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Sign Transactions

Overview

For self-managed wallets, after initiating a transaction, BitGo constructs an unsigned transaction. When wallet co-signers begin signing the transaction, it becomes a partially-signed transaction. Once all required co-signers sign the transaction, it becomes a half-signed transaction. A transaction is fully signed after you send it to BitGo and BitGo signs, using the BitGo key.

Note: For custodial wallets, BitGo is responsible for all keys and signatures. There's no client integration for signing transactions from custodial wallets.

  • Multisig Cold
  • Multisig Hot
  • TSS

Wallet co-signers sign transactions using the BitGo Offline Vault Console (OVC). There's no client integration for signing transactions from self-managed cold wallets.

Prerequisites

  • Multisig Cold
  • Multisig or TSS Hot

Steps

  • Multisig
  • TSS

If transacting from a self-managed cold wallet, co-signers must sign the transaction using the OVC.

If transacting from a self-managed hot wallet, review the following:

  • SDK
  • SDK (External-Signing Mode)
  • Express
  • Express (External-Signing Mode)
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let params = {
  txPrebuild: {
    txHex:
      '010000000179b0b5ad6641de8fed13270395e52515236c922d1dd5bee3a9dae68c3cbbf57d0100000000ffffffff0240420f000000000017a914f600974688ccdf5e72ce3f2b187afabbf4f1d3ec878e7835000000000017a9140c0a513cb9d8e46113c57aa46ae42d1bad29063d8700000000',
    txInfo: {
      nP2SHInputs: 1,
      nSegwitInputs: 0,
      nOutputs: 2,
      unspents: [
        {
          chain: 1,
          index: 10,
          redeemScript:
            '52210208906f13de98b88bc9f83886c39a1555ada816b12de6f029626af2ef9413708b2102bca01320026604530fc47068ce015b39b91bd72d8964b0c5023697645b1441ab210336d8e968990c8a5b2bad83a237c37957ce70586ed507b155941ea28ec953860153ae',
          id: '7df5bb3c8ce6daa9e3bed51d2d926c231525e595032713ed8fde4166adb5b079:1',
          address: '2MvevrYxML8NkRng4avXz7oMCgs5qxR7Mef',
          value: 4508000,
        },
      ],
      changeAddresses: ['2MtLtTSsC98dF4zriFGvCfmce3A17Zz1McK'],
    },
    feeInfo: {
      size: 373,
      fee: 3730,
      feeRate: 10000,
      payGoFee: 0,
      payGoFeeString: '0',
    },
  },
  prv: 'xprvmysecretprivatekey',
};
wallet.signTransaction(params).then(function (transaction) {
  // print half-signed transaction hex
  console.dir(transaction);
});

Step Result

The following is a half-signed transaction that's sent to BitGo for final signing:

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{
  "txInfo": {
    "txHex": "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"
  }
}

Next Steps

  1. If required, Approve Transactions
  2. Send Transactions

See Also