Some day ago i download mycelium app for holding bitcoin already collected mycelium backup key phrase,
can not find tutorials mycelium verified massage look at the image please
how verified massage?
Mycelium is able to "verify" a signed message created using another wallet... like this ones you can find in
the "Stake your Bitcoin Address" thread. That "Verify Message" menu option allows you to copy/paste a signed message and verify that it is signed correctly.
However, if you want to
create a signed message within Mycelium, you need to select the account you want from the "Accounts" tab (tap it so you get the popup that says you're "working" with that account"... then click the 3 dot menu and select "Sign Message".
If you are using an HD account, it'll prompt you to select which address you want to sign with...
Then, you'll be asked to enter message:
Type your message, then you click the "sign message" button and you'll get the signature:
Which you can then copy to clipboard or "share"... and you'll get something like this:
-----BEGIN BITCOIN SIGNED MESSAGE-----
Test message signing in Mycelium by HCP. 2019-10-31
-----BEGIN BITCOIN SIGNATURE-----
Version: Bitcoin-qt (1.0)
Address: 129Zb5FULziPrkNBwkXaeKmSVphxM1gnZ3
H0d/o5r0EgqW6WI+hSOdLqN48j2JQatTEW1aT8vZgiTMfntPxugltY3Y1wrl6yFIMdKP5Ju/st28NBZTrLJAmus=
-----END BITCOIN SIGNATURE-----
Which can then be verified using something like BrainwalletX:
https://brainwalletx.github.io/#verify?vrAddr=129Zb5FULziPrkNBwkXaeKmSVphxM1gnZ3&vrMsg=Test%20message%20signing%20in%20Mycelium%20by%20HCP.%202019-10-31&vrSig=H0d%2Fo5r0EgqW6WI%2BhSOdLqN48j2JQatTEW1aT8vZgiTMfntPxugltY3Y1wrl6yFIMdKP5Ju%2Fst28NBZTrLJAmus%3DNOTE: if you select an address starting with a "3"... it is highly likely that it will NOT verify properly on BrainwalletX and will only verify in Mycelium, or Electrum or possibly Trezor due to issues with signing messages from P2SH addresses.