Verify Signed Message
Signing a message is an identification technique that proves the ownership of a crypto-currency address and the Bitcoin balance in that address.
The form on this page can be used to verify that a message comes from a specific Bitcoin address.
By signing a message using your Bitcoin address you can confirm that you are the owner of the funds that your wallet holds. You also prove that you control the private keys of that particular address.
For now this tool works only for legacy Bitcoin addresses (starts with 1...). For segwit addresses that starts with 3... or bc... is recommended to use Electrum wallet tool.