I am trying to check the **balance** of a given Bitcoin address by using ***ONLY*** the locally stored blockchain (downloaded via Bitcoin Core). Something similar to this (by using NBitCoin and/or QBitNinja), but without needing access to the network:

    private static readonly QBitNinjaClient client = new QBitNinjaClient(Network.Main);

    public decimal CheckBalance(BitcoinPubKeyAddress address)
    {
        var balanceModel = client.GetBalance(address, true).Result;
        decimal balance = 0;

        if (balanceModel.Operations.Count &gt; 0)
        {
            var unspentCoins = new List&lt;Coin&gt;();
            foreach (var operation in balanceModel.Operations)
                unspentCoins.AddRange(operation.ReceivedCoins.Select(coin =&gt; coin as Coin));
            balance = unspentCoins.Sum(x =&gt; x.Amount.ToDecimal(MoneyUnit.BTC));
        }
        return balance;
    }

The example above needs access to the network. I need to do the same thing offline. I came up with something like this, but obviously it doesn&#39;t work:

    public decimal CheckBalanceLocal(BitcoinPubKeyAddress address)
    {
        var node = Node.ConnectToLocal(Network.Main);
        node.VersionHandshake();
        var chain = node.GetChain();

        var store = new BlockStore(@&quot;F:\Program Files\Bitcoin\Cache\blocks&quot;, Network.Main);
            
        var index = new IndexedBlockStore(new InMemoryNoSqlRepository(), store);
        index.ReIndex();

        var headers = chain.ToEnumerable(false).ToArray();

        var balance = (
            from header in headers
            select index.Get(header.HashBlock) 
            into block
            from tx in block.Transactions
            from txout in tx.Outputs
            where txout.ScriptPubKey.GetDestinationAddress(Network.Main) == address
            select txout.Value.ToDecimal(MoneyUnit.BTC)).Sum();
                
        return balance;
    }

 1. It hangs during the query
 2. I want something instead of `InMemoryNoSqlRepository` to be stored in a file in order to prevent using `ReIndex()` which slows everything down

My requirement is to ***Check Balance*** the same way as in the first method but by querying blocks stored on my disk.

Actually what I require might just be an answer to [this question][1]: 


  [1]: https://bitcoin.stackexchange.com/questions/50817/how-to-run-qbitninja-server-locally

Query LOCAL Bitcoin blockchain with C# .NET

I want to do my own bitcoin chart.

Would you know any reliable way to retrieve bitcoins historical price data? Is there any way to retrieve it using REST? I saw Bitfloor, which supports REST, but it is not returning any useful value, it has a &quot;internal server error&quot;.

I saw also Bitcoincharts, but I think it&#39;s limited to 2000 data values.

Would you suggest me any framework or system to work about it?

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Query LOCAL Bitcoin blockchain with C# .NET

Get bitcoin historical data