Lock Bitcoin until a future date. Self-custodial — your keys never leave your browser.
Nobody can spend the Bitcoin before this date — not even you.
A 12-word phrase that proves you own the Bitcoin. Generated in your browser — we never see it.
Send Bitcoin to this address. Funds are locked until .
After , you can spend the Bitcoin. Choose your preferred method:
Visit and click Claim Funds. The page works entirely in your browser — nothing is stored on our server.
Type your seed phrase. Your private key is re-derived in your browser from those words — it never leaves your device.
Paste the Bitcoin address where you want the funds. The website builds, signs, and broadcasts the transaction for you.
Free, open source, trusted. Get it at sparrowwallet.com. Works on Windows, Mac, Linux.
File → New Wallet → "New or Imported Software Wallet" → enter your 12 words → set derivation path to → click Apply.
Go to the Send tab, enter your destination address, and broadcast. Sparrow handles the timelock script automatically.
For advanced users. Import this descriptor into any compatible wallet.
Print or save this summary and keep it with your seed words:
| Created: | |
| Unlock date: | |
| Address: | |
| Derivation: |
Keep this page with your seed words. Your 12 words are all you need to recover your Bitcoin. No website, no file, no password — just the words.