{
  "manageEntity": {
    "action": "Save",
    "entityId": "338232720",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0a4708b2d919f3aa596f4f551e879c6eb70b462ecf027520f7add133b2d80243",
    "signature": "0x8db9f4133302d04e98f04445e61de09926fc28ac6c4cf6ced8d24d4f1bb22d7351748eeb802ed92c320483fdb7d12be1e98567274c3d8df49aeada161fc3de021c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}