did:key utilities

interface KeyData {
  type: "p256" | "p384" | "k256" | "ed25519";
  bytes: Uint8Array;     // raw key bytes (compressed point for EC; scalar for ed25519)
}

function parseDidKey(didKey: string): KeyData
function formatDidKey(key: KeyData): string

import { parseDidKey, formatDidKey } from "@atiproto/atproto-attestation";

const parsed = parseDidKey("did:key:zDnaeUKTWUXc1HDpGfKbEK4VRpw8FJVDExddoNqfJW3kJyqzn");
// parsed.type  === "p256"
// parsed.bytes is the compressed public key

const did = formatDidKey(parsed);
// did === "did:key:zDnaeUKTWUXc1HDpGfKbEK4VRpw8FJVDExddoNqfJW3kJyqzn"

function parsePrivateMultibase(mb: string): KeyData
function formatPrivateMultibase(key: KeyData): string

import {
  formatPrivateMultibase,
  parsePrivateMultibase,
  Attestation,
} from "@atiproto/atproto-attestation";

// One-time setup: generate, encode, persist somewhere safe.
const priv = generateP256Key();                       // { type: "p256", bytes: <32 bytes> }
const stored = formatPrivateMultibase(priv);          // "z3u2en7t5LRb4G…"

// Later, in a worker / service:
const att = new Attestation({ privateKey: stored });
// equivalent to:
const att2 = new Attestation({ privateKey: parsePrivateMultibase(stored) });