{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0xf9e82e843f1aaf7446d9db83fba8ee253b2c4b078601312d0a0064d48b54e131",
    "signature": "0x545aac2167d1a78e5ec6599578c26b7332705fcbde08ea031e32625943244e3b183375c99ad3e737d3934146241f77b93e9d6cca382d4939816c7d25d0c1f4981c",
    "signer": "0xDDE9075CE1320b291ed3c0ba7285d0f90DD1dFa8",
    "userId": "900721730"
  }
}