{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "521",
    "entityType": "User",
    "nonce": "0xeb8eaf9b910a5c0713e5aa19365f75a4ec7b6f0b677dcefde2e0a3a670cb192e",
    "signature": "0x750d2f3aa1e1897da3ff9ef4cbc068aaac87d119a1340ea8a26d5fcd23ac13e022bbf3f681fe9391af3fe079abebc66b83ac34f4bc5e04f6c8c2e8631e7464961b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}