Merge pull request #5953 from mempool/natsoni/tx-preview-fill-signatures

Fill signatures data on transaction preview page
2025-09-26 22:47:13 +02:00 · 2025-07-14 23:02:38 -10:00
parent b237d72eb1 318d922a82
commit a76c307983
6 changed files with 345 additions and 40 deletions
--- a/frontend/src/app/components/pool/pool.component.html
+++ b/frontend/src/app/components/pool/pool.component.html
@@ -220,7 +220,7 @@
                    <thead>
                      <tr>
                        <th class="data-title clip text-center coinbase" i18n="latest-blocks.coinbasetag">
-                          <a class="title-link" [routerLink]="['/tx/preview' | relativeUrl]" [fragment]="'offline=true&hex=' + job.coinbase">
+                          <a class="title-link" [routerLink]="['/tx/preview' | relativeUrl]" [fragment]="'offline=true&tx=' + job.coinbase">
                            Coinbase tag <span>&nbsp;</span>
                            <fa-icon [icon]="['fas', 'external-link-alt']" [fixedWidth]="true" style="vertical-align: text-top; font-size: 13px; color: var(--title-fg)"></fa-icon>
                          </a>
--- a/frontend/src/app/components/stratum/stratum-list/stratum-list.component.html
+++ b/frontend/src/app/components/stratum/stratum-list/stratum-list.component.html
@@ -45,7 +45,7 @@
              <app-amount [satoshis]="row.job.reward"></app-amount>
            </td>
            <td class="height">
-              <a [routerLink]="['/tx/preview' | relativeUrl]" [fragment]="'offline=true&hex=' + row.job.coinbase">
+              <a [routerLink]="['/tx/preview' | relativeUrl]" [fragment]="'offline=true&tx=' + row.job.coinbase">
                {{ row.job.height }}
              </a>
            </td>
--- a/frontend/src/app/components/transaction/transaction-raw.component.html
+++ b/frontend/src/app/components/transaction/transaction-raw.component.html
@@ -54,7 +54,10 @@
            Redirecting to transaction page...
          </ng-container>
        </span>
-        <button *ngIf="!successBroadcast" [disabled]="isLoadingBroadcast" type="button" class="btn btn-sm btn-primary btn-broadcast" i18n="transaction.broadcast|Broadcast" (click)="postTx()">Broadcast</button>
+        <button *ngIf="!successBroadcast" [disabled]="isLoadingBroadcast || missingSignatures" i18n-ngbTooltip="transaction.missing-signature"
+        ngbTooltip="Transaction cannot be broadcasted because it's missing signature(s)" placement="bottom"
+        [disableTooltip]="!missingSignatures" type="button" class="btn btn-sm btn-primary btn-broadcast"
+        i18n="transaction.broadcast|Broadcast" (click)="postTx()">Broadcast</button>
        <button *ngIf="successBroadcast" type="button" class="btn btn-sm btn-success no-cursor btn-broadcast" i18n="transaction.broadcasted|Broadcasted">Broadcasted</button>
      </div>
    }
@@ -159,11 +162,17 @@
            <tbody>
              <tr>
                <td i18n="block.size">Size</td>
-                <td [innerHTML]="'&lrm;' + (transaction.size | bytes: 2)"></td>
+                <td>
