[ANN] official NovaCoin thread - the original PoS+scrypt coin.

[Balthazar]

It looks like my cold wallet somehow lost around 250 NVC after downgrading..  Any way to recover these coins?

Can you send me a list of transactions?

[Balthazar]

Well... It seems that current 0.4.4.7 testing branch runs pretty stable for now. This branch is available here for public testing:

https://github.com/novacoin-project/novacoin/tree/current

Basic list of changes:

1) Pruned transactions serialization support.

Pruned transaction records are now saved into coinsDB. These records are composed of 13-14 bytes of metadata (block height, coinbase/coinstake flags, block and transaction timestamp). This resolves all syncronization issues. Though currently there is no lifetime limit for such records, cleanup for old records will be implemented in the future versions of NVC client (this cleanup will be performed after reaching the 520-blocks maturity window, I guess).

2) Conflicted transactions handling.

[Balthazar]

Spent some time to update the wiki with basic info

https://github.com/novacoin-project/novacoin/wiki/Proof-of-stake
https://github.com/novacoin-project/novacoin/wiki/Coin-Age
https://github.com/novacoin-project/novacoin/wiki/CoinDayWeight
https://github.com/novacoin-project/novacoin/wiki/Transaction

...

Hope you'll find it useful.

[svost]

http://bitcoinexaminer.org/novacoin-first-birthday/

[Balthazar]

https://github.com/novacoin-project/novacoin/pull/6

Not accepted yet, but ready for testing. It introduces metahash field which contains a hash of transaction metadata.

alex@alex-VirtualBox:~/novacoin/src$ ./novacoind gettransaction 989aaba0866c361efa36ab465a6632db23cd4ef3337984e8947b39caa4136ab8
{
    "txid" : "989aaba0866c361efa36ab465a6632db23cd4ef3337984e8947b39caa4136ab8",
   "metahash" : "391141273c9fa47a7bf52b7980aa1208aafa9453d468b6d37186a57c537066bf",
   "version" : 1,
    "time" : 1392845428,
    "locktime" : 0,
    "vin" : [
        {
            "txid" : "c63e334bbe74b1d928dcb01543353cb04026d2ae556e6876655ef074b786036e",
            "vout" : 1,
            "scriptSig" : {
                "asm" : "304402203ed3b29bdfcc1a7e55e635b855605110c540c0d8f2d2677ed184242dd2a41875022027a aa54da28e36a3e91b4da2706c3896bdddef3286dbe51a06f7e53cad04e63b01",
                "hex" : "47304402203ed3b29bdfcc1a7e55e635b855605110c540c0d8f2d2677ed184242dd2a4187502202 7aaa54da28e36a3e91b4da2706c3896bdddef3286dbe51a06f7e53cad04e63b01"
            },
            "sequence" : 4294967295
        }
    ],
    "vout" : [
        {
            "value" : 0.00000000,
            "n" : 0,
            "scriptPubKey" : {
                "asm" : "",
                "type" : "nonstandard"
            }
        },
        {
            "value" : 21.42000000,
            "n" : 1,
            "scriptPubKey" : {
                "asm" : "036ed01fdf7a5b4cacbc938a6848cce2692501d8fe997e3e42eda372638ffa3864 OP_CHECKSIG",
                "reqSigs" : 1,
                "type" : "pubkey",
                "addresses" : [
                    "4bZaUMfgS43TtXqjzPPdq9yGmPBqWpL5wu"
                ]
            }
        },
        {
            "value" : 21.43966100,
            "n" : 2,
            "scriptPubKey" : {
                "asm" : "036ed01fdf7a5b4cacbc938a6848cce2692501d8fe997e3e42eda372638ffa3864 OP_CHECKSIG",
                "reqSigs" : 1,
                "type" : "pubkey",
                "addresses" : [
                    "4bZaUMfgS43TtXqjzPPdq9yGmPBqWpL5wu"
                ]
            }
        }
    ],
    "blockhash" : "e74de7bdc3d942f6a62b1d57c748699eafd46a4b867867460bc96a8fb6e76cec",
    "confirmations" : 1
}
alex@alex-VirtualBox:~/novacoin/src$

This hash should be identical for all possible modifications of transaction.

[Tranz]

Hi Balthazar,

Just wanted to say great work on this coin, I have been scooping these up as they slide for some unknown reason.

Also I recently updated my coin(fork for NVC) to be ready to QT5. I would be more then happy to issue the same PR for NVC if you would find it useful.

Thank you and good luck.

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[Balthazar]

Also I recently updated my coin(fork for NVC) to be ready to QT5. I would be more then happy to issue the same PR for NVC if you would find it useful.

Thank you and good luck.

Yep, I seen it. Actually we are working on Qt5 too but it's not published due to recent issues with 0.4.4.7.

By the way, 0.4.4.7 branch seems pretty stable so builds are scheduled for publishing.

Also we'll update reference stratum server code to add vardiff support.

Another good way to put your scrypt hashing power, scrypt cloud mining  but payment directly in BTC, no need to trade.

http://scrypt.cc?ref=baars

What about uptime?

[Balthazar]

Protocol update: preconditions and prospects.

