Yes, you could probably do that. The API for connecting outputs with
inputs is public. And who knows, maybe we could add a "FullBlockStore"
to bitcoinj in future?
On 03/22/2017 10:57 PM, Sidd S wrote:
> Hi Andreas,
>
> Thanks for the information! At this point, I guess the solution will be
> write some code manually that will connect transaction inputs and
> outputs together to calculate those fields, which hopefully shouldn't be
> super painful.
>
> Sidd
>
> On Wednesday, March 22, 2017 at 5:42:21 PM UTC-4, Andreas Schildbach wrote:
>
> Welcome to bitcoinj!
>
> The input values and the fee is only known for transactions that were
> created by bitcoinj's Wallet (which you're likely not using anyway).
> For
> incoming transactions there values are missing, it's a known limitation
> of the Bitcoin protocol.
>
> Yes, MemoryBlockStore only stores headers. Afaik there is no block
> store
> in bitcoinj that actually stores the transactions. Bitcoinj is mainly
> designed for wallets and as a wallet you'd only keep what's relevant
> to you.
>
>
> On 03/22/2017 08:46 PM, Sidd S wrote:
> > I am new to BitcoinJ, but it seems like a good tool for building Java
> > applications around Bitcoin. I am trying to use BitcoinJ to try and
> > parse information from the blockchain. A lot of fields are pretty
> easy
> > to fetch, but I can't seem to get a couple of things.
> >
> > I'll provide some code below that I have written just to kind of give
> > some context as to the types of things I have been trying. As a
> note, I
> > am using Scala for this, but hopefully the code should be somewhat
> > intuitive.
> >
> > |
> > // importing too many things
> > import org.bitcoinj.core._
> > import org.bitcoinj.params._
> > import org.bitcoinj.utils._
> > import org.bitcoinj.store._
> > import java.io.File
> > import java.util.ArrayList
> >
> > // init
> > val params = new MainNetParams()
> > new Context(params)
> >
> > // load the blockchain files..only loading the first .dat file
> > val files = new ArrayList[File]()
> > files.add(new File("blk00000.dat"))
> > val bfl = new BlockFileLoader(params, files)
> >
> > // this line will create an array of the first 10,000 blocks
> > val b = (1 to 10000).map(_ => bfl.next)
> >
> > // trying to inspect a transaction..the outputs are below
> > val ts = b(3888).getTransactions
> > val t = ts.get(10)
> > t.getFee
> > // res34: org.bitcoinj.core.Coin = null
> > t.getInputSum
> > // res35: org.bitcoinj.core.Coin = 0
> > |
> >
> > It makes sense that I am unable to get the fee or input sum of the
> 10th
> > transaction of the 3889th block because it doesn't have a link to the
> > previous transactions. How can I add these links so I can use
> > functionality like getFee and getInputSum?
> >
> > I have tried to create a MemoryBlockStore object and BlockChain
> object
> > in hopes that these would link up the transactions, but apparently
> > StoredBlocks only store the headers of blocks but not the
> transactions
> > themselves. so I am unable to access them.
> >
> > Does anyone have any idea how I can accomplish this?
> >
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