{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0x59cb05eec2be167a170ea1f0f3a10a35ff82e8dfe3ff777c728ba2d86251a6e9",
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    "signer": "0xE60a1866Ef385a9995aA7FecBf375920ced75b5d",
    "userId": "890121890"
  }
}