Extrinsic 17958-1

{
  "heartbeat": {
    "blockNumber": 17957,
    "sessionIndex": 299,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x602f7ca9e5402abe5a4a63a1205c819e7938d699bff2c411a08e60a8d342087ba76fbe18aab2840e376f92232c917be53d9540b643b9060847d1a35409cdf881"
}