This is an implementation of an SPV node on the Bitcoin network using Scala & Bitcoin-S-Core.
Our implementation relies heavily on Akka, which has an implementation of the Actor model in Scala. If you want to read more about Akka and what it is/how it is used, it is best to start reading here.
Look inside of Main.scala for example of creating a PaymentActor, that montiors an address. Once a transaction that pays to the address is included in a block, it sends a message back to your actor saying a payment was successful.
package org.bitcoins.spvnode
import org.bitcoins.core.config.TestNet3
import org.bitcoins.core.crypto.{DoubleSha256Digest, Sha256Hash160Digest}
import org.bitcoins.core.protocol.blockchain.TestNetChainParams
import org.bitcoins.core.protocol.{BitcoinAddress, P2PKHAddress}
import org.bitcoins.core.util.BitcoinSUtil
import org.bitcoins.spvnode.constant.Constants
import org.bitcoins.spvnode.networking.PaymentActor
import org.bitcoins.spvnode.networking.sync.BlockHeaderSyncActor
/**
* Created by chris on 8/29/16.
*/
object Main extends App {
override def main(args : Array[String]) = {
val blockHeaderSyncActor = BlockHeaderSyncActor(Constants.actorSystem)
val gensisBlockHash = TestNetChainParams.genesisBlock.blockHeader.hash
val startHeader = BlockHeaderSyncActor.StartHeaders(Seq(gensisBlockHash))
blockHeaderSyncActor ! startHeader
}
}If you want to see more logging for the networking stuff, adjust your logback.xml file to DEBUG.
After that, you are ready to fire up your spv node with this command:
chris@chris-870Z5E-880Z5E-680Z5E:~/dev/bitcoins-spv-node$ sbt runAfter that, you should start seeing headers being synced to your node. The headers are stored inside of a file called block_headers.dat file inside of src/main/resources. Note that this does not use any checkpointing system, so to sync up all ~930,000 headers on TestNet3 will take awhile.
For more information on how we store block headers in our spv node, please read database_documentation
For more information on syncing our node with the peer to peer network, please read header_sync