+                  <span [innerHTML]="'&lrm;' + (transaction.size + sizeFromMissingSig | bytes: 2)"></span>
+                  <fa-icon *ngIf="tooltipSize" [ngbTooltip]="tooltipSize" class="icon-symbol" [icon]="['fas', 'info-circle']" [fixedWidth]="true"></fa-icon>
+                </td>
              </tr>
              <tr>
                <td i18n="transaction.vsize|Transaction Virtual Size">Virtual size</td>
-                <td [innerHTML]="'&lrm;' + (transaction.weight / 4 | vbytes: 2)"></td>
+                <td>
+                  <span [innerHTML]="'&lrm;' + ((transaction.weight + weightFromMissingSig) / 4 | vbytes: 2)"></span>
+                  <fa-icon *ngIf="tooltipVsize" [ngbTooltip]="tooltipVsize" class="icon-symbol" [icon]="['fas', 'info-circle']" [fixedWidth]="true"></fa-icon>
+                </td>
              </tr>
              <tr *ngIf="adjustedVsize">
                <td><ng-container i18n="transaction.adjusted-vsize|Transaction Adjusted VSize">Adjusted vsize</ng-container>
@@ -175,7 +184,10 @@
              </tr>
              <tr>
                <td i18n="block.weight">Weight</td>
-                <td [innerHTML]="'&lrm;' + (transaction.weight | wuBytes: 2)"></td>
+                <td>
+                  <span [innerHTML]="'&lrm;' + (transaction.weight + weightFromMissingSig | wuBytes: 2)"></span>
+                  <fa-icon *ngIf="tooltipWeight" [ngbTooltip]="tooltipWeight" class="icon-symbol" [icon]="['fas', 'info-circle']" [fixedWidth]="true"></fa-icon>
+                </td>
              </tr>
            </tbody>
          </table>
--- a/frontend/src/app/components/transaction/transaction-raw.component.scss
+++ b/frontend/src/app/components/transaction/transaction-raw.component.scss
@@ -199,4 +199,9 @@
    margin-left: 0;
    margin-top: 5px;
  }
+}
+
+.icon-symbol {
+  color: rgba(255, 255, 255, 0.4);
+  margin-left: 5px;
 }
--- a/frontend/src/app/components/transaction/transaction-raw.component.ts
+++ b/frontend/src/app/components/transaction/transaction-raw.component.ts
@@ -1,8 +1,11 @@
 import { Component, OnInit, HostListener, ViewChild, ElementRef, OnDestroy } from '@angular/core';
+import { BytesPipe } from '../../shared/pipes/bytes-pipe/bytes.pipe';
+import { VbytesPipe } from '../../shared/pipes/bytes-pipe/vbytes.pipe';
+import { WuBytesPipe } from '../../shared/pipes/bytes-pipe/wubytes.pipe';
 import { Transaction, Vout } from '@interfaces/electrs.interface';
 import { StateService } from '../../services/state.service';
 import { Filter, toFilters } from '../../shared/filters.utils';
-import { decodeRawTransaction, getTransactionFlags, addInnerScriptsToVin, countSigops } from '../../shared/transaction.utils';
+import { decodeRawTransaction, getTransactionFlags, addInnerScriptsToVin, countSigops, fillUnsignedInput } from '../../shared/transaction.utils';
 import { catchError, firstValueFrom, Subscription, switchMap, tap, throwError, timer } from 'rxjs';
 import { WebsocketService } from '../../services/websocket.service';
 import { ActivatedRoute, Router } from '@angular/router';
@@ -23,6 +26,7 @@ export class TransactionRawComponent implements OnInit, OnDestroy {

