Refs for root documents is not implemented yet")
+	}
+
+	var ts time.Time
+	if in.Timestamp != nil {
+		ts = in.Timestamp.AsTime().Round(blob.ClockPrecision)
+	} else {
+		ts = cclock.New().MustNow()
+	}
+
+	var refBlob blob.Encoded[*blob.Ref]
+
+	switch in.Target.Target.(type) {
+	case *documents.RefTarget_Version_:
+		return nil, status.Errorf(codes.Unimplemented, "version Ref target is not implemented yet")
+	case *documents.RefTarget_Tombstone_:
+		refBlob, err = blob.NewRefTombstone(kp, ns, in.Path, ts)
+		if err != nil {
+			return nil, err
+		}
+	case *documents.RefTarget_Redirect_:
+		return nil, status.Errorf(codes.Unimplemented, "redirect Ref target is not implemented yet")
+	default:
+		return nil, fmt.Errorf("BUG: unhandled ref target type case")
+	}
+
+	if err := srv.idx.Put(ctx, refBlob); err != nil {
+		return nil, err
+	}
+
+	return refToProto(refBlob.CID, refBlob.Decoded)
+}
+
+// GetRef implements Documents API v3.
+func (srv *Server) GetRef(ctx context.Context, in *documents.GetRefRequest) (*documents.Ref, error) {
+	if in.Id == "" {
+		return nil, errutil.MissingArgument("id")
+	}
+
+	c, err := cid.Decode(in.Id)
+	if err != nil {
+		return nil, status.Errorf(codes.InvalidArgument, "failed to parse Ref ID: %v", err)
+	}
+
+	ref, err := srv.getRef(ctx, c)
+	if err != nil {
+		return nil, err
+	}
+
+	return refToProto(ref.CID, ref.Value)
+}
+
+func refToProto(c cid.Cid, ref *blob.Ref) (*documents.Ref, error) {
+	pb := &documents.Ref{
+		Id:        c.String(),
+		Account:   ref.GetSpace().String(),
+		Path:      ref.Path,
+		Signer:    ref.Signer.String(),
+		Timestamp: timestamppb.New(ref.Ts),
+	}
+
+	switch {
+	case ref.GenesisBlob.Defined() && len(ref.Heads) > 0:
+		pb.Target = &documents.RefTarget{
+			Target: &documents.RefTarget_Version_{
+				Version: &documents.RefTarget_Version{
+					Genesis: ref.GenesisBlob.String(),
+					Version: string(blob.NewVersion(ref.Heads...)),
+				},
+			},
+		}
+	case !ref.GenesisBlob.Defined() && len(ref.Heads) == 0:
+		pb.Target = &documents.RefTarget{
+			Target: &documents.RefTarget_Tombstone_{
+				Tombstone: &documents.RefTarget_Tombstone{},
+			},
+		}
+	default:
+		return nil, fmt.Errorf("refToProto: invalid original ref %s: %+v", c, ref)
+	}
+
+	return pb, nil
+}
+
+func (srv *Server) getRef(ctx context.Context, c cid.Cid) (hb blob.WithCID[*blob.Ref], err error) {
+	blk, err := srv.idx.Get(ctx, c)
+	if err != nil {
+		return hb, err
+	}
+
+	ref := &blob.Ref{}
+	if err := cbornode.DecodeInto(blk.RawData(), ref); err != nil {
+		return hb, err
+	}
+
+	return blob.WithCID[*blob.Ref]{
+		CID:   blk.Cid(),
+		Value: ref,
+	}, nil
 }
 
 func (srv *Server) ensureProfileGenesis(ctx context.Context, kp core.KeyPair) error {
@@ -403,20 +567,38 @@ func makeIRI(account core.Principal, path string) (blob.IRI, error) {
 	return blob.NewIRI(account, path)
 }
 
-func (srv *Server) loadDocument(ctx context.Context, account core.Principal, path string, version docmodel.Version, ensurePath bool) (*docmodel.Document, error) {
+func (srv *Server) loadDocument(ctx context.Context, account core.Principal, path string, version docmodel.Version, ensurePath bool, ignoreDeleted bool) (*docmodel.Document, error) {
 	iri, err := makeIRI(account, path)
 	if err != nil {
 		return nil, err
 	}
 
+	heads, err := version.Parse()
+	if err != nil {
+		return nil, err
+	}
+
 	clock := cclock.New()
 	doc, err := docmodel.New(iri, clock)
 	if err != nil {
 		return nil, err
 	}
 
+	// We only check if it's deleted if we are asked about the latest version,
+	// unless we explicitly say to ignore deletions.
+	if version == "" && !ignoreDeleted {
+		isDeleted, err := srv.idx.IsDeleted(ctx, iri)
+		if err != nil {
+			return nil, err
+		}
+
+		if isDeleted {
+			return nil, status.Errorf(codes.FailedPrecondition, "document is marked as deleted")
+		}
+	}
+
 	var outErr error
-	changes, check := srv.idx.IterChanges(ctx, iri, account)
+	changes, check := srv.idx.IterChanges(ctx, iri)
 	for _, ch := range changes {
 		if err := doc.ApplyChange(ch.CID, ch.Data); err != nil {
 			outErr = errors.Join(outErr, err)
@@ -432,12 +614,7 @@ func (srv *Server) loadDocument(ctx context.Context, account core.Principal, pat
 		return nil, status.Errorf(codes.NotFound, "document not found: %s", iri)
 	}
 
-	if version != "" {
-		heads, err := version.Parse()
-		if err != nil {
-			return nil, err
-		}
-
+	if len(heads) > 0 {
 		doc, err = doc.Checkout(heads)
 		if err != nil {
 			return nil, fmt.Errorf("failed to checkout version: %w", err)
diff --git a/backend/api/documents/v3alpha/documents_test.go b/backend/api/documents/v3alpha/documents_test.go
index e6399866..117ed818 100644
--- a/backend/api/documents/v3alpha/documents_test.go
+++ b/backend/api/documents/v3alpha/documents_test.go
@@ -466,6 +466,137 @@ func TestCreateDocumentChangeWithTimestamp(t *testing.T) {
 	require.Error(t, err, "creating change with old timestamps must fail")
 }
 
+func TestTombstoneRef(t *testing.T) {
+	t.Parallel()
+
+	alice := newTestDocsAPI(t, "alice")
+	ctx := context.Background()
+
+	home, err := alice.CreateDocumentChange(ctx, &documents.CreateDocumentChangeRequest{
+		SigningKeyName: "main",
+		Account:        alice.me.Account.Principal().String(),
+		Path:           "",
+		Changes: []*documents.DocumentChange{
+			{Op: &documents.DocumentChange_SetMetadata_{
+				SetMetadata: &documents.DocumentChange_SetMetadata{Key: "title", Value: "Alice's profile"},
+			}},
+		},
+	})
+	require.NoError(t, err)
+
+	// Just in case testing that creating refs for home docs fails.
+	{
+		ref, err := alice.CreateRef(ctx, &documents.CreateRefRequest{
+			Account:        home.Account,
+			Path:           home.Path,
+			SigningKeyName: "main",
+			Target: &documents.RefTarget{
+				Target: &documents.RefTarget_Tombstone_{
+					Tombstone: &documents.RefTarget_Tombstone{},
+				},
+			},
+		})
+		_ = ref
+		require.Error(t, err, "creating refs for home docs must fail")
+	}
+
+	doc, err := alice.CreateDocumentChange(ctx, &documents.CreateDocumentChangeRequest{
+		SigningKeyName: "main",
+		Account:        alice.me.Account.Principal().String(),
+		Path:           "/hello",
+		Changes: []*documents.DocumentChange{
+			{Op: &documents.DocumentChange_SetMetadata_{
+				SetMetadata: &documents.DocumentChange_SetMetadata{Key: "title", Value: "Hello World"},
+			}},
+		},
+	})
+	require.NoError(t, err)
+
+	tombstone, err := alice.CreateRef(ctx, &documents.CreateRefRequest{
+		SigningKeyName: "main",
+		Account:        doc.Account,
+		Path:           doc.Path,
+		Target: &documents.RefTarget{
+			Target: &documents.RefTarget_Tombstone_{
+				Tombstone: &documents.RefTarget_Tombstone{},
+			},
+		},
+	})
+	require.NoError(t, err)
+
+	want := &documents.Ref{
+		Id:      tombstone.Id,
+		Account: "z6MkvFrq593SZ3QNsAgXdsHC2CJGrrwUdwxY2EdRGaT4UbYj",
+		Path:    "/hello",
+		Target: &documents.RefTarget{
+			Target: &documents.RefTarget_Tombstone_{
+				Tombstone: &documents.RefTarget_Tombstone{},
+			},
+		},
+		Signer:     "z6MkvFrq593SZ3QNsAgXdsHC2CJGrrwUdwxY2EdRGaT4UbYj",
+		Capability: "",
+		Timestamp:  tombstone.Timestamp,
+	}
+	testutil.StructsEqual(want, tombstone).Compare(t, "tombstone ref must match")
+	require.True(t, tombstone.Timestamp.AsTime().After(time.Now().Add(time.Hour*-1)), "ref timestamp must be set around the current time")
+
+	// Now let's check the document disappears from the Get request.
+	{
+		got, err := alice.GetDocument(ctx, &documents.GetDocumentRequest{
+			Account: tombstone.Account,
+			Path:    tombstone.Path,
+		})
+		require.Error(t, err, "getting deleted document must fail")
+		require.Nil(t, got)
+	}
+
+	// Getting previous versions should work though.
+	{
+		got, err := alice.GetDocument(ctx, &documents.GetDocumentRequest{
+			Account: doc.Account,
+			Path:    doc.Path,
+			Version: doc.Version,
+		})
+		require.NoError(t, err)
+		testutil.StructsEqual(doc, got).Compare(t, "getting doc with version must succeed even if deleted")
+	}
+
+	// We should be able to get the latest version prior to deletion.
+	{
+		got, err := alice.GetDocument(ctx, &documents.GetDocumentRequest{
+			Account:       doc.Account,
+			Path:          doc.Path,
+			Version:       "",
+			IgnoreDeleted: true,
+		})
+		require.NoError(t, err, "ignore deleted should work in Get")
+		testutil.StructsEqual(doc, got).Compare(t, "getting doc with version must succeed even if deleted")
+	}
+
+	// Deleted docs must disappear from the lists.
+	{
+		list, err := alice.ListDocuments(ctx, &documents.ListDocumentsRequest{
+			Account:  alice.me.Account.Principal().String(),
+			PageSize: 100,
+		})
+		require.NoError(t, err)
+		require.Len(t, list.Documents, 1, "only initial root document must be in the list")
+		testutil.StructsEqual(DocumentToListItem(home), list.Documents[0]).Compare(t, "listing must only show home document")
+	}
+
+	// But we also want to list the deleted docs.
+	{
+		list, err := alice.ListDocuments(ctx, &documents.ListDocumentsRequest{
+			Account:     alice.me.Account.Principal().String(),
+			PageSize:    100,
+			DeletedOnly: true,
+		})
+		require.NoError(t, err)
+		require.Len(t, list.Documents, 1, "only the deleted document must be in the list")
+		testutil.StructsEqual(DocumentToListItem(doc), list.Documents[0]).Compare(t, "listing must only show home document")
+	}
+}
+
 type testServer struct {
 	*Server
 	me coretest.Tester
diff --git a/backend/blob/blob.go b/backend/blob/blob.go
index fa8420b8..40ecba08 100644
--- a/backend/blob/blob.go
+++ b/backend/blob/blob.go
@@ -7,6 +7,7 @@ import (
 	"slices"
 	"time"
 
+	"github.com/ipfs/go-cid"
 	cbornode "github.com/ipfs/go-ipld-cbor"
 	"github.com/polydawn/refmt/obj/atlas"
 )
@@ -116,3 +117,12 @@ func verifyBlob(signer core.Principal, v any, sig *core.Signature) error {
 
 	return nil
 }
+
+// WithCID is a type for a decoded blob with its CID.
+// Because blobs are content-addressed, they don't contain their own ID,
+// so when you decode them, you somehow need to separately carry their IDs if you need to.
+// This type provides a unified way of doing this.
+type WithCID[T any] struct {
+	CID   cid.Cid
+	Value T
+}
diff --git a/backend/blob/blob_ref.go b/backend/blob/blob_ref.go
index aebefd0c..83823dcc 100644
--- a/backend/blob/blob_ref.go
+++ b/backend/blob/blob_ref.go
@@ -28,7 +28,7 @@ type Ref struct {
 
