Publish to IPNS using secp256k1 cryptocurrency keys

recipient.js

const last = require('it-last')
const crypto = require('libp2p-crypto')
const { BITBOX } = require('bitbox-sdk')
const bitbox = new BITBOX()
const PeerId = require('peer-id')
const CID = require('cids')

//Recipient should convert a scriptSig of the UTXO sent to their address
function blockchainIpnsFetch(ipfs, scriptSig) {
  //Extract public key from script signature
  const { pubKey } = bitbox.Script.decodeP2PKHInput(scriptSigBuf)

  //Convert to libp2p key
  const publicKey = crypto.keys.supportedKeys.secp256k1.unmarshalSecp256k1PublicKey(pubKey)
  const peerId = await PeerId.createFromPubKey(publicKey.bytes)
  const libp2pKey = new CID(1, 'libp2p-key', peerId.id, 'base32').toBaseEncodedString('base36')

  //retry until we get a cid, God willing.
  const result = await resolveIpns(ipfs, libp2pKey, { nocache: true })
  const cid = result && result.replace("/ipfs/", "")
  return await ipfs.cat(cid)
}

async function resolveIpns(ipfs, key, options = {}) {
  return await last(ipfs.name.resolve(key, { stream: false, ...options }));
}

sender.js

const crypto = require('libp2p-crypto')
const wif = require('wif')
const ipns = require('ipns')
const uint8ArrayToString = require('uint8arrays/to-string')
const PeerId = require('peer-id')
const CID = require('cids')

//Sender should convert UTXO private key to libp2p key for publishing
function blockchainIpnsPublish(libp2p, utxoPrivateKey, cid, seqNum) {
  //Convert to libp2p key
  const { privateKey } = wif.decode(utxoPrivateKey)
  const senderLibp2pKey = await crypto.keys.supportedKeys.secp256k1.unmarshalSecp256k1PrivateKey(privateKey)
  
  //Convert to IPNS record key
  const senderPeerId = await PeerId.createFromPrivKey(senderLibp2pKey.bytes)
  const senderIpnsId = new CID(1, 'libp2p-key', senderPeerId.id, 'base32').toBaseEncodedString('base36')
  const recordKey = getSerializedRecordKey(senderIpnsId);

  // Create IPNS record
  const hourMs = 60 * 60 * 1000
  const record = await ipns.create(privateKey, cid, seqNum, hourMs);
  const recordData = ipns.marshal(record);

  //Publish IPNS record to connected gateways
  await libp2p.pubsub.subscribe(recordKey)
  await libp2p.pubsub.publish(recordKey, recordData);
}

function getSerializedRecordKey(id) {
  const origMh = new CID(id).multihash
  const base58mh = new CID(1, 'libp2p-key', origMh, "base58btc").multihash
  const key = ipns.getIdKeys(base58mh).routingKey.uint8Array();
  const serialized = uint8ArrayToString(key, 'base64url');
  return "/record/" + serialized;
}