{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0cfcab8914575a124e13e71ca8f8d1f19b583bc5fcbe3dc214a00b3169cd2022",
    "signature": "0x1eaae5ee45aa057bb1964175c588276221db8697ddda52ed7f8a2751caf81a9100238505acc0ded5417ab3861e32feffd218207cdedbbb1933d3fb757f5b9cab1b",
    "signer": "0xa57b4357994d735DB3Db20349Ac21e880472e94D",
    "userId": "521443517"
  }
}