{
  "manageEntity": {
    "action": "Update",
    "entityId": "878912730",
    "entityType": "User",
    "metadata": "{\"cid\":\"bagaaierady4letjwewfj7zrbzwj2cacgfjfamnjzn55kn6xsjhm4jhthjmka\",\"data\":{\"events\":{},\"playlist_library\":{\"contents\":[{\"type\":\"playlist\",\"playlist_id\":4281},{\"type\":\"playlist\",\"playlist_id\":1867585163}]}}}",
    "nonce": "0x66ccbf8ad3e9672401d283dbd4c0e8ee0e7fcad80e5b4600236df76b6c7a5f6a",
    "signature": "0xbdc4bd875242b8be81fe6558006890273aa780f3247c699e90316e7e5347dadd3fb75b82e413aa04094e41a66365c5085b1cbf51e7f636afa1473c40c1d0fdd11c",
    "signer": "0xd7621281d84Ae98749fd27757152B06Db54Edcc2",
    "userId": "878912730"
  }
}