{
  "address": "0x4293b5Dc11B250078Da7359D7d57c15EECfcf70a",
  "msg": "\"it is I, Cezarysw, who am the owner of this account - 21-12-2020 09:32 bitcointalk.org",
  "sig": "0xbfbbc5473c45d7800e70dd7c223d2906393ecf2a37f4cbdadc621ae38233ff207be9412623f94 17e1e28c64fd02ab3bde710f2a8c61cc92330147e778a28a2c01c",
  "version": "2"
}

https://mycrypto.com/sign-and-verify-message/verify