diff --git a/.vscode/launch.json b/.vscode/launch.json
index 40d89a15..329a543c 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -10,13 +10,16 @@
       "name": "Launch Program",
       "runtimeArgs": [
         "-r",
-        "ts-node/register"
+        "ts-node/register/transpile-only"
       ],
       "args": [
         "${workspaceFolder}/src/index.ts"
       ],
       "outputCapture": "std",
-      "internalConsoleOptions": "openOnSessionStart"
+      "internalConsoleOptions": "openOnSessionStart",
+      "env": {
+        "TS_NODE_IGNORE": "none"
+      }
     }
   ]
 }
diff --git a/package-lock.json b/package-lock.json
index 8bfab024..587e4ed5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -68,12 +68,33 @@
         }
       }
     },
+    "@types/bn.js": {
+      "version": "4.11.6",
+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-4.11.6.tgz",
+      "integrity": "sha512-pqr857jrp2kPuO9uRjZ3PwnJTjoQy+fcdxvBTvHm6dkmEL9q+hDD/2j/0ELOBPtPnS8LjCX0gI9nbl8lVkadpg==",
+      "requires": {
+        "@types/node": "*"
+      }
+    },
+    "@types/elliptic": {
+      "version": "6.4.12",
+      "resolved": "https://registry.npmjs.org/@types/elliptic/-/elliptic-6.4.12.tgz",
+      "integrity": "sha512-gP1KsqoouLJGH6IJa28x7PXb3cRqh83X8HCLezd2dF+XcAIMKYv53KV+9Zn6QA561E120uOqZBQ+Jy/cl+fviw==",
+      "requires": {
+        "@types/bn.js": "*"
+      }
+    },
     "@types/eslint-visitor-keys": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
       "integrity": "sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==",
       "dev": true
     },
+    "@types/js-sha512": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/@types/js-sha512/-/js-sha512-0.7.0.tgz",
+      "integrity": "sha512-gPY2v4o+xBinnBDWREx8PzNM1IlHQ0VrP31sxVenRLX56Ssh0IcaQDGzSQBRZxscYYvirDDDsCDNGRcIL7K7Dw=="
+    },
     "@types/json-schema": {
       "version": "7.0.4",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.4.tgz",
@@ -85,6 +106,30 @@
       "resolved": "https://registry.npmjs.org/@types/node/-/node-13.7.4.tgz",
       "integrity": "sha512-oVeL12C6gQS/GAExndigSaLxTrKpQPxewx9bOcwfvJiJge4rr7wNaph4J+ns5hrmIV2as5qxqN8YKthn9qh0jw=="
     },
+    "@types/randombytes": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@types/randombytes/-/randombytes-2.0.0.tgz",
+      "integrity": "sha512-bz8PhAVlwN72vqefzxa14DKNT8jK/mV66CSjwdVQM/k3Th3EPKfUtdMniwZgMedQTFuywAsfjnZsg+pEnltaMA==",
+      "requires": {
+        "@types/node": "*"
+      }
+    },
+    "@types/ripemd160": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@types/ripemd160/-/ripemd160-2.0.0.tgz",
+      "integrity": "sha512-LD6AO/+8cAa1ghXax9NG9iPDLPUEGB2WWPjd//04KYfXxTwHvlDEfL0NRjrM5z9XWBi6WbKw75Are0rDyn3PSA==",
+      "requires": {
+        "@types/node": "*"
+      }
+    },
+    "@types/sha.js": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/@types/sha.js/-/sha.js-2.4.0.tgz",
+      "integrity": "sha512-amxKgPy6WJTKuw8mpUwjX2BSxuBtBmZfRwIUDIuPJKNwGN8CWDli8JTg5ONTWOtcTkHIstvT7oAhhYXqEjStHQ==",
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@typescript-eslint/eslint-plugin": {
       "version": "2.20.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-2.20.0.tgz",
@@ -210,11 +255,29 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
+    "base-x": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/base-x/-/base-x-1.1.0.tgz",
+      "integrity": "sha1-QtPXF0dPnqAiB/bRqh9CaRPut6w="
+    },
+    "base58check": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base58check/-/base58check-2.0.0.tgz",
+      "integrity": "sha1-gEZlLRS8h/BjvRa+lKORNNO2EXM=",
