diff --git a/.gitignore b/.gitignore
index 70a1fab..c251327 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,9 @@
 node_modules/
-# dist/
+dist/
 out/
-# artifacts/
+artifacts/
 **/.env
-# **/scrypt.index.json
+**/scrypt.index.json
 .vscode/*
 !.vscode/launch.json
 !.vscode/tasks.json
diff --git a/artifacts/src/contracts/ordinal-lock.json b/artifacts/src/contracts/ordinal-lock.json
deleted file mode 100644
index ba86739..0000000
--- a/artifacts/src/contracts/ordinal-lock.json
+++ /dev/null
@@ -1,63 +0,0 @@
-{
-    "version": 9,
-    "compilerVersion": "1.19.0+commit.72eaeba",
-    "contract": "OrdinalLock",
-    "md5": "5a1757e1bb8309ab7c73020aee538003",
-    "structs": [],
-    "library": [],
-    "alias": [],
-    "abi": [
-        {
-            "type": "function",
-            "name": "purchase",
-            "index": 0,
-            "params": [
-                {
-                    "name": "selfOutput",
-                    "type": "bytes"
-                },
-                {
-                    "name": "trailingOutputs",
-                    "type": "bytes"
-                },
-                {
-                    "name": "__scrypt_ts_txPreimage",
-                    "type": "SigHashPreimage"
-                }
-            ]
-        },
-        {
-            "type": "function",
-            "name": "cancel",
-            "index": 1,
-            "params": [
-                {
-                    "name": "sig",
-                    "type": "Sig"
-                },
-                {
-                    "name": "pubkey",
-                    "type": "PubKey"
-                }
-            ]
-        },
-        {
-            "type": "constructor",
-            "params": [
-                {
-                    "name": "seller",
-                    "type": "Ripemd160"
-                },
-                {
-                    "name": "payOutput",
-                    "type": "bytes"
-                }
-            ]
-        }
-    ],
-    "stateProps": [],
-    "buildType": "debug",
-    "file": "file:///Users/davidcase/Source/ordinals/ordinal-lock/artifacts/src/contracts/ordinal-lock.scrypt",
-    "hex": "2097dfd76851bf465e8f715593b217714858bbe9570ff3bd5e33840a34e20ff0262102ba79df5f8ae7604a9830f03c7933028186aede0675a16f025dc4f8be8eec0382201008ce7480da41702918d1ec8e6849ba32b4d65b1e40dc669c31a1e6306b266c0000<seller><payOutput>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",
-    "sourceMapFile": "file:///var/folders/2v/014041p126bgrcjspgbn0tgw0000gn/T/scrypt-ts-UeM3Oe/ordinal-lock.map.json"
-}
\ No newline at end of file
diff --git a/artifacts/src/contracts/ordinal-lock.scrypt b/artifacts/src/contracts/ordinal-lock.scrypt
deleted file mode 100644
index 6c7d150..0000000
--- a/artifacts/src/contracts/ordinal-lock.scrypt
+++ /dev/null
@@ -1,17 +0,0 @@
-
-contract OrdinalLock {
-  Ripemd160 seller;
-  bytes payOutput;
-  constructor(Ripemd160 seller, bytes payOutput) {
-    this.seller = seller;
-    this.payOutput = payOutput;
-  }
-  public function purchase(bytes selfOutput, bytes trailingOutputs, SigHashPreimage __scrypt_ts_txPreimage) {
-    require(Tx.checkPreimageSigHashType(__scrypt_ts_txPreimage, SigHashType(b'c1')));
-    require(hash256(selfOutput + this.payOutput + trailingOutputs) == SigHash.hashOutputs(__scrypt_ts_txPreimage));
-  }
-  public function cancel(Sig sig, PubKey pubkey) {
-    require(this.seller == hash160(pubkey));
-    require(checkSig(sig, pubkey));
-  }
-}
\ No newline at end of file
diff --git a/artifacts/src/contracts/ordinal-lock.scrypt.map b/artifacts/src/contracts/ordinal-lock.scrypt.map
deleted file mode 100644
index fca404f..0000000
--- a/artifacts/src/contracts/ordinal-lock.scrypt.map
+++ /dev/null
@@ -1 +0,0 @@
-[[],[[9,0,14,13]],[[2,0,16,12],[12,0,16,4]],[[2,0,19,15],[8,0,19,4]],[[2,0,21,4],[14,0,21,24],[24,0,21,16],[32,0,21,47],[38,0,21,36]],[[4,0,24,8],[8,0,24,13],[16,0,24,8],[18,0,24,22]],[[4,0,25,8],[8,0,25,13],[19,0,25,8],[21,0,25,25]],[],[[2,0,29,4],[18,0,29,11],[27,0,29,32],[33,0,29,20],[45,0,29,61],[51,0,29,44]],[],[[4,0,30,8],[12,0,30,15],[20,0,30,23],[31,0,30,23],[33,0,30,36],[37,0,30,41],[48,0,30,23],[50,0,30,53],[67,0,30,15],[77,0,30,82]],[],[[2,0,34,4],[18,0,34,11],[25,0,34,23],[29,0,34,18],[34,0,34,36],[41,0,34,28]],[[4,0,35,8],[12,0,35,15],[16,0,35,20],[24,0,35,15],[27,0,35,30],[35,0,35,38]],[[4,0,36,8],[12,0,36,20],[20,0,36,15],[21,0,36,29],[26,0,36,34],[32,0,36,15]],[],[]]
\ No newline at end of file
diff --git a/artifacts/src/contracts/ordinal-lock.transformer.json b/artifacts/src/contracts/ordinal-lock.transformer.json
deleted file mode 100644
index 1a08d71..0000000
--- a/artifacts/src/contracts/ordinal-lock.transformer.json
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "success": true,
