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Author Topic: Nxt source code  (Read 5796 times)
Come-from-Beyond (OP)
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November 29, 2013, 08:01:53 PM
 #1

I wrote this a couple of times but noone seems to paid attention.

BCNext offered to reveal any part of the code for review. He doesn't want to publish the complete code till the 3rd of January to protect Nxt against copycats.

So, if there are Java programmers who would like to view (and possibly improve) the source code, please, post ur requests here.
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November 29, 2013, 08:09:52 PM
 #2

I wrote this a couple of times but noone seems to paid attention.

BCNext offered to reveal any part of the code for review. He doesn't want to publish the complete code till the 3rd of January to protect Nxt against copycats.

So, if there are Java programmers who would like to view (and possibly improve) the source code, please, post ur requests here.
Good clever move!
Perhaps you can post it on the announcement board too, for getting wider attention.
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November 29, 2013, 08:17:26 PM
 #3

Hi come-from-beyond

That's interesting,
can you ''package'' and share an Eclipse workspace with somes java source ? we don't need all source from now because we need to protect nxt coin but some java source  can help us for understanding algorithm.

A Java J2EE project director.
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November 29, 2013, 08:20:07 PM
 #4

Hi come-from-beyond

That's interesting,
can you ''package'' and share an Eclipse workspace with somes java source ? we don't need all source from now because we need to protect nxt coin but some java source  can help us for understanding algorithm.

A Java J2EE project director.

I can't do it. Post here what part (mining algo, crypto, peer connection, etc.) u need and I'll post it here after I get it from BCNext.
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November 29, 2013, 08:27:42 PM
 #5

I see many question on forum about mining process, maybe you can post some part of this code if BCnext allow it.

 I let other java developper ask other part (crypto, etc...) ,

many thanks for help us see ''threw  the fog'' .
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November 29, 2013, 10:34:59 PM
 #6

Post here what part (mining algo, crypto, peer connection, etc.) u need and I'll post it here after I get it from BCNext.

The part that seems to need most work at the moment is the networking and the loading of the block chain, which is still not stable, isn't it? It is also probably not Nxt specific, so disclosing it is not likely to help someone clone Nxt. I could try to help debugging it.

lead Nxt developer, gpg key id: 0x811D6940E1E4240C
Nxt blockchain platform | Ardor blockchain platform | Ignis ICO
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November 29, 2013, 10:54:35 PM
 #7

I really like this move. A little community help never hurt.
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November 30, 2013, 03:16:25 AM
 #8

I would like to review the peer connection code.
Thanks
Come-from-Beyond (OP)
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November 30, 2013, 07:33:29 AM
 #9

I see many question on forum about mining process, maybe you can post some part of this code if BCnext allow it.


Part of main() method:

Code:
(new Thread() {

@Override
public void run() {

HashMap<Account, Block> lastBlocks = new HashMap<>();
HashMap<Account, BigInteger> hits = new HashMap<>();
while (state == 0) {

try {

if (bootstrappingState >= 0) {

HashMap<Account, User> unlockedAccounts = new HashMap<>();
for (User user : users.values()) {

if (user.secretPhrase != null) {

Account account = accounts.get(Account.getId(Crypto.getPublicKey(user.secretPhrase)));
if (account != null && account.getEffectiveBalance() > 0) {

unlockedAccounts.put(account, user);

}

}

}

for (Map.Entry<Account, User> unlockedAccountEntry : unlockedAccounts.entrySet()) {

Account account = unlockedAccountEntry.getKey();
User user = unlockedAccountEntry.getValue();
Block lastBlock = Block.getLastBlock();
if (lastBlocks.get(account) != lastBlock) {

byte[] generationSignature = Crypto.sign(lastBlock.generationSignature, user.secretPhrase);
byte[] generationSignatureHash = MessageDigest.getInstance("SHA-256").digest(generationSignature);
BigInteger hit = new BigInteger(1, new byte[] {generationSignatureHash[7], generationSignatureHash[6], generationSignatureHash[5], generationSignatureHash[4], generationSignatureHash[3], generationSignatureHash[2], generationSignatureHash[1], generationSignatureHash[0]});

lastBlocks.put(account, lastBlock);
hits.put(account, hit);