  pushTxForm: UntypedFormGroup;
  rawHexTransaction: string;
+  psbt: string;
  isLoading: boolean;
  isLoadingPrevouts: boolean;
  isLoadingCpfpInfo: boolean;
@@ -39,6 +43,12 @@ export class TransactionRawComponent implements OnInit, OnDestroy {
  isCoinbase: boolean;
  broadcastSubscription: Subscription;
  fragmentSubscription: Subscription;
+  weightFromMissingSig: number = 0;
+  sizeFromMissingSig: number = 0;
+  missingSignatures: boolean;
+  tooltipSize: string;
+  tooltipVsize: string;
+  tooltipWeight: string;

  isMobile: boolean;
  @ViewChild('graphContainer')
@@ -70,6 +80,9 @@ export class TransactionRawComponent implements OnInit, OnDestroy {
    public seoService: SeoService,
    public apiService: ApiService,
    public relativeUrlPipe: RelativeUrlPipe,
+    public bytesPipe: BytesPipe,
+    public vbytesPipe: VbytesPipe,
+    public wuBytesPipe: WuBytesPipe,
  ) {}

  ngOnInit(): void {
@@ -83,15 +96,15 @@ export class TransactionRawComponent implements OnInit, OnDestroy {
    this.fragmentSubscription = this.route.fragment.subscribe((fragment) => {
      if (fragment) {
        const params = new URLSearchParams(fragment);
-        const hex = params.get('hex');
-        if (hex) {
-          this.pushTxForm.get('txRaw').setValue(hex);
+        const txData = params.get('tx');
+        if (txData) {
+          this.pushTxForm.get('txRaw').setValue(txData);
        }
        const offline = params.get('offline');
        if (offline) {
          this.offlineMode = offline === 'true';
        }
-        if (hex && this.pushTxForm.get('txRaw').value) {
+        if (txData && this.pushTxForm.get('txRaw').value && !this.transaction) {
          this.decodeTransaction();
        }
      }
@@ -102,10 +115,11 @@ export class TransactionRawComponent implements OnInit, OnDestroy {
    this.resetState();
    this.isLoading = true;
    try {
-      const { tx, hex } = decodeRawTransaction(this.pushTxForm.get('txRaw').value.trim(), this.stateService.network);
+      const { tx, hex, psbt } = decodeRawTransaction(this.pushTxForm.get('txRaw').value.trim(), this.stateService.network);
      await this.fetchPrevouts(tx);
+      this.checkSignatures(tx, hex);
      await this.fetchCpfpInfo(tx);
-      this.processTransaction(tx, hex);
+      this.processTransaction(tx, hex, psbt);
    } catch (error) {
      this.error = error.message;
    } finally {
@@ -156,6 +170,45 @@ export class TransactionRawComponent implements OnInit, OnDestroy {
        this.isLoadingPrevouts = false;
      }
    }
+  }
+
+  checkSignatures(transaction: Transaction, hex: string): void {
+    let missingWitnessBytes = 0;
+    let missingNonWitnessBytes = 0;
+
+    let isSegwitTransaction = hex.substring(8, 10) === '00' && hex.substring(10, 12) === '01';
+    let segwitFlagSet = false;
+
+    transaction.vin.forEach(vin => {
+      addInnerScriptsToVin(vin);
+      const result = fillUnsignedInput(vin);
+      vin['_missingSigs'] = result.missingSigs;
+      if (result.addToWitness) {
+        missingWitnessBytes += result.bytes;
+      } else {
+        missingNonWitnessBytes += result.bytes;
+      }
+      if (!isSegwitTransaction && result.addToWitness) {
+        segwitFlagSet = true;
+        isSegwitTransaction = true;
+      }
+    });
+
+    if (segwitFlagSet) { // we just added witness to a legacy transaction: need to add weight corresponding to segwit flag and compact sizes
+      missingWitnessBytes += 2; // marker and flag
+      missingWitnessBytes += transaction.vin.length; // 1 byte compact size per input (assume witness stack count < 253)
+    }
+
+    this.sizeFromMissingSig = missingWitnessBytes + missingNonWitnessBytes;
+    this.weightFromMissingSig = missingWitnessBytes + 4 * missingNonWitnessBytes;
+
+    if (this.weightFromMissingSig) {
+      this.tooltipSize = `Includes ${this.bytesPipe.transform(this.sizeFromMissingSig, 2, undefined, undefined, true)} added for missing signatures`;
+      this.tooltipVsize = `Includes ${this.vbytesPipe.transform(this.weightFromMissingSig / 4, 2, undefined, undefined, true)} added for missing signatures`;
+      this.tooltipWeight = `Includes ${this.wuBytesPipe.transform(this.weightFromMissingSig, 2, undefined, undefined, true)} added for missing signatures`;
+    }
+
+    this.missingSignatures = transaction.vin.some(input => input['_missingSigs'] > 0);

    if (this.hasPrevouts) {
      transaction.fee = transaction.vin.some(input => input.is_coinbase)
@@ -163,11 +216,16 @@ export class TransactionRawComponent implements OnInit, OnDestroy {
        : transaction.vin.reduce((fee, input) => {
          return fee + (input.prevout?.value || 0);
        }, 0) - transaction.vout.reduce((sum, output) => sum + output.value, 0);
-      transaction.feePerVsize = transaction.fee / (transaction.weight / 4);
+      transaction.feePerVsize = transaction.fee / ((transaction.weight + this.weightFromMissingSig) / 4);
+      transaction.sigops = countSigops(transaction);
+      this.adjustedVsize = Math.max((transaction.weight + this.weightFromMissingSig) / 4, transaction.sigops * 5);
+      const adjustedFeePerVsize = transaction.fee / this.adjustedVsize;
+      if (adjustedFeePerVsize !== transaction.feePerVsize) {
+        transaction.effectiveFeePerVsize = adjustedFeePerVsize;
+        this.cpfpInfo = { ancestors: [], effectiveFeePerVsize: adjustedFeePerVsize };
+        this.hasEffectiveFeeRate = true;
+      }
    }
-
-    transaction.vin.forEach(addInnerScriptsToVin);
-    transaction.sigops = countSigops(transaction);
  }