 	Space       core.Principal `refmt:"space,omitempty"`
 	Path        string         `refmt:"path,omitempty"`
-	GenesisBlob cid.Cid        `refmt:"genesisBlob"`
+	GenesisBlob cid.Cid        `refmt:"genesisBlob,omitempty"`
 	Capability  cid.Cid        `refmt:"capability,omitempty"`
 	Heads       []cid.Cid      `refmt:"heads"`
 }
@@ -57,6 +57,28 @@ func NewRef(kp core.KeyPair, genesis cid.Cid, space core.Principal, path string,
 	return encodeBlob(ru)
 }
 
+// NewRefTombstone creates a new tombstone Ref.
+func NewRefTombstone(kp core.KeyPair, space core.Principal, path string, ts time.Time) (eb Encoded[*Ref], err error) {
+	ru := &Ref{
+		baseBlob: baseBlob{
+			Type:   blobTypeRef,
+			Signer: kp.Principal(),
+			Ts:     ts,
+		},
+		Path: path,
+	}
+
+	if !kp.Principal().Equal(space) {
+		ru.Space = space
+	}
+
+	if err := signBlob(kp, ru, &ru.baseBlob.Sig); err != nil {
+		return eb, nil
+	}
+
+	return encodeBlob(ru)
+}
+
 // GetSpace returns the space the Ref is applied to.
 func (r *Ref) GetSpace() core.Principal {
 	if len(r.Space) == 0 {
@@ -92,6 +114,10 @@ func init() {
 }
 
 func indexRef(ictx *indexingCtx, id int64, c cid.Cid, v *Ref) error {
+	type Meta struct {
+		Tombstone bool `json:"tombstone,omitempty"`
+	}
+
 	// TODO(hm24): more validation and refs for docs.
 
 	iri, err := NewIRI(v.GetSpace(), v.Path)
@@ -106,8 +132,17 @@ func indexRef(ictx *indexingCtx, id int64, c cid.Cid, v *Ref) error {
 		sb = newStructuralBlob(c, string(blobTypeRef), v.Signer, v.Ts, iri, v.GenesisBlob, nil, time.Time{})
 	}
 
-	if len(v.Heads) == 0 {
-		return fmt.Errorf("ref blob must have heads")
+	switch {
+	// A normal Ref has to have Genesis and Heads.
+	case v.GenesisBlob.Defined() && len(v.Heads) > 0:
+	// A tombstone Ref must have no Genesis and no Heads.
+	case !v.GenesisBlob.Defined() && len(v.Heads) == 0:
+		sb.Meta = Meta{
+			Tombstone: true,
+		}
+	// All the other cases are invalid.
+	default:
+		return fmt.Errorf("invalid Ref blob invariants")
 	}
 
 	for _, head := range v.Heads {
diff --git a/backend/blob/index.go b/backend/blob/index.go
index c137e1dd..795b1bde 100644
--- a/backend/blob/index.go
+++ b/backend/blob/index.go
@@ -138,11 +138,19 @@ type ChangeRecord struct {
 	Data *Change
 }
 
-func (idx *Index) IterChanges(ctx context.Context, resource IRI, author core.Principal) (it iter.Seq2[int, ChangeRecord], check func() error) {
+// IterChanges iterates over changes for a given resource.
+func (idx *Index) IterChanges(ctx context.Context, resource IRI) (it iter.Seq2[int, ChangeRecord], check func() error) {
 	var outErr error
 
 	check = func() error { return outErr }
+
 	it = func(yield func(int, ChangeRecord) bool) {
+		space, _, err := resource.SpacePath()
+		if err != nil {
+			outErr = err
+			return
+		}
+
 		conn, release, err := idx.db.Conn(ctx)
 		if err != nil {
 			outErr = err
@@ -151,7 +159,7 @@ func (idx *Index) IterChanges(ctx context.Context, resource IRI, author core.Pri
 		defer release()
 
 		buf := make([]byte, 0, 1024*1024) // preallocating 1MB for decompression.
-		rows, check := sqlitex.Query(conn, qIterChanges(), resource, author, author, resource)
+		rows, check := sqlitex.Query(conn, qIterChanges(), resource, space, space, resource)
 		var i int
 		for row := range rows {
 			next := sqlite.NewIncrementor(0)
@@ -234,6 +242,48 @@ var qIterChanges = dqb.Str(`
 	ORDER BY sb.ts
 `)
 
+// IsDeleted checks whether a given resource is deleted.
+func (idx *Index) IsDeleted(ctx context.Context, resource IRI) (deleted bool, err error) {
+	conn, release, err := idx.db.Conn(ctx)
+	if err != nil {
+		return false, err
+	}
+	defer release()
+
+	space, _, err := resource.SpacePath()
+	if err != nil {
+		return false, err
+	}
+
+	rows, check := sqlitex.Query(conn, qIsDeleted(), resource, space, space, resource)
+	for row := range rows {
+		deleted = row.ColumnInt(0) == 1
+	}
+	if err := check(); err != nil {
+		return false, err
+	}
+
+	return deleted, nil
+}
+
+var qIsDeleted = dqb.Str(`
+	SELECT
+		COALESCE(extra_attrs->>'tombstone', 0) AS is_deleted
+	FROM structural_blobs
+	WHERE type = 'Ref'
+	AND resource = (SELECT id FROM resources WHERE iri = :iri)
+	AND (author = (SELECT id FROM public_keys WHERE principal = :space) OR author IN (
+		SELECT DISTINCT extra_attrs->>'del'
+		FROM structural_blobs
+		WHERE type = 'Capability'
+		AND author = (SELECT id FROM public_keys WHERE principal = :space2)
+		AND resource IN (SELECT id FROM resources WHERE :iri2 BETWEEN iri AND iri || '~~~~~~')
+	))
+	GROUP BY resource
+	HAVING ts = MAX(ts)
+	LIMIT 1
+`)
+
 func (idx *Index) WalkCapabilities(ctx context.Context, resource IRI, author core.Principal, fn func(cid.Cid, *Capability) error) error {
 	conn, release, err := idx.db.Conn(ctx)
 	if err != nil {
@@ -300,7 +350,7 @@ func (idx *Index) IterComments(ctx context.Context, resource IRI) (it iter.Seq2[
 		defer release()
 
 		buf := make([]byte, 0, 1024*1024) // preallocating 1MB for decompression.
-		rows, check := sqlitex.Query(conn, qWalkComments(), resource)
+		rows, check := sqlitex.Query(conn, qIterComments(), resource)
 		for row := range rows {
 			var (
 				codec = row.ColumnInt64(0)
@@ -334,47 +384,7 @@ func (idx *Index) IterComments(ctx context.Context, resource IRI) (it iter.Seq2[
 	return it, check
 }
 
-func (idx *Index) WalkComments(ctx context.Context, resource IRI, fn func(cid.Cid, *Comment) error) error {
-	conn, release, err := idx.db.Conn(ctx)
-	if err != nil {
-		return err
-	}
-	defer release()
-
-	buf := make([]byte, 0, 1024*1024) // preallocating 1MB for decompression.
-	if err := sqlitex.Exec(conn, qWalkComments(), func(stmt *sqlite.Stmt) error {
-		var (
-			codec = stmt.ColumnInt64(0)
-			hash  = stmt.ColumnBytesUnsafe(1)
-			data  = stmt.ColumnBytesUnsafe(2)
-		)
-
-		buf, err = idx.bs.decoder.DecodeAll(data, buf)
-		if err != nil {
-			return err
-		}
-
-		chcid := cid.NewCidV1(uint64(codec), hash)
-		cmt := &Comment{}
-		if err := cbornode.DecodeInto(buf, cmt); err != nil {
-			return fmt.Errorf("WalkChanges: failed to decode change %s for entity %s: %w", chcid, resource, err)
-		}
-
-		if err := fn(chcid, cmt); err != nil {
-			return err
-		}
-
-		buf = buf[:0] // reset the slice reusing the backing array
-
-		return nil
-	}, resource); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-var qWalkComments = dqb.Str(`
+var qIterComments = dqb.Str(`
 	SELECT
 		b.codec,
 		b.multihash,
diff --git a/backend/genproto/documents/v3alpha/documents.pb.go b/backend/genproto/documents/v3alpha/documents.pb.go
index 8ab94d1e..13d6585b 100644
--- a/backend/genproto/documents/v3alpha/documents.pb.go
+++ b/backend/genproto/documents/v3alpha/documents.pb.go
@@ -34,7 +34,12 @@ type GetDocumentRequest struct {
 	// Empty string means root document.
 	Path string `protobuf:"bytes,2,opt,name=path,proto3" json:"path,omitempty"`
 	// Optional. Exact version of the document to retrieve.
+	// Empty version means "latest".
 	Version string `protobuf:"bytes,3,opt,name=version,proto3" json:"version,omitempty"`
+	// Optional. Only applicable when requesting the latest version
+	// (i.e. when version field is empty).
+	// When this flag is set, the server will return the latest version known prior to deletion.
+	IgnoreDeleted bool `protobuf:"varint,4,opt,name=ignore_deleted,json=ignoreDeleted,proto3" json:"ignore_deleted,omitempty"`
 }
 
 func (x *GetDocumentRequest) Reset() {
@@ -90,6 +95,13 @@ func (x *GetDocumentRequest) GetVersion() string {
 	return ""
 }
 
+func (x *GetDocumentRequest) GetIgnoreDeleted() bool {
+	if x != nil {
+		return x.IgnoreDeleted
+	}
+	return false
+}
+
 // Request to create a new document change.
 type CreateDocumentChangeRequest struct {
 	state         protoimpl.MessageState
@@ -383,8 +395,10 @@ type ListDocumentsRequest struct {
 	Account string `protobuf:"bytes,1,opt,name=account,proto3" json:"account,omitempty"`
 	// Optional. Number of results per page. Default is defined by the server.
 	PageSize int32 `protobuf:"varint,2,opt,name=page_size,json=pageSize,proto3" json:"page_size,omitempty"`
+	// Optional. Only list documents for those paths that are deleted.
+	DeletedOnly bool `protobuf:"varint,3,opt,name=deleted_only,json=deletedOnly,proto3" json:"deleted_only,omitempty"`
 	// Optional. Value from next_page_token obtained from a previous response.
-	PageToken string `protobuf:"bytes,3,opt,name=page_token,json=pageToken,proto3" json:"page_token,omitempty"`
+	PageToken string `protobuf:"bytes,4,opt,name=page_token,json=pageToken,proto3" json:"page_token,omitempty"`
 }
 
 func (x *ListDocumentsRequest) Reset() {
@@ -433,6 +447,13 @@ func (x *ListDocumentsRequest) GetPageSize() int32 {
 	return 0
 }
 
+func (x *ListDocumentsRequest) GetDeletedOnly() bool {
+	if x != nil {
+		return x.DeletedOnly
+	}
+	return false
+}
+
 func (x *ListDocumentsRequest) GetPageToken() string {
 	if x != nil {
 		return x.PageToken
@@ -641,6 +662,154 @@ func (x *ListDocumentChangesResponse) GetNextPageToken() string {
 	return ""
 }
 
