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61  Bitcoin / Development & Technical Discussion / Re: Any p2p exchanges on: March 10, 2014, 03:22:32 AM
Wont't P2P exchanges bloat the blockchain even more?

Nope, CounterParty (XCP) P2P DEX currently uses multisig transactions as a means of escrow, with advent of Bitcoin 0.9 it will transition seamlessly to implementing OP_RETURN which can be pruned

But it will still be put onto the blockchain, a full node would still need it.
62  Bitcoin / Development & Technical Discussion / Re: Any p2p exchanges on: March 09, 2014, 11:12:06 PM
Wont't P2P exchanges bloat the blockchain even more?
63  Bitcoin / Development & Technical Discussion / Re: some questions about 51% attack and hash power on: March 08, 2014, 09:12:24 PM
There's nothing explicitly wrong with having 51% of the hashpower, you could use it to mine every block for the duration of your majority and that would be the end of it.

But, you could also use it to remine old blocks and mess with the transaction history and screw people over for the fun of it.

But at the most you'd have an advantage for just a little while, more miners would join and your majority would be removed.
64  Bitcoin / Development & Technical Discussion / Re: How would a node detect a reorganization/orphan of the blockchain? on: March 08, 2014, 08:52:58 PM
A full node should be able to see every blockchain, sans the possibility of some MITM attacks.

What if the node is more like a 9/10ths node?

If you don't download the full copy of the blockchain you're not considered a full node. In that case(you download just the block headers) you're susceptible to sybil attack by some entities controlling more than 50% of the hashpower feeding you the wrong chain.
Is there any way to defend against a sybil attack if I don't download every transaction, I do have some transactions, but not all of them?

How does a full node defend against an attacker with >50% of the hashpower?
65  Bitcoin / Development & Technical Discussion / Re: How would a node detect a reorganization/orphan of the blockchain? on: March 08, 2014, 11:54:08 AM
A full node should be able to see every blockchain, sans the possibility of some MITM attacks.

What if the node is more like a 9/10ths node?
66  Bitcoin / Development & Technical Discussion / Re: Removing the possibility of duplicate private keys on: March 08, 2014, 01:54:08 AM
If you really believe it to be a problem, 2 of 3 transactions double the key requirement, meaning they'd have to get 2 instead of just 1 keys to spend anything.
67  Bitcoin / Development & Technical Discussion / How would a node detect a reorganization/orphan of the blockchain? on: March 08, 2014, 01:51:47 AM
Such as it was downloading the wrong chain, and suddenly the chain ends?

Like if 2-3 blocks back was suddenly marked as orphaned, how would the qt client understand this had happened?
68  Bitcoin / Development & Technical Discussion / Re: When will nodes forward doublespends based on fee? on: March 06, 2014, 02:07:51 PM
Nodes? why would they?

Miners— well maybe some already are. How could you tell?
In case you had a legitimate reason to change the destination of your coins.

I just think there should be an official feature of the protocol that breaks trust in unconfirmed txs.

Because if mining nodes don't already behave this way, they most certainly will eventually. Better to ween the network off 0 confs early rather than later.
69  Bitcoin / Bitcoin Discussion / Re: When does it become fraud? The ethics of bitcoin mining and zero-confirm TXs on: March 06, 2014, 07:07:08 AM
A merchant should not rely on unconfirmed transactions ever.
70  Bitcoin / Development & Technical Discussion / Re: When will nodes forward doublespends based on fee? on: March 06, 2014, 06:15:05 AM
Miners should be viewed as profit driven entities.

They have a negative incentive to relay transactions, which means you can't depend on being peered with them to hear about transactions. A doublespend is as easy as sending one tx to the miner, and one to the merchant, the miner has no incentive to relay the transaction, so the merchant may never hear about it until it is in the blockchain, and they are out of a payment.

It is for this reason that it should be a standard to break trust in 0conf transactions, because eventually miners will stop relaying transactions so they alone are able to mine the fees.
71  Bitcoin / Development & Technical Discussion / When will nodes forward doublespends based on fee? on: March 04, 2014, 06:59:59 PM
We need to move away from the mindset that zero confirmation transactions are safe.

Miners will eventually start to prioritize what to include by the fee it gives them, which is exactly what they should be doing. Even if that were to nullify another unconfirmed transaction, the one which gives the most to the network (miners) is the one that should be included.
72  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin Release - First Scientific Computing Cryptocurrency on: October 28, 2013, 03:54:00 PM
Hey guys, I have a few questions. I would be happy, if someone could answer me these.

So I find Primecoin very intereseting. As far as I understand, the work of proof works as follows(I read the paper): I have to find a prime chain with a certain length (9.93 at the moment) and the prime origin has to be divied by the hash of the last block. So my question is: For me as miner wouldn't it be the easiest way to find chains of the length of 9.95 all the time and save them persisetent and then just buy a lot of RAM to put the list in there and then just test to find the right divident to the last hash? Wouldn't that be much faster than try to find new prime chains all the time?

So then I tried it on block 200 000:
http://primecoin.21stcenturymoneytalk.org/index.php

The prime origin (decimal) is:
8714709782728338749181494073917835353396414535327396757824121441708798494550544 8916205980486400
The hash of block 199 999:
12600527268990194816109317079654455295674413904799950143178505281837028536927

But in the division, there is a remainder:
http://www.wolframalpha.com/input/?i=87147097827283387491814940739178353533964145353273967578241214417087984945505448916205980486400+divided+by+12600527268990194816109317079654455295674413904799950143178505281837028536927

Thanks for help Wink
Since it's open source, if you believe that this is a better way to mine, you can go ahead and implement it. But keep in mind that when we hit dif 10 all 9 chains will become useless. So if I were you, I'd start producing 10 chains instead of 9 chains.
73  Bitcoin / Development & Technical Discussion / Re: difficulty calculation on: September 26, 2013, 03:35:54 PM
I thought it was inclusive?
74  Alternate cryptocurrencies / Service Announcements (Altcoins) / Re: Just-Dice.com : Play or Invest : 1% House Edge : Banter++ on: September 22, 2013, 01:44:44 AM
What's the profit at?
75  Alternate cryptocurrencies / Service Announcements (Altcoins) / Re: [ANN] mcxNOW.com : Deposit. Earn Interest. Trade. on: September 17, 2013, 01:29:55 PM



How the hell are you gonna tell me I can't have a space in my password?
76  Economy / Gambling / What makes a gambling site successful? on: September 14, 2013, 08:22:19 PM
In terms of features?
77  Other / Off-topic / Re: Futuristic project: upload your brain in a blockchain on: September 09, 2013, 01:50:53 PM
What incentive do people have to host this blockchain?
78  Bitcoin / Bitcoin Discussion / Why did we raise the Blocksize limit? on: September 08, 2013, 01:14:28 AM
Why was it raised from 256kb (12.79GB per year max) to the current 1MB block limit at 51GB per year?

Only 4010 blocks have been over 256kb so far... And blocks are usually under 200kb.
79  Bitcoin / Development & Technical Discussion / Re: x^3+7=0 ? on: September 04, 2013, 01:24:49 AM
It only becomes trivial to crack the equation when the same "random" number is used in subsequent transactions. Basically the same way they got into Sony's servers, it can, and has been executed on the Blockchain, a few months back some application was using the same random numbers in transactions and people were able to calculate the private key.
80  Alternate cryptocurrencies / Altcoin Discussion / Re: Why not stıck to bıtcoın? on: September 01, 2013, 10:01:18 PM
Just because it came first doesn't mean it is the best thing that can exist.

I personally feel that Bitcoin was never intended to survive, but merely start the creation of a better currency.
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