{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "54123",
    "entityType": "User",
    "nonce": "0x53ec88f382d4a6be10aaf754b862d3d756b11fbfe1711ca1cae0d63001794e04",
    "signature": "0xe2c8540329e6d0351fa09cc664c2e70b735271957d7fa466edda7e7356309b97601a45faafc6e97cfdff706b89833f396b1100cfc5aa8bf0a94c44497144e7161c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}