How it works
Each of these coins was built from Bitcoin's code, so each has Bitcoin's Sign message feature, with its own address formats and its own message prefix (so a signature for one coin can't be passed off as another's). Signing never sends a transaction and never costs a fee.
Which addresses work
| Coin | Addresses | Wallets that sign |
|---|---|---|
| Dogecoin (DOGE) | D… | Dogecoin Core: File → Sign message |
| Litecoin (LTC) | ltc1q…, L…, M… | Electrum-LTC: Tools → Sign/verify message; Litecoin Core: File → Sign message |
| Bitcoin Cash (BCH) | bitcoincash:q… (or the old 1… form) | Electron Cash: Tools → Sign/verify message; Bitcoin Cash Node: File → Sign message |
Multisig and other script addresses (Dogecoin A…/9…, Bitcoin Cash bitcoincash:p…) can't sign a message on their own. Exchange deposit addresses belong to the exchange.
Step by step
- On Get certified, choose Sign by hand, pick the coin, and enter your address. The coin is picked for you when the address makes it obvious.
- Copy the message the page shows you.
- In your wallet, open Sign message, choose the same address, paste the message exactly, and sign. You may be asked for your wallet password.
- Paste the signature back. The page checks it straight away, then takes you to payment.
The message is valid for 30 minutes. If it runs out, press "Get a fresh message".
Tier 3 AML screening
Dogecoin, Litecoin and Bitcoin Cash addresses can also be screened on-chain for sanctions, mixers and stolen funds as part of a Tier 3 certificate, once Tier 3 is available.
Sign once with your wallet: free, no transaction. We counter-sign it and give you a link anyone can verify. From $1.
More guides
How to prove you own a Bitcoin address
Sign a message with the address's key: free, instant, nothing on the blockchain.
How to sign a message with a Bitcoin wallet
Step by step in Xverse, Electrum, Sparrow, Trezor, Ledger and Bitcoin Core.
BIP-322 vs BIP-137: Bitcoin message signing explained
Why there are two formats, which wallets use which, and why Taproot needs BIP-322.
How to prove you own an Ethereum wallet
One signed message, no gas, and it covers every EVM network at once.
Questions
Does signing cost DOGE, LTC or BCH?
No. A signed message isn't a transaction, so nothing is sent and there's no fee.
Why does the page ask which coin it is?
Some old address formats (starting 1 or 3) are shared by Bitcoin and its forks, and each coin signs with its own prefix. Where the address makes it obvious, the coin is picked for you.
Can I use a phone wallet?
Only if it has a Sign message feature you can copy the signature from. Most people use the desktop wallets listed above.