Extrinsic 16353-1

{
  "heartbeat": {
    "blockNumber": 16351,
    "sessionIndex": 272,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xd26c8cf62b7e6a341712a3ca450983c56fac150750ff41bf6bfb2aa6d25e01665ed45e0038709474b8289e5fbacf575907115bd0756235588312aa81857e3089"
}