diff --git a/dist/Tinlake.d.ts b/dist/Tinlake.d.ts
index 9479432..cabe874 100644
--- a/dist/Tinlake.d.ts
+++ b/dist/Tinlake.d.ts
@@ -64,6 +64,7 @@ interface ethI {
     contract: (arg0: any) => {
         at: (arg0: any) => void;
     };
+    abi: any;
 }
 export declare type Address = string;
 export interface Loan {
@@ -110,7 +111,7 @@ export declare class Tinlake {
     /**
      * @param owner Owner of the new NFT
      */
-    mintNFT: (owner: string, tokenId: string) => Promise<unknown>;
+    mintNFT: (owner: string, tokenId: string, ref: string, amount: string, asset: string) => Promise<unknown>;
     /**
      * @param owner Owner of the created loan
      */
diff --git a/dist/Tinlake.es.js b/dist/Tinlake.es.js
index 120f569..a161a5f 100644
--- a/dist/Tinlake.es.js
+++ b/dist/Tinlake.es.js
@@ -27857,25 +27857,6 @@ var contractAbiNft = [
     stateMutability: "nonpayable",
     type: "function"
   },
-  {
-    constant: false,
-    inputs: [
-      {
-        name: "usr",
-        type: "address"
-      },
-      {
-        name: "tkn",
-        type: "uint256"
-      }
-    ],
-    name: "mint",
-    outputs: [
-    ],
-    payable: false,
-    stateMutability: "nonpayable",
-    type: "function"
-  },
   {
     constant: false,
     inputs: [
@@ -28017,6 +27998,37 @@ var contractAbiNft = [
     stateMutability: "view",
     type: "function"
   },
+  {
+    constant: false,
+    inputs: [
+      {
+        name: "usr",
+        type: "address"
+      },
+      {
+        name: "tkn",
+        type: "uint256"
+      },
+      {
+        name: "ref",
+        type: "string"
+      },
+      {
+        name: "amount",
+        type: "uint256"
+      },
+      {
+        name: "asset",
+        type: "string"
+      }
+    ],
+    name: "mint",
+    outputs: [
+    ],
+    payable: false,
+    stateMutability: "nonpayable",
+    type: "function"
+  },
   {
     constant: true,
     inputs: [
@@ -28040,6 +28052,37 @@ var contractAbiNft = [
     stateMutability: "view",
     type: "function"
   },
+  {
+    constant: true,
+    inputs: [
+      {
+        name: "",
+        type: "uint256"
+      }
+    ],
+    name: "data",
+    outputs: [
+      {
+        name: "reference_id",
+        type: "string"
+      },
+      {
+        name: "amount",
+        type: "uint256"
+      },
+      {
+        name: "asset_type",
+        type: "string"
+      },
+      {
+        name: "borrower",
+        type: "address"
+      }
+    ],
+    payable: false,
+    stateMutability: "view",
+    type: "function"
+  },
   {
     inputs: [
     ],
@@ -34723,15 +34766,14 @@ var Tinlake = /** @class */ (function () {
         /**
          * @param owner Owner of the new NFT
          */
-        this.mintNFT = function (owner, tokenId) { return __awaiter(_this, void 0, void 0, function () {
-            var tkn, txHash;
+        this.mintNFT = function (owner, tokenId, ref, amount, asset) { return __awaiter(_this, void 0, void 0, function () {
+            var txHash;
             return __generator(this, function (_a) {
                 switch (_a.label) {
-                    case 0:
-                        tkn = abiCoder$1.encodeParameter('uint', tokenId);
-                        return [4 /*yield*/, this.contracts.nft.mint(owner, tkn, this.ethConfig)];
+                    case 0: return [4 /*yield*/, executeAndRetry(this.contracts.nft.mint, [owner, tokenId, ref, amount, asset, this.ethConfig])];
                     case 1:
                         txHash = _a.sent();
+                        console.log("[NFT.mint] txHash: " + txHash);
                         return [2 /*return*/, waitAndReturnEvents(this.eth, txHash, this.contracts['nft'].abi, this.transactionTimeout)];
                 }
             });
@@ -35017,7 +35059,7 @@ function executeAndRetry(f, args) {
                     return [2 /*return*/, result];
                 case 2:
                     e_1 = _a.sent();
-                    // using error message, since error code -32603 is not unique enough
+                    // using error message, since error code -32603 is not unique enough 
                     // todo introduce retry limit
                     if (e_1 && e_1.message && (e_1.message.indexOf("Cannot read property 'number' of null") !== -1 ||
                         e_1.message.indexOf('error with payload') !== -1)) {
