Extrinsic 17866-1

{
  "heartbeat": {
    "blockNumber": 17865,
    "sessionIndex": 297,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x76c1e28ca67cc92171f86ac1739632ee06a80b001769489756a38b5738fad811f2be0c81d9ccd5811b0c49a6af8a2eb51aeb265115f8c9a076ba33faf63dc484"
}