+// Request to create a Ref.
+type CreateRefRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Required. The ID of the account/space in which to create the Ref.
+	Account string `protobuf:"bytes,1,opt,name=account,proto3" json:"account,omitempty"`
+	// Required. Path of the new Ref.
+	// Empty string means root document.
+	Path string `protobuf:"bytes,2,opt,name=path,proto3" json:"path,omitempty"`
+	// Required. Target for the new Ref.
+	Target *RefTarget `protobuf:"bytes,3,opt,name=target,proto3" json:"target,omitempty"`
+	// Required. Name of the signing key to use for signing the Ref.
+	SigningKeyName string `protobuf:"bytes,4,opt,name=signing_key_name,json=signingKeyName,proto3" json:"signing_key_name,omitempty"`
+	// Optional. ID of the Capability blob that grants the necessary rights to the signin key
+	// to write Refs for the requested account + path.
+	Capability string `protobuf:"bytes,5,opt,name=capability,proto3" json:"capability,omitempty"`
+	// Optional. A timestamp of the Ref blob.
+	// If not specified the server will use the current time.
+	// The provided timestamp will be rounded to the nearest millisecond,
+	// so the final timestamp in the resulting Ref blob may not be exactly as provided.
+	Timestamp *timestamppb.Timestamp `protobuf:"bytes,6,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+}
+
+func (x *CreateRefRequest) Reset() {
+	*x = CreateRefRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[9]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *CreateRefRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CreateRefRequest) ProtoMessage() {}
+
+func (x *CreateRefRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[9]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CreateRefRequest.ProtoReflect.Descriptor instead.
+func (*CreateRefRequest) Descriptor() ([]byte, []int) {
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{9}
+}
+
+func (x *CreateRefRequest) GetAccount() string {
+	if x != nil {
+		return x.Account
+	}
+	return ""
+}
+
+func (x *CreateRefRequest) GetPath() string {
+	if x != nil {
+		return x.Path
+	}
+	return ""
+}
+
+func (x *CreateRefRequest) GetTarget() *RefTarget {
+	if x != nil {
+		return x.Target
+	}
+	return nil
+}
+
+func (x *CreateRefRequest) GetSigningKeyName() string {
+	if x != nil {
+		return x.SigningKeyName
+	}
+	return ""
+}
+
+func (x *CreateRefRequest) GetCapability() string {
+	if x != nil {
+		return x.Capability
+	}
+	return ""
+}
+
+func (x *CreateRefRequest) GetTimestamp() *timestamppb.Timestamp {
+	if x != nil {
+		return x.Timestamp
+	}
+	return nil
+}
+
+// Request to get a Ref by ID.
+type GetRefRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Required. ID of the Ref blob to retrieve.
+	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+}
+
+func (x *GetRefRequest) Reset() {
+	*x = GetRefRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[10]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetRefRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetRefRequest) ProtoMessage() {}
+
+func (x *GetRefRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[10]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetRefRequest.ProtoReflect.Descriptor instead.
+func (*GetRefRequest) Descriptor() ([]byte, []int) {
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{10}
+}
+
+func (x *GetRefRequest) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
 // Information about a particular document version.
 type DocumentChangeInfo struct {
 	state         protoimpl.MessageState
@@ -660,7 +829,7 @@ type DocumentChangeInfo struct {
 func (x *DocumentChangeInfo) Reset() {
 	*x = DocumentChangeInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_documents_v3alpha_documents_proto_msgTypes[9]
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -673,7 +842,7 @@ func (x *DocumentChangeInfo) String() string {
 func (*DocumentChangeInfo) ProtoMessage() {}
 
 func (x *DocumentChangeInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_documents_v3alpha_documents_proto_msgTypes[9]
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -686,7 +855,7 @@ func (x *DocumentChangeInfo) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DocumentChangeInfo.ProtoReflect.Descriptor instead.
 func (*DocumentChangeInfo) Descriptor() ([]byte, []int) {
-	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{9}
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *DocumentChangeInfo) GetId() string {
@@ -746,7 +915,7 @@ type DocumentListItem struct {
 func (x *DocumentListItem) Reset() {
 	*x = DocumentListItem{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_documents_v3alpha_documents_proto_msgTypes[10]
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -759,7 +928,7 @@ func (x *DocumentListItem) String() string {
 func (*DocumentListItem) ProtoMessage() {}
 
 func (x *DocumentListItem) ProtoReflect() protoreflect.Message {
-	mi := &file_documents_v3alpha_documents_proto_msgTypes[10]
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -772,7 +941,7 @@ func (x *DocumentListItem) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DocumentListItem.ProtoReflect.Descriptor instead.
 func (*DocumentListItem) Descriptor() ([]byte, []int) {
-	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{10}
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{12}
 }
 
 func (x *DocumentListItem) GetAccount() string {
@@ -862,7 +1031,7 @@ type Document struct {
 func (x *Document) Reset() {
 	*x = Document{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_documents_v3alpha_documents_proto_msgTypes[11]
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -875,7 +1044,7 @@ func (x *Document) String() string {
 func (*Document) ProtoMessage() {}
 
 func (x *Document) ProtoReflect() protoreflect.Message {
-	mi := &file_documents_v3alpha_documents_proto_msgTypes[11]
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -888,7 +1057,7 @@ func (x *Document) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Document.ProtoReflect.Descriptor instead.
 func (*Document) Descriptor() ([]byte, []int) {
-	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{11}
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{13}
 }
 
 func (x *Document) GetAccount() string {
@@ -969,7 +1138,7 @@ type BlockNode struct {
 func (x *BlockNode) Reset() {
 	*x = BlockNode{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_documents_v3alpha_documents_proto_msgTypes[12]
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -982,7 +1151,7 @@ func (x *BlockNode) String() string {
 func (*BlockNode) ProtoMessage() {}
 
 func (x *BlockNode) ProtoReflect() protoreflect.Message {
-	mi := &file_documents_v3alpha_documents_proto_msgTypes[12]
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -995,7 +1164,7 @@ func (x *BlockNode) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use BlockNode.ProtoReflect.Descriptor instead.
 func (*BlockNode) Descriptor() ([]byte, []int) {
-	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{12}
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{14}
 }
 
 func (x *BlockNode) GetBlock() *Block {
@@ -1039,7 +1208,7 @@ type Block struct {
 func (x *Block) Reset() {
 	*x = Block{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_documents_v3alpha_documents_proto_msgTypes[13]
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1052,7 +1221,7 @@ func (x *Block) String() string {
 func (*Block) ProtoMessage() {}
 
 func (x *Block) ProtoReflect() protoreflect.Message {
-	mi := &file_documents_v3alpha_documents_proto_msgTypes[13]
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1065,7 +1234,7 @@ func (x *Block) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Block.ProtoReflect.Descriptor instead.
 func (*Block) Descriptor() ([]byte, []int) {
-	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{13}
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{15}
 }
 
 func (x *Block) GetId() string {
@@ -1148,7 +1317,7 @@ type Annotation struct {
 func (x *Annotation) Reset() {
 	*x = Annotation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_documents_v3alpha_documents_proto_msgTypes[14]
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1161,7 +1330,7 @@ func (x *Annotation) String() string {
 func (*Annotation) ProtoMessage() {}
 
 func (x *Annotation) ProtoReflect() protoreflect.Message {
-	mi := &file_documents_v3alpha_documents_proto_msgTypes[14]
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[16]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1174,7 +1343,7 @@ func (x *Annotation) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Annotation.ProtoReflect.Descriptor instead.
 func (*Annotation) Descriptor() ([]byte, []int) {
-	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{14}
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{16}
 }
 
 func (x *Annotation) GetType() string {
@@ -1230,7 +1399,7 @@ type DocumentChange struct {
 func (x *DocumentChange) Reset() {
 	*x = DocumentChange{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_documents_v3alpha_documents_proto_msgTypes[15]
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1243,7 +1412,7 @@ func (x *DocumentChange) String() string {
 func (*DocumentChange) ProtoMessage() {}
 
 func (x *DocumentChange) ProtoReflect() protoreflect.Message {
-	mi := &file_documents_v3alpha_documents_proto_msgTypes[15]
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1256,7 +1425,7 @@ func (x *DocumentChange) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use DocumentChange.ProtoReflect.Descriptor instead.
 func (*DocumentChange) Descriptor() ([]byte, []int) {
-	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{15}
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{17}
 }
 
 func (m *DocumentChange) GetOp() isDocumentChange_Op {
@@ -1326,39 +1495,45 @@ func (*DocumentChange_ReplaceBlock) isDocumentChange_Op() {}
 
 func (*DocumentChange_DeleteBlock) isDocumentChange_Op() {}
 
-// Operation to move an existing block to a different place in the document.
-// Move and Create operations are both expressed with this.
-// Conceptually new blocks are moved out of nowhere into the document.
-type DocumentChange_MoveBlock struct {
+// Description of a Ref blob.
+type Ref struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// ID of the block to move.
-	BlockId string `protobuf:"bytes,1,opt,name=block_id,json=blockId,proto3" json:"block_id,omitempty"`
-	// ID of the new parent for the block being moved.
-	Parent string `protobuf:"bytes,2,opt,name=parent,proto3" json:"parent,omitempty"`
-	// ID of the new left sibling for the block being moved.
-	LeftSibling string `protobuf:"bytes,3,opt,name=left_sibling,json=leftSibling,proto3" json:"left_sibling,omitempty"`
+	// CID of the Ref blob.
+	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	// Account (space) in which the Ref blob exists.
+	Account string `protobuf:"bytes,2,opt,name=account,proto3" json:"account,omitempty"`
+	// Path in the account Ref creates an entry for.
+	Path string `protobuf:"bytes,3,opt,name=path,proto3" json:"path,omitempty"`
+	// Description of where the Ref points to.
+	Target *RefTarget `protobuf:"bytes,4,opt,name=target,proto3" json:"target,omitempty"`
+	// Public key used to sign the Ref blob.
+	Signer string `protobuf:"bytes,5,opt,name=signer,proto3" json:"signer,omitempty"`
+	// Optional. ID of the Capability attached to this Ref.
+	Capability string `protobuf:"bytes,6,opt,name=capability,proto3" json:"capability,omitempty"`
+	// Timestamp of the Ref.
+	Timestamp *timestamppb.Timestamp `protobuf:"bytes,7,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
 }
 
-func (x *DocumentChange_MoveBlock) Reset() {
-	*x = DocumentChange_MoveBlock{}
+func (x *Ref) Reset() {
+	*x = Ref{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_documents_v3alpha_documents_proto_msgTypes[20]
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[18]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *DocumentChange_MoveBlock) String() string {
+func (x *Ref) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*DocumentChange_MoveBlock) ProtoMessage() {}
+func (*Ref) ProtoMessage() {}
 
-func (x *DocumentChange_MoveBlock) ProtoReflect() protoreflect.Message {
-	mi := &file_documents_v3alpha_documents_proto_msgTypes[20]
+func (x *Ref) ProtoReflect() protoreflect.Message {
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[18]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1369,61 +1544,93 @@ func (x *DocumentChange_MoveBlock) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use DocumentChange_MoveBlock.ProtoReflect.Descriptor instead.
-func (*DocumentChange_MoveBlock) Descriptor() ([]byte, []int) {
-	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{15, 0}
+// Deprecated: Use Ref.ProtoReflect.Descriptor instead.
+func (*Ref) Descriptor() ([]byte, []int) {
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{18}
 }
 
-func (x *DocumentChange_MoveBlock) GetBlockId() string {
+func (x *Ref) GetId() string {
 	if x != nil {
-		return x.BlockId
+		return x.Id
 	}
 	return ""
 }
 
-func (x *DocumentChange_MoveBlock) GetParent() string {
+func (x *Ref) GetAccount() string {
 	if x != nil {
-		return x.Parent
+		return x.Account
 	}
 	return ""
 }
 
-func (x *DocumentChange_MoveBlock) GetLeftSibling() string {
+func (x *Ref) GetPath() string {
 	if x != nil {
-		return x.LeftSibling
+		return x.Path
 	}
 	return ""
 }
 
-// Operation to replace a metadata field with a new value
-type DocumentChange_SetMetadata struct {
+func (x *Ref) GetTarget() *RefTarget {
+	if x != nil {
+		return x.Target
+	}
+	return nil
+}
+
+func (x *Ref) GetSigner() string {
+	if x != nil {
+		return x.Signer
+	}
+	return ""
+}
+
+func (x *Ref) GetCapability() string {
+	if x != nil {
+		return x.Capability
+	}
+	return ""
+}
+
+func (x *Ref) GetTimestamp() *timestamppb.Timestamp {
+	if x != nil {
+		return x.Timestamp
+	}
+	return nil
+}
+
+// Description of where the Ref points to.
+type RefTarget struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// Metadata key to set.
-	Key string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
-	// Metadata value to set.
-	Value string `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+	// A Ref can point to one of the following targets.
+	//
+	// Types that are assignable to Target:
+	//
+	//	*RefTarget_Version_
+	//	*RefTarget_Redirect_
+	//	*RefTarget_Tombstone_
+	Target isRefTarget_Target `protobuf_oneof:"target"`
 }
 
-func (x *DocumentChange_SetMetadata) Reset() {
-	*x = DocumentChange_SetMetadata{}
+func (x *RefTarget) Reset() {
+	*x = RefTarget{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_documents_v3alpha_documents_proto_msgTypes[21]
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[19]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *DocumentChange_SetMetadata) String() string {
+func (x *RefTarget) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*DocumentChange_SetMetadata) ProtoMessage() {}
+func (*RefTarget) ProtoMessage() {}
 
-func (x *DocumentChange_SetMetadata) ProtoReflect() protoreflect.Message {
-	mi := &file_documents_v3alpha_documents_proto_msgTypes[21]
+func (x *RefTarget) ProtoReflect() protoreflect.Message {
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[19]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1434,303 +1641,705 @@ func (x *DocumentChange_SetMetadata) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use DocumentChange_SetMetadata.ProtoReflect.Descriptor instead.
-func (*DocumentChange_SetMetadata) Descriptor() ([]byte, []int) {
-	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{15, 1}
+// Deprecated: Use RefTarget.ProtoReflect.Descriptor instead.
+func (*RefTarget) Descriptor() ([]byte, []int) {
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{19}
 }
 