-  "errors": [],
-  "scryptfile": "src/contracts/ordinal-lock.scrypt",
-  "sourceMapFile": "src/contracts/ordinal-lock.scrypt.map",
-  "ctxMethods": [
-    "purchase"
-  ]
-}
\ No newline at end of file
diff --git a/dist/src/contracts/ordinal-lock.js b/dist/src/contracts/ordinal-lock.js
deleted file mode 100644
index f1dc161..0000000
--- a/dist/src/contracts/ordinal-lock.js
+++ /dev/null
@@ -1,38 +0,0 @@
-"use strict";
-var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
-    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
-    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
-    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
-    return c > 3 && r && Object.defineProperty(target, key, r), r;
-};
-Object.defineProperty(exports, "__esModule", { value: true });
-exports.OrdinalLock = void 0;
-const scrypt_ts_1 = require("scrypt-ts");
-class OrdinalLock extends scrypt_ts_1.SmartContract {
-    constructor(seller, payOutput) {
-        super(...arguments);
-        this.seller = seller;
-        this.payOutput = payOutput;
-    }
-    purchase(selfOutput, trailingOutputs) {
-        (0, scrypt_ts_1.assert)((0, scrypt_ts_1.hash256)(selfOutput + this.payOutput + trailingOutputs) == this.ctx.hashOutputs);
-    }
-    cancel(sig, pubkey) {
-        (0, scrypt_ts_1.assert)(this.seller == (0, scrypt_ts_1.hash160)(pubkey), 'bad seller');
-        (0, scrypt_ts_1.assert)(this.checkSig(sig, pubkey), 'signature check failed');
-    }
-}
-__decorate([
-    (0, scrypt_ts_1.prop)()
-], OrdinalLock.prototype, "seller", void 0);
-__decorate([
-    (0, scrypt_ts_1.prop)()
-], OrdinalLock.prototype, "payOutput", void 0);
-__decorate([
-    (0, scrypt_ts_1.method)(scrypt_ts_1.SigHash.ANYONECANPAY_ALL)
-], OrdinalLock.prototype, "purchase", null);
-__decorate([
-    (0, scrypt_ts_1.method)()
-], OrdinalLock.prototype, "cancel", null);
-exports.OrdinalLock = OrdinalLock;
-//# sourceMappingURL=ordinal-lock.js.map
\ No newline at end of file
diff --git a/dist/src/contracts/ordinal-lock.js.map b/dist/src/contracts/ordinal-lock.js.map
deleted file mode 100644
index 07addf4..0000000
--- a/dist/src/contracts/ordinal-lock.js.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"ordinal-lock.js","sourceRoot":"","sources":["../../../src/contracts/ordinal-lock.ts"],"names":[],"mappings":";;;;;;;;;AAAA,yCAYkB;AAElB,MAAa,WAAY,SAAQ,yBAAa;IAO1C,YAAY,MAAkB,EAAE,SAAqB;QACjD,KAAK,CAAC,GAAG,SAAS,CAAC,CAAA;QAEnB,IAAI,CAAC,MAAM,GAAG,MAAM,CAAC;QACrB,IAAI,CAAC,SAAS,GAAG,SAAS,CAAC;IAC/B,CAAC;IAGM,QAAQ,CAAC,UAAsB,EAAE,eAA2B;QAC/D,IAAA,kBAAM,EAAC,IAAA,mBAAO,EAAC,UAAU,GAAG,IAAI,CAAC,SAAS,GAAG,eAAe,CAAC,IAAI,IAAI,CAAC,GAAG,CAAC,WAAW,CAAC,CAAA;IAC1F,CAAC;IAGM,MAAM,CAAC,GAAQ,EAAE,MAAc;QAClC,IAAA,kBAAM,EAAC,IAAI,CAAC,MAAM,IAAI,IAAA,mBAAO,EAAC,MAAM,CAAC,EAAE,YAAY,CAAC,CAAA;QACpD,IAAA,kBAAM,EAAC,IAAI,CAAC,QAAQ,CAAC,GAAG,EAAE,MAAM,CAAC,EAAE,wBAAwB,CAAC,CAAA;IAChE,CAAC;CACJ;AAtBG;IADC,IAAA,gBAAI,GAAE;2CACW;AAGlB;IADC,IAAA,gBAAI,GAAE;8CACc;AAUrB;IADC,IAAA,kBAAM,EAAC,mBAAO,CAAC,gBAAgB,CAAC;2CAGhC;AAGD;IADC,IAAA,kBAAM,GAAE;yCAIR;AAvBL,kCAwBC"}
\ No newline at end of file
diff --git a/dist/tests/local/ordinal-lock.test.js b/dist/tests/local/ordinal-lock.test.js
deleted file mode 100644
index bb3d33e..0000000
--- a/dist/tests/local/ordinal-lock.test.js
+++ /dev/null
@@ -1,80 +0,0 @@
-"use strict";
-var __importDefault = (this && this.__importDefault) || function (mod) {
-    return (mod && mod.__esModule) ? mod : { "default": mod };
-};
-Object.defineProperty(exports, "__esModule", { value: true });
-const chai_1 = require("chai");
-const scrypt_ts_1 = require("scrypt-ts");
-const ordinal_lock_1 = require("../../src/contracts/ordinal-lock");
-const txHelper_1 = require("./utils/txHelper");
-const chai_as_promised_1 = __importDefault(require("chai-as-promised"));
-(0, chai_1.use)(chai_as_promised_1.default);
-const [sellerPriv, sellerPub, sellerPKH, sellerAdd] = (0, txHelper_1.randomPrivateKey)();
-const [badPriv, badPub, badPKH, badAdd] = (0, txHelper_1.randomPrivateKey)();
-describe('Test SmartContract `OrdinalLock`', () => {
-    let instance;
-    const payOut = new scrypt_ts_1.bsv.Transaction.Output({
-        script: scrypt_ts_1.bsv.Script.fromAddress(sellerAdd),
-        satoshis: 1000,
-    })
-        .toBufferWriter()
-        .toBuffer();
-    let deployTx;
-    before(async () => {
-        await ordinal_lock_1.OrdinalLock.compile();
-        instance = new ordinal_lock_1.OrdinalLock((0, scrypt_ts_1.Ripemd160)(sellerPKH.toString('hex')), payOut.toString('hex'));
-        // instance.bindTxBuilder('purchase', OrdinalLock.purchaseTxBuilder)
-        await instance.connect((0, txHelper_1.getDummySigner)([sellerPriv]));
-        deployTx = await instance.deploy(1);
-        console.log('OrdinalLock contract deployed: ', deployTx.id);