JSONObject response = new JSONObject();
response.put("response", "setBlockGenerationDeadline");
response.put("deadline", hit.divide(BigInteger.valueOf(Block.getBaseTarget()).multiply(BigInteger.valueOf(account.getEffectiveBalance()))).longValue() - (getEpochTime(System.currentTimeMillis()) - lastBlock.timestamp));

user.send(response);

}

int elapsedTime = getEpochTime(System.currentTimeMillis()) - lastBlock.timestamp;
if (elapsedTime > 0) {

BigInteger target = BigInteger.valueOf(Block.getBaseTarget()).multiply(BigInteger.valueOf(account.getEffectiveBalance())).multiply(BigInteger.valueOf(elapsedTime));
if (hits.get(account).compareTo(target) < 0) {

account.generateBlock(user.secretPhrase);

}

}

}

}

Thread.sleep(1000);

} catch (Exception e) {

log("9: " + e.toString());

}

}

}

}).start();


Part of Account class:

Code:
int getEffectiveBalance() {

if (height == 0) {

return (int)(balance / 100);

}

if (Block.getLastBlock().height - height < 1440) {

return 0;

}

int amount = 0;
for (long transactionId : Block.getLastBlock().transactions) {

Transaction transaction = transactions.get(transactionId);
if (transaction.recipient == id) {

amount += transaction.amount;

}

}

return (int)(balance / 100) - amount;

}


Part of Account class:

Code:
void generateBlock(String secretPhrase) throws Exception {

HashMap<Long, Transaction> newTransactions;
synchronized (transactions) {

Transaction[] sortedTransactions = unconfirmedTransactions.values().toArray(new Transaction[0]);
while (sortedTransactions.length > 0) {

int i;
for (i = 0; i < sortedTransactions.length; i++) {

Transaction transaction = sortedTransactions[i];
if (transaction.referencedTransaction != 0 && transactions.get(transaction.referencedTransaction) == null) {

sortedTransactions[i] = sortedTransactions[sortedTransactions.length - 1];
Transaction[] tmp = new Transaction[sortedTransactions.length - 1];
System.arraycopy(sortedTransactions, 0, tmp, 0, tmp.length);
sortedTransactions = tmp;

break;

}

}
if (i == sortedTransactions.length) {

break;

}

}
Arrays.sort(sortedTransactions);

newTransactions = new HashMap<>();
for (int i = 0; i < 255 && i < sortedTransactions.length; i++) {

long id = sortedTransactions[i].getId();
newTransactions.put(id, sortedTransactions[i]);

}

}

Block block = new Block(1, getEpochTime(System.currentTimeMillis()), lastBlock, newTransactions.size(), 0, 0, 0, null, Crypto.getPublicKey(secretPhrase), null, new byte[64]);
block.transactions = new long[block.numberOfTransactions];
int i = 0;
for (Map.Entry<Long, Transaction> transactionEntry : newTransactions.entrySet()) {

Transaction transaction = transactionEntry.getValue();
if (transaction.type == Transaction.TYPE_PAYMENT && transaction.subtype == Transaction.SUBTYPE_PAYMENT_ORDINARY_PAYMENT) {

block.totalAmount += transaction.amount;

}
block.totalFee += transaction.fee;
block.payloadLength += transaction.getBytes().length;
block.transactions[i++] = transactionEntry.getKey();

}

Arrays.sort(block.transactions);
MessageDigest digest = MessageDigest.getInstance("SHA-256");
for (i = 0; i < block.numberOfTransactions; i++) {

digest.update(newTransactions.get(block.transactions[i]).getBytes());