diff --git a/dist/Tinlake.js b/dist/Tinlake.js
index a0670ed..2fe313b 100644
--- a/dist/Tinlake.js
+++ b/dist/Tinlake.js
@@ -27863,25 +27863,6 @@ var contractAbiNft = [
     stateMutability: "nonpayable",
     type: "function"
   },
-  {
-    constant: false,
-    inputs: [
-      {
-        name: "usr",
-        type: "address"
-      },
-      {
-        name: "tkn",
-        type: "uint256"
-      }
-    ],
-    name: "mint",
-    outputs: [
-    ],
-    payable: false,
-    stateMutability: "nonpayable",
-    type: "function"
-  },
   {
     constant: false,
     inputs: [
@@ -28023,6 +28004,37 @@ var contractAbiNft = [
     stateMutability: "view",
     type: "function"
   },
+  {
+    constant: false,
+    inputs: [
+      {
+        name: "usr",
+        type: "address"
+      },
+      {
+        name: "tkn",
+        type: "uint256"
+      },
+      {
+        name: "ref",
+        type: "string"
+      },
+      {
+        name: "amount",
+        type: "uint256"
+      },
+      {
+        name: "asset",
+        type: "string"
+      }
+    ],
+    name: "mint",
+    outputs: [
+    ],
+    payable: false,
+    stateMutability: "nonpayable",
+    type: "function"
+  },
   {
     constant: true,
     inputs: [
@@ -28046,6 +28058,37 @@ var contractAbiNft = [
     stateMutability: "view",
     type: "function"
   },
+  {
+    constant: true,
+    inputs: [
+      {
+        name: "",
+        type: "uint256"
+      }
+    ],
+    name: "data",
+    outputs: [
+      {
+        name: "reference_id",
+        type: "string"
+      },
+      {
+        name: "amount",
+        type: "uint256"
+      },
+      {
+        name: "asset_type",
+        type: "string"
+      },
+      {
+        name: "borrower",
+        type: "address"
+      }
+    ],
+    payable: false,
+    stateMutability: "view",
+    type: "function"
+  },
   {
     inputs: [
     ],
@@ -34729,15 +34772,14 @@ var Tinlake = /** @class */ (function () {
         /**
          * @param owner Owner of the new NFT
          */
-        this.mintNFT = function (owner, tokenId) { return __awaiter(_this, void 0, void 0, function () {
-            var tkn, txHash;
+        this.mintNFT = function (owner, tokenId, ref, amount, asset) { return __awaiter(_this, void 0, void 0, function () {
+            var txHash;
             return __generator(this, function (_a) {
                 switch (_a.label) {
-                    case 0:
-                        tkn = abiCoder$1.encodeParameter('uint', tokenId);
-                        return [4 /*yield*/, this.contracts.nft.mint(owner, tkn, this.ethConfig)];
+                    case 0: return [4 /*yield*/, executeAndRetry(this.contracts.nft.mint, [owner, tokenId, ref, amount, asset, this.ethConfig])];
                     case 1:
                         txHash = _a.sent();
+                        console.log("[NFT.mint] txHash: " + txHash);
                         return [2 /*return*/, waitAndReturnEvents(this.eth, txHash, this.contracts['nft'].abi, this.transactionTimeout)];
                 }
             });
@@ -35023,7 +35065,7 @@ function executeAndRetry(f, args) {
                     return [2 /*return*/, result];
                 case 2:
                     e_1 = _a.sent();
-                    // using error message, since error code -32603 is not unique enough
+                    // using error message, since error code -32603 is not unique enough 
                     // todo introduce retry limit
                     if (e_1 && e_1.message && (e_1.message.indexOf("Cannot read property 'number' of null") !== -1 ||
                         e_1.message.indexOf('error with payload') !== -1)) {
diff --git a/rollup.config.js b/rollup.config.js
index 078a258..f9003c3 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -19,10 +19,10 @@ export default {
   ],
   external: [
   //   ...Object.keys(pkg.dependencies || {}),
-    ...Object.keys(pkg.peerDependencies || {}),
+    ...Object.keys(pkg.peerDependencies || {})
   ],
   plugins: [
-    resolve(),
+    resolve({preferBuiltins: true}),
     commonjs(),
     json({
       // All JSON files will be parsed by default,
diff --git a/src/Tinlake.ts b/src/Tinlake.ts
index 68d020b..9d27f8a 100644
--- a/src/Tinlake.ts
+++ b/src/Tinlake.ts
@@ -4,6 +4,7 @@ const abiCoder = new AbiCoder();
 import BN from 'bn.js';
 import { sha3 } from 'web3-utils';
 