-func (x *DocumentChange_SetMetadata) GetKey() string {
-	if x != nil {
-		return x.Key
+func (m *RefTarget) GetTarget() isRefTarget_Target {
+	if m != nil {
+		return m.Target
 	}
-	return ""
+	return nil
 }
 
-func (x *DocumentChange_SetMetadata) GetValue() string {
-	if x != nil {
-		return x.Value
+func (x *RefTarget) GetVersion() *RefTarget_Version {
+	if x, ok := x.GetTarget().(*RefTarget_Version_); ok {
+		return x.Version
 	}
-	return ""
+	return nil
 }
 
-var File_documents_v3alpha_documents_proto protoreflect.FileDescriptor
+func (x *RefTarget) GetRedirect() *RefTarget_Redirect {
+	if x, ok := x.GetTarget().(*RefTarget_Redirect_); ok {
+		return x.Redirect
+	}
+	return nil
+}
 
-var file_documents_v3alpha_documents_proto_rawDesc = []byte{
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+func (x *RefTarget) GetTombstone() *RefTarget_Tombstone {
+	if x, ok := x.GetTarget().(*RefTarget_Tombstone_); ok {
+		return x.Tombstone
+	}
+	return nil
+}
+
+type isRefTarget_Target interface {
+	isRefTarget_Target()
+}
+
+type RefTarget_Version_ struct {
+	// Version target describes genesis + head changes (version).
+	Version *RefTarget_Version `protobuf:"bytes,1,opt,name=version,proto3,oneof"`
+}
+
+type RefTarget_Redirect_ struct {
+	// Redirect target makes a Ref point to a different account + path.
+	// Users must be careful to not create cycles or very deep redirect chains.
+	// Client should be careful not to get stuck in redirects
+	// by tracking visited paths to prevent cycles,
+	// and by limiting the depth of the redirect chains,
+	// while handling redirects.
+	Redirect *RefTarget_Redirect `protobuf:"bytes,2,opt,name=redirect,proto3,oneof"`
+}
+
+type RefTarget_Tombstone_ struct {
+	// Tombstone Ref indicates the intent to delete the given account + path.
+	Tombstone *RefTarget_Tombstone `protobuf:"bytes,3,opt,name=tombstone,proto3,oneof"`
+}
+
+func (*RefTarget_Version_) isRefTarget_Target() {}
+
+func (*RefTarget_Redirect_) isRefTarget_Target() {}
+
+func (*RefTarget_Tombstone_) isRefTarget_Target() {}
+
+// Operation to move an existing block to a different place in the document.
+// Move and Create operations are both expressed with this.
+// Conceptually new blocks are moved out of nowhere into the document.
+type DocumentChange_MoveBlock struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// ID of the block to move.
+	BlockId string `protobuf:"bytes,1,opt,name=block_id,json=blockId,proto3" json:"block_id,omitempty"`
+	// ID of the new parent for the block being moved.
+	Parent string `protobuf:"bytes,2,opt,name=parent,proto3" json:"parent,omitempty"`
+	// ID of the new left sibling for the block being moved.
+	LeftSibling string `protobuf:"bytes,3,opt,name=left_sibling,json=leftSibling,proto3" json:"left_sibling,omitempty"`
+}
+
+func (x *DocumentChange_MoveBlock) Reset() {
+	*x = DocumentChange_MoveBlock{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[24]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *DocumentChange_MoveBlock) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DocumentChange_MoveBlock) ProtoMessage() {}
+
+func (x *DocumentChange_MoveBlock) ProtoReflect() protoreflect.Message {
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[24]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DocumentChange_MoveBlock.ProtoReflect.Descriptor instead.
+func (*DocumentChange_MoveBlock) Descriptor() ([]byte, []int) {
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{17, 0}
+}
+
+func (x *DocumentChange_MoveBlock) GetBlockId() string {
+	if x != nil {
+		return x.BlockId
+	}
+	return ""
+}
+
+func (x *DocumentChange_MoveBlock) GetParent() string {
+	if x != nil {
+		return x.Parent
+	}
+	return ""
+}
+
+func (x *DocumentChange_MoveBlock) GetLeftSibling() string {
+	if x != nil {
+		return x.LeftSibling
+	}
+	return ""
+}
+
+// Operation to replace a metadata field with a new value
+type DocumentChange_SetMetadata struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Metadata key to set.
+	Key string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	// Metadata value to set.
+	Value string `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+}
+
+func (x *DocumentChange_SetMetadata) Reset() {
+	*x = DocumentChange_SetMetadata{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[25]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *DocumentChange_SetMetadata) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DocumentChange_SetMetadata) ProtoMessage() {}
+
+func (x *DocumentChange_SetMetadata) ProtoReflect() protoreflect.Message {
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[25]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use DocumentChange_SetMetadata.ProtoReflect.Descriptor instead.
+func (*DocumentChange_SetMetadata) Descriptor() ([]byte, []int) {
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{17, 1}
+}
+
+func (x *DocumentChange_SetMetadata) GetKey() string {
+	if x != nil {
+		return x.Key
+	}
+	return ""
+}
+
+func (x *DocumentChange_SetMetadata) GetValue() string {
+	if x != nil {
+		return x.Value
+	}
+	return ""
+}
+
+type RefTarget_Version struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Required. ID of the genesis Change.
+	Genesis string `protobuf:"bytes,1,opt,name=genesis,proto3" json:"genesis,omitempty"`
+	// Required. Version ID (possibly compount).
+	// Each change in the version ID must have the same genesis.
+	Version string `protobuf:"bytes,2,opt,name=version,proto3" json:"version,omitempty"`
+}
+
+func (x *RefTarget_Version) Reset() {
+	*x = RefTarget_Version{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[26]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RefTarget_Version) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RefTarget_Version) ProtoMessage() {}
+
+func (x *RefTarget_Version) ProtoReflect() protoreflect.Message {
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[26]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RefTarget_Version.ProtoReflect.Descriptor instead.
+func (*RefTarget_Version) Descriptor() ([]byte, []int) {
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{19, 0}
+}
+
+func (x *RefTarget_Version) GetGenesis() string {
+	if x != nil {
+		return x.Genesis
+	}
+	return ""
+}
+
+func (x *RefTarget_Version) GetVersion() string {
+	if x != nil {
+		return x.Version
+	}
+	return ""
+}
+
+type RefTarget_Redirect struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Required. Account ID to which the Ref should redirect.
+	// Can be the same as the account in the Ref itself,
+	// when we redirect to a different path in the same account/space.
+	Account string `protobuf:"bytes,1,opt,name=account,proto3" json:"account,omitempty"`
+	// Required. Path to which the Ref should redirect.
+	// Empty string means root document.
+	// Must not be the same as the Ref itself.
+	Path string `protobuf:"bytes,2,opt,name=path,proto3" json:"path,omitempty"`
+}
+
+func (x *RefTarget_Redirect) Reset() {
+	*x = RefTarget_Redirect{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[27]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RefTarget_Redirect) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RefTarget_Redirect) ProtoMessage() {}
+
+func (x *RefTarget_Redirect) ProtoReflect() protoreflect.Message {
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[27]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RefTarget_Redirect.ProtoReflect.Descriptor instead.
+func (*RefTarget_Redirect) Descriptor() ([]byte, []int) {
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{19, 1}
+}
+
+func (x *RefTarget_Redirect) GetAccount() string {
+	if x != nil {
+		return x.Account
+	}
+	return ""
+}
+
+func (x *RefTarget_Redirect) GetPath() string {
+	if x != nil {
+		return x.Path
+	}
+	return ""
+}
+
+type RefTarget_Tombstone struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *RefTarget_Tombstone) Reset() {
+	*x = RefTarget_Tombstone{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_documents_v3alpha_documents_proto_msgTypes[28]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RefTarget_Tombstone) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RefTarget_Tombstone) ProtoMessage() {}
+
+func (x *RefTarget_Tombstone) ProtoReflect() protoreflect.Message {
+	mi := &file_documents_v3alpha_documents_proto_msgTypes[28]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RefTarget_Tombstone.ProtoReflect.Descriptor instead.
+func (*RefTarget_Tombstone) Descriptor() ([]byte, []int) {
+	return file_documents_v3alpha_documents_proto_rawDescGZIP(), []int{19, 2}
+}
+
+var File_documents_v3alpha_documents_proto protoreflect.FileDescriptor
+
+var file_documents_v3alpha_documents_proto_rawDesc = []byte{
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 }
 
 var (
@@ -1745,7 +2354,7 @@ func file_documents_v3alpha_documents_proto_rawDescGZIP() []byte {
 	return file_documents_v3alpha_documents_proto_rawDescData
 }
 
