Extrinsic 15611-1

{
  "heartbeat": {
    "blockNumber": 15609,
    "sessionIndex": 260,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x66e8d2610ddf7a4f6801146de13bab80a1fc55d72b67a87e58d127df7d050a1ec985e27f9276704dfb7ae40f4939a274ed1a8ae416bab7981f723836cd17c18d"
}