Extrinsic 2970-1

{
  "heartbeat": {
    "blockNumber": 2969,
    "sessionIndex": 49,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x4c7ec5b6770a8885adaf57355b42c854d3b260073f0d991abc3860cf7e31d97e78292f27638f5bbf30b7d8ebf44e3dc9653f1b3c9ccc552435819911b3bc468b"
}