{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x611fa79036bc9e45b6096213c76ff2cbe1d8e10719b54e6c167087fc16102729",
    "signature": "0x90e74d240c987136bc9a1d093ad900c1d576cd74a4d78393d88fffde84179e7a4bb18291a38f1c06112042deacde2b381cbb1505587b7efd202d950f06cd62661c",
    "signer": "0x81D9b66F41a39d445c8239101a100000F762a789",
    "userId": "866140898"
  }
}