Built during the 2019 BTCR Hackathon August 5th - 9th 2019.

BTC TX Lookup

This library supports looking up Bitcoin transactions by TXREF and TXID, as well as looking up information specific to the BTCR DID method.

It can use the following sources for lookups:

• Blockcypher API - see BlockcypherAPIBitcoinConnection.java
• Bitcoind JSON-RPC - see BitcoindRPCBitcoinConnection.java
• BTCD JSON-RPC - see BTCDRPCBitcoinConnection.java
• Bitcoinj SPV - see BitcoinjSPVBitcoinConnection.java (not implemented)

This library uses libbech32-java and libtxref-java as dependencies for support of Bech32 Encoded Tx Position References.

It supersedes the earlier txref-conversion-java library.

It is used by the BTCR DID driver of the DIF Universal Resolver.

Maven

Build:

mvn clean install

Dependency:

<dependency>
	<groupId>info.weboftrust</groupId>
	<artifactId>btc-tx-lookup-java</artifactId>
	<version>1.0.0</version>
	<scope>compile</scope>
</dependency>

Examples

Lookup a TXREF by TXID

import info.weboftrust.btctxlookup.Chain;
import info.weboftrust.btctxlookup.bitcoinconnection.BitcoinConnection;
import info.weboftrust.btctxlookup.bitcoinconnection.BlockcypherAPIBitcoinConnection;

public class Test {

	public static void main(String[] args) throws Exception {

		BitcoinConnection bitcoinConnection = BlockcypherAPIBitcoinConnection.get();
		String txref = bitcoinConnection.toTxref(Chain.MAINNET, "016b71d9ec62709656504f1282bb81f7acf998df025e54bd68ea33129d8a425b");
		System.out.println(txref); // expect "tx1:rk63-uqnf-zscg-527"
	}
}

Lookup a TXID by TXREF

import info.weboftrust.btctxlookup.ChainAndTxid;
import info.weboftrust.btctxlookup.bitcoinconnection.BitcoinConnection;
import info.weboftrust.btctxlookup.bitcoinconnection.BlockcypherAPIBitcoinConnection;

public class Test {

	public static void main(String[] args) throws Exception {

		BitcoinConnection bitcoinConnection = BlockcypherAPIBitcoinConnection.get();
		ChainAndTxid chainAndTxid = bitcoinConnection.fromTxref("txtest1:xyv2-xzpq-q9wa-p7t");
		System.out.println(chainAndTxid.getChain()); // expect "TESTNET"
		System.out.println(chainAndTxid.getTxid()); // expect "f8cdaff3ebd9e862ed5885f8975489090595abe1470397f79780ead1c7528107"
	}
}

About

Rebooting Web-of-Trust - http://www.weboftrust.info/

Markus Sabadello, Danube Tech - https://danubetech.com/

Supported by NLnet and NGI0 PET, which is made possible with financial support from the European Commission's Next Generation Internet programme.