-    });
-    it('should pass the cancel method unit test successfully.', async () => {
-        const { tx: callTx, atInputIndex } = await instance.methods.cancel((sigResps) => (0, scrypt_ts_1.findSig)(sigResps, sellerPub), (0, scrypt_ts_1.PubKey)(sellerPub.toString()), {
-            pubKeyOrAddrToSign: [sellerPub],
-        });
-        const result = callTx.verifyScript(atInputIndex);
-        (0, chai_1.expect)(result.success, result.error).to.eq(true);
-    });
-    it('should fail the cancel method unit test with bad seller.', async () => {
-        (0, chai_1.expect)(instance.methods.cancel((sigResps) => (0, scrypt_ts_1.findSig)(sigResps, sellerPub), (0, scrypt_ts_1.PubKey)(badPub.toString()), {
-            pubKeyOrAddrToSign: [sellerPub],
-        })).to.be.rejectedWith('bad seller');
-    });
-    it('should fail the cancel method unit test with signature check failed.', async () => {
-        (0, chai_1.expect)(instance.methods.cancel((sigResps) => (0, scrypt_ts_1.findSig)(sigResps, badPub), (0, scrypt_ts_1.PubKey)(sellerPub.toString()), {
-            pubKeyOrAddrToSign: [badPub],
-        })).to.be.rejectedWith('signature check failed');
-    });
-    it('should pass the purchase method unit test successfully.', async () => {
-        const tx = new scrypt_ts_1.bsv.Transaction()
-            .addOutput(new scrypt_ts_1.bsv.Transaction.Output({
-            script: new scrypt_ts_1.bsv.Script(sellerAdd),
-            satoshis: instance.balance,
-        }))
-            //         // build payment output
-            .addOutput(scrypt_ts_1.bsv.Transaction.Output.fromBufferReader(new scrypt_ts_1.bsv.encoding.BufferReader(Buffer.from(instance.payOutput, 'hex'))))
-            //         // add contract input
-            .from({
-            txId: deployTx.id,
-            outputIndex: 0,
-            script: deployTx.outputs[0].script.toString(),
-            satoshis: deployTx.outputs[0].satoshis,
-        });
-        // const asm = `${tx.outputs[0].toBufferWriter().toBuffer().toString('hex')} OP_0 ${tx.getPreimage(0, 0xc1, false)} OP_0`
-        // const preimage = tx.pre
-        const script = scrypt_ts_1.bsv.Script.fromBuffer(Buffer.alloc(0))
-            .add(tx.outputs[0].toBufferWriter().toBuffer())
-            .add(scrypt_ts_1.bsv.Opcode.OP_0)
-            .add(scrypt_ts_1.bsv.Transaction.Sighash.sighashPreimage(tx, 0xc1, 0, deployTx.outputs[0].script, new scrypt_ts_1.bsv.crypto.BN(deployTx.outputs[0].satoshis), 0x40))
-            .add(scrypt_ts_1.bsv.Opcode.OP_0);
-        tx.inputs[0].setScript(script);
-        // console.log('Tx: ', JSON.stringify(tx))
-        const result = tx.verifyScript(0);
-        (0, chai_1.expect)(result.success, result.error).to.eq(true);
-    });
-    it('should fail the purchase method unit test bad payOut.', async () => {
-        const badScript = scrypt_ts_1.bsv.Script.fromAddress(badAdd).toHex();
-        (0, chai_1.expect)(instance.methods.purchase(badScript, {})).to.be.rejectedWith('bad self output');
-    });
-});
-//# sourceMappingURL=ordinal-lock.test.js.map
\ No newline at end of file
diff --git a/dist/tests/local/ordinal-lock.test.js.map b/dist/tests/local/ordinal-lock.test.js.map
deleted file mode 100644
index 3753e87..0000000
--- a/dist/tests/local/ordinal-lock.test.js.map
+++ /dev/null
@@ -1 +0,0 @@
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\ No newline at end of file
diff --git a/dist/tests/local/utils/txHelper.js b/dist/tests/local/utils/txHelper.js
deleted file mode 100644
index 5616e2e..0000000
--- a/dist/tests/local/utils/txHelper.js
+++ /dev/null
@@ -1,37 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-exports.randomPrivateKey = exports.getDummyUTXO = exports.getDummySigner = exports.dummyUTXO = exports.inputIndex = exports.inputSatoshis = void 0;
-const crypto_1 = require("crypto");
-const scrypt_ts_1 = require("scrypt-ts");
-const privateKey_1 = require("../../utils/privateKey");
-exports.inputSatoshis = 10000;
-exports.inputIndex = 0;
-exports.dummyUTXO = {
-    txId: (0, crypto_1.randomBytes)(32).toString('hex'),
-    outputIndex: 0,
-    script: '',
-    satoshis: exports.inputSatoshis,
-};
-function getDummySigner(privateKey) {
-    if (global.dummySigner === undefined) {
-        global.dummySigner = new scrypt_ts_1.TestWallet(privateKey_1.myPrivateKey, new scrypt_ts_1.DummyProvider());
-    }
-    if (privateKey !== undefined) {
-        global.dummySigner.addPrivateKey(privateKey);
-    }
-    return global.dummySigner;
-}
-exports.getDummySigner = getDummySigner;
-function getDummyUTXO(satoshis = exports.inputSatoshis) {
-    return Object.assign({}, exports.dummyUTXO, { satoshis });
-}
-exports.getDummyUTXO = getDummyUTXO;
-function randomPrivateKey() {
