Extrinsic 16545-1

{
  "heartbeat": {
    "blockNumber": 16544,
    "sessionIndex": 275,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x3a15a7e0ab23056ca80fdd3e88652f715a66fedf55752b051e23c312b45f0147c2f8af0a24f6e29295ff7038805e3cd2c6a6d3ad7bdbe77c3a9285ba57be4a82"
}