-var file_documents_v3alpha_documents_proto_msgTypes = make([]protoimpl.MessageInfo, 22)
+var file_documents_v3alpha_documents_proto_msgTypes = make([]protoimpl.MessageInfo, 29)
 var file_documents_v3alpha_documents_proto_goTypes = []any{
 	(*GetDocumentRequest)(nil),          // 0: com.seed.documents.v3alpha.GetDocumentRequest
 	(*CreateDocumentChangeRequest)(nil), // 1: com.seed.documents.v3alpha.CreateDocumentChangeRequest
@@ -1756,61 +2365,79 @@ var file_documents_v3alpha_documents_proto_goTypes = []any{
 	(*ListDocumentsResponse)(nil),       // 6: com.seed.documents.v3alpha.ListDocumentsResponse
 	(*ListDocumentChangesRequest)(nil),  // 7: com.seed.documents.v3alpha.ListDocumentChangesRequest
 	(*ListDocumentChangesResponse)(nil), // 8: com.seed.documents.v3alpha.ListDocumentChangesResponse
-	(*DocumentChangeInfo)(nil),          // 9: com.seed.documents.v3alpha.DocumentChangeInfo
-	(*DocumentListItem)(nil),            // 10: com.seed.documents.v3alpha.DocumentListItem
-	(*Document)(nil),                    // 11: com.seed.documents.v3alpha.Document
-	(*BlockNode)(nil),                   // 12: com.seed.documents.v3alpha.BlockNode
-	(*Block)(nil),                       // 13: com.seed.documents.v3alpha.Block
-	(*Annotation)(nil),                  // 14: com.seed.documents.v3alpha.Annotation
-	(*DocumentChange)(nil),              // 15: com.seed.documents.v3alpha.DocumentChange
-	nil,                                 // 16: com.seed.documents.v3alpha.DocumentListItem.MetadataEntry
-	nil,                                 // 17: com.seed.documents.v3alpha.Document.MetadataEntry
-	nil,                                 // 18: com.seed.documents.v3alpha.Block.AttributesEntry
-	nil,                                 // 19: com.seed.documents.v3alpha.Annotation.AttributesEntry
-	(*DocumentChange_MoveBlock)(nil),    // 20: com.seed.documents.v3alpha.DocumentChange.MoveBlock
-	(*DocumentChange_SetMetadata)(nil),  // 21: com.seed.documents.v3alpha.DocumentChange.SetMetadata
-	(*timestamppb.Timestamp)(nil),       // 22: google.protobuf.Timestamp
-	(*emptypb.Empty)(nil),               // 23: google.protobuf.Empty
+	(*CreateRefRequest)(nil),            // 9: com.seed.documents.v3alpha.CreateRefRequest
+	(*GetRefRequest)(nil),               // 10: com.seed.documents.v3alpha.GetRefRequest
+	(*DocumentChangeInfo)(nil),          // 11: com.seed.documents.v3alpha.DocumentChangeInfo
+	(*DocumentListItem)(nil),            // 12: com.seed.documents.v3alpha.DocumentListItem
+	(*Document)(nil),                    // 13: com.seed.documents.v3alpha.Document
+	(*BlockNode)(nil),                   // 14: com.seed.documents.v3alpha.BlockNode
+	(*Block)(nil),                       // 15: com.seed.documents.v3alpha.Block
+	(*Annotation)(nil),                  // 16: com.seed.documents.v3alpha.Annotation
+	(*DocumentChange)(nil),              // 17: com.seed.documents.v3alpha.DocumentChange
+	(*Ref)(nil),                         // 18: com.seed.documents.v3alpha.Ref
+	(*RefTarget)(nil),                   // 19: com.seed.documents.v3alpha.RefTarget
+	nil,                                 // 20: com.seed.documents.v3alpha.DocumentListItem.MetadataEntry
+	nil,                                 // 21: com.seed.documents.v3alpha.Document.MetadataEntry
+	nil,                                 // 22: com.seed.documents.v3alpha.Block.AttributesEntry
+	nil,                                 // 23: com.seed.documents.v3alpha.Annotation.AttributesEntry
+	(*DocumentChange_MoveBlock)(nil),    // 24: com.seed.documents.v3alpha.DocumentChange.MoveBlock
+	(*DocumentChange_SetMetadata)(nil),  // 25: com.seed.documents.v3alpha.DocumentChange.SetMetadata
+	(*RefTarget_Version)(nil),           // 26: com.seed.documents.v3alpha.RefTarget.Version
+	(*RefTarget_Redirect)(nil),          // 27: com.seed.documents.v3alpha.RefTarget.Redirect
+	(*RefTarget_Tombstone)(nil),         // 28: com.seed.documents.v3alpha.RefTarget.Tombstone
+	(*timestamppb.Timestamp)(nil),       // 29: google.protobuf.Timestamp
+	(*emptypb.Empty)(nil),               // 30: google.protobuf.Empty
 }
 var file_documents_v3alpha_documents_proto_depIdxs = []int32{
-	15, // 0: com.seed.documents.v3alpha.CreateDocumentChangeRequest.changes:type_name -> com.seed.documents.v3alpha.DocumentChange
-	22, // 1: com.seed.documents.v3alpha.CreateDocumentChangeRequest.timestamp:type_name -> google.protobuf.Timestamp
-	10, // 2: com.seed.documents.v3alpha.ListRootDocumentsResponse.documents:type_name -> com.seed.documents.v3alpha.DocumentListItem
-	10, // 3: com.seed.documents.v3alpha.ListDocumentsResponse.documents:type_name -> com.seed.documents.v3alpha.DocumentListItem
-	9,  // 4: com.seed.documents.v3alpha.ListDocumentChangesResponse.changes:type_name -> com.seed.documents.v3alpha.DocumentChangeInfo
-	22, // 5: com.seed.documents.v3alpha.DocumentChangeInfo.create_time:type_name -> google.protobuf.Timestamp
-	16, // 6: com.seed.documents.v3alpha.DocumentListItem.metadata:type_name -> com.seed.documents.v3alpha.DocumentListItem.MetadataEntry
-	22, // 7: com.seed.documents.v3alpha.DocumentListItem.create_time:type_name -> google.protobuf.Timestamp
-	22, // 8: com.seed.documents.v3alpha.DocumentListItem.update_time:type_name -> google.protobuf.Timestamp
-	17, // 9: com.seed.documents.v3alpha.Document.metadata:type_name -> com.seed.documents.v3alpha.Document.MetadataEntry
-	12, // 10: com.seed.documents.v3alpha.Document.content:type_name -> com.seed.documents.v3alpha.BlockNode
-	22, // 11: com.seed.documents.v3alpha.Document.create_time:type_name -> google.protobuf.Timestamp
-	22, // 12: com.seed.documents.v3alpha.Document.update_time:type_name -> google.protobuf.Timestamp
-	13, // 13: com.seed.documents.v3alpha.BlockNode.block:type_name -> com.seed.documents.v3alpha.Block
-	12, // 14: com.seed.documents.v3alpha.BlockNode.children:type_name -> com.seed.documents.v3alpha.BlockNode
-	18, // 15: com.seed.documents.v3alpha.Block.attributes:type_name -> com.seed.documents.v3alpha.Block.AttributesEntry
-	14, // 16: com.seed.documents.v3alpha.Block.annotations:type_name -> com.seed.documents.v3alpha.Annotation
-	19, // 17: com.seed.documents.v3alpha.Annotation.attributes:type_name -> com.seed.documents.v3alpha.Annotation.AttributesEntry
-	21, // 18: com.seed.documents.v3alpha.DocumentChange.set_metadata:type_name -> com.seed.documents.v3alpha.DocumentChange.SetMetadata
-	20, // 19: com.seed.documents.v3alpha.DocumentChange.move_block:type_name -> com.seed.documents.v3alpha.DocumentChange.MoveBlock
-	13, // 20: com.seed.documents.v3alpha.DocumentChange.replace_block:type_name -> com.seed.documents.v3alpha.Block
-	0,  // 21: com.seed.documents.v3alpha.Documents.GetDocument:input_type -> com.seed.documents.v3alpha.GetDocumentRequest
-	1,  // 22: com.seed.documents.v3alpha.Documents.CreateDocumentChange:input_type -> com.seed.documents.v3alpha.CreateDocumentChangeRequest
-	2,  // 23: com.seed.documents.v3alpha.Documents.DeleteDocument:input_type -> com.seed.documents.v3alpha.DeleteDocumentRequest
-	5,  // 24: com.seed.documents.v3alpha.Documents.ListDocuments:input_type -> com.seed.documents.v3alpha.ListDocumentsRequest
-	3,  // 25: com.seed.documents.v3alpha.Documents.ListRootDocuments:input_type -> com.seed.documents.v3alpha.ListRootDocumentsRequest
-	7,  // 26: com.seed.documents.v3alpha.Documents.ListDocumentChanges:input_type -> com.seed.documents.v3alpha.ListDocumentChangesRequest
-	11, // 27: com.seed.documents.v3alpha.Documents.GetDocument:output_type -> com.seed.documents.v3alpha.Document
-	11, // 28: com.seed.documents.v3alpha.Documents.CreateDocumentChange:output_type -> com.seed.documents.v3alpha.Document
-	23, // 29: com.seed.documents.v3alpha.Documents.DeleteDocument:output_type -> google.protobuf.Empty
-	6,  // 30: com.seed.documents.v3alpha.Documents.ListDocuments:output_type -> com.seed.documents.v3alpha.ListDocumentsResponse
-	4,  // 31: com.seed.documents.v3alpha.Documents.ListRootDocuments:output_type -> com.seed.documents.v3alpha.ListRootDocumentsResponse
-	8,  // 32: com.seed.documents.v3alpha.Documents.ListDocumentChanges:output_type -> com.seed.documents.v3alpha.ListDocumentChangesResponse
-	27, // [27:33] is the sub-list for method output_type
-	21, // [21:27] is the sub-list for method input_type
-	21, // [21:21] is the sub-list for extension type_name
-	21, // [21:21] is the sub-list for extension extendee
-	0,  // [0:21] is the sub-list for field type_name
+	17, // 0: com.seed.documents.v3alpha.CreateDocumentChangeRequest.changes:type_name -> com.seed.documents.v3alpha.DocumentChange
+	29, // 1: com.seed.documents.v3alpha.CreateDocumentChangeRequest.timestamp:type_name -> google.protobuf.Timestamp
+	12, // 2: com.seed.documents.v3alpha.ListRootDocumentsResponse.documents:type_name -> com.seed.documents.v3alpha.DocumentListItem
+	12, // 3: com.seed.documents.v3alpha.ListDocumentsResponse.documents:type_name -> com.seed.documents.v3alpha.DocumentListItem
+	11, // 4: com.seed.documents.v3alpha.ListDocumentChangesResponse.changes:type_name -> com.seed.documents.v3alpha.DocumentChangeInfo
+	19, // 5: com.seed.documents.v3alpha.CreateRefRequest.target:type_name -> com.seed.documents.v3alpha.RefTarget
+	29, // 6: com.seed.documents.v3alpha.CreateRefRequest.timestamp:type_name -> google.protobuf.Timestamp
+	29, // 7: com.seed.documents.v3alpha.DocumentChangeInfo.create_time:type_name -> google.protobuf.Timestamp
+	20, // 8: com.seed.documents.v3alpha.DocumentListItem.metadata:type_name -> com.seed.documents.v3alpha.DocumentListItem.MetadataEntry
+	29, // 9: com.seed.documents.v3alpha.DocumentListItem.create_time:type_name -> google.protobuf.Timestamp
+	29, // 10: com.seed.documents.v3alpha.DocumentListItem.update_time:type_name -> google.protobuf.Timestamp
+	21, // 11: com.seed.documents.v3alpha.Document.metadata:type_name -> com.seed.documents.v3alpha.Document.MetadataEntry
+	14, // 12: com.seed.documents.v3alpha.Document.content:type_name -> com.seed.documents.v3alpha.BlockNode
+	29, // 13: com.seed.documents.v3alpha.Document.create_time:type_name -> google.protobuf.Timestamp
+	29, // 14: com.seed.documents.v3alpha.Document.update_time:type_name -> google.protobuf.Timestamp
+	15, // 15: com.seed.documents.v3alpha.BlockNode.block:type_name -> com.seed.documents.v3alpha.Block
+	14, // 16: com.seed.documents.v3alpha.BlockNode.children:type_name -> com.seed.documents.v3alpha.BlockNode
+	22, // 17: com.seed.documents.v3alpha.Block.attributes:type_name -> com.seed.documents.v3alpha.Block.AttributesEntry
+	16, // 18: com.seed.documents.v3alpha.Block.annotations:type_name -> com.seed.documents.v3alpha.Annotation
+	23, // 19: com.seed.documents.v3alpha.Annotation.attributes:type_name -> com.seed.documents.v3alpha.Annotation.AttributesEntry
+	25, // 20: com.seed.documents.v3alpha.DocumentChange.set_metadata:type_name -> com.seed.documents.v3alpha.DocumentChange.SetMetadata
+	24, // 21: com.seed.documents.v3alpha.DocumentChange.move_block:type_name -> com.seed.documents.v3alpha.DocumentChange.MoveBlock
+	15, // 22: com.seed.documents.v3alpha.DocumentChange.replace_block:type_name -> com.seed.documents.v3alpha.Block
+	19, // 23: com.seed.documents.v3alpha.Ref.target:type_name -> com.seed.documents.v3alpha.RefTarget
+	29, // 24: com.seed.documents.v3alpha.Ref.timestamp:type_name -> google.protobuf.Timestamp
+	26, // 25: com.seed.documents.v3alpha.RefTarget.version:type_name -> com.seed.documents.v3alpha.RefTarget.Version
+	27, // 26: com.seed.documents.v3alpha.RefTarget.redirect:type_name -> com.seed.documents.v3alpha.RefTarget.Redirect
+	28, // 27: com.seed.documents.v3alpha.RefTarget.tombstone:type_name -> com.seed.documents.v3alpha.RefTarget.Tombstone
+	0,  // 28: com.seed.documents.v3alpha.Documents.GetDocument:input_type -> com.seed.documents.v3alpha.GetDocumentRequest
+	1,  // 29: com.seed.documents.v3alpha.Documents.CreateDocumentChange:input_type -> com.seed.documents.v3alpha.CreateDocumentChangeRequest
+	2,  // 30: com.seed.documents.v3alpha.Documents.DeleteDocument:input_type -> com.seed.documents.v3alpha.DeleteDocumentRequest
+	5,  // 31: com.seed.documents.v3alpha.Documents.ListDocuments:input_type -> com.seed.documents.v3alpha.ListDocumentsRequest
+	3,  // 32: com.seed.documents.v3alpha.Documents.ListRootDocuments:input_type -> com.seed.documents.v3alpha.ListRootDocumentsRequest
+	7,  // 33: com.seed.documents.v3alpha.Documents.ListDocumentChanges:input_type -> com.seed.documents.v3alpha.ListDocumentChangesRequest
+	9,  // 34: com.seed.documents.v3alpha.Documents.CreateRef:input_type -> com.seed.documents.v3alpha.CreateRefRequest
+	10, // 35: com.seed.documents.v3alpha.Documents.GetRef:input_type -> com.seed.documents.v3alpha.GetRefRequest
+	13, // 36: com.seed.documents.v3alpha.Documents.GetDocument:output_type -> com.seed.documents.v3alpha.Document
+	13, // 37: com.seed.documents.v3alpha.Documents.CreateDocumentChange:output_type -> com.seed.documents.v3alpha.Document
+	30, // 38: com.seed.documents.v3alpha.Documents.DeleteDocument:output_type -> google.protobuf.Empty
+	6,  // 39: com.seed.documents.v3alpha.Documents.ListDocuments:output_type -> com.seed.documents.v3alpha.ListDocumentsResponse
+	4,  // 40: com.seed.documents.v3alpha.Documents.ListRootDocuments:output_type -> com.seed.documents.v3alpha.ListRootDocumentsResponse
+	8,  // 41: com.seed.documents.v3alpha.Documents.ListDocumentChanges:output_type -> com.seed.documents.v3alpha.ListDocumentChangesResponse
+	18, // 42: com.seed.documents.v3alpha.Documents.CreateRef:output_type -> com.seed.documents.v3alpha.Ref
+	18, // 43: com.seed.documents.v3alpha.Documents.GetRef:output_type -> com.seed.documents.v3alpha.Ref
+	36, // [36:44] is the sub-list for method output_type
+	28, // [28:36] is the sub-list for method input_type
+	28, // [28:28] is the sub-list for extension type_name
+	28, // [28:28] is the sub-list for extension extendee
+	0,  // [0:28] is the sub-list for field type_name
 }
 
