{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5122f7c80823ca74c7f0dfc016ea4c59d1f44183e0dd368ec2b7ebddf5c6a781",
    "signature": "0x3d23d17214bde235bb52d25839b206aa7608d6fe80c190b4b9ee23b12db04bc90298624dc44c032c96d81496c1cdf4f582a1ac4d07bb21ec5a315d43ef510d8c1c",
    "signer": "0x4Bf2b7Bb40dCa2050F09c1299FB9367c6Bda576c",
    "userId": "822766281"
  }
}