}
block.payloadHash = digest.digest();

block.generationSignature = Crypto.sign(Block.getLastBlock().generationSignature, secretPhrase);

byte[] data = block.getBytes();
byte[] data2 = new byte[data.length - 64];
System.arraycopy(data, 0, data2, 0, data2.length);
block.blockSignature = Crypto.sign(data2, secretPhrase);

ByteBuffer outputBuffer = Peer.getOutputBuffer(224 + block.payloadLength, Peer.PACKET_TYPE_NEW_BLOCK_REQUEST);

outputBuffer.put(block.getBytes());
for (i = 0; i < block.numberOfTransactions; i++) {

Transaction transaction = newTransactions.get(block.transactions[i]);
outputBuffer.put(transaction.getBytes());

}

Peer.sendToAllPeers(outputBuffer);

}


Part of Transaction class (used by Arrays.sort()):

Code:
public int compareTo(Transaction o) {

if (height < o.height) {

return -1;

} else if (height > o.height) {

return 1;

} else {

if (fee * 32768L / getBytes().length > o.fee * 32768L / o.getBytes().length) {

return -1;

} else if (fee * 32768L / getBytes().length < o.fee * 32768L / o.getBytes().length) {

return 1;

} else {

if (timestamp < o.timestamp) {

return -1;

} else if (timestamp > o.timestamp) {

return 1;

} else {

if (index < o.index) {

return -1;

} else if (index > o.index) {

return 1;

} else {

return 0;

}

}

}

}

}
Come-from-Beyond (OP)
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November 30, 2013, 07:41:59 AM
 #10

The part that seems to need most work at the moment is the networking and the loading of the block chain, which is still not stable, isn't it? It is also probably not Nxt specific, so disclosing it is not likely to help someone clone Nxt. I could try to help debugging it.

Networking is being fixed now, it will be published later.


Loading the blockchain


Part of main() method:

Code:
if (bootstrappingState >= 0) {

peer = Peer.getAnyConnectedPeer();
if (peer != null) {

setBootstrappingState(0);

ByteBuffer outputBuffer = Peer.getOutputBuffer(0, Peer.PACKET_TYPE_CUMULATIVE_DIFFICULTY_REQUEST);

peer.send(outputBuffer);

}

}


Part of Peer class:

Code:
case PACKET_TYPE_CUMULATIVE_DIFFICULTY_REQUEST:
{

byte[] cumulativeDifficulty = Block.getLastBlock().cumulativeDifficulty.toByteArray();

ByteBuffer outputBuffer = getOutputBuffer(2 + cumulativeDifficulty.length, PACKET_TYPE_CUMULATIVE_DIFFICULTY_RESPONSE);

outputBuffer.putShort((short)cumulativeDifficulty.length);
outputBuffer.put(cumulativeDifficulty);

send(outputBuffer);

}
break;

case PACKET_TYPE_CUMULATIVE_DIFFICULTY_RESPONSE:
{

if (bootstrappingState == 0) {

int cumulativeDifficultyLength = inputBuffer.getShort();
byte[] cumulativeDifficulty = new byte[cumulativeDifficultyLength];
inputBuffer.get(cumulativeDifficulty);

betterCumulativeDifficulty = new BigInteger(cumulativeDifficulty);
synchronized (blocks) {

if (betterCumulativeDifficulty.compareTo(Block.getLastBlock().cumulativeDifficulty) > 0) {

setBootstrappingState(-1);
bootstrappingPeer = this;

ByteBuffer outputBuffer = Peer.getOutputBuffer(0, PACKET_TYPE_MILESTONE_BLOCKS_REQUEST);

send(outputBuffer);

} else {

setBootstrappingState(1);

}

}

}

}
break;

case PACKET_TYPE_MILESTONE_BLOCKS_REQUEST:
{

try {

LinkedList<Long> milestoneBlocks = new LinkedList<>();

Block block = Block.getLastBlock();
int jumpLength = block.height / 4093 + 1;
while (block.height > 0) {

milestoneBlocks.add(block.getId());
for (int i = 0; i < jumpLength && block.height > 0; i++) {

block = blocks.get(block.previousBlock);