+      "requires": {
+        "bs58": "^3.0.0"
+      }
+    },
     "big-integer": {
       "version": "1.6.48",
       "resolved": "https://registry.npmjs.org/big-integer/-/big-integer-1.6.48.tgz",
       "integrity": "sha512-j51egjPa7/i+RdiRuJbPdJ2FIUYYPhvYLjzoYbcMMm62ooO6F94fETG4MTs46zPAF9Brs04OajboA/qTGuz78w=="
     },
+    "bn.js": {
+      "version": "4.11.8",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
+      "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA=="
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -225,11 +288,33 @@
         "concat-map": "0.0.1"
       }
     },
+    "brorand": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/brorand/-/brorand-1.1.0.tgz",
+      "integrity": "sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8="
+    },
+    "bs58": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/bs58/-/bs58-3.1.0.tgz",
+      "integrity": "sha1-1MJjiL9IBMrHFBQbGUWqR+XrJI4=",
+      "requires": {
+        "base-x": "^1.1.0"
+      }
+    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
       "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A=="
     },
+    "c32check": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/c32check/-/c32check-1.0.1.tgz",
+      "integrity": "sha512-0e1+39uLNLyRm9sNoPUCg38LOELUqiBDZXD9kpUUAFNBq21gY3VaNImp1rfznQOsqK27ArvQ2JaZmfokZznqHg==",
+      "requires": {
+        "base58check": "^2.0.0",
+        "ripemd160": "^2.0.1"
+      }
+    },
     "callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -339,6 +424,20 @@
         "esutils": "^2.0.2"
       }
     },
+    "elliptic": {
+      "version": "6.5.2",
+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.2.tgz",
+      "integrity": "sha512-f4x70okzZbIQl/NSRLkI/+tteV/9WqL98zx+SQ69KbXxmVrmjwsNUPn/gYJJ0sHvEak24cZgHIPegRePAtA/xw==",
+      "requires": {
+        "bn.js": "^4.4.0",
+        "brorand": "^1.0.1",
+        "hash.js": "^1.0.0",
+        "hmac-drbg": "^1.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0",
+        "minimalistic-crypto-utils": "^1.0.0"
+      }
+    },
     "emoji-regex": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
@@ -630,6 +729,34 @@
       "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
       "dev": true
     },
+    "hash-base": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/hash-base/-/hash-base-3.0.4.tgz",
+      "integrity": "sha1-X8hoaEfs1zSZQDMZprCj8/auSRg=",
+      "requires": {
+        "inherits": "^2.0.1",
+        "safe-buffer": "^5.0.1"
+      }
+    },
+    "hash.js": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/hash.js/-/hash.js-1.1.7.tgz",
+      "integrity": "sha512-taOaskGt4z4SOANNseOviYDvjEJinIkRgmp7LbKP2YTTmVxWBl87s/uzK9r+44BclBSp2X7K1hqeNfz9JbBeXA==",
+      "requires": {
+        "inherits": "^2.0.3",
+        "minimalistic-assert": "^1.0.1"
+      }
+    },
+    "hmac-drbg": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/hmac-drbg/-/hmac-drbg-1.0.1.tgz",
+      "integrity": "sha1-0nRXAQJabHdabFRXk+1QL8DGSaE=",
+      "requires": {
+        "hash.js": "^1.0.3",
+        "minimalistic-assert": "^1.0.0",
+        "minimalistic-crypto-utils": "^1.0.1"
+      }
+    },
     "iconv-lite": {
       "version": "0.4.24",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
@@ -674,8 +801,7 @@
     "inherits": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
-      "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
-      "dev": true
+      "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ=="
     },
     "inquirer": {
       "version": "7.0.4",
@@ -737,6 +863,11 @@