  async fetchCpfpInfo(transaction: Transaction): Promise<void> {
@@ -177,7 +235,7 @@ export class TransactionRawComponent implements OnInit, OnDestroy {
        this.isLoadingCpfpInfo = true;
        const cpfpInfo: CpfpInfo[] = await firstValueFrom(this.apiService.getCpfpLocalTx$([{
          txid: transaction.txid,
-          weight: transaction.weight,
+          weight: transaction.weight + this.weightFromMissingSig,
          sigops: transaction.sigops,
          fee: transaction.fee,
          vin: transaction.vin,
@@ -199,13 +257,14 @@ export class TransactionRawComponent implements OnInit, OnDestroy {
    }
  }

-  processTransaction(tx: Transaction, hex: string): void {
+  processTransaction(tx: Transaction, hex: string, psbt: string): void {
    this.transaction = tx;
    this.rawHexTransaction = hex;
+    this.psbt = psbt;

    this.isCoinbase = this.transaction.vin[0].is_coinbase;

-    // Update URL fragment with hex data
+    // Update URL fragment with hex or psbt data
    this.router.navigate([], {
      fragment: this.getCurrentFragments(),
      replaceUrl: true
@@ -213,9 +272,6 @@ export class TransactionRawComponent implements OnInit, OnDestroy {

    this.transaction.flags = getTransactionFlags(this.transaction, this.cpfpInfo, null, this.transaction.status?.block_height || (this.stateService.latestBlockHeight + 1), this.stateService.network);
    this.filters = this.transaction.flags ? toFilters(this.transaction.flags).filter(f => f.txPage) : [];
-    if (this.transaction.sigops >= 0) {
-      this.adjustedVsize = Math.max(this.transaction.weight / 4, this.transaction.sigops * 5);
-    }

    this.setupGraph();
    this.setFlowEnabled();
@@ -266,6 +322,7 @@ export class TransactionRawComponent implements OnInit, OnDestroy {
  resetState() {
    this.transaction = null;
    this.rawHexTransaction = null;
+    this.psbt = null;
    this.error = null;
    this.errorPrevouts = null;
    this.errorBroadcast = null;
@@ -283,6 +340,12 @@ export class TransactionRawComponent implements OnInit, OnDestroy {
    this.filters = [];
    this.hasPrevouts = false;
    this.missingPrevouts = [];
+    this.weightFromMissingSig = 0;
+    this.sizeFromMissingSig = 0;
+    this.missingSignatures = false;
+    this.tooltipSize = null;
+    this.tooltipVsize = null;
+    this.tooltipWeight = null;
    this.stateService.markBlock$.next({});
    this.mempoolBlocksSubscription?.unsubscribe();
    this.broadcastSubscription?.unsubscribe();
@@ -345,7 +408,7 @@ export class TransactionRawComponent implements OnInit, OnDestroy {
      params.set('offline', 'true');
    }
    if (this.rawHexTransaction) {
-      params.set('hex', this.rawHexTransaction);
+      params.set('tx', this.psbt || this.rawHexTransaction); // use PSBT in fragment if available
    }
    return params.toString();
  }
--- a/frontend/src/app/shared/transaction.utils.ts
+++ b/frontend/src/app/shared/transaction.utils.ts
@@ -1,5 +1,5 @@
 import { TransactionFlags } from '@app/shared/filters.utils';
-import { getVarIntLength, parseMultisigScript, isPoint } from '@app/shared/script.utils';
+import { getVarIntLength, parseMultisigScript, isPoint, parseTapscriptMultisig, parseTapscriptUnanimousMultisig } from '@app/shared/script.utils';
 import { Transaction, Vin } from '@interfaces/electrs.interface';
 import { CpfpInfo, RbfInfo, TransactionStripped } from '@interfaces/node-api.interface';
 import { StateService } from '@app/services/state.service';
@@ -287,12 +287,12 @@ export function processInputSignatures(vin: Vin): SigInfo[] {
      signatures = extractDERSignaturesWitness(vin.witness || []);
      break;
    case 'v1_p2tr': {
-      const hasAnnex = vin.witness.length > 1 &&vin.witness[vin.witness.length - 1].startsWith('50');
-      const isKeyspend = vin.witness.length === (hasAnnex ? 2 : 1);
+      const hasAnnex = vin.witness?.length > 1 && vin.witness[vin.witness.length - 1].startsWith('50');
+      const isKeyspend = vin.witness?.length === (hasAnnex ? 2 : 1);
      if (isKeyspend) {
        signatures = extractSchnorrSignatures(vin.witness);
      } else {
-        const stackItems = vin.witness.slice(0, hasAnnex ? -3 : -2);
+        const stackItems = vin.witness?.slice(0, hasAnnex ? -3 : -2);
        signatures = extractSchnorrSignatures(stackItems);
      }
    } break;
@@ -303,6 +303,156 @@ export function processInputSignatures(vin: Vin): SigInfo[] {
  return signatures;
 }

