{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x1d3136c15032095b232f0112647867c2d2eb35acf9cfa4bf2ec8bd49a70793d2",
    "signature": "0x52b52fc30c297a4759cdbd94b0cb1108251434a59758e604e620a8feadae331d5db7eece96f18efbd394d9819a5daed856eed6819be96dec71480cda7f5049301c",
    "signer": "0x7a78569646ADa00a4d555F20fA48e9cDb9ef14F5",
    "userId": "333304008"
  }
}