-    const privateKey = scrypt_ts_1.bsv.PrivateKey.fromRandom('testnet');
-    const publicKey = scrypt_ts_1.bsv.PublicKey.fromPrivateKey(privateKey);
-    const publicKeyHash = scrypt_ts_1.bsv.crypto.Hash.sha256ripemd160(publicKey.toBuffer());
-    const address = publicKey.toAddress();
-    return [privateKey, publicKey, publicKeyHash, address];
-}
-exports.randomPrivateKey = randomPrivateKey;
-//# sourceMappingURL=txHelper.js.map
\ No newline at end of file
diff --git a/dist/tests/local/utils/txHelper.js.map b/dist/tests/local/utils/txHelper.js.map
deleted file mode 100644
index 8411dff..0000000
--- a/dist/tests/local/utils/txHelper.js.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"txHelper.js","sourceRoot":"","sources":["../../../../tests/local/utils/txHelper.ts"],"names":[],"mappings":";;;AAAA,mCAAoC;AACpC,yCAAgE;AAChE,uDAAqD;AAExC,QAAA,aAAa,GAAG,KAAK,CAAA;AAErB,QAAA,UAAU,GAAG,CAAC,CAAA;AAEd,QAAA,SAAS,GAAG;IACrB,IAAI,EAAE,IAAA,oBAAW,EAAC,EAAE,CAAC,CAAC,QAAQ,CAAC,KAAK,CAAC;IACrC,WAAW,EAAE,CAAC;IACd,MAAM,EAAE,EAAE;IACV,QAAQ,EAAE,qBAAa;CAC1B,CAAA;AAED,SAAgB,cAAc,CAC1B,UAA8C;IAE9C,IAAI,MAAM,CAAC,WAAW,KAAK,SAAS,EAAE;QAClC,MAAM,CAAC,WAAW,GAAG,IAAI,sBAAU,CAAC,yBAAY,EAAE,IAAI,yBAAa,EAAE,CAAC,CAAA;KACzE;IACD,IAAI,UAAU,KAAK,SAAS,EAAE;QAC1B,MAAM,CAAC,WAAW,CAAC,aAAa,CAAC,UAAU,CAAC,CAAA;KAC/C;IACD,OAAO,MAAM,CAAC,WAAW,CAAA;AAC7B,CAAC;AAVD,wCAUC;AAED,SAAgB,YAAY,CAAC,WAAmB,qBAAa;IACzD,OAAO,MAAM,CAAC,MAAM,CAAC,EAAE,EAAE,iBAAS,EAAE,EAAE,QAAQ,EAAE,CAAC,CAAA;AACrD,CAAC;AAFD,oCAEC;AAED,SAAgB,gBAAgB;IAC5B,MAAM,UAAU,GAAG,eAAG,CAAC,UAAU,CAAC,UAAU,CAAC,SAAS,CAAC,CAAA;IACvD,MAAM,SAAS,GAAG,eAAG,CAAC,SAAS,CAAC,cAAc,CAAC,UAAU,CAAC,CAAA;IAC1D,MAAM,aAAa,GAAG,eAAG,CAAC,MAAM,CAAC,IAAI,CAAC,eAAe,CAAC,SAAS,CAAC,QAAQ,EAAE,CAAC,CAAA;IAC3E,MAAM,OAAO,GAAG,SAAS,CAAC,SAAS,EAAE,CAAA;IACrC,OAAO,CAAC,UAAU,EAAE,SAAS,EAAE,aAAa,EAAE,OAAO,CAAU,CAAA;AACnE,CAAC;AAND,4CAMC"}
\ No newline at end of file
diff --git a/dist/tests/testnet/ordinal-lock.js b/dist/tests/testnet/ordinal-lock.js
deleted file mode 100644
index b633ae7..0000000
--- a/dist/tests/testnet/ordinal-lock.js
+++ /dev/null
@@ -1,44 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-const ordinal_lock_1 = require("../../src/contracts/ordinal-lock");
-const txHelper_1 = require("./utils/txHelper");
-const scrypt_ts_1 = require("scrypt-ts");
-const privateKey_1 = require("../utils/privateKey");
-const payScript = scrypt_ts_1.bsv.Script.fromAddress(privateKey_1.myAddress);
-// const paySats = 1000n
-const payOut = new scrypt_ts_1.bsv.Transaction.Output({
-    script: payScript,
-    satoshis: 1000,
-})
-    .toBufferWriter()
-    .toBuffer();
-async function main() {
-    await ordinal_lock_1.OrdinalLock.compile();
-    let instance = new ordinal_lock_1.OrdinalLock((0, scrypt_ts_1.Ripemd160)(privateKey_1.myPublicKeyHash.toString('hex')), payOut.toString('hex'));
-    await instance.connect((0, txHelper_1.getDefaultSigner)(privateKey_1.myPrivateKey));
-    // instance.bindTxBuilder('purchase', OrdinalLock.purchaseTxBuilder)
-    // contract deployment
-    let deployTx = await instance.deploy(1);
-    console.log('OrdinalLock contract deployed: ', deployTx.id);
-    // contract call
-    const { tx: cancelTx } = await instance.methods.cancel((sigResps) => (0, scrypt_ts_1.findSig)(sigResps, privateKey_1.myPublicKey), (0, scrypt_ts_1.PubKey)(privateKey_1.myPublicKey.toString()), {
-        pubKeyOrAddrToSign: [privateKey_1.myPublicKey],
-    });
-    console.log('OrdinalLock contract `cancel` called: ', cancelTx.id);
-    instance = new ordinal_lock_1.OrdinalLock((0, scrypt_ts_1.Ripemd160)(privateKey_1.myPublicKeyHash.toString('hex')), payOut.toString('hex'));
-    await instance.connect((0, txHelper_1.getDefaultSigner)(privateKey_1.myPrivateKey));
-    // instance.bindTxBuilder('purchase', OrdinalLock.purchaseTxBuilder)
-    // contract deployment
-    deployTx = await instance.deploy(1);
-    console.log('OrdinalLock contract deployed: ', deployTx.id);
-    const { tx: purchaseTx } = await instance.methods.purchase(payScript, {
-        changeAddress: privateKey_1.myAddress,
-    });
-    console.log('OrdinalLock contract `purchase` called: ', purchaseTx.id);
-}
-describe('Test SmartContract `OrdinalLock` on testnet', () => {
-    it('should succeed', async () => {
-        await main();
-    });
-});
-//# sourceMappingURL=ordinal-lock.js.map
\ No newline at end of file
diff --git a/dist/tests/testnet/ordinal-lock.js.map b/dist/tests/testnet/ordinal-lock.js.map
deleted file mode 100644
index af91464..0000000
