Method eth_sign undefined ()
connect with WS protocol

Parameters

DATA - hex string

20 Bytes - address

DATA - hex string

N Bytes - message to sign

Request

wscat -c wss://bsc.getblock.io/YOUR-API-KEY/mainnet/ 
# wait for connection and send the request body 
{"jsonrpc": "2.0",
"method": "eth_sign",
"params": ["0xcee8ae756461e2653b88aefdbd70c1144de52b23", "0xbcda"],
"id": "getblock.io"}

Response

{
    "error": {
        "code": -32000,
        "message": "unknown account"
    },
    "id": "getblock.io",
    "jsonrpc": "2.0"
}