}

}

ByteBuffer outputBuffer = Peer.getOutputBuffer(2 + milestoneBlocks.size() * 8, PACKET_TYPE_MILESTONE_BLOCKS_RESPONSE);

outputBuffer.putShort((short)milestoneBlocks.size());
for (int i = 0; i < milestoneBlocks.size(); i++) {

outputBuffer.putLong(milestoneBlocks.get(i));

}

send(outputBuffer);

} catch (Exception e) {

log("12: " + e.toString());

}

}
break;

case PACKET_TYPE_MILESTONE_BLOCKS_RESPONSE:
{

if (bootstrappingState < 0) {

Block commonBlock = blocks.get(genesisBlock);

int numberOfBlocks = inputBuffer.getShort();
while (numberOfBlocks-- > 0) {

long blockId = inputBuffer.getLong();
Block block = blocks.get(blockId);
if (block != null) {

commonBlock = block;

break;

}

}

try {

ByteBuffer outputBuffer = Peer.getOutputBuffer(8, PACKET_TYPE_NEXT_BLOCK_IDS_REQUEST);

lastCommonBlock = commonBlock.getId();
outputBuffer.putLong(lastCommonBlock);

send(outputBuffer);

} catch (Exception e) {

log("13: " + e.toString());

}

}

}
break;

case PACKET_TYPE_NEXT_BLOCK_IDS_REQUEST:
{

try {

LinkedList<Long> nextBlocks = new LinkedList<>();

Block block = blocks.get(inputBuffer.getLong());

while (block != null && nextBlocks.size() < 4093) {

block = blocks.get(block.nextBlock);
if (block != null) {

nextBlocks.add(block.getId());

}

}

ByteBuffer outputBuffer = Peer.getOutputBuffer(2 + nextBlocks.size() * 8, PACKET_TYPE_NEXT_BLOCK_IDS_RESPONSE);

outputBuffer.putShort((short)nextBlocks.size());
for (int i = 0; i < nextBlocks.size(); i++) {

outputBuffer.putLong(nextBlocks.get(i));

}

send(outputBuffer);

} catch (Exception e) {

log("14: " + e.toString());

}

}
break;

case PACKET_TYPE_NEXT_BLOCK_IDS_RESPONSE:
{

if (bootstrappingState < 0) {

int numberOfBlocks = inputBuffer.getShort();
if (numberOfBlocks == 0) {

setBootstrappingState(1);

break;

}

long blockId;
while (numberOfBlocks-- > 0) {

blockId = inputBuffer.getLong();
if (blocks.get(blockId) == null) {

break;

}

lastCommonBlock = blockId;

}

if (numberOfBlocks < 0) {

ByteBuffer outputBuffer = Peer.getOutputBuffer(8, PACKET_TYPE_NEXT_BLOCK_IDS_REQUEST);

outputBuffer.putLong(lastCommonBlock);

send(outputBuffer);

} else {

if (Block.getLastBlock().height - blocks.get(lastCommonBlock).height > 720) {

setBootstrappingState(1);

} else {

while (lastBlock != lastCommonBlock && Block.popLastBlock()) { }

if (lastBlock == lastCommonBlock) {

ByteBuffer outputBuffer = Peer.getOutputBuffer(8, PACKET_TYPE_NEXT_BLOCKS_REQUEST);

outputBuffer.putLong(lastBlock);

send(outputBuffer);

} else {

setBootstrappingState(1);

}

}

}

}

}
break;

case PACKET_TYPE_NEXT_BLOCKS_REQUEST:
{

LinkedList<Block> nextBlocks = new LinkedList<>();
int totalLength = 0;

Block block = blocks.get(inputBuffer.getLong());

while (block != null) {

block = blocks.get(block.nextBlock);
if (block != null) {

int length = 224 + block.payloadLength;
if (totalLength + length > 32768 - (8 + 2)) {

break;

