Extrinsic 15271-1

{
  "heartbeat": {
    "blockNumber": 15270,
    "sessionIndex": 254,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x80db735fc5e80245a94fb36fd085cf3e1f3b510f86cd4d8e104d74f301e9c44686c38da7ef3b66d312debaf00a70f32ee81bdfc6d04060a7bdf25e79eb72dd8a"
}