{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "577440",
    "entityType": "User",
    "nonce": "0x1b9a1ab0b5bbfcf5aa8cc247fee7edfb1fa60c5ae014b7c64a4b134a5796cea2",
    "signature": "0x66d1ecfc78a77cc0db330057ecda9d287d8276230644acd9c6ba9d848004934d3f976dc9a6bc5b3b8bdc58b27b2e0cafa4ea3fc1d4ad9136fb6a446a248e474a1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}