}

nextBlocks.add(block);
totalLength += length;

}

}

ByteBuffer outputBuffer = Peer.getOutputBuffer(2 + totalLength, PACKET_TYPE_NEXT_BLOCKS_RESPONSE);

outputBuffer.putShort((short)nextBlocks.size());
for (int i = 0; i < nextBlocks.size(); i++) {

block = nextBlocks.get(i);
outputBuffer.put(block.getBytes());
for (int j = 0; j < block.numberOfTransactions; j++) {

outputBuffer.put(transactions.get(block.transactions[j]).getBytes());

}

}

send(outputBuffer);

}
break;

case PACKET_TYPE_NEXT_BLOCKS_RESPONSE:
{

if (bootstrappingState < 0) {

int numberOfBlocks = inputBuffer.getShort();
if (numberOfBlocks == 0) {

setBootstrappingState(1);

break;

}

while (numberOfBlocks-- > 0) {

if (!Block.pushBlock(inputBuffer)) {

break;

}

}

ByteBuffer outputBuffer = Peer.getOutputBuffer(8, PACKET_TYPE_NEXT_BLOCKS_REQUEST);

outputBuffer.putLong(lastBlock);

send(outputBuffer);

}

}
break;
Come-from-Beyond (OP)
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November 30, 2013, 07:44:51 AM
 #11

I would like to review the peer connection code.
Thanks

Yesterday I found a problem related to peer connection implementation - https://bitcointalk.org/index.php?topic=345619.msg3771678#msg3771678

BCNext is working on fixing the issue. Updated code will be published later.
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November 30, 2013, 07:49:16 AM
 #12

I see many question on forum about mining process, maybe you can post some part of this code if BCnext allow it.


thanks
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December 01, 2013, 10:15:09 AM
 #13

Where is the block and transaction verification done?

This is the part I'm most interested in.

For example, I could, in theory have a few NXT coins, and simply by changing my clock ahead a several days, could I not in theory generate a new block?

As per,
Code:
int elapsedTime = getEpochTime(System.currentTimeMillis()) - lastBlock.timestamp;
if (elapsedTime > 0) {
    
    BigInteger target = BigInteger.valueOf(Block.getBaseTarget()).multiply(BigInteger.valueOf(account.getEffectiveBalance())).multiply(BigInteger.valueOf(elapsedTime));
    if (hits.get(account).compareTo(target) < 0) {
        
        account.generateBlock(user.secretPhrase);
        
    }
    
}

you need at least one coin, but the entire value of the base target and balance is multiplied by the difference between the current time (in milliseconds) and the lastBlock. How is this enforced on other clients? How do they know that the time I'm generating is in fact valid?

I realize there's time synchronization/rejection going on, but I'd like some clarification. Is the time verification done separately from transaction and block verification?

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December 01, 2013, 10:28:32 AM
 #14

Where is the block and transaction verification done?

Asked for that code.


For example, I could, in theory have a few NXT coins, and simply by changing my clock ahead a several days, could I not in theory generate a new block?

All blocks with timestamps in the future r ignored.
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December 01, 2013, 10:53:04 AM
 #15

Where is the block and transaction verification done?

Asked for that code.


For example, I could, in theory have a few NXT coins, and simply by changing my clock ahead a several days, could I not in theory generate a new block?

All blocks with timestamps in the future r ignored.

Right, I was implying that you set the time ahead enough so that generateBlock() is called, however, once in this method, revert the time back so when
Code:

Block block = new Block(1, getEpochTime(System.currentTimeMillis()), lastBlock, newTransactions.size(), 0, 0, 0, null, Crypto.getPublicKey(secretPhrase), null, new byte[64]);
is called, the system time is correct. This falsely creates a "valid" block.

This would be trivial to do in any modern debugger.

