{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x010bafcf76d5e16b0cdc88af191bedd382fc930fcc1ea6dee60a8281527f948e",
    "signature": "0x1efa3721dd5269bf07b8a972fd2244b248ed690c0e2ba808aea319ddb4b663ac10f01433be911c65cbf81a3afbf6dfc7144105e0ee94f46b0d41643be1fc6b631c",
    "signer": "0xDC0E429635d75aeB6373933a78FB105Ed331D26c",
    "userId": "973551328"
  }
}