{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "321722",
    "entityType": "User",
    "nonce": "0x138427ff5c5d3803e40c6807450401f01a644fc063ba074a2a38365297486576",
    "signature": "0x2851050e4e87af6dac14022d4c9feb6a737f6fc1d51796dfcae6a95a5ba0cfd1762abcd4734e99f1d3ea537b100c06c87fe9305c7f801c38fbf9d7ff485bfb711c",
    "signer": "0xdEc12eC3F7972dB51907501aF18eb17FBa37a413",
    "userId": "211416595"
  }
}