After segwit BTC is not Bitcoin anymore! This is not Original Bitcoin!
Irony, You sign message Bitcoin segwit address.
-----BEGIN BITCOIN SIGNED MESSAGE-----
BSV - is Original Bitcoin. Satoshi Vision
-----BEGIN SIGNATURE-----
3KDJhw9LewyXdfvZ4JQktkTDLfutPbyTxv
-----END BITCOIN SIGNED MESSAGE-----
And wrong format, don't have
signature, Read here before sign message:
Sign message formatmost of payments are carried out in this currency
Nothing