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December 01, 2013, 10:58:17 AM
 #16

Right, I was implying that you set the time ahead enough so that generateBlock() is called, however, once in this method, revert the time back so when
Code:

Block block = new Block(1, getEpochTime(System.currentTimeMillis()), lastBlock, newTransactions.size(), 0, 0, 0, null, Crypto.getPublicKey(secretPhrase), null, new byte[64]);
is called, the system time is correct. This falsely creates a "valid" block.

This would be trivial to do in any modern debugger.

Such a block won't pass validation.
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December 02, 2013, 01:46:10 AM
 #17

There is not a single comment in the code,
this is very bad for the future ...
extortion
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December 02, 2013, 04:11:26 AM
 #18

non existent cryptocurrencies, because hey, why not?

Extortion. We are Anonymous. We are legion. We do not forgive. We Do Not Forget. Expect Us.
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December 02, 2013, 07:54:02 AM
 #19

There is not a single comment in the code,
this is very bad for the future ...

Hardcore programmers don't bother with commenting.  Grin
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December 02, 2013, 08:44:41 AM
 #20

There is not a single comment in the code,
this is very bad for the future ...

Hardcore programmers don't bother with commenting.  Grin
LOL  Grin
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December 02, 2013, 01:42:28 PM
 #21

There is not a single comment in the code,
this is very bad for the future ...

Hardcore programmers don't bother with commenting.  Grin

Only beginner think not commenting is hardcore programming.

Sustainable software need comment, and open source one need even more !
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December 02, 2013, 01:44:23 PM
 #22

Only beginner think not commenting is hardcore programming.

Sustainable software need comment, and open source one need even more !

Agree. That was just a sarcasm.
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December 02, 2013, 02:15:18 PM
 #23

Only beginner think not commenting is hardcore programming.

Sustainable software need comment, and open source one need even more !

Agree. That was just a sarcasm.

Ok, sorry, wasn't sure Smiley
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December 03, 2013, 12:19:58 PM
 #24

There is not a single comment in the code,
this is very bad for the future ...

All constant values are hardcoded. Its better to segregate them into a separate class (or) define them at class level.
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December 03, 2013, 12:57:13 PM
 #25

There is not a single comment in the code,
this is very bad for the future ...

All constant values are hardcoded. Its better to segregate them into a separate class (or) define them at class level.

R u talking about values like 1440, 720, 60? They r set in stone.
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December 03, 2013, 01:12:51 PM
 #26

There is not a single comment in the code,
this is very bad for the future ...

All constant values are hardcoded. Its better to segregate them into a separate class (or) define them at class level.

R u talking about values like 1440, 720, 60? They r set in stone.

I think he meant more using enums or constants so they have more meaningful context. The number 1440 by itself doesn't really have any meaning but if it's labeled BLOCK_NUMBER or something it's easier to understand it's purpose.

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December 03, 2013, 01:19:34 PM
 #27

I think he meant more using enums or constants so they have more meaningful context. The number 1440 by itself doesn't really have any meaning but if it's labeled BLOCK_NUMBER or something it's easier to understand it's purpose.

Ah, I see.
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December 03, 2013, 09:16:19 PM
 #28

hi cfb

that is the meaning of variables height ? is it :
for the blockchain : the last block actually ''mining'' or compute for the whole blockchain
and for a personal account : the number of block compute since the account unlocked for the first time



By example : Nxt start on 24 november :
Hypothesis : 1440 block compute per day
Suppose we are now 28 november midnight and i unlocked my account for the first time on 27 november at 0 am after midnight:
height of blockchain is 1440 * 4 days = 5760 (blocks since the start of nxt currency)
height of my account is 1440 * 2 days = 2880 (block since the first unlocked of my account)



I hope i'm clear ....

thanks
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December 03, 2013, 09:19:13 PM
 #29

hi cfb

that is the meaning of variables height ? is it :
for the blockchain : the last block actually ''mining'' or compute for the whole blockchain
and for a personal account : the number of block compute since the account unlocked for the first time

?  

