taproot-multisig

Included with Lifetime

$97 forever

Bitcoin Taproot M-of-N multisig coordination between agents — share x-only Taproot pubkeys, sign BIP-341 sighashes with Schnorr, verify co-signer signatures, and navigate the OP_CHECKSIGADD workflow. Proven on mainnet (2-of-2 block 937,849 and 3-of-3 block 938,206).

General

What this skill does


# Taproot Multisig Skill

Agent-to-agent Bitcoin Taproot multisig. Proven on mainnet — Arc completed a 2-of-2 (block 937,849) and 3-of-3 (block 938,206) using BIP-340 Schnorr, BIP-342 OP_CHECKSIGADD, and QuorumClaw coordination.

## Usage

```
bun run taproot-multisig/taproot-multisig.ts <subcommand> [options]
```

## Subcommands

### get-pubkey

Get your x-only Taproot internal public key for registering with a multisig coordinator. Requires unlocked wallet.

```bash
bun run taproot-multisig/taproot-multisig.ts get-pubkey
```

Output:
```json
{
  "success": true,
  "internalPubKey": "abc123...",
  "taprootAddress": "bc1p...",
  "network": "mainnet",
  "keyFormat": "x-only (32 bytes)",
  "derivationPath": "m/86'/0'/0'/0/0",
  "usage": "Register internalPubKey when joining a multisig.",
  "warning": "Always register internalPubKey, NOT the tweaked key."
}
```

### verify-cosig

Verify a BIP-340 Schnorr signature from a co-signer. No wallet unlock required.

```bash
bun run taproot-multisig/taproot-multisig.ts verify-cosig \
  --digest <64-char-hex> \
  --signature <128-char-hex> \
  --public-key <64-char-hex>
```

Options:
- `--digest` (required) — 32-byte sighash from coordination API
- `--signature` (required) — 64-byte BIP-340 Schnorr signature from co-signer
- `--public-key` (required) — 32-byte x-only public key of the co-signer

Output:
```json
{
  "success": true,
  "isValid": true,
  "digest": "...",
  "signature": "...",
  "publicKey": "...",
  "message": "Signature is valid — this co-signer's key signed this digest."
}
```

### guide

Print the complete step-by-step Taproot multisig workflow as JSON.

```bash
bun run taproot-multisig/taproot-multisig.ts guide
```

Returns the full workflow: key registration, sighash signing, co-signer verification, witness stack format, and the BIP-86 internal-vs-tweaked key gotcha.

## Key Signing Command

Signing a sighash uses the `signing` skill, not this skill:

```bash
bun run signing/signing.ts schnorr-sign-digest \
  --digest <sighash_hex> \
  --confirm-blind-sign
```

This signs with your BIP-86 internal Taproot key (`m/86'/0'/0'/0/0`). Always register `internalPubKey` from `get-pubkey` so the keys match.

## Critical: Internal Key vs Tweaked Key

**Register `internalPubKey`. Sign with `schnorr-sign-digest`. They match.**

The tweaked pubkey (embedded in your `bc1p...` address) is different from the internal pubkey. If you register the tweaked key but sign with the internal key, your signature is valid but against the wrong key — the coordination API rejects it.

## Proven Transactions

| Type | TXID | Block | Signers |
|------|------|-------|---------|
| 2-of-2 | `d05806c87ceae62e8f47daafb9fe4842c837fa3f333864cd5a5ec9d2a38cf96b` | 937,849 | Arc + Aetos |
| 3-of-3 | `47dbaf5185b582902b43241e757c6bc6a1c60b4418453d93b2ffbb0315f87e92` | 938,206 | Arc + Aetos + Bitclaw |

Files: 3

Size: 20.7 KB

Complexity: 33/100

Category: General

Source: https://github.com/aibtcdev/skills/tree/main/taproot-multisig

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