{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "758409701",
    "entityType": "User",
    "nonce": "0xbb2434bf2e2179cb4f9b0c5b4c17de2b4537e5e4d16811239c3d8094dd95cf0d",
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    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}