+/*  
+ * returns the number of missing signatures, the number of bytes to add to the transaction
+ * and whether these should benefit from witness discounting
+ * - Add a DER sig     in scriptsig/witness: 71 bytes signature + 1 push or witness size byte = 72 bytes
+ * - Add a public key  in scriptsig/witness: 33 bytes pubkey    + 1 push or witness size byte = 34 bytes
+ * - Add a Schnorr sig in           witness: 64 bytes signature + 1 witness size byte         = 65 bytes
+*/
+export function fillUnsignedInput(vin: Vin): { missingSigs: number, bytes: number, addToWitness: boolean } {
+  let missingSigs = 0;
+  let bytes = 0;
+  let addToWitness = false;
+
+  const addressType = vin.prevout?.scriptpubkey_type as AddressType;
+  let signatures: SigInfo[] = [];
+  let multisig: { m: number, n: number } | null = null;
+  switch (addressType) {
+    case 'p2pk':
+      signatures = extractDERSignaturesASM(vin.scriptsig_asm);
+      if (!signatures.length) {
+        missingSigs = 1;
+        bytes = 72;
+      }
+      break;
+    case 'multisig':
+      signatures = extractDERSignaturesASM(vin.scriptsig_asm);
+      multisig = parseMultisigScript(vin.prevout.scriptpubkey_asm);
+      if (multisig && multisig.m - signatures.length > 0) {
+        missingSigs = multisig.m - signatures.length;
+        bytes = 72 * missingSigs + 1; // add empty stack item required for OP_CHECKMULTISIG
+        const scriptsigLength = vin.scriptsig.length / 2;
+        const newLength = scriptsigLength + bytes;
+        if (scriptsigLength < 253 && newLength >= 253) {
+          bytes += 2; // Increase scriptsig's compact size from 1 to 3 bytes
+        }
+      }
+      break;
+    case 'p2pkh':
+      signatures = extractDERSignaturesASM(vin.scriptsig_asm);
+      if (!signatures.length) {
+        missingSigs = 1;
+        bytes = 106; // 72 + 34 (sig + public key)
+      }
+      break;
+    case 'p2sh':
+      // Check for P2SH multisig
+      multisig = parseMultisigScript(vin.inner_redeemscript_asm);
+      if (multisig) {
+        signatures = extractDERSignaturesASM(vin.scriptsig_asm);
+        if (multisig.m - signatures.length > 0) {
+          missingSigs = multisig.m - signatures.length;
+          bytes = 72 * missingSigs + 1; // empty push required for OP_CHECKMULTISIG
+          const scriptsigLength = vin.scriptsig.length / 2;
+          const newLength = scriptsigLength + bytes;
+          if (scriptsigLength < 253 && newLength >= 253) {
+            bytes += 2; // Increase scriptsig's compact size from 1 to 3 bytes
+          }
+        }
+      }
+
+      // P2SH-P2WSH
+      if (/OP_0 OP_PUSHBYTES_32 [a-fA-F0-9]{64}/.test(vin.inner_redeemscript_asm) && vin.inner_witnessscript_asm) {
+        // Check for P2WSH multisig
+        multisig = parseMultisigScript(vin.inner_witnessscript_asm);
+        if (multisig) {
+          signatures = extractDERSignaturesWitness(vin.witness || []);
+          if (multisig.m - signatures.length > 0) {
+            missingSigs = multisig.m - signatures.length;
+            bytes = 72 * missingSigs + 1; // empty push required for OP_CHECKMULTISIG
+            addToWitness = true;
+          }
+        }
+      }
+
+      // P2SH-P2WPKH
+      if (/OP_0 OP_PUSHBYTES_20 [a-fA-F0-9]{40}/.test(vin.inner_redeemscript_asm)) {
+        signatures = extractDERSignaturesWitness(vin.witness || []);
+        if (!signatures.length) {
+          missingSigs = 1;
+          bytes = 106; // 72 + 34 (sig + public key)
