{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0xf03ff2be1cafe117fb11cf9d77e4011e60db2e6061204d5db285578187a33b87",
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    "signer": "0xB37e68c133ea69671cCAC0650D43A5e87451094c",
    "userId": "513109515"
  }
}