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Query LOCAL Bitcoin blockchain with C# .NET

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 > 0)
{
var unspentCoins = new List<Coin>();
foreach (var operation in balanceModel.Operations)
unspentCoins.AddRange(operation.ReceivedCoins.Select(coin => coin as Coin));
balance = unspentCoins.Sum(x => 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't work:

public decimal CheckBalanceLocal(BitcoinPubKeyAddress address)
{
var node = Node.ConnectToLocal(Network.Main);
node.VersionHandshake();
var chain = node.GetChain();

var store = new BlockStore(@"F:Program FilesBitcoinCacheblocks", 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;
}


InMemoryNoSqlRepository

ReIndex()

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 Answer
1

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