{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4dd2f315595de0303d704a2bce1db43ecd351f6266ba0d461ca3f4a82688046f",
    "signature": "0x4d2775c3eed32dc7619439610bd1deab0b1c49e16b1405d94d44684ca68d5fe5415242b12b6c248d7aa30f72aad65dd6538d16dc8fcc6f9b38a16529bf6f17941b",
    "signer": "0x0a6438C3bA17d84444E20E5bcEA4a7b9546E2F1C",
    "userId": "301680905"
  }
}