{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x64ed36d3f09c9fa3db7a4111937b695be0f2f33acf2594bc209b8070ff7aad71",
    "signature": "0x252c8f79193832df8e826f541d23f2a827118f0a8fee37dcd99003202dbc3d5e6f1738d7418711290e991ae3f7e8712c3981da33b562ec07e7c69fe05a523d461c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}