Extrinsic 17504-1

{
  "heartbeat": {
    "blockNumber": 17503,
    "sessionIndex": 291,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x7e270339a6c38a34b367ef796aedbf42ef1b5ef939c7f0f398f35343b426696002334414435df6d66b0b3744b3703da15dcdc3869b01fb64b9b10cb7541f7d8a"
}