diff --git a/zetaclient/chains/interfaces/interfaces.go b/zetaclient/chains/interfaces/interfaces.go
index 77c2cbd966..8b3cf97921 100644
--- a/zetaclient/chains/interfaces/interfaces.go
+++ b/zetaclient/chains/interfaces/interfaces.go
@@ -42,7 +42,9 @@ const (
 type ChainObserver interface {
 	Start()
 	Stop()
+	OpenDB(dbPath string, dbName string) error
 	LoadDB(dbPath string) error
+	SaveLastBlockScanned(blockNumber uint64) error
 	IsOutboundProcessed(cctx *crosschaintypes.CrossChainTx, logger zerolog.Logger) (bool, bool, error)
 	SetChainParams(observertypes.ChainParams)
 	GetChainParams() observertypes.ChainParams
diff --git a/zetaclient/orchestrator/chain_activate_test.go b/zetaclient/orchestrator/chain_activate_test.go
index 7df06647f5..4304398a17 100644
--- a/zetaclient/orchestrator/chain_activate_test.go
+++ b/zetaclient/orchestrator/chain_activate_test.go
@@ -124,6 +124,15 @@ func Test_ActivateChains(t *testing.T) {
 			newObserverMap := make(map[int64]interfaces.ChainObserver)
 			oc.CreateSignerObserverEVM(newSignerMap, newObserverMap)
 
+			// open db and save last block number to db to avoid RPC call
+			ob := newObserverMap[tt.evmChain.ChainId]
+			require.NotNil(t, ob)
+			err := ob.OpenDB(testutils.SQLiteMemory, tt.evmCfg.Chain.ChainName.String())
+			require.NoError(t, err)
+
+			err = ob.SaveLastBlockScanned(100)
+			require.NoError(t, err)
+
 			// activate chains
 			oc.ActivateChains(newSignerMap, newObserverMap)
 
@@ -189,11 +198,20 @@ func Test_DeactivateChains(t *testing.T) {
 			newObserverMap := make(map[int64]interfaces.ChainObserver)
 			oc.CreateSignerObserverEVM(newSignerMap, newObserverMap)
 
+			// open db and save last block number to db to avoid RPC call
+			ob := newObserverMap[tt.evmChain.ChainId]
+			require.NotNil(t, ob)
+			err := ob.OpenDB(testutils.SQLiteMemory, tt.evmCfg.Chain.ChainName.String())
+			require.NoError(t, err)
+
+			err = ob.SaveLastBlockScanned(100)
+			require.NoError(t, err)
+
 			// activate chains
 			oc.ActivateChains(newSignerMap, newObserverMap)
 
 			// assert signer/observer map
-			ob, err := oc.GetUpdatedChainObserver(tt.evmChain.ChainId)
+			ob, err = oc.GetUpdatedChainObserver(tt.evmChain.ChainId)
 			require.NoError(t, err)
 			require.NotNil(t, ob)
 
diff --git a/zetaclient/testutils/mocks/chain_clients.go b/zetaclient/testutils/mocks/chain_clients.go
index b9f75cf169..38690eda92 100644
--- a/zetaclient/testutils/mocks/chain_clients.go
+++ b/zetaclient/testutils/mocks/chain_clients.go
@@ -30,10 +30,18 @@ func (ob *EVMObserver) Start() {
 func (ob *EVMObserver) Stop() {
 }
 
+func (ob *EVMObserver) OpenDB(_, _ string) error {
+	return nil
+}
+
 func (ob *EVMObserver) LoadDB(_ string) error {
 	return nil
 }
 
+func (ob *EVMObserver) SaveLastBlockScanned(_ uint64) error {
+	return nil
+}
+
 func (ob *EVMObserver) IsOutboundProcessed(_ *crosschaintypes.CrossChainTx, _ zerolog.Logger) (bool, bool, error) {
 	return false, false, nil
 }
@@ -75,10 +83,18 @@ func (ob *BTCObserver) Start() {
 func (ob *BTCObserver) Stop() {
 }
 
+func (ob *BTCObserver) OpenDB(_, _ string) error {
+	return nil
+}
+
 func (ob *BTCObserver) LoadDB(_ string) error {
 	return nil
 }
 
+func (ob *BTCObserver) SaveLastBlockScanned(_ uint64) error {
+	return nil
+}
+
 func (ob *BTCObserver) IsOutboundProcessed(_ *crosschaintypes.CrossChainTx, _ zerolog.Logger) (bool, bool, error) {
 	return false, false, nil
 }
diff --git a/zetaclient/zetacore/client.go b/zetaclient/zetacore/client.go
index 722e53d3b3..a8fffd9ea1 100644
--- a/zetaclient/zetacore/client.go
+++ b/zetaclient/zetacore/client.go
@@ -266,7 +266,8 @@ func (c *Client) UpdateAppContext(appContext *context.AppContext, logger zerolog
 		// just in case (zetacore already validated)
 		err := observertypes.ValidateChainParams(chainParam)
 		if err != nil {
-			return errors.Wrapf(err, "Invalid chain params for chain %d", chainParam.ChainId)
+			logger.Error().Err(err).Msgf("Invalid chain params for chain %d", chainParam.ChainId)
+			continue
 		}
 
 		// zetaclient detects Bitcoin network (regnet, testnet, mainnet) from chain params in zetacore
diff --git a/zetaclient/zetacore/tx_test.go b/zetaclient/zetacore/tx_test.go
index 5bf8babb3d..92672f442c 100644
--- a/zetaclient/zetacore/tx_test.go
+++ b/zetaclient/zetacore/tx_test.go
@@ -4,14 +4,16 @@ import (
 	"bytes"
 	"encoding/hex"
 	"errors"
-	"github.com/zeta-chain/zetacore/testutil/sample"
-	authoritytypes "github.com/zeta-chain/zetacore/x/authority/types"
 	"math/big"
 	"net"
 	"os"
 	"testing"
 
+	"github.com/zeta-chain/zetacore/testutil/sample"
+	authoritytypes "github.com/zeta-chain/zetacore/x/authority/types"
+
 	"cosmossdk.io/math"
+	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdktypes "github.com/cosmos/cosmos-sdk/types"
 	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
 	ethtypes "github.com/ethereum/go-ethereum/core/types"
@@ -228,12 +230,28 @@ func TestZetacore_UpdateAppContext(t *testing.T) {
 							IsSupported: true,
 						},
 						{
-							ChainId:     chains.Ethereum.ChainId,
-							IsSupported: true,
+							ChainId:                   chains.Ethereum.ChainId,
+							ConfirmationCount:         32,
+							InboundTicker:             15,
+							OutboundTicker:            15,
+							GasPriceTicker:            300,
+							OutboundScheduleInterval:  64,
+							OutboundScheduleLookahead: 10,
+							BallotThreshold:           sdk.MustNewDecFromStr("0.6"),
+							MinObserverDelegation:     sdk.MustNewDecFromStr("1000000000000000000"),
+							IsSupported:               true,
 						},
 						{
-							ChainId:     chains.BitcoinMainnet.ChainId,
-							IsSupported: true,
+							ChainId:                   chains.BitcoinMainnet.ChainId,
+							ConfirmationCount:         32,
+							InboundTicker:             15,
+							OutboundTicker:            15,
+							GasPriceTicker:            300,
+							OutboundScheduleInterval:  64,
+							OutboundScheduleLookahead: 10,
+							BallotThreshold:           sdk.MustNewDecFromStr("0.6"),
+							MinObserverDelegation:     sdk.MustNewDecFromStr("1000000000000000000"),
+							IsSupported:               true,
 						},
 					},
 				}})