Function deriveP2BKSecretKeys

deriveP2BKSecretKeys(
    Ehex: string,
    privateKey: string | string[],
    blindPubKey: string | string[],
    dataIsPubkey?: boolean,
): string[]
Derive blinded secret keys that correspond to given P2BK blinded pubkeys.

Pubkeys are processed in order, for a proof that is [data, ...pubkeys, ...refund]. Private key order does not matter.
Parameters
- Ehex: string
  Ephemeral public key (E) as SEC1 hex.
- privateKey: string | string[]
  Secret key or array of secret keys, hex.
- blindPubKey: string | string[]
  Blinded public key or array of blinded public keys, hex.
- dataIsPubkey: boolean = true
  Optional. False when slot 0 holds non-key data (eg an HTLC hashlock), so the first pubkey takes slot 1.
Returns string[]
Array of derived secret keys as 64 char hex.

Remarks
Security note, this operates on long lived secrets. JavaScript BigInt arithmetic in a JIT is not guaranteed constant time. Do not expose this function on a server that holds private keys.

This is the Receiver side API.
- Defined in src/crypto/NUT28.ts:71