Extrinsic 1527-1

{
  "heartbeat": {
    "blockNumber": 1525,
    "sessionIndex": 25,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x22b00b0d357e877244f2558c49f85ffebfcb40623c848e90a149813e19ac4b158812b96c06cc8fe5809ccc1bc8251eb188be866bb33498f7d8cf8898530e7a86"
}