{
  "manageEntity": {
    "action": "Update",
    "entityId": "789943876",
    "entityType": "User",
    "metadata": "{\"cid\":\"bagaaieraox3of25elaa3bsemwnq5hfeedb6fkgthm4hivwzga2zonyujoima\",\"data\":{\"events\":{},\"playlist_library\":{\"contents\":[{\"type\":\"playlist\",\"playlist_id\":4281},{\"type\":\"playlist\",\"playlist_id\":756150589}]}}}",
    "nonce": "0xdcb81becdaf8ff8e76c3b84a4cd339a92affcf368b73c69c9896150f68757489",
    "signature": "0x3769487db3b5133484bcc7e37ec85469e71c41f94b05a1403ab4f707497562d866eccbd4e6f859503dacbe95ccfa69e7a66e8429a67f6e3be943527e261ecbca1c",
    "signer": "0xFFC9aBF947cE66c4C6010896E94Cfed7D7FE538f",
    "userId": "789943876"
  }
}