{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "871929900",
    "entityType": "User",
    "nonce": "0x5f8c0a2e5f738cec8f6d1a5e01b1cff0667e9024a66ac6091011c40abdd3b528",
    "signature": "0x17762ead5649d51d946251cd7f838f52b80bd46943a24f7a2fe14eb6aecc079549c615772a945fed95f27420797f73a93a7f00e1abaa63e02f4f0d02f56aa62e1c",
    "signer": "0x1F9dC682fadBAc94c0Dd4ca2232a3f490704a737",
    "userId": "737872723"
  }
}