 func init() { file_documents_v3alpha_documents_proto_init() }
@@ -1928,7 +2555,7 @@ func file_documents_v3alpha_documents_proto_init() {
 			}
 		}
 		file_documents_v3alpha_documents_proto_msgTypes[9].Exporter = func(v any, i int) any {
-			switch v := v.(*DocumentChangeInfo); i {
+			switch v := v.(*CreateRefRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1940,7 +2567,7 @@ func file_documents_v3alpha_documents_proto_init() {
 			}
 		}
 		file_documents_v3alpha_documents_proto_msgTypes[10].Exporter = func(v any, i int) any {
-			switch v := v.(*DocumentListItem); i {
+			switch v := v.(*GetRefRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1952,7 +2579,7 @@ func file_documents_v3alpha_documents_proto_init() {
 			}
 		}
 		file_documents_v3alpha_documents_proto_msgTypes[11].Exporter = func(v any, i int) any {
-			switch v := v.(*Document); i {
+			switch v := v.(*DocumentChangeInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1964,7 +2591,7 @@ func file_documents_v3alpha_documents_proto_init() {
 			}
 		}
 		file_documents_v3alpha_documents_proto_msgTypes[12].Exporter = func(v any, i int) any {
-			switch v := v.(*BlockNode); i {
+			switch v := v.(*DocumentListItem); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1976,7 +2603,7 @@ func file_documents_v3alpha_documents_proto_init() {
 			}
 		}
 		file_documents_v3alpha_documents_proto_msgTypes[13].Exporter = func(v any, i int) any {
-			switch v := v.(*Block); i {
+			switch v := v.(*Document); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1988,7 +2615,7 @@ func file_documents_v3alpha_documents_proto_init() {
 			}
 		}
 		file_documents_v3alpha_documents_proto_msgTypes[14].Exporter = func(v any, i int) any {
-			switch v := v.(*Annotation); i {
+			switch v := v.(*BlockNode); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2000,6 +2627,30 @@ func file_documents_v3alpha_documents_proto_init() {
 			}
 		}
 		file_documents_v3alpha_documents_proto_msgTypes[15].Exporter = func(v any, i int) any {
+			switch v := v.(*Block); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_documents_v3alpha_documents_proto_msgTypes[16].Exporter = func(v any, i int) any {
+			switch v := v.(*Annotation); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_documents_v3alpha_documents_proto_msgTypes[17].Exporter = func(v any, i int) any {
 			switch v := v.(*DocumentChange); i {
 			case 0:
 				return &v.state
@@ -2011,7 +2662,31 @@ func file_documents_v3alpha_documents_proto_init() {
 				return nil
 			}
 		}
-		file_documents_v3alpha_documents_proto_msgTypes[20].Exporter = func(v any, i int) any {
+		file_documents_v3alpha_documents_proto_msgTypes[18].Exporter = func(v any, i int) any {
+			switch v := v.(*Ref); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_documents_v3alpha_documents_proto_msgTypes[19].Exporter = func(v any, i int) any {
+			switch v := v.(*RefTarget); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_documents_v3alpha_documents_proto_msgTypes[24].Exporter = func(v any, i int) any {
 			switch v := v.(*DocumentChange_MoveBlock); i {
 			case 0:
 				return &v.state
@@ -2023,7 +2698,7 @@ func file_documents_v3alpha_documents_proto_init() {
 				return nil
 			}
 		}
-		file_documents_v3alpha_documents_proto_msgTypes[21].Exporter = func(v any, i int) any {
+		file_documents_v3alpha_documents_proto_msgTypes[25].Exporter = func(v any, i int) any {
 			switch v := v.(*DocumentChange_SetMetadata); i {
 			case 0:
 				return &v.state
@@ -2035,20 +2710,61 @@ func file_documents_v3alpha_documents_proto_init() {
 				return nil
 			}
 		}
+		file_documents_v3alpha_documents_proto_msgTypes[26].Exporter = func(v any, i int) any {
+			switch v := v.(*RefTarget_Version); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_documents_v3alpha_documents_proto_msgTypes[27].Exporter = func(v any, i int) any {
+			switch v := v.(*RefTarget_Redirect); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_documents_v3alpha_documents_proto_msgTypes[28].Exporter = func(v any, i int) any {
+			switch v := v.(*RefTarget_Tombstone); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
-	file_documents_v3alpha_documents_proto_msgTypes[15].OneofWrappers = []any{
+	file_documents_v3alpha_documents_proto_msgTypes[17].OneofWrappers = []any{
 		(*DocumentChange_SetMetadata_)(nil),
 		(*DocumentChange_MoveBlock_)(nil),
 		(*DocumentChange_ReplaceBlock)(nil),
 		(*DocumentChange_DeleteBlock)(nil),
 	}
+	file_documents_v3alpha_documents_proto_msgTypes[19].OneofWrappers = []any{
+		(*RefTarget_Version_)(nil),
+		(*RefTarget_Redirect_)(nil),
+		(*RefTarget_Tombstone_)(nil),
+	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_documents_v3alpha_documents_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   22,
+			NumMessages:   29,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/backend/genproto/documents/v3alpha/documents_grpc.pb.go b/backend/genproto/documents/v3alpha/documents_grpc.pb.go
index 1de73683..601c476e 100644
--- a/backend/genproto/documents/v3alpha/documents_grpc.pb.go
+++ b/backend/genproto/documents/v3alpha/documents_grpc.pb.go
@@ -27,7 +27,10 @@ type DocumentsClient interface {
 	GetDocument(ctx context.Context, in *GetDocumentRequest, opts ...grpc.CallOption) (*Document, error)
 	// Creates a new Document Change.
 	CreateDocumentChange(ctx context.Context, in *CreateDocumentChangeRequest, opts ...grpc.CallOption) (*Document, error)
+	// Deprecated: Do not use.
 	// Deletes a document.
+	//
+	// Deprecated: Use CreateRef API.
 	DeleteDocument(ctx context.Context, in *DeleteDocumentRequest, opts ...grpc.CallOption) (*emptypb.Empty, error)
 	// Lists documents within the account. Only the most recent versions show up.
 	ListDocuments(ctx context.Context, in *ListDocumentsRequest, opts ...grpc.CallOption) (*ListDocumentsResponse, error)
@@ -35,6 +38,10 @@ type DocumentsClient interface {
 	ListRootDocuments(ctx context.Context, in *ListRootDocumentsRequest, opts ...grpc.CallOption) (*ListRootDocumentsResponse, error)
 	// Lists all changes of a document.
 	ListDocumentChanges(ctx context.Context, in *ListDocumentChangesRequest, opts ...grpc.CallOption) (*ListDocumentChangesResponse, error)
+	// Creates a Ref blob for the specified account + path.
+	CreateRef(ctx context.Context, in *CreateRefRequest, opts ...grpc.CallOption) (*Ref, error)
+	// Returns details about a Ref.
+	GetRef(ctx context.Context, in *GetRefRequest, opts ...grpc.CallOption) (*Ref, error)
 }
 
 type documentsClient struct {
@@ -63,6 +70,7 @@ func (c *documentsClient) CreateDocumentChange(ctx context.Context, in *CreateDo
 	return out, nil
 }
 
+// Deprecated: Do not use.
 func (c *documentsClient) DeleteDocument(ctx context.Context, in *DeleteDocumentRequest, opts ...grpc.CallOption) (*emptypb.Empty, error) {
 	out := new(emptypb.Empty)
 	err := c.cc.Invoke(ctx, "/com.seed.documents.v3alpha.Documents/DeleteDocument", in, out, opts...)
@@ -99,6 +107,24 @@ func (c *documentsClient) ListDocumentChanges(ctx context.Context, in *ListDocum
 	return out, nil
 }
 
+func (c *documentsClient) CreateRef(ctx context.Context, in *CreateRefRequest, opts ...grpc.CallOption) (*Ref, error) {
+	out := new(Ref)
+	err := c.cc.Invoke(ctx, "/com.seed.documents.v3alpha.Documents/CreateRef", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *documentsClient) GetRef(ctx context.Context, in *GetRefRequest, opts ...grpc.CallOption) (*Ref, error) {
+	out := new(Ref)
+	err := c.cc.Invoke(ctx, "/com.seed.documents.v3alpha.Documents/GetRef", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // DocumentsServer is the server API for Documents service.
 // All implementations should embed UnimplementedDocumentsServer
 // for forward compatibility
@@ -107,7 +133,10 @@ type DocumentsServer interface {
 	GetDocument(context.Context, *GetDocumentRequest) (*Document, error)
 	// Creates a new Document Change.
 	CreateDocumentChange(context.Context, *CreateDocumentChangeRequest) (*Document, error)
+	// Deprecated: Do not use.
 	// Deletes a document.
+	//
+	// Deprecated: Use CreateRef API.
 	DeleteDocument(context.Context, *DeleteDocumentRequest) (*emptypb.Empty, error)
 	// Lists documents within the account. Only the most recent versions show up.
 	ListDocuments(context.Context, *ListDocumentsRequest) (*ListDocumentsResponse, error)
@@ -115,6 +144,10 @@ type DocumentsServer interface {
 	ListRootDocuments(context.Context, *ListRootDocumentsRequest) (*ListRootDocumentsResponse, error)
 	// Lists all changes of a document.
 	ListDocumentChanges(context.Context, *ListDocumentChangesRequest) (*ListDocumentChangesResponse, error)
+	// Creates a Ref blob for the specified account + path.
+	CreateRef(context.Context, *CreateRefRequest) (*Ref, error)
+	// Returns details about a Ref.
+	GetRef(context.Context, *GetRefRequest) (*Ref, error)
 }
 
 // UnimplementedDocumentsServer should be embedded to have forward compatible implementations.
@@ -139,6 +172,12 @@ func (UnimplementedDocumentsServer) ListRootDocuments(context.Context, *ListRoot
 func (UnimplementedDocumentsServer) ListDocumentChanges(context.Context, *ListDocumentChangesRequest) (*ListDocumentChangesResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method ListDocumentChanges not implemented")
 }
+func (UnimplementedDocumentsServer) CreateRef(context.Context, *CreateRefRequest) (*Ref, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method CreateRef not implemented")
+}
+func (UnimplementedDocumentsServer) GetRef(context.Context, *GetRefRequest) (*Ref, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetRef not implemented")
+}
 
 // UnsafeDocumentsServer may be embedded to opt out of forward compatibility for this service.
 // Use of this interface is not recommended, as added methods to DocumentsServer will
@@ -259,6 +298,42 @@ func _Documents_ListDocumentChanges_Handler(srv interface{}, ctx context.Context
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Documents_CreateRef_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(CreateRefRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DocumentsServer).CreateRef(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/com.seed.documents.v3alpha.Documents/CreateRef",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DocumentsServer).CreateRef(ctx, req.(*CreateRefRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Documents_GetRef_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetRefRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DocumentsServer).GetRef(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/com.seed.documents.v3alpha.Documents/GetRef",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DocumentsServer).GetRef(ctx, req.(*GetRefRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // Documents_ServiceDesc is the grpc.ServiceDesc for Documents service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -290,6 +365,14 @@ var Documents_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "ListDocumentChanges",
 			Handler:    _Documents_ListDocumentChanges_Handler,
 		},
+		{
+			MethodName: "CreateRef",
+			Handler:    _Documents_CreateRef_Handler,
+		},
+		{
+			MethodName: "GetRef",
+			Handler:    _Documents_GetRef_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "documents/v3alpha/documents.proto",
diff --git a/frontend/packages/shared/src/client/.generated/documents/v3alpha/documents_connect.ts b/frontend/packages/shared/src/client/.generated/documents/v3alpha/documents_connect.ts
index e495fc46..8907557a 100644
--- a/frontend/packages/shared/src/client/.generated/documents/v3alpha/documents_connect.ts
+++ b/frontend/packages/shared/src/client/.generated/documents/v3alpha/documents_connect.ts
@@ -3,7 +3,7 @@
 /* eslint-disable */
 // @ts-nocheck
 
