Extrinsic 28399-1

{
  "heartbeat": {
    "blockNumber": 28398,
    "sessionIndex": 473,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x4a97797ed6b7370d09a1004191cc03c46bda231e2fbb1704937d7493794e300d41d7c595fb98937315d02477981d1a782a34bb2baf15fa8ddaa047558337728a"
}