       "integrity": "sha1-o6vicYryQaKykE+EpiWXDzia4yo=",
       "dev": true
     },
+    "js-sha512": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/js-sha512/-/js-sha512-0.8.0.tgz",
+      "integrity": "sha512-PWsmefG6Jkodqt+ePTvBZCSMFgN7Clckjd0O7su3I0+BW2QWUTJNzjktHsztGLhncP2h8mcF9V9Y2Ha59pAViQ=="
+    },
     "js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -792,6 +923,16 @@
       "integrity": "sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==",
       "dev": true
     },
+    "minimalistic-assert": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/minimalistic-assert/-/minimalistic-assert-1.0.1.tgz",
+      "integrity": "sha512-UtJcAD4yEaGtjPezWuO9wC4nwUnVH/8/Im3yEHQP4b67cXlD/Qr9hdITCU1xDbSEXg2XKNaP8jsReV7vQd00/A=="
+    },
+    "minimalistic-crypto-utils": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/minimalistic-crypto-utils/-/minimalistic-crypto-utils-1.0.1.tgz",
+      "integrity": "sha1-9sAMHAsIIkblxNmd+4x8CDsrWCo="
+    },
     "minimatch": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
@@ -938,6 +1079,14 @@
       "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
       "dev": true
     },
+    "randombytes": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/randombytes/-/randombytes-2.1.0.tgz",
+      "integrity": "sha512-vYl3iOX+4CKUWuxGi9Ukhie6fsqXqS9FE2Zaic4tNFD2N2QQaXOMFbuKK4QmDHC0JO6B1Zp41J0LpT0oR68amQ==",
+      "requires": {
+        "safe-buffer": "^5.1.0"
+      }
+    },
     "regexpp": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-3.0.0.tgz",
@@ -978,6 +1127,15 @@
         "glob": "^7.1.3"
       }
     },
+    "ripemd160": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/ripemd160/-/ripemd160-2.0.2.tgz",
+      "integrity": "sha512-ii4iagi25WusVoiC4B4lq7pbXfAp3D9v5CwfkY33vffw2+pkDjY1D8GaN7spsxvCSx8dkPqOZCEZyfxcmJG2IA==",
+      "requires": {
+        "hash-base": "^3.0.0",
+        "inherits": "^2.0.1"
+      }
+    },
     "run-async": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.3.0.tgz",
@@ -996,6 +1154,11 @@
         "tslib": "^1.9.0"
       }
     },
+    "safe-buffer": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
+      "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg=="
+    },
     "safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
@@ -1008,6 +1171,15 @@
       "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
       "dev": true
     },
+    "sha.js": {
+      "version": "2.4.11",
+      "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
+      "integrity": "sha512-QMEp5B7cftE7APOjk5Y6xgrbWu+WkLVQwk8JNjZ8nKRciZaByEW6MubieAiToS7+dwvrjGhH8jRXz3MVd0AYqQ==",
+      "requires": {
+        "inherits": "^2.0.1",
+        "safe-buffer": "^5.0.1"
+      }
+    },
     "shebang-command": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
@@ -1073,6 +1245,25 @@
       "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
       "dev": true
     },
+    "stacks-transactions-js": {
+      "version": "github:blockstack/stacks-transactions-js#f9e93e42327d3e4e8f7e24412408a8f25db27e7e",
+      "from": "github:blockstack/stacks-transactions-js#f9e93e4",
+      "requires": {
+        "@types/bn.js": "^4.11.6",
+        "@types/elliptic": "^6.4.12",
+        "@types/js-sha512": "^0.7.0",
+        "@types/randombytes": "^2.0.0",
+        "@types/ripemd160": "^2.0.0",
+        "@types/sha.js": "^2.4.0",
+        "bn.js": "^4.11.8",
+        "c32check": "^1.0.1",
+        "elliptic": "^6.5.2",
+        "js-sha512": "^0.8.0",
+        "randombytes": "^2.1.0",
+        "ripemd160": "^2.0.2",
