Extrinsic 12941-1

{
  "heartbeat": {
    "blockNumber": 12940,
    "sessionIndex": 215,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x846d90ed57474c2a2a2943e30a937d484911cce4967f5f7e219612490db3c33366b683f6499bca9f198bd173e090a8f8591b50cfeb6c5aec2e31682e62c66386"
}