{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x28fedf63feb4d610f80fd58222158fc324d4c55ca6b2c59574094557215e614f",
    "signature": "0x98c738d02ac678fb22d5a0ce4d70eae56776b41219b195def329bd48d2f1ea3841ba936bbaf51df70d1b0621b37c8bd4d334b73942b0f6d9487f808caf4632be1b",
    "signer": "0xfe35D684b147C8245614c924bc9fb68A6B5E4116",
    "userId": "994921318"
  }
}