By example : Nxt start on 24 november :
Hypothesis : 1440 block compute per day
Suppose we are now 28 november midnight and i unlocked my account for the first time on 27 november at 0 am after midnight:
height of blockchain is 1440 * 4 days = 5760 (blocks since the start of nxt currency)
height of my account is 1440 * 2 days = 2880 (block since the first unlocked of my account)



I hope i'm clear ....

thanks

Height = number of a block counting Genesis block as Height 0. Accounts have nothing to do with block height.
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December 05, 2013, 03:21:02 PM
 #30

Im a java dev (not too proficient , mainly php but java too).

im a little bit surprised about the choice to make a web application with localhost browser connectivity and not some desktop application.

the java language i think its a good choice cause clients can go native in android too.
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December 06, 2013, 12:05:31 PM
 #31

If possible I want to review address generation algo, I find the domain of 10^20 is way less secure than 34 char in Base58 encoding.... I started to think I can bruteforce wallets....

Will take me a while to climb up again, But where is a will, there is a way...
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December 06, 2013, 12:17:19 PM
 #32

If possible I want to review address generation algo, I find the domain of 10^20 is way less secure than 34 char in Base58 encoding.... I started to think I can bruteforce wallets....

https://bitcointalk.org/index.php?topic=345619.msg3759147#msg3759147
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December 06, 2013, 02:32:43 PM
 #33

If possible I want to review address generation algo, I find the domain of 10^20 is way less secure than 34 char in Base58 encoding.... I started to think I can bruteforce wallets....

https://bitcointalk.org/index.php?topic=345619.msg3759147#msg3759147

Cool, thnx

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December 24, 2013, 08:38:16 PM
 #34

WTF?

It's a webapp with a bit of code that appears to manage the block chain.

What is the P2P protocol used?  What is on the payload?

How are peers discovered?

Are people actually investing real money on this prototype?

Too many open questions.

Well, lucky for the folks who invested 21 BTC to own all of the coin!

Code like bitcoinj (written in java) doesn't even cover wallets and mining and its like 20 times bigger than the code we find here for NXT.

Is this a complete joke?

I don't see any specialized libraries for networking (i.e. Protobuf etc).

 
                                . ██████████.
                              .████████████████.
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       ..████████████████████████████████████████████████████████████..
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December 24, 2013, 08:53:16 PM
 #35

WTF?

Hi


It's a webapp with a bit of code that appears to manage the block chain.

It's a Java servlet that runs in a servlet container


What is the P2P protocol used?  What is on the payload?

JSON over HTTP with custom protocol. Set "communicationLoggingMask" to "7" in nxt/webapps/root/WEB-INF/web.xml to see all the payload.


How are peers discovered?

Each node has a set of well-known peers (listed in web.xml and easily changed by a user). Upon a launch a node connects to these peers and gets other peers via "getPeers" request.


Are people actually investing real money on this prototype?

Yes, but this is not a prototype.


Too many open questions.

Feel free to ask all of them.


Well, lucky for the folks who invested 21 BTC to own all of the coin!

This is impossible to launch a secure 100% PoS currency without distribution of all coins at once.


Code like bitcoinj (written in java) doesn't even cover wallets and mining and its like 20 times bigger than the code we find here for NXT.

Coz bitcoinj is an application, in Nxt most of the work is done by the container (Jetty)


Is this a complete joke?

No. This is an innovative cryptoplatform where payment transactions is just 1% of all the features.


I don't see any specialized libraries for networking (i.e. Protobuf etc).

Coz most of the work is done by the container (Jetty) and Java Virtual Machine.
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December 24, 2013, 09:01:07 PM
 #36

WTF?

Hi


It's a webapp with a bit of code that appears to manage the block chain.

It's a Java servlet that runs in a servlet container


What is the P2P protocol used?  What is on the payload?

JSON over HTTP with custom protocol. Set "communicationLoggingMask" to "7" in nxt/webapps/root/WEB-INF/web.xml to see all the payload.


How are peers discovered?

Each node has a set of well-known peers (listed in web.xml and easily changed by a user). Upon a launch a node connects to these peers and gets other peers via "getPeers" request.


