Sign a message in your own wallet
A signed message proves you control an address without moving funds or revealing your keys. Choose your wallet, then check the result in the verifier.
Bitcoin
Sparrow signs messages from any single-sig address in an open wallet, including hardware-wallet accounts such as BitBox02, Ledger, Trezor or Coldcard connected through Sparrow..
Bitcoin
Electrum has a Sign/Verify Message tool in the desktop app and signmessage / verifymessage commands on the command line.
Bitcoin, Bitcoin-like coins, EVM chains, Cardano
Trezor Suite has a built-in Sign & Verify tool for each account.
Ethereum and EVM chains
MetaMask signs messages when a website asks it to with personal_sign.
Monero (XMR)
The Monero GUI (Advanced mode) has a Sign/verify tab for messages and files, and monero-wallet-cli has sign and verify commands.