Extrinsic 16489-1

{
  "heartbeat": {
    "blockNumber": 16487,
    "sessionIndex": 274,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x96103e25fb97f414ef102ebf744b0a66cc782832b53252fee534ad403df9901a82cf499a31897f34da6986d0f4507a9e2589b5c7a87959293f1d66813aa7da80"
}