A new proposal for Proof-of-Work signing protocol is currently under development. It would provide stakeholders an ability to vote for Proof-of-Work blocks they've received. What is interesting, it's possible to implement without breaking a compatibility with nodes that doesn't support this protocol.

A main idea is quite simple:

1. Proof-of-Work miner submits a new block over the network;
2. New block is accepted as a "candidate" (score = 1);
3. Each node builds a deterministic list of stake generators from the past (64 items, for example);
4. Stake holder appends own signature to vchBlockSig field (currently it's not used) and then submits signed block over the network;
5. Once enough signatures collected (16 of 64, for example) new block is accepted into block chain as a "full value" block (score is equal with provided by the current proof-of-work score policy).

This process would be able to prevent malicious miner from creating a secretly pre-mined chain in order to perform 51%+ attack even if he has 99% of hashing power and significant stake volume. Because he can't collect enough signatures while keeping his chain secret.

[Balthazar]

New dns seed node is up and added to sources tree. So, currently we have

• dnsseed.novaco.in
• dnsseed.novacoin.ru
• dnsseed.novacoin.su

another one probably will be added later.

[Tranz]

Hello,

In this commit: https://github.com/novacoin-project/novacoin/commit/b9c711308fc96540c0a22c7aba0707d90460c0a1

It seems that line 394 in wallet.cpp, (CWallet::WalletUpdateSpent):

Code:

NotifyTransactionChanged(this, hash, CT_UPDATED);

Is not needed as it causes a warning:

Code:

02/22/14 08:29:22 Warning: updateWallet: Got CT_NEW, but transaction is already
in model

When returned back to CWallet::AddToWallet  and the next line try to notify transaction as new.

At least I think that is why. I commented out the new Notify and no such warning and still received notification in wallet of new block found.

[Balthazar]

Tranz, hi. Seems very interesting. This code was added to resolve some issues with balance calculation after downloading a fresh copy of blockchain. It's safe to ignore this log messages because wallet won't perform an update for already existing record.

0.4.4.6-update2 and 0.4.4.7-bugfix3 will be released today. I guess that your fix will be incorporated into next builds.

[Balthazar]

Windows nosetup builds of 0.4.4.6 update2 and 0.4.4.7 bugfix3 were published.

0.4.4.6 update2 changes list:

• Extend transaction script checkings to fight with transaction malleability issues;
• Reject connections from obsolete clients;
• New dnsseed node.

Download: [ i686 | AMD64 ]

0.4.4.7 bugfix3 changes list:

• New pruned coin approach which resolves a syncronization issue;
• Extend transaction script checkings to fight with transaction malleability issues;
• Transaction metadata hash field added to gettransaction and listtransactions RPC output;
• New dnsseed node.

Please note that 0.4.4.7 bugfix3 uses DB format which is incompatible with previous 0.4.4.7 builds.

Download: [ i686 | AMD64 ]

[Balthazar]

Some fixes were merged to resolve address book page and listtransactions issues (special thanks to svost for his investigation).

https://github.com/novacoin-project/novacoin/pull/9
https://github.com/novacoin-project/novacoin/pull/10

• Qt: fix known addressbook bugs (duplicate addresses etc.);
• Core: Avoid trying to parse outputs that aren't relevant to CWalletTx::GetAmounts;
• Core: Supress "address" key in transaction details, when the destination isn't recognized;
• Qt: copyrights update.

Windows nosetup builds:

0.4.4.6 update3: [ AMD64 | i686 ]
0.4.4.7 bugfix4: [ AMD64 | i686 ]

Linux, OS X builds and installers will be published later.

[Balthazar]

http://vps.novacoin.su/

Some copy&paste guys even unable to adjust the network ID and DNS seed addresses %) So we see a bunch of bitbar nodes in the "Forked-off" category.

[Bitinvestor]

Bitinvestor

That's quite interesting news. I have been able to reduce proof size by 30-40% only. Will see... Although the 20-30kb proof size is not a serious problem, there are a lot of transactions with even higher size (something like 100kb) due to many inputs usage. This could be handled by regular fees.

Here's a new paper about Zerocoin: "Rational Zero: Economic Security for Zerocoin with Everlasting Anonymity"

http://fc14.ifca.ai/bitcoin/papers/bitcoin14_submission_12.pdf

[Balthazar]

Thank you!

I'll try to analyze this PDF as soon as possible

[Balthazar]

http://vps.novacoin.su/

Some copy&paste guys even unable to adjust the network ID and DNS seed addresses %) So we see a bunch of bitbar nodes in the "Forked-off" category.

Forked nodes removed from dnsseed.novacoin.su database, dnsseed.novacoin.ru will be updated a bit later.

[penek]

http://vps.novacoin.su/

Some copy&paste guys even unable to adjust the network ID and DNS seed addresses %) So we see a bunch of bitbar nodes in the "Forked-off" category.

Forked nodes removed from dnsseed.novacoin.su database, dnsseed.novacoin.ru will be updated a bit later.

dnsseed.novaco.in updated too...

[ryanb]

i have a payment received on 12/31 and i haven't received stake yet

when should it stake?