Lightning and Self-Custody

Primal Wallet for Beginners: Zaps, Lightning, and a COLDCARD Backup

TL;DR: Primal puts Nostr, zaps and a self-custodial Bitcoin wallet in one app. The wallet uses Breez SDK on Spark, which makes Lightning easy but comes with more trust and recovery tradeoffs than ordinary on-chain Bitcoin. Treat it as pocket money. Write down its recovery words and, if you already use a COLDCARD, save an additional encrypted copy in Seed Vault. This does not turn Primal into cold storage. Keep savings on a separate seed generated by COLDCARD.

By NVK Published 5 min read

A social app with a pocket wallet

Primal is a Nostr client with a Bitcoin wallet built in. You can follow people, read notes, send zaps and pay Lightning invoices without moving to another app. Its iOS and Android apps are open source. The Android project describes the wallet as self-custodial and powered by Breez SDK on Spark.

A zap is a Lightning payment attached to a Nostr profile or note. It can be a tip, a thank-you or just a signal that cost more than clicking a heart. Primal also lets you send sats to a Nostr contact, pay a normal Lightning invoice and receive through Lightning or a Bitcoin address.

Primal Wallet screens showing Lightning and on-chain receive options
Primal offers Lightning and on-chain payment options inside the same pocket wallet. Example screens only; do not scan tutorial QR codes.

Start small

  1. Install Primal from the official download page and create or sign in to your Nostr account.
  2. Open the wallet and add a small amount you can afford to lose.
  3. To pay a Lightning invoice, choose Send, scan or paste the invoice, then check the amount and fee before confirming.
  4. To receive, choose Receive and select the method the sender needs. Make a fresh invoice rather than keeping an old one around.
  5. Try a small zap. Tap the lightning icon on a note or profile, choose the amount and confirm.
Primal screens showing the steps to zap a Nostr post
A zap is a real Lightning payment, not a free social-media reaction. Check the amount before sending.

Primal can also find a recipient through Nostr and attach a message to the payment. That is convenient, but convenience is not verification. Confirm the profile, amount and destination before sending anything meaningful. Similar display names and stolen accounts are still a problem.

Primal screens showing a payment to a Nostr contact
Sending to a Nostr contact is quick. Verify that you selected the right person before paying.

What self-custody means here

Primal's current wallet uses the Breez SDK implementation of Spark. The recovery words are yours and Primal says it cannot recover them for you. You also avoid running a Lightning node, opening channels or managing inbound liquidity.

That does not make it identical to holding normal Bitcoin UTXOs behind a hardware wallet. Spark uses a group of signing operators during off-chain transfers. Its own trust-model documentation requires an honest threshold at the time of transfer, and its limitations page discusses operator liveness and a prior-owner exit race. A unilateral Bitcoin exit exists, but the current exit procedure is marked beta and is technical.

That is a reasonable set of tradeoffs for fast, small payments. It is not where I would park long-term savings. A phone can also be lost, infected, unlocked under duress or backed up somewhere you did not intend.

Back up the Primal wallet

Primal creates a 12-word BIP-39 recovery phrase for a new Spark wallet. In the app, go to Settings → Wallet → Backup wallet.

Primal settings screens showing how to open the wallet backup
Reveal the recovery phrase only in private. Write it down; do not photograph it or put it in cloud notes.

Write the words down in order and check them twice. Do not screenshot them, copy them into a password manager, email them or expose them to a camera. Anyone with these words can recover the wallet.

The wallet phrase and your Nostr private key are separate secrets. Backing up one does not back up the other.

Keep an additional copy in COLDCARD Seed Vault

If you already have a COLDCARD Mk4 or Q, Seed Vault can hold an encrypted copy of the Primal phrase alongside your main COLDCARD setup.

Do this once, in private, with no cameras pointed at the screens:

  1. On COLDCARD, enable Advanced/Tools → Danger Zone → Seed Vault → Enable.
  2. Go to Advanced/Tools → Temporary Seed → Import Words → 12 Words.
  3. Enter the Primal words on the COLDCARD itself. Do not send them by NFC or keep a QR copy on the phone.
  4. When asked whether to save the temporary seed to Seed Vault, press 1. Rename it something clear, such as Primal pocket.
  5. Choose Restore Master, then check that the normal COLDCARD master fingerprint is back.
  6. Make a fresh encrypted COLDCARD system backup. Current full backups include Seed Vault entries.

Seed Vault encrypts entries with a key tied to the COLDCARD master seed. It is an extra protected copy, not an independent backup. Keep the written Primal phrase offline too, and protect the COLDCARD master backup needed to recover its vault.

COLDCARD cannot sign Primal's Spark payments. Storing the phrase there does not remove it from the phone, reverse any earlier exposure or make the Primal balance cold. It just gives you a better place for an additional recovery copy.

Keep savings separate

Use Primal like cash in your pocket: zaps, small Lightning payments and money you may need quickly. For savings, generate a completely separate seed on COLDCARD and keep it off every phone and computer. Never type that COLDCARD savings seed into Primal.

The split is simple: Primal for social payments and daily use; on-chain COLDCARD storage for the amount that would hurt to lose.