public void DeleteBlock(string blockHash)
{
SyncBlockInfo block = BlockGetByHash(blockHash);
// delete the outputs
FilterDefinition <MapTransactionAddress> addrFilter = Builders <MapTransactionAddress> .Filter.Eq(addr => addr.BlockIndex, block.BlockIndex);
MapTransactionAddress.DeleteMany(addrFilter);
// delete the transaction
FilterDefinition <MapTransactionBlock> transactionFilter = Builders <MapTransactionBlock> .Filter.Eq(info => info.BlockIndex, block.BlockIndex);
MapTransactionBlock.DeleteMany(transactionFilter);
// delete the block itself.
FilterDefinition <MapBlock> blockFilter = Builders <MapBlock> .Filter.Eq(info => info.BlockHash, blockHash);
MapBlock.DeleteOne(blockFilter);
}