Extrinsic 55754-1

{
  "heartbeat": {
    "blockNumber": 55753,
    "sessionIndex": 929,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x12cebf4ffe8ae2e66a6f7b05f06b5480609b07fa1763215cbbd97eabae61bf6ad9daf47a9805343a247065a53934a71c41cf6e4a65ded79a2e16e38642e7258d"
}