-import { CreateDocumentChangeRequest, DeleteDocumentRequest, Document, GetDocumentRequest, ListDocumentChangesRequest, ListDocumentChangesResponse, ListDocumentsRequest, ListDocumentsResponse, ListRootDocumentsRequest, ListRootDocumentsResponse } from "./documents_pb";
+import { CreateDocumentChangeRequest, CreateRefRequest, DeleteDocumentRequest, Document, GetDocumentRequest, GetRefRequest, ListDocumentChangesRequest, ListDocumentChangesResponse, ListDocumentsRequest, ListDocumentsResponse, ListRootDocumentsRequest, ListRootDocumentsResponse, Ref } from "./documents_pb";
 import { Empty, MethodKind } from "@bufbuild/protobuf";
 
 /**
@@ -39,7 +39,10 @@ export const Documents = {
     /**
      * Deletes a document.
      *
+     * Deprecated: Use CreateRef API.
+     *
      * @generated from rpc com.seed.documents.v3alpha.Documents.DeleteDocument
+     * @deprecated
      */
     deleteDocument: {
       name: "DeleteDocument",
@@ -80,6 +83,28 @@ export const Documents = {
       O: ListDocumentChangesResponse,
       kind: MethodKind.Unary,
     },
+    /**
+     * Creates a Ref blob for the specified account + path.
+     *
+     * @generated from rpc com.seed.documents.v3alpha.Documents.CreateRef
+     */
+    createRef: {
+      name: "CreateRef",
+      I: CreateRefRequest,
+      O: Ref,
+      kind: MethodKind.Unary,
+    },
+    /**
+     * Returns details about a Ref.
+     *
+     * @generated from rpc com.seed.documents.v3alpha.Documents.GetRef
+     */
+    getRef: {
+      name: "GetRef",
+      I: GetRefRequest,
+      O: Ref,
+      kind: MethodKind.Unary,
+    },
   }
 } as const;
 
diff --git a/frontend/packages/shared/src/client/.generated/documents/v3alpha/documents_pb.ts b/frontend/packages/shared/src/client/.generated/documents/v3alpha/documents_pb.ts
index 90e5292b..e5c1279b 100644
--- a/frontend/packages/shared/src/client/.generated/documents/v3alpha/documents_pb.ts
+++ b/frontend/packages/shared/src/client/.generated/documents/v3alpha/documents_pb.ts
@@ -29,11 +29,21 @@ export class GetDocumentRequest extends Message<GetDocumentRequest> {
 
   /**
    * Optional. Exact version of the document to retrieve.
+   * Empty version means "latest".
    *
    * @generated from field: string version = 3;
    */
   version = "";
 
+  /**
+   * Optional. Only applicable when requesting the latest version
+   * (i.e. when version field is empty).
+   * When this flag is set, the server will return the latest version known prior to deletion.
+   *
+   * @generated from field: bool ignore_deleted = 4;
+   */
+  ignoreDeleted = false;
+
   constructor(data?: PartialMessage<GetDocumentRequest>) {
     super();
     proto3.util.initPartial(data, this);
@@ -45,6 +55,7 @@ export class GetDocumentRequest extends Message<GetDocumentRequest> {
     { no: 1, name: "account", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 2, name: "path", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 3, name: "version", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 4, name: "ignore_deleted", kind: "scalar", T: 8 /* ScalarType.BOOL */ },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): GetDocumentRequest {
@@ -325,10 +336,17 @@ export class ListDocumentsRequest extends Message<ListDocumentsRequest> {
    */
   pageSize = 0;
 
+  /**
+   * Optional. Only list documents for those paths that are deleted.
+   *
+   * @generated from field: bool deleted_only = 3;
+   */
+  deletedOnly = false;
+
   /**
    * Optional. Value from next_page_token obtained from a previous response.
    *
-   * @generated from field: string page_token = 3;
+   * @generated from field: string page_token = 4;
    */
   pageToken = "";
 
@@ -342,7 +360,8 @@ export class ListDocumentsRequest extends Message<ListDocumentsRequest> {
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
     { no: 1, name: "account", kind: "scalar", T: 9 /* ScalarType.STRING */ },
     { no: 2, name: "page_size", kind: "scalar", T: 5 /* ScalarType.INT32 */ },
-    { no: 3, name: "page_token", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 3, name: "deleted_only", kind: "scalar", T: 8 /* ScalarType.BOOL */ },
+    { no: 4, name: "page_token", kind: "scalar", T: 9 /* ScalarType.STRING */ },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): ListDocumentsRequest {
@@ -533,6 +552,133 @@ export class ListDocumentChangesResponse extends Message<ListDocumentChangesResp
   }
 }
 
+/**
+ * Request to create a Ref.
+ *
+ * @generated from message com.seed.documents.v3alpha.CreateRefRequest
+ */
+export class CreateRefRequest extends Message<CreateRefRequest> {
+  /**
+   * Required. The ID of the account/space in which to create the Ref.
+   *
+   * @generated from field: string account = 1;
+   */
+  account = "";
+
+  /**
+   * Required. Path of the new Ref.
+   * Empty string means root document.
+   *
+   * @generated from field: string path = 2;
+   */
+  path = "";
+
+  /**
+   * Required. Target for the new Ref.
+   *
+   * @generated from field: com.seed.documents.v3alpha.RefTarget target = 3;
+   */
+  target?: RefTarget;
+
+  /**
+   * Required. Name of the signing key to use for signing the Ref.
+   *
+   * @generated from field: string signing_key_name = 4;
+   */
+  signingKeyName = "";
+
+  /**
+   * Optional. ID of the Capability blob that grants the necessary rights to the signin key
+   * to write Refs for the requested account + path.
+   *
+   * @generated from field: string capability = 5;
+   */
+  capability = "";
+
+  /**
+   * Optional. A timestamp of the Ref blob.
+   * If not specified the server will use the current time.
+   * The provided timestamp will be rounded to the nearest millisecond,
+   * so the final timestamp in the resulting Ref blob may not be exactly as provided.
+   *
+   * @generated from field: google.protobuf.Timestamp timestamp = 6;
+   */
+  timestamp?: Timestamp;
+
+  constructor(data?: PartialMessage<CreateRefRequest>) {
+    super();
+    proto3.util.initPartial(data, this);
+  }
+
+  static readonly runtime: typeof proto3 = proto3;
+  static readonly typeName = "com.seed.documents.v3alpha.CreateRefRequest";
+  static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "account", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 2, name: "path", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 3, name: "target", kind: "message", T: RefTarget },
+    { no: 4, name: "signing_key_name", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 5, name: "capability", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 6, name: "timestamp", kind: "message", T: Timestamp },
+  ]);
+
+  static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): CreateRefRequest {
+    return new CreateRefRequest().fromBinary(bytes, options);
+  }
+
+  static fromJson(jsonValue: JsonValue, options?: Partial<JsonReadOptions>): CreateRefRequest {
+    return new CreateRefRequest().fromJson(jsonValue, options);
+  }
+
+  static fromJsonString(jsonString: string, options?: Partial<JsonReadOptions>): CreateRefRequest {
+    return new CreateRefRequest().fromJsonString(jsonString, options);
+  }
+
+  static equals(a: CreateRefRequest | PlainMessage<CreateRefRequest> | undefined, b: CreateRefRequest | PlainMessage<CreateRefRequest> | undefined): boolean {
+    return proto3.util.equals(CreateRefRequest, a, b);
+  }
+}
+
+/**
+ * Request to get a Ref by ID.
+ *
+ * @generated from message com.seed.documents.v3alpha.GetRefRequest
+ */
+export class GetRefRequest extends Message<GetRefRequest> {
+  /**
+   * Required. ID of the Ref blob to retrieve.
+   *
+   * @generated from field: string id = 1;
+   */
+  id = "";
+
+  constructor(data?: PartialMessage<GetRefRequest>) {
+    super();
+    proto3.util.initPartial(data, this);
+  }
+
+  static readonly runtime: typeof proto3 = proto3;
+  static readonly typeName = "com.seed.documents.v3alpha.GetRefRequest";
+  static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "id", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+  ]);
+
+  static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): GetRefRequest {
+    return new GetRefRequest().fromBinary(bytes, options);
+  }
+
+  static fromJson(jsonValue: JsonValue, options?: Partial<JsonReadOptions>): GetRefRequest {
+    return new GetRefRequest().fromJson(jsonValue, options);
+  }
+
+  static fromJsonString(jsonString: string, options?: Partial<JsonReadOptions>): GetRefRequest {
+    return new GetRefRequest().fromJsonString(jsonString, options);
+  }
+
+  static equals(a: GetRefRequest | PlainMessage<GetRefRequest> | undefined, b: GetRefRequest | PlainMessage<GetRefRequest> | undefined): boolean {
+    return proto3.util.equals(GetRefRequest, a, b);
+  }
+}
+
 /**
  * Information about a particular document version.
  *
@@ -1209,3 +1355,294 @@ export class DocumentChange_SetMetadata extends Message<DocumentChange_SetMetada
   }
 }
 
