deriveDataPrivateKey

Derives the data private key for a specific account index. Uses the data derivation path m/888'/0'/{index + HARDENED_OFFSET}.

This key was used in Stacks 1.0 for BNS name registration and is still used for Gaia storage and profile signing.

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Usage

import { deriveDataPrivateKey } from '@stacks/wallet-sdk';
import { HDKey } from '@scure/bip32';
import { mnemonicToSeed } from '@scure/bip39';

const seed = await mnemonicToSeed('your 24-word seed phrase ...');
const rootNode = HDKey.fromMasterSeed(seed);

const dataPrivateKey = deriveDataPrivateKey({ rootNode, index: 0 });
// compressed hex private key string

Notes

• The returned private key is compressed (33 bytes, hex-encoded).

• Uses a hardened child derivation (index + 0x80000000).

• This key is separate from the STX private key and is used for data-layer operations (Gaia, profiles).

Reference Link

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Signature

function deriveDataPrivateKey(opts: {
  rootNode: HDKey;
  index: number;
}): string;

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Returns

string

A compressed hex-encoded private key string.

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Parameters

opts (required)

Property	Type	Description
rootNode	HDKey	The root HD key derived from the wallet's seed phrase.
index	number	The account index to derive the key for (0-based).