Extrinsic 3453-1

{
  "heartbeat": {
    "blockNumber": 3451,
    "sessionIndex": 57,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xe28684e16f996b3e1c05d50abac766c63bca795f6f43f656b1f9783fe48b880896a6f9b8100b782f845a8195c43e464192677fb51eb25c9036c15110c4fb2c80"
}