Sure here is the relevant part of the code:

import express from 'express';

import { RelayPool } from 'nostr';

import converter from 'bech32-converting';

import WebSocket from 'ws';

import fs from 'fs';

import cors from 'cors';

import { getSignature, validateEvent, verifySignature, getEventHash, getPublicKey, nip04 } from 'nostr-tools';

let sk1 = 'LONG_STRING_IN_HEX_FORMAT'

let pk1 = 'LONG_STRING_IN_HEX_FORMAT'

let pk2 = 'LONG_STRING_IN_HEX_FORMAT'

pool.on('open', relay => {

let event = {

kind: 4,

pubkey: pk1,

created_at: Math.floor(Date.now() / 1000),

tags: [['p', pk2]],

content: 'hello world',

};

event.id = getEventHash(event);

let signedEvent = signEvent(event)

event.sig = getSignature(event, sk1);

let ok = validateEvent(event)

let veryOk = verifySignature(event)

});