{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "520381623",
    "entityType": "User",
    "nonce": "0xda8480d63ba3be6143aa90610a058d42d5d6b6c6dd32c7518547ae19e488d57f",
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    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}