+
 import contractAbiNft from './abi/test/SimpleNFT.abi.json';
 import contractAbiTitle from './abi/Title.abi.json';
 import contractAbiCurrency from './abi/test/SimpleToken.abi.json';
@@ -91,6 +92,7 @@ interface ethI {
   getTransactionReceipt: (arg0: any, arg1: (err: any, receipt: any) => void) => void;
   getTransactionByHash: (arg0: any, arg1: (err: any, tx: any) => void) => void;
   contract: (arg0: any) => { at: (arg0: any) => void };
+  abi: any;
 }
 
 interface Events {
@@ -269,25 +271,26 @@ export class Tinlake {
   /**
    * @param owner Owner of the new NFT
    */
-  mintNFT = async (owner: string, tokenId: string) => {
-    const tkn = abiCoder.encodeParameter('uint', tokenId)
-    const txHash = await this.contracts.nft.mint(owner, tkn, this.ethConfig);
+  mintNFT = async (owner: string, tokenId: string, ref: string, amount: string, asset:string) => {
+    const txHash = await executeAndRetry(this.contracts.nft.mint, [owner, tokenId, ref, amount, asset, this.ethConfig]);
+    console.log(`[NFT.mint] txHash: ${txHash}`);
     return waitAndReturnEvents(this.eth, txHash, this.contracts['nft'].abi, this.transactionTimeout);
-  }
+  };
+
   /**
    * @param owner Owner of the created loan
    */
   adminAdmit = async (registry: string, nft: string, principal: string, owner: string) => {
     const txHash = await executeAndRetry(this.contracts.admit.admit, [registry, nft, principal, owner, this.ethConfig])
     console.log(`[Admit.admit] txHash: ${txHash}`);
-    return waitAndReturnEvents(this.eth, txHash, this.contracts['nft'].abi, this.transactionTimeout);
+    return waitAndReturnEvents(this.eth, txHash, this.contracts['nft'].abi, this.transactionTimeout); 
   }
 
   adminAppraise = async (loanID: string, appraisal: string) => {
     const txHash = await executeAndRetry(this.contracts.appraiser.file, [loanID, appraisal, this.ethConfig]);
     console.log(`[Appraisal.file] txHash: ${txHash}`);
     return waitAndReturnEvents(this.eth, txHash, this.contracts['nft'].abi, this.transactionTimeout);
-
+      
   }
 
   getAppraisal = async (loanID: string) => {
@@ -308,8 +311,8 @@ export class Tinlake {
    * @param wad Amount which should be repaid
    * @param usr Address that receives the NFT
    */
-  repay = async (loanId: string, wad: string, usr: string)=> {
-    const txHash = await executeAndRetry(this.contracts.reception.repay, [loanId, wad, usr,  this.ethConfig])
+  repay = async (loanId: string, wad: string, usr: string) => {
+    const txHash = await executeAndRetry(this.contracts.reception.repay, [loanId, wad, usr,  this.ethConfig])  
     console.log(`[Reception.repay] txHash: ${txHash}`);
     return waitAndReturnEvents(this.eth, txHash, this.contracts['reception'].abi, this.transactionTimeout);
   }
@@ -365,8 +368,7 @@ export class Tinlake {
    * using initFee
    * @param owner Owner of the created loan
    */
-  whitelist = async (registry: Address, nft: string, principal: string, appraisal: string,
-               fee: string, owner: string) => {
+  whitelist = async (registry: Address, nft: string, principal: string, appraisal: string, fee: string, owner: string) => {
     const txHash = await executeAndRetry(this.contracts.admin.whitelist, [registry, nft, principal, appraisal, fee, owner, this.ethConfig]);
     console.log(`[Admin.whitelist] txHash: ${txHash}`);
     return waitAndReturnEvents(this.eth, txHash, this.contracts['nft'].abi, this.transactionTimeout);
@@ -404,7 +406,7 @@ async function executeAndRetry (f: Function, args: Array<any> = []) : Promise<an
     const result = await f(...args);
     return result;
   } catch (e) {
-    // using error message, since error code -32603 is not unique enough
+    // using error message, since error code -32603 is not unique enough 
     // todo introduce retry limit
     if (e && e.message && (e.message.indexOf("Cannot read property 'number' of null") !== -1 ||
         e.message.indexOf('error with payload')  !== -1)) {
diff --git a/src/abi/test/SimpleNFT.abi.json b/src/abi/test/SimpleNFT.abi.json
index 8bdd860..2b12629 100644
--- a/src/abi/test/SimpleNFT.abi.json
+++ b/src/abi/test/SimpleNFT.abi.json
@@ -1 +1 @@
-[{"constant":true,"inputs":[{"name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"to","type":"address"},{"name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"usr","type":"address"},{"name":"tkn","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"to","type":"address"},{"name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"to","type":"address"},{"name":"tokenId","type":"uint256"},{"name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"owner","type":"address"},{"name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":true,"name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"approved","type":"address"},{"indexed":true,"name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"operator","type":"address"},{"indexed":false,"name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"}]
+[{"constant":true,"inputs":[{"name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"to","type":"address"},{"name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"to","type":"address"},{"name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"to","type":"address"},{"name":"tokenId","type":"uint256"},{"name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"usr","type":"address"},{"name":"tkn","type":"uint256"},{"name":"ref","type":"string"},{"name":"amount","type":"uint256"},{"name":"asset","type":"string"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"owner","type":"address"},{"name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"data","outputs":[{"name":"reference_id","type":"string"},{"name":"amount","type":"uint256"},{"name":"asset_type","type":"string"},{"name":"borrower","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":true,"name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"approved","type":"address"},{"indexed":true,"name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"operator","type":"address"},{"indexed":false,"name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"}]
diff --git a/src/declarations.d.ts b/src/declarations.d.ts
index 19ac77b..15d5f60 100644
--- a/src/declarations.d.ts
+++ b/src/declarations.d.ts
@@ -1,7 +1,7 @@
 declare module '*.abi' {
-  const value: any
-  export default value
+  const value: any;
+  export default value;
 }
 
-declare module 'ethjs'
-declare module 'web3-utils'
+declare module 'ethjs';
+declare module 'web3-utils';