+/**
+ * Description of a Ref blob.
+ *
+ * @generated from message com.seed.documents.v3alpha.Ref
+ */
+export class Ref extends Message<Ref> {
+  /**
+   * CID of the Ref blob.
+   *
+   * @generated from field: string id = 1;
+   */
+  id = "";
+
+  /**
+   * Account (space) in which the Ref blob exists.
+   *
+   * @generated from field: string account = 2;
+   */
+  account = "";
+
+  /**
+   * Path in the account Ref creates an entry for.
+   *
+   * @generated from field: string path = 3;
+   */
+  path = "";
+
+  /**
+   * Description of where the Ref points to.
+   *
+   * @generated from field: com.seed.documents.v3alpha.RefTarget target = 4;
+   */
+  target?: RefTarget;
+
+  /**
+   * Public key used to sign the Ref blob.
+   *
+   * @generated from field: string signer = 5;
+   */
+  signer = "";
+
+  /**
+   * Optional. ID of the Capability attached to this Ref.
+   *
+   * @generated from field: string capability = 6;
+   */
+  capability = "";
+
+  /**
+   * Timestamp of the Ref.
+   *
+   * @generated from field: google.protobuf.Timestamp timestamp = 7;
+   */
+  timestamp?: Timestamp;
+
+  constructor(data?: PartialMessage<Ref>) {
+    super();
+    proto3.util.initPartial(data, this);
+  }
+
+  static readonly runtime: typeof proto3 = proto3;
+  static readonly typeName = "com.seed.documents.v3alpha.Ref";
+  static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "id", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 2, name: "account", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 3, name: "path", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 4, name: "target", kind: "message", T: RefTarget },
+    { no: 5, name: "signer", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 6, name: "capability", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 7, name: "timestamp", kind: "message", T: Timestamp },
+  ]);
+
+  static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): Ref {
+    return new Ref().fromBinary(bytes, options);
+  }
+
+  static fromJson(jsonValue: JsonValue, options?: Partial<JsonReadOptions>): Ref {
+    return new Ref().fromJson(jsonValue, options);
+  }
+
+  static fromJsonString(jsonString: string, options?: Partial<JsonReadOptions>): Ref {
+    return new Ref().fromJsonString(jsonString, options);
+  }
+
+  static equals(a: Ref | PlainMessage<Ref> | undefined, b: Ref | PlainMessage<Ref> | undefined): boolean {
+    return proto3.util.equals(Ref, a, b);
+  }
+}
+
+/**
+ * Description of where the Ref points to.
+ *
+ * @generated from message com.seed.documents.v3alpha.RefTarget
+ */
+export class RefTarget extends Message<RefTarget> {
+  /**
+   * A Ref can point to one of the following targets.
+   *
+   * @generated from oneof com.seed.documents.v3alpha.RefTarget.target
+   */
+  target: {
+    /**
+     * Version target describes genesis + head changes (version).
+     *
+     * @generated from field: com.seed.documents.v3alpha.RefTarget.Version version = 1;
+     */
+    value: RefTarget_Version;
+    case: "version";
+  } | {
+    /**
+     * Redirect target makes a Ref point to a different account + path.
+     * Users must be careful to not create cycles or very deep redirect chains.
+     * Client should be careful not to get stuck in redirects
+     * by tracking visited paths to prevent cycles,
+     * and by limiting the depth of the redirect chains,
+     * while handling redirects.
+     *
+     * @generated from field: com.seed.documents.v3alpha.RefTarget.Redirect redirect = 2;
+     */
+    value: RefTarget_Redirect;
+    case: "redirect";
+  } | {
+    /**
+     * Tombstone Ref indicates the intent to delete the given account + path.
+     *
+     * @generated from field: com.seed.documents.v3alpha.RefTarget.Tombstone tombstone = 3;
+     */
+    value: RefTarget_Tombstone;
+    case: "tombstone";
+  } | { case: undefined; value?: undefined } = { case: undefined };
+
+  constructor(data?: PartialMessage<RefTarget>) {
+    super();
+    proto3.util.initPartial(data, this);
+  }
+
+  static readonly runtime: typeof proto3 = proto3;
+  static readonly typeName = "com.seed.documents.v3alpha.RefTarget";
+  static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "version", kind: "message", T: RefTarget_Version, oneof: "target" },
+    { no: 2, name: "redirect", kind: "message", T: RefTarget_Redirect, oneof: "target" },
+    { no: 3, name: "tombstone", kind: "message", T: RefTarget_Tombstone, oneof: "target" },
+  ]);
+
+  static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): RefTarget {
+    return new RefTarget().fromBinary(bytes, options);
+  }
+
+  static fromJson(jsonValue: JsonValue, options?: Partial<JsonReadOptions>): RefTarget {
+    return new RefTarget().fromJson(jsonValue, options);
+  }
+
+  static fromJsonString(jsonString: string, options?: Partial<JsonReadOptions>): RefTarget {
+    return new RefTarget().fromJsonString(jsonString, options);
+  }
+
+  static equals(a: RefTarget | PlainMessage<RefTarget> | undefined, b: RefTarget | PlainMessage<RefTarget> | undefined): boolean {
+    return proto3.util.equals(RefTarget, a, b);
+  }
+}
+
+/**
+ * @generated from message com.seed.documents.v3alpha.RefTarget.Version
+ */
+export class RefTarget_Version extends Message<RefTarget_Version> {
+  /**
+   * Required. ID of the genesis Change.
+   *
+   * @generated from field: string genesis = 1;
+   */
+  genesis = "";
+
+  /**
+   * Required. Version ID (possibly compount).
+   * Each change in the version ID must have the same genesis.
+   *
+   * @generated from field: string version = 2;
+   */
+  version = "";
+
+  constructor(data?: PartialMessage<RefTarget_Version>) {
+    super();
+    proto3.util.initPartial(data, this);
+  }
+
+  static readonly runtime: typeof proto3 = proto3;
+  static readonly typeName = "com.seed.documents.v3alpha.RefTarget.Version";
+  static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "genesis", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 2, name: "version", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+  ]);
+
+  static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): RefTarget_Version {
+    return new RefTarget_Version().fromBinary(bytes, options);
+  }
+
+  static fromJson(jsonValue: JsonValue, options?: Partial<JsonReadOptions>): RefTarget_Version {
+    return new RefTarget_Version().fromJson(jsonValue, options);
+  }
+
+  static fromJsonString(jsonString: string, options?: Partial<JsonReadOptions>): RefTarget_Version {
+    return new RefTarget_Version().fromJsonString(jsonString, options);
+  }
+
+  static equals(a: RefTarget_Version | PlainMessage<RefTarget_Version> | undefined, b: RefTarget_Version | PlainMessage<RefTarget_Version> | undefined): boolean {
+    return proto3.util.equals(RefTarget_Version, a, b);
+  }
+}
+
+/**
+ * @generated from message com.seed.documents.v3alpha.RefTarget.Redirect
+ */
+export class RefTarget_Redirect extends Message<RefTarget_Redirect> {
+  /**
+   * Required. Account ID to which the Ref should redirect.
+   * Can be the same as the account in the Ref itself,
+   * when we redirect to a different path in the same account/space.
+   *
+   * @generated from field: string account = 1;
+   */
+  account = "";
+
+  /**
+   * Required. Path to which the Ref should redirect.
+   * Empty string means root document.
+   * Must not be the same as the Ref itself.
+   *
+   * @generated from field: string path = 2;
+   */
+  path = "";
+
+  constructor(data?: PartialMessage<RefTarget_Redirect>) {
+    super();
+    proto3.util.initPartial(data, this);
+  }
+
+  static readonly runtime: typeof proto3 = proto3;
+  static readonly typeName = "com.seed.documents.v3alpha.RefTarget.Redirect";
+  static readonly fields: FieldList = proto3.util.newFieldList(() => [
+    { no: 1, name: "account", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 2, name: "path", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+  ]);
+
+  static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): RefTarget_Redirect {
+    return new RefTarget_Redirect().fromBinary(bytes, options);
+  }
+
+  static fromJson(jsonValue: JsonValue, options?: Partial<JsonReadOptions>): RefTarget_Redirect {
+    return new RefTarget_Redirect().fromJson(jsonValue, options);
+  }
+
+  static fromJsonString(jsonString: string, options?: Partial<JsonReadOptions>): RefTarget_Redirect {
+    return new RefTarget_Redirect().fromJsonString(jsonString, options);
+  }
+
+  static equals(a: RefTarget_Redirect | PlainMessage<RefTarget_Redirect> | undefined, b: RefTarget_Redirect | PlainMessage<RefTarget_Redirect> | undefined): boolean {
+    return proto3.util.equals(RefTarget_Redirect, a, b);
+  }
+}
+
+/**
+ * @generated from message com.seed.documents.v3alpha.RefTarget.Tombstone
+ */
+export class RefTarget_Tombstone extends Message<RefTarget_Tombstone> {
+  constructor(data?: PartialMessage<RefTarget_Tombstone>) {
+    super();
+    proto3.util.initPartial(data, this);
+  }
+
+  static readonly runtime: typeof proto3 = proto3;
+  static readonly typeName = "com.seed.documents.v3alpha.RefTarget.Tombstone";
+  static readonly fields: FieldList = proto3.util.newFieldList(() => [
+  ]);
+
+  static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): RefTarget_Tombstone {
+    return new RefTarget_Tombstone().fromBinary(bytes, options);
+  }
+
+  static fromJson(jsonValue: JsonValue, options?: Partial<JsonReadOptions>): RefTarget_Tombstone {
+    return new RefTarget_Tombstone().fromJson(jsonValue, options);
+  }
+
+  static fromJsonString(jsonString: string, options?: Partial<JsonReadOptions>): RefTarget_Tombstone {
+    return new RefTarget_Tombstone().fromJsonString(jsonString, options);
+  }
+
+  static equals(a: RefTarget_Tombstone | PlainMessage<RefTarget_Tombstone> | undefined, b: RefTarget_Tombstone | PlainMessage<RefTarget_Tombstone> | undefined): boolean {
+    return proto3.util.equals(RefTarget_Tombstone, a, b);
+  }
+}
+
diff --git a/proto/documents/v3alpha/documents.proto b/proto/documents/v3alpha/documents.proto
index 43330234..de8812ba 100644
--- a/proto/documents/v3alpha/documents.proto
+++ b/proto/documents/v3alpha/documents.proto
@@ -16,7 +16,11 @@ service Documents {
   rpc CreateDocumentChange(CreateDocumentChangeRequest) returns (Document);
 
   // Deletes a document.
-  rpc DeleteDocument(DeleteDocumentRequest) returns (google.protobuf.Empty);
+  //
+  // Deprecated: Use CreateRef API.
+  rpc DeleteDocument(DeleteDocumentRequest) returns (google.protobuf.Empty) {
+    option deprecated = true;
+  };
 
   // Lists documents within the account. Only the most recent versions show up.
   rpc ListDocuments(ListDocumentsRequest) returns (ListDocumentsResponse);
@@ -26,6 +30,12 @@ service Documents {
 
   // Lists all changes of a document.
   rpc ListDocumentChanges(ListDocumentChangesRequest) returns (ListDocumentChangesResponse);
+
+  // Creates a Ref blob for the specified account + path.
+  rpc CreateRef(CreateRefRequest) returns (Ref);
+
+  // Returns details about a Ref.
+  rpc GetRef(GetRefRequest) returns (Ref);
 }
 
 // Request for getting a single document.
@@ -38,7 +48,13 @@ message GetDocumentRequest {
   string path = 2;
 
   // Optional. Exact version of the document to retrieve.
+  // Empty version means "latest".
   string version = 3;
+
+  // Optional. Only applicable when requesting the latest version
+  // (i.e. when version field is empty).
+  // When this flag is set, the server will return the latest version known prior to deletion.
+  bool ignore_deleted = 4;
 }
 
 // Request to create a new document change.
@@ -106,8 +122,11 @@ message ListDocumentsRequest {
   // Optional. Number of results per page. Default is defined by the server.
   int32 page_size = 2;
 
+  // Optional. Only list documents for those paths that are deleted.
+  bool deleted_only = 3;
+
   // Optional. Value from next_page_token obtained from a previous response.
-  string page_token = 3;
+  string page_token = 4;
 }
 
 // Response with list of documents.
@@ -146,6 +165,38 @@ message ListDocumentChangesResponse {
   string next_page_token = 2;
 }
 
+// Request to create a Ref.
+message CreateRefRequest {
+  // Required. The ID of the account/space in which to create the Ref.
+  string account = 1;
+
+  // Required. Path of the new Ref.
+  // Empty string means root document.
+  string path = 2;
+
+  // Required. Target for the new Ref.
+  RefTarget target = 3;
+
+  // Required. Name of the signing key to use for signing the Ref.
+  string signing_key_name = 4;
+
+  // Optional. ID of the Capability blob that grants the necessary rights to the signin key
+  // to write Refs for the requested account + path.
+  string capability = 5;
+
+  // Optional. A timestamp of the Ref blob.
+  // If not specified the server will use the current time.
+  // The provided timestamp will be rounded to the nearest millisecond,
+  // so the final timestamp in the resulting Ref blob may not be exactly as provided.
+  google.protobuf.Timestamp timestamp = 6;
+}
+
+// Request to get a Ref by ID.
+message GetRefRequest {
+  // Required. ID of the Ref blob to retrieve.
+  string id = 1;
+}
+
 // Information about a particular document version.
 message DocumentChangeInfo {
   // CID of the change.
@@ -324,3 +375,70 @@ message DocumentChange {
     string delete_block = 4;
   }
 }
+
+// Description of a Ref blob.
+message Ref {
+  // CID of the Ref blob.
+  string id = 1;
+
+  // Account (space) in which the Ref blob exists.
+  string account = 2;
+
+  // Path in the account Ref creates an entry for.
+  string path = 3;
+
+  // Description of where the Ref points to.
+  RefTarget target = 4;
+
+  // Public key used to sign the Ref blob.
+  string signer = 5;
+
+  // Optional. ID of the Capability attached to this Ref.
+  string capability = 6;
+
+  // Timestamp of the Ref.
+  google.protobuf.Timestamp timestamp = 7;
+}
+
+// Description of where the Ref points to.
+message RefTarget {
+  // A Ref can point to one of the following targets.
+  oneof target {
+    // Version target describes genesis + head changes (version).
+    Version version = 1;
+
+    // Redirect target makes a Ref point to a different account + path.
+    // Users must be careful to not create cycles or very deep redirect chains.
+    // Client should be careful not to get stuck in redirects
+    // by tracking visited paths to prevent cycles,
+    // and by limiting the depth of the redirect chains,
+    // while handling redirects.
+    Redirect redirect = 2;
+
+    // Tombstone Ref indicates the intent to delete the given account + path.
+    Tombstone tombstone = 3;
+  }
+
+  message Version {
+    // Required. ID of the genesis Change.
+    string genesis = 1;
+
+    // Required. Version ID (possibly compount).
+    // Each change in the version ID must have the same genesis.
+    string version = 2;
+  }
+
+  message Redirect {
+    // Required. Account ID to which the Ref should redirect.
+    // Can be the same as the account in the Ref itself,
+    // when we redirect to a different path in the same account/space.
+    string account = 1;
+
+    // Required. Path to which the Ref should redirect.
+    // Empty string means root document.
+    // Must not be the same as the Ref itself.
+    string path = 2;
+  }
+
+  message Tombstone {}
+}
diff --git a/proto/documents/v3alpha/go.gensum b/proto/documents/v3alpha/go.gensum
index b9fca042..7592bfbf 100644
--- a/proto/documents/v3alpha/go.gensum
+++ b/proto/documents/v3alpha/go.gensum
@@ -1,2 +1,2 @@
-srcs: 5aac17e3ae6dfe5e6a93024eb772a56a
-outs: 3c76d890a9ed48c5244da5c96f75b247
+srcs: 8a516d2c36f40879689c14fa66ade807
+outs: f9ea0ab1f75f622f43e24eb3293c8029
diff --git a/proto/documents/v3alpha/js.gensum b/proto/documents/v3alpha/js.gensum
index 64b92d92..f0c33e17 100644
--- a/proto/documents/v3alpha/js.gensum
+++ b/proto/documents/v3alpha/js.gensum
@@ -1,2 +1,2 @@
-srcs: 5aac17e3ae6dfe5e6a93024eb772a56a
-outs: ad3e117103a516ccb5860ca396666375
+srcs: 8a516d2c36f40879689c14fa66ade807
+outs: 00f7d4586cc18855eedac1e628bef190