Extrinsic 3405-1

{
  "heartbeat": {
    "blockNumber": 3404,
    "sessionIndex": 56,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x90764b2b3e53080b1b99d25d8ea42b56f31651bd619c3d30dbf58ca47a859b73343b71d49019295b51b52edbdf6566ae06f86b4cab68739d77431b776b250e8a"
}