felixklauke

Keybase proof

I hereby claim:

• I am FelixKlauke on github.
• I am felixklauke (https://keybase.io/felixklauke) on keybase.
• I have a public key whose fingerprint is 9B6C 45FA 099B 076C 7BED 00A1 7181 F401 CE7C 0A8E

To claim this, I am signing this object:

felixklauke

Keybase proof

I hereby claim:

• I am FelixKlauke on github.
• I am felixklauke (https://keybase.io/felixklauke) on keybase.
• I have a public key whose fingerprint is 9B6C 45FA 099B 076C 7BED 00A1 7181 F401 CE7C 0A8E

To claim this, I am signing this object:

felixklauke

private static final String VALIDATION_PREFIX = "00";

public int proofOfWork() {
    return proofOfWork(getLastBlock().getProofOfWork());
}

private int proofOfWork(int lastProof) {
    int proof = 0;

    while (!validate(lastProof, proof)) {

felixklauke

public String getHash() {
    return DigestUtils.sha256Hex(timestamp + HASH_DELIMITER + transactions.toString() + HASH_DELIMITER + previousBlockHash + HASH_DELIMITER + proofOfWork);
}

felixklauke

import org.apache.commons.codec.digest.DigestUtils;

import java.util.Collections;
import java.util.List;

/**
 * Represents one block in the chain.
 *
 * @author Felix Klauke <info@felix-klauke.de>
 */

felixklauke

/**
 * Start mining a new block.
 *
 * @return The block instance.
 */
public Block mineBlock() {
    int proofOfWork = proofOfWork();

    Block lastBlock = blocks.getLast();
    Block block = new Block(lastBlock.getIndex() + 1, lastBlock.getHas(), transactions, proofOfWork);

felixklauke

@Service
public class BlockChainService {

    private BlockChain blockChain = new BlockChain();

    public BlockChainService() {
        blockChain.addBlock(new Block(0, "", new ArrayList<>(), 0));
    }

    public void addTransaction(Transaction transaction) {

felixklauke

@RestController
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
public class BlockChainController {

    private final BlockChainService blockChainService;

    @RequestMapping(method = RequestMethod.GET, path = "/chain")
    public List<Block> requestChainContent() {
        return blockChainService.getBlockChainContent();
    }

felixklauke

@SpringBootApplication
public class SageNodeApplication {

    public static void main(String[] args) {
        SpringApplication.run(SageNodeApplication.class, args);
    }
}

felixklauke

/**
 * Providing options for low level file access using an input and an output stream.
 */
class FileSystemAccessor {

public:

    /**
     * Create a new file system accessor by passing the file we want to access under the hood.
     *