+          addToWitness = true;
+        }
+      }
+      break;
+    case 'v0_p2wpkh':
+      signatures = extractDERSignaturesWitness(vin.witness || []);
+      if (!signatures.length) {
+        missingSigs = 1;
+        bytes = 106; // 72 + 34 (sig + public key)
+        addToWitness = true;
+      }
+      break;
+    case 'v0_p2wsh':
+      signatures = extractDERSignaturesWitness(vin.witness || []);
+      multisig = parseMultisigScript(vin.inner_witnessscript_asm);
+      if (multisig) {
+        signatures = extractDERSignaturesWitness(vin.witness || []);
+        if (multisig.m - signatures.length > 0) {
+          missingSigs = multisig.m - signatures.length;
+          bytes = 72 * missingSigs + 1; // empty push required for OP_CHECKMULTISIG
+          addToWitness = true;
+        }
+      }
+      break;
+    case 'v1_p2tr':
+      const hasAnnex = vin.witness?.length > 1 && vin.witness[vin.witness.length - 1].startsWith('50');
+      if (vin.inner_witnessscript_asm) {
+        const stackItems = vin.witness.slice(0, hasAnnex ? -3 : -2);
+        if (/^OP_PUSHBYTES_32 [a-fA-F0-9]{64} OP_CHECKSIG$/.test(vin.inner_witnessscript_asm)) {
+          signatures = extractSchnorrSignatures(stackItems);
+          if (!signatures.length) {
+            missingSigs = 1;
+            bytes = 65;
+            addToWitness = true;
+          }
+        }
+
+        multisig = parseTapscriptMultisig(vin.inner_witnessscript_asm);
+        if (multisig) {
+          signatures = extractSchnorrSignatures(stackItems);
+          if (multisig.m - signatures.length > 0) {
+            missingSigs = multisig.m - signatures.length;
+            bytes = 65 * missingSigs + (multisig.n - multisig.m); // empty witness items for each non-signing keys
+            addToWitness = true;
+          }
+        }
+
+        let unanimousMultisig = parseTapscriptUnanimousMultisig(vin.inner_witnessscript_asm);
+        if (unanimousMultisig) {
+          signatures = extractSchnorrSignatures(stackItems);
+          if (unanimousMultisig - signatures.length > 0) {
+            missingSigs = unanimousMultisig - signatures.length;
+            bytes = 65 * missingSigs;
+            addToWitness = true;
+          }
+        }
+      } else { // Assume keyspend
+        signatures = extractSchnorrSignatures(vin.witness?.slice(0, hasAnnex ? -1 : undefined) || []);
+        if (!signatures.length) {
+          missingSigs = 1;
+          bytes = 65;
+          addToWitness = true;
+        }
+      }
+      break;
+    default:
+      break;
+  }
+  return { missingSigs, bytes, addToWitness };
+}
+
 /**
 * Validates most standardness rules
 *
@@ -958,7 +1108,7 @@ export function addInnerScriptsToVin(vin: Vin): void {
  if (vin.prevout.scriptpubkey_type === 'p2sh') {
    const redeemScript = vin.scriptsig_asm.split(' ').reverse()[0];
    vin.inner_redeemscript_asm = convertScriptSigAsm(redeemScript);
-    if (vin.witness && vin.witness.length) {
+    if (vin.witness && vin.witness.length > 2) {
      const witnessScript = vin.witness[vin.witness.length - 1];
      vin.inner_witnessscript_asm = convertScriptSigAsm(witnessScript);
    }
@@ -1072,7 +1222,10 @@ function fromBuffer(buffer: Uint8Array, network: string, inputs?: { key: Uint8Ar
        finalScriptWitness: null,
        redeemScript: null,
        witnessScript: null,
-        partialSigs: []
+        partialSigs: [],
+        tapLeafScripts: [],
+        tapScriptSigs: [],
+        tapInternalKey: null,
      };

