Extrinsic 17256-1

{
  "heartbeat": {
    "blockNumber": 17255,
    "sessionIndex": 287,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x4ca675e21cd4f30a1a2ff59823e6897b6530be52e61606724afdacee542d4c6443e4ae215bc070e8135e9c3268ed59e107c7a94776fe7b150a2e6db65070ea8c"
}