feat: implement getRgbppSpvProof for OfflineBtcAssetsDataSource

.changeset/nervous-doors-peel.md

@@ -0,0 +1,7 @@
+---
+'@rgbpp-sdk/service': minor
+---
+
+Implement `getRgbppSpvProof` for `OfflineBtcAssetsDataSource`, enabling support for offline unlocking of BTC time lock cells.
+
+  - Add an example demonstrating how to unlock BTC time lock cells offline.

examples/rgbpp/xudt/offline/5-unlock-btc-time-cell.ts

@@ -0,0 +1,57 @@
+import { buildBtcTimeCellsSpentTx, signBtcTimeCellSpentTx } from 'rgbpp';
+import { sendCkbTx, getBtcTimeLockScript, btcTxIdAndAfterFromBtcTimeLockArgs } from 'rgbpp/ckb';
+import { BTC_TESTNET_TYPE, CKB_PRIVATE_KEY, btcService, ckbAddress, collector, isMainnet } from '../../env';
+import { OfflineBtcAssetsDataSource, SpvProofEntry } from 'rgbpp/service';
+
+const unlockBtcTimeCell = async ({ btcTimeCellArgs }: { btcTimeCellArgs: string }) => {
+  const btcTimeCells = await collector.getCells({
+    lock: {
+      ...getBtcTimeLockScript(isMainnet, BTC_TESTNET_TYPE),
+      args: btcTimeCellArgs,
+    },
+    isDataMustBeEmpty: false,
+  });
+  if (!btcTimeCells || btcTimeCells.length === 0) {
+    throw new Error('No btc time cell found');
+  }
+
+  const spvProofs: SpvProofEntry[] = [];
+  for (const btcTimeCell of btcTimeCells) {
+    const { btcTxId, after } = btcTxIdAndAfterFromBtcTimeLockArgs(btcTimeCell.output.lock.args);
+    spvProofs.push({
+      txid: btcTxId,
+      confirmations: after,
+      proof: await btcService.getRgbppSpvProof(btcTxId, after),
+    });
+  }
+
+  const offlineBtcAssetsDataSource = new OfflineBtcAssetsDataSource({
+    txs: [],
+    utxos: [],
+    rgbppSpvProofs: spvProofs,
+  });
+
+  const ckbRawTx: CKBComponents.RawTransaction = await buildBtcTimeCellsSpentTx({
+    btcTimeCells,
+    btcAssetsApi: offlineBtcAssetsDataSource,
+    isMainnet,
+    btcTestnetType: BTC_TESTNET_TYPE,
+  });
+
+  const signedTx = await signBtcTimeCellSpentTx({
+    secp256k1PrivateKey: CKB_PRIVATE_KEY,
+    collector,
+    masterCkbAddress: ckbAddress,
+    ckbRawTx,
+    isMainnet,
+  });
+
+  const txHash = await sendCkbTx({ collector, signedTx });
+  console.info(`BTC time cell has been spent and CKB tx hash is ${txHash}`);
+};
+
+// The btcTimeCellArgs is from the outputs[0].lock.args(BTC Time lock args) of the 3-btc-leap-ckb.ts CKB transaction
+unlockBtcTimeCell({
+  btcTimeCellArgs:
+    '0x7d00000010000000590000005d000000490000001000000030000000310000009bd7e06f3ecf4be0f2fcd2188b23f1b9fcc88e5d4b65a8637b17723bbda3cce8011400000021e782eeb1c9893b341ed71c2dfe6fa496a6435c0600000045241651e435d786d0ba8a1280d4bb3283eca10db728e2ba0a3978c136f5bb19',
+});

packages/service/src/error.ts

@@ -10,6 +10,7 @@ export enum ErrorCodes {
   ASSETS_API_RESPONSE_DECODE_ERROR,
 
   OFFLINE_DATA_SOURCE_METHOD_NOT_AVAILABLE,
+  OFFLINE_DATA_SOURCE_SPV_PROOF_NOT_FOUND,
 }
 
 export const ErrorMessages = {
@@ -22,6 +23,7 @@ export const ErrorMessages = {
   [ErrorCodes.ASSETS_API_RESPONSE_DECODE_ERROR]: 'Failed to decode the response of BtcAssetsAPI',
 