--- a/dist/tests/testnet/ordinal-lock.js.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"ordinal-lock.js","sourceRoot":"","sources":["../../../tests/testnet/ordinal-lock.ts"],"names":[],"mappings":";;AAAA,mEAA8D;AAC9D,+CAAmD;AACnD,yCAA8E;AAC9E,oDAK4B;AAE5B,MAAM,SAAS,GAAG,eAAG,CAAC,MAAM,CAAC,WAAW,CAAC,sBAAS,CAAC,CAAA;AACnD,wBAAwB;AACxB,MAAM,MAAM,GAAG,IAAI,eAAG,CAAC,WAAW,CAAC,MAAM,CAAC;IACtC,MAAM,EAAE,SAAS;IACjB,QAAQ,EAAE,IAAI;CACjB,CAAC;KACG,cAAc,EAAE;KAChB,QAAQ,EAAE,CAAA;AAEf,KAAK,UAAU,IAAI;IACf,MAAM,0BAAW,CAAC,OAAO,EAAE,CAAA;IAC3B,IAAI,QAAQ,GAAG,IAAI,0BAAW,CAC1B,IAAA,qBAAS,EAAC,4BAAe,CAAC,QAAQ,CAAC,KAAK,CAAC,CAAC,EAC1C,MAAM,CAAC,QAAQ,CAAC,KAAK,CAAC,CACzB,CAAA;IACD,MAAM,QAAQ,CAAC,OAAO,CAAC,IAAA,2BAAgB,EAAC,yBAAY,CAAC,CAAC,CAAA;IAEtD,oEAAoE;IAEpE,sBAAsB;IACtB,IAAI,QAAQ,GAAG,MAAM,QAAQ,CAAC,MAAM,CAAC,CAAC,CAAC,CAAA;IACvC,OAAO,CAAC,GAAG,CAAC,iCAAiC,EAAE,QAAQ,CAAC,EAAE,CAAC,CAAA;IAE3D,gBAAgB;IAChB,MAAM,EAAE,EAAE,EAAE,QAAQ,EAAE,GAAG,MAAM,QAAQ,CAAC,OAAO,CAAC,MAAM,CAClD,CAAC,QAAQ,EAAE,EAAE,CAAC,IAAA,mBAAO,EAAC,QAAQ,EAAE,wBAAW,CAAC,EAC5C,IAAA,kBAAM,EAAC,wBAAW,CAAC,QAAQ,EAAE,CAAC,EAC9B;QACI,kBAAkB,EAAE,CAAC,wBAAW,CAAC;KACF,CACtC,CAAA;IACD,OAAO,CAAC,GAAG,CAAC,wCAAwC,EAAE,QAAQ,CAAC,EAAE,CAAC,CAAA;IAElE,QAAQ,GAAG,IAAI,0BAAW,CACtB,IAAA,qBAAS,EAAC,4BAAe,CAAC,QAAQ,CAAC,KAAK,CAAC,CAAC,EAC1C,MAAM,CAAC,QAAQ,CAAC,KAAK,CAAC,CACzB,CAAA;IACD,MAAM,QAAQ,CAAC,OAAO,CAAC,IAAA,2BAAgB,EAAC,yBAAY,CAAC,CAAC,CAAA;IACtD,oEAAoE;IAEpE,sBAAsB;IACtB,QAAQ,GAAG,MAAM,QAAQ,CAAC,MAAM,CAAC,CAAC,CAAC,CAAA;IACnC,OAAO,CAAC,GAAG,CAAC,iCAAiC,EAAE,QAAQ,CAAC,EAAE,CAAC,CAAA;IAE3D,MAAM,EAAE,EAAE,EAAE,UAAU,EAAE,GAAG,MAAM,QAAQ,CAAC,OAAO,CAAC,QAAQ,CAAC,SAAS,EAAE;QAClE,aAAa,EAAE,sBAAS;KACO,CAAC,CAAA;IAEpC,OAAO,CAAC,GAAG,CAAC,0CAA0C,EAAE,UAAU,CAAC,EAAE,CAAC,CAAA;AAC1E,CAAC;AAED,QAAQ,CAAC,6CAA6C,EAAE,GAAG,EAAE;IACzD,EAAE,CAAC,gBAAgB,EAAE,KAAK,IAAI,EAAE;QAC5B,MAAM,IAAI,EAAE,CAAA;IAChB,CAAC,CAAC,CAAA;AACN,CAAC,CAAC,CAAA"}
\ No newline at end of file
diff --git a/dist/tests/testnet/utils/txHelper.js b/dist/tests/testnet/utils/txHelper.js
deleted file mode 100644
index 6702e32..0000000
--- a/dist/tests/testnet/utils/txHelper.js
+++ /dev/null
@@ -1,33 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-exports.getDefaultSigner = exports.randomPrivateKey = exports.sleep = exports.inputSatoshis = void 0;
-const privateKey_1 = require("../../utils/privateKey");
-const scrypt_ts_1 = require("scrypt-ts");
-exports.inputSatoshis = 10000;
-const sleep = async (seconds) => {
-    return new Promise((resolve) => {
-        setTimeout(() => {
-            resolve({});
-        }, seconds * 1000);
-    });
-};
-exports.sleep = sleep;
-function randomPrivateKey() {
-    const privateKey = scrypt_ts_1.bsv.PrivateKey.fromRandom('testnet');
-    const publicKey = scrypt_ts_1.bsv.PublicKey.fromPrivateKey(privateKey);
-    const publicKeyHash = scrypt_ts_1.bsv.crypto.Hash.sha256ripemd160(publicKey.toBuffer());
-    const address = publicKey.toAddress();
-    return [privateKey, publicKey, publicKeyHash, address];
-}
-exports.randomPrivateKey = randomPrivateKey;
-function getDefaultSigner(privateKey) {
-    if (global.testnetSigner === undefined) {
-        global.testnetSigner = new scrypt_ts_1.TestWallet(privateKey_1.myPrivateKey, new scrypt_ts_1.DefaultProvider());
-    }
-    if (privateKey !== undefined) {
-        global.testnetSigner.addPrivateKey(privateKey);
-    }
-    return global.testnetSigner;
-}
-exports.getDefaultSigner = getDefaultSigner;
-//# sourceMappingURL=txHelper.js.map
\ No newline at end of file
diff --git a/dist/tests/testnet/utils/txHelper.js.map b/dist/tests/testnet/utils/txHelper.js.map
deleted file mode 100644
index 026a545..0000000
--- a/dist/tests/testnet/utils/txHelper.js.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"txHelper.js","sourceRoot":"","sources":["../../../../tests/testnet/utils/txHelper.ts"],"names":[],"mappings":";;;AAAA,uDAAqD;AACrD,yCAA4D;AAE/C,QAAA,aAAa,GAAG,KAAK,CAAA;AAE3B,MAAM,KAAK,GAAG,KAAK,EAAE,OAAe,EAAE,EAAE;IAC3C,OAAO,IAAI,OAAO,CAAC,CAAC,OAAO,EAAE,EAAE;QAC3B,UAAU,CAAC,GAAG,EAAE;YACZ,OAAO,CAAC,EAAE,CAAC,CAAA;QACf,CAAC,EAAE,OAAO,GAAG,IAAI,CAAC,CAAA;IACtB,CAAC,CAAC,CAAA;AACN,CAAC,CAAA;AANY,QAAA,KAAK,SAMjB;AAED,SAAgB,gBAAgB;IAC5B,MAAM,UAAU,GAAG,eAAG,CAAC,UAAU,CAAC,UAAU,CAAC,SAAS,CAAC,CAAA;IACvD,MAAM,SAAS,GAAG,eAAG,CAAC,SAAS,CAAC,cAAc,CAAC,UAAU,CAAC,CAAA;IAC1D,MAAM,aAAa,GAAG,eAAG,CAAC,MAAM,CAAC,IAAI,CAAC,eAAe,CAAC,SAAS,CAAC,QAAQ,EAAE,CAAC,CAAA;IAC3E,MAAM,OAAO,GAAG,SAAS,CAAC,SAAS,EAAE,CAAA;IACrC,OAAO,CAAC,UAAU,EAAE,SAAS,EAAE,aAAa,EAAE,OAAO,CAAU,CAAA;AACnE,CAAC;AAND,4CAMC;AAED,SAAgB,gBAAgB,CAC5B,UAA8C;IAE9C,IAAI,MAAM,CAAC,aAAa,KAAK,SAAS,EAAE;QACpC,MAAM,CAAC,aAAa,GAAG,IAAI,sBAAU,CACjC,yBAAY,EACZ,IAAI,2BAAe,EAAE,CACxB,CAAA;KACJ;IACD,IAAI,UAAU,KAAK,SAAS,EAAE;QAC1B,MAAM,CAAC,aAAa,CAAC,aAAa,CAAC,UAAU,CAAC,CAAA;KACjD;IACD,OAAO,MAAM,CAAC,aAAa,CAAA;AAC/B,CAAC;AAbD,4CAaC"}
\ No newline at end of file
diff --git a/dist/tests/utils/privateKey.js b/dist/tests/utils/privateKey.js
deleted file mode 100644
index f53ec41..0000000
--- a/dist/tests/utils/privateKey.js
+++ /dev/null
@@ -1,59 +0,0 @@
