Upcoming implementation: compatibility adaptation for the v field in the signature returned after Ledger signing

Current status — planned, not yet released: Today, Ledger signatures (transaction, message, and EIP-712) are returned exactly as the device produces them and end in 00 / 01; the same value goes into the broadcast transaction. Regular (non-Ledger) accounts end in 1b / 1c. Until the change ships, DApps that verify signatures should accept both forms — treat a trailing 00 / 01 as 1b / 1c (v + 27) before recovering the signer or passing the signature to a contract that expects v = 27 / 28.

For Ledger signing (including all transaction signatures, message signatures, and EIP-712 signatures), a new technical measure is planned: the trailing 01 in the signature field will be replaced with 1c, and 00 will be replaced with 1b.

This change ensures that the final byte (two hexadecimal characters) of Ledger account signatures is consistent with those of regular account signatures.

Transaction Signing

The following is a successfully signed Ledger transaction body:

{
    "txID": "......",
    .....other property,
    "signature": [
        "......01"
    ]
}

{
    "txID": "......",
    .....other property,
    "signature": [
        "......1c"
    ]
}

Message Signing

The DApp sends a message signing request:

tron.tronWeb.trx.sign('.....unsign_string');

tron.tronWeb.trx.signMessageV2('.....unsign_string');

Actual signature hash returned by Ledger:

......50f400

Modified hash:

......50f41b

EIP-712 Signing

The DApp sends an EIP-712 signing request:

const types = {
  Person: [
    {
      name: 'name',
      type: 'string',
    },
    {
      name: 'wallet',
      type: 'address',
    },
  ],
  Mail: [
    {
      name: 'from',
      type: 'Person',
    },
    {
      name: 'to',
      type: 'Person',
    },
    {
      name: 'contents',
      type: 'string',
    },
  ],
};

const primaryType = 'Mail';

const domain = {
  name: 'Ether Mail',
  version: '1',
  chainId: '0x2b6653dc',
  verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC',
};

const message = {
  from: {
    name: 'Cow',
    wallet: '0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826',
  },
  to: {
    name: 'Bob',
    wallet: '0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB',
  },
  contents: 'Hello, Bob!',
};

await tron.tronWeb.trx._signTypedData(domain, types, message);

Actual signature hash returned by Ledger:

.....7ee700

Modified hash:

......7ee71b