Extrinsic 15585-1

{
  "heartbeat": {
    "blockNumber": 15583,
    "sessionIndex": 259,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xda88fc6d5555ebb3b3c9e4e789ac47bf08fd0de58b9e26b8af38271e6eab34360de0b19f528ffc5d2de6c4d2bd871f3a6ce2a5698ffce6a13c84bc8292a8208c"
}