+        "sha.js": "^2.4.11"
+      }
+    },
     "string-width": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz",
diff --git a/package.json b/package.json
index 9154aaf8..cff585d4 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
     "@types/node": "^13.7.4",
     "big-integer": "^1.6.48",
     "smart-buffer": "^4.1.0",
+    "stacks-transactions-js": "github:blockstack/stacks-transactions-js#f9e93e4",
     "ts-node": "^8.6.2",
     "typescript": "^3.7.5"
   },
diff --git a/src/p2p/tx.ts b/src/p2p/tx.ts
index 8fc6f578..3f5a47ba 100644
--- a/src/p2p/tx.ts
+++ b/src/p2p/tx.ts
@@ -1,6 +1,8 @@
 import { BufferReader } from '../binary-reader';
 import { getEnumDescription } from '../helpers';
 import { StacksMessageParsingError, NotImplementedError } from '../errors';
+import * as clarityUtil from '../../node_modules/stacks-transactions-js/src/clarity/clarityTypes';
+import * as stacksTxUtil from '../../node_modules/stacks-transactions-js/src/utils';
 
 enum SigHashMode {
   /** SingleSigHashMode */
@@ -162,19 +164,14 @@ interface TransactionPostConditionFungible {
   amount: bigint; // u64
 }
 
-// TODO: incomplete
 interface TransactionPostConditionNonfungible {
   assetInfoId: AssetInfoTypeID.NonfungibleAsset; // u8
+  principal: PostConditionPrincipal;
   asset: AssetInfo;
-  assetValue: ClarityValue;
+  assetValue: clarityUtil.ClarityValue;
   conditionCode: NonfungibleConditionCode; // u8
 }
 
-// TODO: placeholder, needs clarity-js / stacks-transactions-js
-interface ClarityValue {
-  value: Buffer; // wrong
-}
-
 type TransactionPostCondition =
   | TransactionPostConditionStx
   | TransactionPostConditionFungible
@@ -200,9 +197,12 @@ interface TransactionPayloadCoinbase {
   payload: Buffer; // 32 bytes
 }
 
-// TODO: incomplete
 interface TransactionPayloadContractCall {
   typeId: TransactionPayloadTypeID.ContractCall;
+  address: StacksAddress;
+  contractName: string;
+  functionName: string;
+  functionArgs: clarityUtil.ClarityValue[];
 }
 
 interface TransactionPayloadSmartContract {
@@ -322,11 +322,39 @@ function readTransactionPayload(reader: BufferReader): TransactionPayload {
       codeBody: readString(reader),
     };
     return payload;
+  } else if (txPayloadType === TransactionPayloadTypeID.ContractCall) {
+    const payload: TransactionPayloadContractCall = {
+      typeId: txPayloadType,
+      address: readStacksAddress(reader),
+      contractName: readContractName(reader),
+      functionName: readClarityName(reader),
+      functionArgs: readClarityValueArray(reader),
+    };
+    return payload;
   } else {
     throw new NotImplementedError(`tx payload type: ${getEnumDescription(TransactionPayloadTypeID, txPayloadType)}`);
   }
 }
 
+function readClarityValue(reader: BufferReader): clarityUtil.ClarityValue {
+  const remainingBuffer = reader.internalBuffer.slice(reader.readOffset);
+  const bufferReader = new stacksTxUtil.BufferReader(remainingBuffer);
+  const clarityVal = clarityUtil.ClarityValue.deserialize(bufferReader);
+  return clarityVal;
+}
+
+function readClarityValueArray(reader: BufferReader): clarityUtil.ClarityValue[] {
+  const valueCount = reader.readUInt32BE();
+  const values = new Array<clarityUtil.ClarityValue>(valueCount);
+  const remainingBuffer = reader.internalBuffer.slice(reader.readOffset);
+  const bufferReader = new stacksTxUtil.BufferReader(remainingBuffer);
+  for (let i = 0; i < valueCount; i++) {
+    const clarityVal = clarityUtil.ClarityValue.deserialize(bufferReader);
+    values[i] = clarityVal;
+  }
+  return values;
+}
+
