Extrinsic 2259-1

{
  "heartbeat": {
    "blockNumber": 2257,
    "sessionIndex": 37,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x34a258fffd09bb72f1b1c5a5cdf011eecc8e6b3ea2452dd84bdc2c9ff356af7bb7563b0811b601b5b27407108c52a3a930fb5de47577facdb5a1ac87f2b1b182"
}