-"use strict";
-var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
-    if (k2 === undefined) k2 = k;
-    var desc = Object.getOwnPropertyDescriptor(m, k);
-    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
-      desc = { enumerable: true, get: function() { return m[k]; } };
-    }
-    Object.defineProperty(o, k2, desc);
-}) : (function(o, m, k, k2) {
-    if (k2 === undefined) k2 = k;
-    o[k2] = m[k];
-}));
-var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
-    Object.defineProperty(o, "default", { enumerable: true, value: v });
-}) : function(o, v) {
-    o["default"] = v;
-});
-var __importStar = (this && this.__importStar) || function (mod) {
-    if (mod && mod.__esModule) return mod;
-    var result = {};
-    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
-    __setModuleDefault(result, mod);
-    return result;
-};
-Object.defineProperty(exports, "__esModule", { value: true });
-exports.myAddress = exports.myPublicKeyHash = exports.myPublicKey = exports.myPrivateKey = exports.showAddr = exports.genPrivKey = void 0;
-const scrypt_ts_1 = require("scrypt-ts");
-const dotenv = __importStar(require("dotenv"));
-const fs = __importStar(require("fs"));
-const dotenvConfigPath = '.env';
-dotenv.config({ path: dotenvConfigPath });
-// fill in private key on testnet in WIF here
-let privKey = process.env.PRIVATE_KEY;
-if (!privKey) {
-    genPrivKey();
-}
-else {
-    showAddr(scrypt_ts_1.bsv.PrivateKey.fromWIF(privKey));
-}
-function genPrivKey() {
-    const newPrivKey = scrypt_ts_1.bsv.PrivateKey.fromRandom('testnet');
-    console.log(`Missing private key, generating a new one ...
-Private key generated: '${newPrivKey.toWIF()}'
-You can fund its address '${newPrivKey.toAddress()}' from the sCrypt faucet https://scrypt.io/faucet`);
-    // auto generate .env file with new generated key
-    fs.writeFileSync(dotenvConfigPath, `PRIVATE_KEY="${newPrivKey}"`);
-    privKey = newPrivKey.toWIF();
-}
-exports.genPrivKey = genPrivKey;
-function showAddr(privKey) {
-    console.log(`Private key already present ...
-You can fund its address '${privKey.toAddress()}' from the sCrypt faucet https://scrypt.io/faucet`);
-}
-exports.showAddr = showAddr;
-exports.myPrivateKey = scrypt_ts_1.bsv.PrivateKey.fromWIF(privKey);
-exports.myPublicKey = scrypt_ts_1.bsv.PublicKey.fromPrivateKey(exports.myPrivateKey);
-exports.myPublicKeyHash = scrypt_ts_1.bsv.crypto.Hash.sha256ripemd160(exports.myPublicKey.toBuffer());
-exports.myAddress = exports.myPublicKey.toAddress();
-//# sourceMappingURL=privateKey.js.map
\ No newline at end of file
diff --git a/dist/tests/utils/privateKey.js.map b/dist/tests/utils/privateKey.js.map
deleted file mode 100644
index 4fbd284..0000000
--- a/dist/tests/utils/privateKey.js.map
+++ /dev/null
@@ -1 +0,0 @@
-{"version":3,"file":"privateKey.js","sourceRoot":"","sources":["../../../tests/utils/privateKey.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;;AAAA,yCAA+B;AAC/B,+CAAgC;AAChC,uCAAwB;AAExB,MAAM,gBAAgB,GAAG,MAAM,CAAA;AAC/B,MAAM,CAAC,MAAM,CAAC,EAAE,IAAI,EAAE,gBAAgB,EAAE,CAAC,CAAA;AAEzC,6CAA6C;AAC7C,IAAI,OAAO,GAAG,OAAO,CAAC,GAAG,CAAC,WAAW,CAAA;AACrC,IAAI,CAAC,OAAO,EAAE;IACV,UAAU,EAAE,CAAA;CACf;KAAM;IACH,QAAQ,CAAC,eAAG,CAAC,UAAU,CAAC,OAAO,CAAC,OAAO,CAAC,CAAC,CAAA;CAC5C;AAED,SAAgB,UAAU;IACtB,MAAM,UAAU,GAAG,eAAG,CAAC,UAAU,CAAC,UAAU,CAAC,SAAS,CAAC,CAAA;IACvD,OAAO,CAAC,GAAG,CAAC;0BACU,UAAU,CAAC,KAAK,EAAE;4BAChB,UAAU,CAAC,SAAS,EAAE,mDAAmD,CAAC,CAAA;IAClG,iDAAiD;IACjD,EAAE,CAAC,aAAa,CAAC,gBAAgB,EAAE,gBAAgB,UAAU,GAAG,CAAC,CAAA;IACjE,OAAO,GAAG,UAAU,CAAC,KAAK,EAAE,CAAA;AAChC,CAAC;AARD,gCAQC;AAED,SAAgB,QAAQ,CAAC,OAAuB;IAC5C,OAAO,CAAC,GAAG,CAAC;4BACY,OAAO,CAAC,SAAS,EAAE,mDAAmD,CAAC,CAAA;AACnG,CAAC;AAHD,4BAGC;AAEY,QAAA,YAAY,GAAG,eAAG,CAAC,UAAU,CAAC,OAAO,CAAC,OAAO,CAAC,CAAA;AAC9C,QAAA,WAAW,GAAG,eAAG,CAAC,SAAS,CAAC,cAAc,CAAC,oBAAY,CAAC,CAAA;AACxD,QAAA,eAAe,GAAG,eAAG,CAAC,MAAM,CAAC,IAAI,CAAC,eAAe,CAC1D,mBAAW,CAAC,QAAQ,EAAE,CACzB,CAAA;AACY,QAAA,SAAS,GAAG,mBAAW,CAAC,SAAS,EAAE,CAAA"}
\ No newline at end of file
diff --git a/package.json b/package.json
index 821190a..c576dd6 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
   },
   "dependencies": {
     "dotenv": "^16.0.3",
-    "scrypt-ts": "beta"
+    "scrypt-ts": "=0.2.1-beta.2"
   },
   "devDependencies": {
     "@types/chai": "^4.3.4",
diff --git a/src/contracts/ordinal-lock.ts b/src/contracts/ordinal-lock.ts
index 010f23a..986c66b 100644
--- a/src/contracts/ordinal-lock.ts
+++ b/src/contracts/ordinal-lock.ts
@@ -10,6 +10,9 @@ import {
     SmartContract,
     Sig,
     SigHash,
+    MethodCallOptions,
+    ContractTransaction,
+    bsv,
 } from 'scrypt-ts'
 
 export class OrdinalLock extends SmartContract {
@@ -39,4 +42,49 @@ export class OrdinalLock extends SmartContract {
         assert(this.seller == hash160(pubkey), 'bad seller')