 function readString(reader: BufferReader): string {
   const length = reader.readUInt32BE();
   const str = reader.readString(length, 'ascii');
@@ -339,6 +367,12 @@ function readContractName(reader: BufferReader): string {
   return name;
 }
 
+function readClarityName(reader: BufferReader): string {
+  const length = reader.readUInt8();
+  const name = reader.readString(length, 'ascii');
+  return name;
+}
+
 function readStacksAddress(reader: BufferReader): StacksAddress {
   const address: StacksAddress = {
     version: reader.readUInt8(),
@@ -347,6 +381,15 @@ function readStacksAddress(reader: BufferReader): StacksAddress {
   return address;
 }
 
+function readAssetInfo(reader: BufferReader): AssetInfo {
+  const assetInfo: AssetInfo = {
+    contractAddress: readStacksAddress(reader),
+    contractName: readContractName(reader),
+    assetName: readClarityName(reader),
+  };
+  return assetInfo;
+}
+
 function readTransactionPostConditions(reader: BufferReader): TransactionPostCondition[] {
   const conditionCount = reader.readUInt32BE();
   const conditions = new Array<TransactionPostCondition>(conditionCount);
@@ -354,16 +397,39 @@ function readTransactionPostConditions(reader: BufferReader): TransactionPostCon
     const typeId = reader.readUInt8Enum(AssetInfoTypeID, n => {
       throw new StacksMessageParsingError(`unexpected tx asset info type: ${n}`);
     });
+    const principal = readTransactionPostConditionPrincipal(reader);
     if (typeId === AssetInfoTypeID.STX) {
-      const principal = readTransactionPostConditionPrincipal(reader);
-      const conditionCode: FungibleConditionCode = reader.readUInt8();
       const condition: TransactionPostConditionStx = {
         assetInfoId: typeId,
         principal: principal,
-        conditionCode: conditionCode,
+        conditionCode: reader.readUInt8Enum(FungibleConditionCode, n => {
+          throw new StacksMessageParsingError(`unexpected condition code: ${n}`);
+        }),
         amount: reader.readBigInt64BE(),
       };
       conditions[i] = condition;
+    } else if (typeId === AssetInfoTypeID.FungibleAsset) {
+      const condition: TransactionPostConditionFungible = {
+        assetInfoId: typeId,
+        principal: principal,
+        asset: readAssetInfo(reader),
+        conditionCode: reader.readUInt8Enum(FungibleConditionCode, n => {
+          throw new StacksMessageParsingError(`unexpected condition code: ${n}`);
+        }),
+        amount: reader.readBigUInt64BE(),
+      };
+      conditions[i] = condition;
+    } else if (typeId === AssetInfoTypeID.NonfungibleAsset) {
+      const condition: TransactionPostConditionNonfungible = {
+        assetInfoId: typeId,
+        principal: principal,
+        asset: readAssetInfo(reader),
+        assetValue: readClarityValue(reader),
+        conditionCode: reader.readUInt8Enum(NonfungibleConditionCode, n => {
+          throw new StacksMessageParsingError(`unexpected nonfungible condition code: ${n}`);
+        }),
+      };
+      conditions[i] = condition;
     } else {
       throw new NotImplementedError(`tx asset info type ${getEnumDescription(AssetInfoTypeID, typeId)}`);
     }
diff --git a/tsconfig.json b/tsconfig.json
index 9504b1ce..0878e6b1 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -8,10 +8,11 @@
     "outDir": "lib",
     "sourceMap": true,
     "sourceRoot": ".",
-    "esModuleInterop": true,
+    "esModuleInterop": false,
     "allowSyntheticDefaultImports": false,
   },
   "include": [
-    "src/**/*"
+    "src/**/*",
+    "node_modules/stacks-transactions-js/src/**/*"
   ]
 }