Extrinsic 17987-1

{
  "heartbeat": {
    "blockNumber": 17985,
    "sessionIndex": 299,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x448456dc8290d72d7cf2d0a739ba55abc6a451629e196eb953b84b842b175e6cc63dcf6d1e24f5d25b3a6eb365b46d0a9539bee515b29db8b55985fbc1f46a87"
}