{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "337999",
    "entityType": "User",
    "nonce": "0x9e6e889d9f5b63b5029007de426ed12b9994a3145e8753801bf7cc3ff1a18677",
    "signature": "0x872ade633c6f112c2f6e9a98c83054f60aaa8319d2f3e9bb0a3a61a84a40666b0a102456c1eb7972f3dc4cab56b6c69f60ea9d16231054d672b9f85bed3f7fd01c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}