Extrinsic 2988-1

{
  "heartbeat": {
    "blockNumber": 2987,
    "sessionIndex": 49,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x768ae4ecd877867f672ad6dcd8b9ec8935efbe395a6be37db4e9eb6e332bbf5f8982797408caf4b306df4ae0242206b23754ecc25d19b10ee4ecb100d2c25487"
}