nip04.js

const encryptedMessage = await nip04.encrypt(this.prvKey, contact.pubKey, message)

const notificationEvent = {
    kind: 4,
    pubkey: this.pubKey,
    created_at: Math.floor(Date.now() / 1000),
    tags: [['p', contact.pubKey]], // Tag the recipient's pubkey
    content: encryptedMessage
}
const signedEvent = finalizeEvent(notificationEvent, this.prvKey)
await Promise.any(pool.publish(this.relays, signedEvent))