{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb583417002caec91db3f4eaaf6293232acb64129eea22be73b3cc83dbcff9b39",
    "signature": "0x0684de3813888f20812fc6e3ee7dc64b8e193b2cdf8c8bb62732874adfbc8f584b0a8d5dfa142b4a790d5d3451f81f4cc37896156fd11505028f61e83d8344e31b",
    "signer": "0x7c4abA507Cb54290aeECcBF5F87e029413a20414",
    "userId": "320968767"
  }
}