         assert(this.checkSig(sig, pubkey), 'signature check failed')
     }
+
+    static purchaseTxBuilder(
+        current: OrdinalLock,
+        options: MethodCallOptions<OrdinalLock>,
+        selfOutput: ByteString,
+        trailingOutputs: ByteString
+    ): Promise<ContractTransaction> {
+        const unsignedTx: bsv.Transaction = new bsv.Transaction()
+            // build next instance output
+            .addOutput(
+                bsv.Transaction.Output.fromBufferReader(
+                    new bsv.encoding.BufferReader(
+                        Buffer.from(selfOutput, 'hex')
+                    )
+                )
+            )
+            // build payment output
+            .addOutput(
+                bsv.Transaction.Output.fromBufferReader(
+                    new bsv.encoding.BufferReader(
+                        Buffer.from(current.payOutput, 'hex')
+                    )
+                )
+            )
+            .addOutput(
+                bsv.Transaction.Output.fromBufferReader(
+                    new bsv.encoding.BufferReader(
+                        Buffer.from(trailingOutputs, 'hex')
+                    )
+                )
+            )
+            // add contract input
+            .addInput(current.buildContractInput())
+
+        if (options.changeAddress) {
+            // build change output
+            unsignedTx.change(options.changeAddress)
+        }
+
+        return Promise.resolve({
+            tx: unsignedTx,
+            atInputIndex: 0,
+            nexts: [],
+        })
+    }
 }
diff --git a/tests/local/ordinal-lock.test.ts b/tests/local/ordinal-lock.test.ts
index b17b0b8..6e21109 100644
--- a/tests/local/ordinal-lock.test.ts
+++ b/tests/local/ordinal-lock.test.ts
@@ -1,12 +1,14 @@
 import { expect, use } from 'chai'
 import {
     bsv,
+    buildOpreturnScript,
     findSig,
     MethodCallOptions,
     PubKey,
     Ripemd160,
     SigHash,
     SmartContract,
+    toHex,
     TransactionResponse,
 } from 'scrypt-ts'
 import { OrdinalLock } from '../../src/contracts/ordinal-lock'
@@ -35,7 +37,7 @@ describe('Test SmartContract `OrdinalLock`', () => {
             payOut.toString('hex')
         )
 
-        // instance.bindTxBuilder('purchase', OrdinalLock.purchaseTxBuilder)
+        instance.bindTxBuilder('purchase', OrdinalLock.purchaseTxBuilder)
 
         await instance.connect(getDummySigner([sellerPriv]))
         deployTx = await instance.deploy(1)
@@ -79,49 +81,34 @@ describe('Test SmartContract `OrdinalLock`', () => {
     })
 
     it('should pass the purchase method unit test successfully.', async () => {
-        const tx = new bsv.Transaction()
-            .addOutput(
-                new bsv.Transaction.Output({
-                    script: new bsv.Script(sellerAdd),
-                    satoshis: instance.balance,
-                })
-            )
-            //         // build payment output
-            .addOutput(
-                bsv.Transaction.Output.fromBufferReader(
-                    new bsv.encoding.BufferReader(
-                        Buffer.from(instance.payOutput, 'hex')
-                    )
-                )
-            )
-            //         // add contract input
-            .from({
-                txId: deployTx.id,
-                outputIndex: 0,
-                script: deployTx.outputs[0].script.toString(),
-                satoshis: deployTx.outputs[0].satoshis,
+        const selfOutput = toHex(
+            new bsv.Transaction.Output({
+                script: new bsv.Script(sellerAdd),
+                satoshis: instance.balance,
             })
+                .toBufferWriter()
+                .toBuffer()
+        )
 
-        // const asm = `${tx.outputs[0].toBufferWriter().toBuffer().toString('hex')} OP_0 ${tx.getPreimage(0, 0xc1, false)} OP_0`
-        // const preimage = tx.pre
-        const script = bsv.Script.fromBuffer(Buffer.alloc(0))
-            .add(tx.outputs[0].toBufferWriter().toBuffer())
-            .add(bsv.Opcode.OP_0)
-            .add(
-                bsv.Transaction.Sighash.sighashPreimage(
-                    tx,
-                    0xc1,
-                    0,
-                    deployTx.outputs[0].script,
-                    new bsv.crypto.BN(deployTx.outputs[0].satoshis),
-                    0x40
-                )
-            )
-            .add(bsv.Opcode.OP_0)
-        tx.inputs[0].setScript(script)
+        const trailingOutputs = toHex(
+            new bsv.Transaction.Output({
+                script: buildOpreturnScript('00'),
+                satoshis: instance.balance,
+            })
+                .toBufferWriter()
+                .toBuffer()
+        )
 
-        // console.log('Tx: ', JSON.stringify(tx))
