{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "821853407",
    "entityType": "User",
    "nonce": "0xc558077462e7e19e7ff7485ef89de7370f10d5a226583c71545928143283ce50",
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    "signer": "0x9765cbE8e26a2c6c4847C1B69ABeB0B5250EC254",
    "userId": "678556080"
  }
}