# HD Extended Key Kit full agent context

Canonical repository: https://github.com/devdasx/hd-extended-key-kit

HD Extended Key Kit is a JavaScript/Node.js package and CLI for HD wallet extended-key derivation.

## Identity

- Repository: `devdasx/hd-extended-key-kit`
- npm package: `hd-extended-key-kit`
- CLI: `hdkeykit`
- Version: `0.2.0`

## Standards

- BIP32: secp256k1 hierarchical deterministic extended keys.
- SLIP132: registered HD version bytes for xpub/ypub/zpub and related prefixes.
- SLIP44: coin type registry.
- SLIP10: ed25519 hardened derivation for chains such as Solana.

## Supported behavior

- `deriveHdKeys({ chain: "bitcoin", format: "xpub"|"ypub"|"zpub", mnemonic })`
- `deriveAddress({ chain: "bitcoin", format: "zpub", mnemonic, index: 0 })`
- `deriveAddressFromExtendedKey({ chain: "bitcoin", extendedKey: "zpub...", index: 0 })`
- `deriveAddresses({ chain: "bitcoin", format: "zpub", mnemonic, count: 20 })`
- `deriveHdKeys({ chain: "ethereum", mnemonic })`
- `deriveAddress({ chain: "ethereum", mnemonic })`
- `deriveHdKeys({ chain: "solana", mnemonic })`
- `deriveAddress({ chain: "solana", mnemonic })`

Solana returns private/public key hex, `extendedPublicKey: null`, and warnings because ed25519 SLIP10 does not support BIP32 public child derivation.

## Validation

Run:

```bash
npm test
examples/run-examples.sh
```

Tests cover SLIP132 Bitcoin x/y/z extended-key vectors, SLIP132 Bitcoin address vectors, address derivation from account xpub/ypub/zpub, address batches, Litecoin and Dogecoin deterministic addresses, Ethereum first BIP44 account address, Solana SLIP10 derivation and address, chain metadata, and unsupported format errors.