-        const result = tx.verifyScript(0)
+        const { tx: callTx, atInputIndex } = await instance.methods.purchase(
+            selfOutput,
+            trailingOutputs,
+            {
+                pubKeyOrAddrToSign: [sellerPub],
+                partiallySigned: true,
+                autoPayFee: false,
+            } as MethodCallOptions<OrdinalLock>
+        )
+        const result = callTx.verifyScript(atInputIndex)
         expect(result.success, result.error).to.eq(true)
     })
 
diff --git a/tests/testnet/ordinal-lock.ts b/tests/testnet/ordinal-lock.ts
index 5b24ec9..e581960 100644
--- a/tests/testnet/ordinal-lock.ts
+++ b/tests/testnet/ordinal-lock.ts
@@ -1,6 +1,16 @@
 import { OrdinalLock } from '../../src/contracts/ordinal-lock'
-import { getDefaultSigner } from './utils/txHelper'
-import { bsv, Ripemd160, findSig, MethodCallOptions, PubKey } from 'scrypt-ts'
+import { getDefaultSigner, randomPrivateKey } from './utils/txHelper'
+import {
+    bsv,
+    Ripemd160,
+    findSig,
+    MethodCallOptions,
+    PubKey,
+    buildOpreturnScript,
+    toHex,
+    DefaultProvider,
+    TestWallet,
+} from 'scrypt-ts'
 import {
     myPrivateKey,
     myPublicKey,
@@ -25,8 +35,6 @@ async function main() {
     )
     await instance.connect(getDefaultSigner(myPrivateKey))
 
-    // instance.bindTxBuilder('purchase', OrdinalLock.purchaseTxBuilder)
-
     // contract deployment
     let deployTx = await instance.deploy(1)
     console.log('OrdinalLock contract deployed: ', deployTx.id)
@@ -46,17 +54,78 @@ async function main() {
         payOut.toString('hex')
     )
     await instance.connect(getDefaultSigner(myPrivateKey))
-    // instance.bindTxBuilder('purchase', OrdinalLock.purchaseTxBuilder)
+    instance.bindTxBuilder('purchase', OrdinalLock.purchaseTxBuilder)
 
     // contract deployment
     deployTx = await instance.deploy(1)
     console.log('OrdinalLock contract deployed: ', deployTx.id)
 
-    const { tx: purchaseTx } = await instance.methods.purchase(payScript, {
-        changeAddress: myAddress,
-    } as MethodCallOptions<OrdinalLock>)
+    const selfOutput = toHex(
+        new bsv.Transaction.Output({
+            script: new bsv.Script(myAddress),
+            satoshis: instance.balance,
+        })
+            .toBufferWriter()
+            .toBuffer()
+    )
+
+    const trailingOutputs = toHex(
+        new bsv.Transaction.Output({
+            script: buildOpreturnScript('00'),
+            satoshis: instance.balance,
+        })
+            .toBufferWriter()
+            .toBuffer()
+    )
+
+    const { tx: callTx, atInputIndex } = await instance.methods.purchase(
+        selfOutput,
+        trailingOutputs,
+        {
+            pubKeyOrAddrToSign: [myPublicKey],
+            partiallySigned: true,
+            autoPayFee: false,
+        } as MethodCallOptions<OrdinalLock>
+    )
+    const result = callTx.verifyScript(atInputIndex)
+
+    console.log('OrdinalLock contract `purchase` verify: ', result)
+
+    const needSatoshiAsFee =
+        callTx.outputAmount + callTx.getEstimateFee() + callTx.inputAmount
+
+    console.log('needSatoshiAsFee', needSatoshiAsFee)
+
+    // now you have a partially Signed tx, send this tx to user , then user add a input, and sign it
+
+    const userPrivateKey = bsv.PrivateKey.fromWIF(
+        'cS98v9dfvPsLUcpriCpiRw3tZ65sp77XjDr5ZJtnXUvQKHQiqtQL'
+    )
+
+    const userSigner = new TestWallet(
+        userPrivateKey,
+        new DefaultProvider({
+            network: bsv.Networks.testnet,
+        })
+    )
+
+    const utxos = await userSigner.listUnspent(userPrivateKey.toAddress(), {
+        minSatoshis: needSatoshiAsFee,
+    })
+
+    // add p2pkh input to pay fee
+    callTx.from(utxos)
+
+    console.log('utxos', utxos)
+
+    // only sign p2pkh input
+    await userSigner.signTransaction(callTx)
+
+    console.log('check fee', callTx.getFee(), callTx.getEstimateFee())
+
+    await userSigner.provider.sendTransaction(callTx)
 
-    console.log('OrdinalLock contract `purchase` called: ', purchaseTx.id)
+    console.log('OrdinalLock contract `purchase` called: ', callTx.id)
 }
 
 describe('Test SmartContract `OrdinalLock` on testnet', () => {
diff --git a/tests/testnet/utils/txHelper.ts b/tests/testnet/utils/txHelper.ts
index 9ced911..c70e2cf 100644
--- a/tests/testnet/utils/txHelper.ts
+++ b/tests/testnet/utils/txHelper.ts
@@ -25,7 +25,9 @@ export function getDefaultSigner(
     if (global.testnetSigner === undefined) {
         global.testnetSigner = new TestWallet(
             myPrivateKey,
-            new DefaultProvider()
+            new DefaultProvider({
+                network: bsv.Networks.testnet,
+            })
         )
     }
     if (privateKey !== undefined) {