      for (const record of inputRecords) {
@@ -1098,6 +1251,14 @@ function fromBuffer(buffer: Uint8Array, network: string, inputs?: { key: Uint8Ar
          case 0x02:
            groups.partialSigs.push(record);
            break;
+          case 0x14:
+            groups.tapScriptSigs.push(record);
+            break;
+          case 0x15:
+            groups.tapLeafScripts.push(record);
+            break;
+          case 0x17:
+            groups.tapInternalKey = record;
        }
      }

@@ -1154,30 +1315,35 @@ function fromBuffer(buffer: Uint8Array, network: string, inputs?: { key: Uint8Ar
        }
        vin.scriptsig = (vin.scriptsig || '') + uint8ArrayToHexString(pushOpcode) + uint8ArrayToHexString(redeemScript);
        vin.scriptsig_asm = convertScriptSigAsm(vin.scriptsig);
+        vin.inner_redeemscript_asm = vin.scriptsig_asm.split(' ').reverse()[0];
      }
      if (groups.witnessScript && !finalizedWitness) {
        vin.witness = (vin.witness || []).concat(uint8ArrayToHexString(groups.witnessScript.value));
+        vin.inner_witnessscript_asm = convertScriptSigAsm(vin.witness[vin.witness.length - 1]);
      }

