derivePublicKey

Derives dust public key from a 32-byte seed using Midnight's algorithm.

Input: The seed should be derived from BIP-32 at path m/44'/2400'/account'/2/index:

• Derive using HDWallet with role MidnightKeyRole.DUST

• Extract the 32-byte private key

• Pass it to this function

Output: 33-byte public key (1-byte tag + 32 bytes data) encoded as 66-character hex string. This is the DustPublicKey used to receive dust tokens.

Security:

• This function does NOT clear the seed - caller must wipe it

• Public key is safe to share/store - it's public information

• The seed MUST be kept secret - it's the DustSecretKey

Compatibility: The output matches Midnight SDK:

const dustSecretKey = DustSecretKey.fromSeed(seed);
const dustPublicKey = dustSecretKey.toPublicKey();  // Matches our output

Error Handling: Returns null if:

• Native library not loaded

• Native function returns null (internal error)

• Returned key fails validation (invalid hex format)

Throws IllegalArgumentException if seed is not exactly 32 bytes.

Parameters

Throws