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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