-
      // Fill partial signatures
      for (const record of groups.partialSigs) {
+        const signature = record.value;
        const scriptpubkey_type = vin.prevout?.scriptpubkey_type;
-        if (scriptpubkey_type === 'v0_p2wsh' && !finalizedWitness) {
-          vin.witness = vin.witness || [];
-          vin.witness.unshift(uint8ArrayToHexString(record.value));
+        if (scriptpubkey_type === 'multisig' && !finalizedScriptSig) {
+          if (signature.length > 74) {
+            throw new Error("Signature must be <= 74 bytes");
+          }
+          const pushOpcode = new Uint8Array([signature.length]);
+          vin.scriptsig = uint8ArrayToHexString(pushOpcode) + uint8ArrayToHexString(signature) + (vin.scriptsig || '');
+          vin.scriptsig_asm = convertScriptSigAsm(vin.scriptsig);
        }
        if (scriptpubkey_type === 'p2sh') {
          const redeemScriptStr = vin.scriptsig_asm ? vin.scriptsig_asm.split(' ').reverse()[0] : '';
          if (redeemScriptStr.startsWith('00') && redeemScriptStr.length === 68 && vin.witness?.length) {
            if (!finalizedWitness) {
-              vin.witness.unshift(uint8ArrayToHexString(record.value));
+              vin.witness.unshift(uint8ArrayToHexString(signature));
            }
          } else {
            if (!finalizedScriptSig) {
-              const signature = record.value;
-              if (signature.length > 73) {
-                throw new Error("Signature must be <= 73 bytes");
+              if (signature.length > 74) {
+                throw new Error("Signature must be <= 74 bytes");
              }
              const pushOpcode = new Uint8Array([signature.length]);
              vin.scriptsig = uint8ArrayToHexString(pushOpcode) + uint8ArrayToHexString(signature) + (vin.scriptsig || '');
@@ -1185,6 +1351,65 @@ function fromBuffer(buffer: Uint8Array, network: string, inputs?: { key: Uint8Ar
            }
          }
        }
+        if (scriptpubkey_type === 'v0_p2wsh' && !finalizedWitness) {
+          vin.witness = vin.witness || [];
+          vin.witness.unshift(uint8ArrayToHexString(signature));
+        }
+      }
+
+      if (groups.tapLeafScripts.length && groups.tapInternalKey && !finalizedWitness) {
+        // If no signature is present, assume key spend *except* if internal key is provably unspendable
+        if (!groups.tapScriptSigs.length) {
+          if (uint8ArrayToHexString(groups.tapInternalKey.value) === '50929b74c1a04954b78b4b6035e97a5e078a5a0f28ec96d547bfee9ace803ac0') {
+            // unspendable internal key, use the first tap leaf script provided
+            const record = groups.tapLeafScripts[0];
+            const controlBlock = uint8ArrayToHexString(record.key.slice(1));
+            const tapLeaf = uint8ArrayToHexString(record.value.slice(0, -1));
+            vin.witness = vin.witness || [];
+            vin.witness.unshift(tapLeaf, controlBlock);
+            vin.inner_witnessscript_asm = convertScriptSigAsm(tapLeaf);
+          }
+        } else {
+          // get the hash with the most signatures
+          const leafScriptSignatures: { [leafHash: string]: number } = {};
+          let maxSignatures = 0;
+          let scriptMostSigs = '';
+
+          for (const record of groups.tapScriptSigs) {
+            const leafHash = uint8ArrayToHexString(record.key.slice(33));
+            if (!leafScriptSignatures[leafHash]) {
+              leafScriptSignatures[leafHash] = 0;
+            }
+            leafScriptSignatures[leafHash]++;
+            if (leafScriptSignatures[leafHash] > maxSignatures) {
+              maxSignatures = leafScriptSignatures[leafHash];
+              scriptMostSigs = leafHash;
+            }
+          }
+
+          // find the script with most signatures
+          for (const record of groups.tapLeafScripts) {
+            const leafVersion = uint8ArrayToHexString(record.value.slice(-1));
+            const script = uint8ArrayToHexString(record.value.slice(0, -1));
+            const scriptSize = uint8ArrayToHexString(compactSize(record.value.length - 1));
+            if (taggedHash('TapLeaf', leafVersion + scriptSize + script) === scriptMostSigs) {
+              // add the script
+              const controlBlock = uint8ArrayToHexString(record.key.slice(1));
+              const tapLeaf = uint8ArrayToHexString(record.value.slice(0, -1));
+              vin.witness = vin.witness || [];
+              vin.witness.unshift(tapLeaf, controlBlock);
+              vin.inner_witnessscript_asm = convertScriptSigAsm(tapLeaf);
+              // add the signatures that are part of this script
+              for (const sigRecord of groups.tapScriptSigs) {
+                const sigLeafHash = uint8ArrayToHexString(sigRecord.key.slice(33));
+                if (sigLeafHash === scriptMostSigs) {
+                  vin.witness.unshift(uint8ArrayToHexString(sigRecord.value));
+                }
+              }
+              break;
+            }
+          }
+        }
      }
    }    
  }
@@ -1309,7 +1534,7 @@ function decodePsbt(psbtBuffer: Uint8Array): { rawTx: Uint8Array; inputs: { key:
  return { rawTx, inputs };
 }

-export function decodeRawTransaction(input: string, network: string): { tx: Transaction, hex: string } {
+export function decodeRawTransaction(input: string, network: string): { tx: Transaction, hex: string, psbt?: string } {
  if (!input.length) {
    throw new Error('Empty input');
  }
@@ -1325,7 +1550,7 @@ export function decodeRawTransaction(input: string, network: string): { tx: Tran

  if (buffer[0] === 0x70 && buffer[1] === 0x73 && buffer[2] === 0x62 && buffer[3] === 0x74) { // PSBT magic bytes
    const { rawTx, inputs } = decodePsbt(buffer);
-    return fromBuffer(rawTx, network, inputs);
+    return { ...fromBuffer(rawTx, network, inputs), psbt: uint8ArrayToHexString(buffer) };
  }

  return fromBuffer(buffer, network);