{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "879612668",
    "entityType": "User",
    "nonce": "0xfca72415d0536541ec36099ab3c989527afe4d29855965655b1800e746c6191f",
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    "signer": "0x21Fd9B00abe46D332aD583DED844CE1b04f07047",
    "userId": "397438294"
  }
}