   [ErrorCodes.OFFLINE_DATA_SOURCE_METHOD_NOT_AVAILABLE]: 'Method not available for offline data source',
+  [ErrorCodes.OFFLINE_DATA_SOURCE_SPV_PROOF_NOT_FOUND]: 'SPV proof not found for the given txid and confirmations',
 };
 
 export class BtcAssetsApiError extends Error {

packages/service/src/service/offline-service.ts

@@ -16,11 +16,19 @@ import {
   RgbppApiRetryCkbTransactionPayload,
   OfflineBtcUtxo,
   BtcApiRecommendedFeeRates,
+  RgbppApiSpvProof,
 } from '../types';
 
 export interface OfflineBtcData {
   txs: BtcApiTransaction[];
   utxos: OfflineBtcUtxo[];
+  rgbppSpvProofs: SpvProofEntry[];
+}
+
+export interface SpvProofEntry {
+  txid: string;
+  confirmations: number;
+  proof: RgbppApiSpvProof;
 }
 
 /*
@@ -35,6 +43,8 @@ export class OfflineBtcAssetsDataSource extends BtcAssetsApi {
   private txs: Record<string, BtcApiTransaction>;
   // address -> utxos
   private utxos: Record<string, OfflineBtcUtxo[]>;
+  // txid:confirmations -> spv proof
+  private rgbppSpvProofs: Record<string, RgbppApiSpvProof>;
 
   private defaultFee = 1;
 
@@ -56,6 +66,18 @@ export class OfflineBtcAssetsDataSource extends BtcAssetsApi {
       },
       {} as Record<string, OfflineBtcUtxo[]>,
     );
+
+    this.rgbppSpvProofs = offlineData.rgbppSpvProofs.reduce(
+      (acc, proof) => {
+        acc[this.spvKey(proof.txid, proof.confirmations)] = proof.proof;
+        return acc;
+      },
+      {} as Record<string, RgbppApiSpvProof>,
+    );
+  }
+
+  private spvKey(txid: string, confirmations: number) {
+    return `${txid}:${confirmations}`;
   }
 
   getBtcTransaction(txId: string): Promise<BtcApiTransaction> {
@@ -86,6 +108,17 @@ export class OfflineBtcAssetsDataSource extends BtcAssetsApi {
     });
   }
 
+  getRgbppSpvProof(btcTxId: string, confirmations: number) {
+    const proof = this.rgbppSpvProofs[this.spvKey(btcTxId, confirmations)];
+    if (!proof) {
+      throw new OfflineBtcAssetsDataSourceError(
+        ErrorCodes.OFFLINE_DATA_SOURCE_SPV_PROOF_NOT_FOUND,
+        `SPV proof not found for txid ${btcTxId} with ${confirmations} confirmations`,
+      );
+    }
+    return Promise.resolve(proof);
+  }
+
   /*
    * The following methods are not available in offline mode.
    */
@@ -160,10 +193,6 @@ export class OfflineBtcAssetsDataSource extends BtcAssetsApi {
     return Promise.reject(new OfflineBtcAssetsDataSourceError(ErrorCodes.OFFLINE_DATA_SOURCE_METHOD_NOT_AVAILABLE));
   }
 
-  getRgbppSpvProof(btcTxId: string, confirmations: number) {
-    return Promise.reject(new OfflineBtcAssetsDataSourceError(ErrorCodes.OFFLINE_DATA_SOURCE_METHOD_NOT_AVAILABLE));
-  }
-
   sendRgbppCkbTransaction(payload: RgbppApiSendCkbTransactionPayload) {
     return Promise.reject(new OfflineBtcAssetsDataSourceError(ErrorCodes.OFFLINE_DATA_SOURCE_METHOD_NOT_AVAILABLE));
   }