Are people actually investing real money on this prototype?

Yes, but this is not a prototype.


Too many open questions.

Feel free to ask all of them.


Well, lucky for the folks who invested 21 BTC to own all of the coin!

This is impossible to launch a secure 100% PoS currency without distribution of all coins at once.


Code like bitcoinj (written in java) doesn't even cover wallets and mining and its like 20 times bigger than the code we find here for NXT.

Coz bitcoinj is an application, in Nxt most of the work is done by the container (Jetty)


Is this a complete joke?

No. This is an innovative cryptoplatform where payment transactions is just 1% of all the features.


I don't see any specialized libraries for networking (i.e. Protobuf etc).


Coz most of the work is done by the container (Jetty) and Java Virtual Machine.


So it actually is a centralized currency?  

What is the distributed consensus mechanism?  What prevents attack?

I mean,  anyone can implement similar by grabbing a open transaction server and issuing 100 million coins.

Oh well!!!  

Suckers born every minute.

 
                                . ██████████.
                              .████████████████.
                           .██████████████████████.
                        -█████████████████████████████
                     .██████████████████████████████████.
                  -█████████████████████████████████████████
               -███████████████████████████████████████████████
           .-█████████████████████████████████████████████████████.
        .████████████████████████████████████████████████████████████
       .██████████████████████████████████████████████████████████████.
       .██████████████████████████████████████████████████████████████.
       ..████████████████████████████████████████████████████████████..
       .   .██████████████████████████████████████████████████████.
       .      .████████████████████████████████████████████████.

       .       .██████████████████████████████████████████████
       .    ██████████████████████████████████████████████████████
       .█████████████████████████████████████████████████████████████.
        .███████████████████████████████████████████████████████████
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                                   █████████
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December 24, 2013, 09:08:06 PM
 #37

WTF?

Hi


It's a webapp with a bit of code that appears to manage the block chain.

It's a Java servlet that runs in a servlet container


What is the P2P protocol used?  What is on the payload?

JSON over HTTP with custom protocol. Set "communicationLoggingMask" to "7" in nxt/webapps/root/WEB-INF/web.xml to see all the payload.


How are peers discovered?

Each node has a set of well-known peers (listed in web.xml and easily changed by a user). Upon a launch a node connects to these peers and gets other peers via "getPeers" request.


Are people actually investing real money on this prototype?

Yes, but this is not a prototype.


Too many open questions.

Feel free to ask all of them.


Well, lucky for the folks who invested 21 BTC to own all of the coin!

This is impossible to launch a secure 100% PoS currency without distribution of all coins at once.


Code like bitcoinj (written in java) doesn't even cover wallets and mining and its like 20 times bigger than the code we find here for NXT.

Coz bitcoinj is an application, in Nxt most of the work is done by the container (Jetty)


Is this a complete joke?

No. This is an innovative cryptoplatform where payment transactions is just 1% of all the features.


I don't see any specialized libraries for networking (i.e. Protobuf etc).


Coz most of the work is done by the container (Jetty) and Java Virtual Machine.


So it actually is a centralized currency?  

What is the distributed consensus mechanism?  What prevents attack?

I mean,  anyone can implement similar by grabbing a open transaction server and issuing 100 million coins.

Oh well!!!  

Suckers born every minute.

You are lucky stupidity is centralised as a callus on your brain and it can be removed easily!
Ignore <- Ignore + 1
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December 24, 2013, 09:34:09 PM
 #38

So it actually is a centralized currency?  

No. It's decentralized cryptoplatform where currency is only 1% of its features.


What is the distributed consensus mechanism?  What prevents attack?

The same as in Bitcoin. Replace coins with ASICs and think of Bitcoin.


I mean,  anyone can implement similar by grabbing a open transaction server and issuing 100 million coins.

I think u r wrong.


Oh well!!!  

...


Suckers born every minute.

Thank u for ur competent opinion.
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