{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "738673571",
    "entityType": "User",
    "nonce": "0x821b487c2b00acb1a2a34eb17e2dc81708daf0cb48d9579961efc6c6ccf4631a",
    "signature": "0xe328ee5c82433e339e9962abcfeaaabf18cc54cf95a0f2aa9485aeab7601f8093f6053584ddc1ea451e28322e0b31cd055ff016ecfb1fe06a8f2072b38aed4f01c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}