Ledger Legacy Bitcoin Application

Legacy bitcoin application

Bitcoin wallet application for Ledger Nano S, Ledger Nano S+ and Nano X, up to version 1.6.5.

Warning This is currently only used in order to support and maintain altcoins cloned from Bitcoin. The last stable version of the app as it was used for Bitcoin is kept in the branch legacy-1.6.6 for future reference and does not support Stax or Flex device.

Versions starting from 2.0.0 are at https://github.com/LedgerHQ/app-bitcoin-new.

Ledger Blue is not maintained anymore, but the app can still be compiled for this target using the branch blue-final-release.

The original beta specification can be found at https://ledgerhq.github.io/btchip-doc/bitcoin-technical-beta.html - with the regular set of APDUs for standard wallet operations enabled.

How to use

This application adheres with Ledger latest application guidelines.

You can refer to app-boilerplate Quick start guide for comprehensive up-to-date instructions.

Are you developing a Ledger device application?

See the developers’ documentation on the Developer Portal
Go on Discord to chat with developer support and the developer community.

Client Library

Include the necessary headers (copied from the js/ directory) in your web page

<head>
  <script src="https://github.com/LedgerHQ/app-bitcoin/raw/develop/thirdparty/q.js"></script>
  <script src="https://github.com/LedgerHQ/app-bitcoin/raw/develop/thirdparty/async.min.js"></script>
  <script src="https://github.com/LedgerHQ/app-bitcoin/raw/develop/thirdparty/u2f-api.js"></script>
  <script src="https://github.com/LedgerHQ/app-bitcoin/raw/develop/dist/ledger-btc.js"></script>
</head>

Create a communication object

var dongle = new LedgerBtc(20);

For each UTXO included in your transaction, create a transaction object from the raw serialized version of the transaction used in this UTXO

var tx1 = dongle.splitTransaction("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");

var tx2 = dongle.splitTransaction("...")

To sign a transaction involving standard (P2PKH) inputs, call createPaymentTransactionNew_async with the folowing parameters

inputs is an array of [ transaction, output_index, optional redeem script, optional sequence ] where
- transaction is the previously computed transaction object for this UTXO
- output_index is the output in the transaction used as input for this UTXO (counting from 0)
- redeem script is the optional redeem script to use when consuming a Segregated Witness input
- sequence is the sequence number to use for this input (when using RBF), or non present
associatedKeysets is an array of BIP 32 paths pointing to the path to the private key used for each UTXO
changePath is an optional BIP 32 path pointing to the path to the public key used to compute the change address
outputScript is the hexadecimal serialized outputs of the transaction to sign
lockTime is the optional lockTime of the transaction to sign, or default (0)
sigHashType is the hash type of the transaction to sign, or default (all)

This method returns the signed transaction ready to be broadcast

dongle.createPaymentTransactionNew_async(
   [ [tx, 1] ],
   ["0'/0/0"],
   undefined,
   "01905f0100000000001976a91472a5d75c8d2d0565b656a5232703b167d50d5a2b88ac").then(
     function(result) { console.log(result);}).fail(
     function(error) { console.log(error); });
);

To obtain the signature of multisignature (P2SH) inputs, call signP2SHTransaction_async with the folowing parameters

inputs is an array of [ transaction, output_index, redeem script, optional sequence ] where
- transaction is the previously computed transaction object for this UTXO
- output_index is the output in the transaction used as input for this UTXO (counting from 0)
- redeem script is the mandatory redeem script associated to the current P2SH input
- sequence is the sequence number to use for this input (when using RBF), or non present
associatedKeysets is an array of BIP 32 paths pointing to the path to the private key used for each UTXO
outputScript is the hexadecimal serialized outputs of the transaction to sign
lockTime is the optional lockTime of the transaction to sign, or default (0)
sigHashType is the hash type of the transaction to sign, or default (all)