Extrinsic 6159-1

{
  "heartbeat": {
    "blockNumber": 6157,
    "sessionIndex": 102,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x461c5cfcbe7752e36ea0d02631872c17af2f33df964b7a12e7fedc149c393b60ab37d7df61399d41daa47601a5bf9350565b3b94b2d03d5cb2972b2efb07568b"
}