{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x337ebcafab6434dd21f1d49ee34b07fe29a7c07ed06591dce595b28e98f82099",
    "signature": "0xce702202b0283414a517fcb928385770c4ad48f6a04be22ca51060c91d6528f7401917d27aa19f1e332438e0f20c23e699f5074819aa84908a5f97866117282b1b",
    "signer": "0x864112DB1ec7DdAB646d2db2F7ef578aF73c683f",
    "userId": "402395123"
  }
}