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11021  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [ANN][XCN] Cryptonite | 1st mini-blockchain coin | M7 PoW | No Premine on: August 08, 2014, 12:36:01 AM
New gpu miner code released with 50% speed up. Unfortunately this is an arms race we can't really win. Anything I do Wolf will take to improve his miner. Best we can hope for is to make improvements he already has.

The way you "win" is by getting to parity (where neither can significantly beat the other) and there a level playing field so mining is maximally decentralized instead of concentrated with the one or two people with the best miners.

11022  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [BBR] Boolberry: Privacy and Security - Guaranteed[Bittrex/Poloniex]GPU Released on: August 07, 2014, 11:26:28 PM
We just need to wait for XMR dataset to exceed 4GB and all the 32bit windows users getting crashes. At the rate of blockchain growth, that is but a few months away.

32 bit windows has a 2gb user address space not 4gb and hasn't worked with xmr for months. Don't wait for this. Smiley
11023  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [ANN][XCN] Cryptonite | 1st mini-blockchain coin | M7 PoW | No Premine on: August 07, 2014, 10:16:05 PM
Yes, we need the optimisation desperately.  On average I am getting 1.2-1.3mh over a longer period of time (from initial 1.4mh) versus 3mh+ Wolf is getting (he has improved over 2.2mh and I am not sure if he is sharing his private miner to a few privileged).  That is less than half of the hash rate of what Wolf's private miner can do. This is by no mean a small amount!  With the current exchange rate of 0.000024, we are all losing a lot when mining with the public miner.

Why is this thread full of crying people? This is really pathetic! Yes, it is a significant difference in performance, but it is not devastating. You just mine 50% of what he does with the same HW, this is still fine. Instead of crying and waiting for everything served on a silver plate, you can:

1) dedicate your own time to learn CUDA programming, run NvProfiler and do your own optimizations, like Wolf0 did
2) pay someone to do optimizations for you
3) buy twice more HW you have now

+1

4) Organize fundraising to crowdfund releasing a faster miner. This is really a good fit since there is an objective way to measure it. "2x the speed on such and such hardware, you get X amount of coins."

Stop expecting people to do free work and hand you free money by helping you mine. It is pathetic and stupid.

I agree BTW that 50% is not atrocious. It is probably still quite profitable over the cost of electricity or compared to most other coins you could mine.

11024  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 10:02:01 PM
XCN is barely a week old, let's give it a couple of months before writing an obituary.   Cheesy  The high and long emission rate is there in part to prevent or at least regulate harmful bubbles; that's a feature, not a bug!   Cool

I never wrote an obituary, I said I would consider buying it! But only after the price goes down. Since I first said this, the price has gone down. A lot. It has more to go.




If I may ask, what do you see as a optimal buy-zone for XCN?

I think it is attractive at 1000-1500. That puts the eventual constant price market cap at about $10 million, or alternately in the millions over the next few years. That leaves room for upside as the gains awareness, recognition, and maturity. That is assuming everything goes right. I also think the coin is a good candidate for the first high profile catastrophic block chain corruption where nobody knows who owns what. That plus the risk it just goes nowhere means you want to see a lot of upside to invest.

I don't even think the price right now is terrible, just not attractive. I think it goes down more as miners continue to dump.
11025  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 09:44:32 PM
XCN is barely a week old, let's give it a couple of months before writing an obituary.   Cheesy  The high and long emission rate is there in part to prevent or at least regulate harmful bubbles; that's a feature, not a bug!   Cool

I never wrote an obituary, I said I would consider buying it! But only after the price goes down. Since I first said this, the price has gone down. A lot. It has more to go.


11026  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 09:12:11 PM
Given how much the market loves HypeCloneScamCoins like CLOAK, expecting a valuation in the "many millions" for a truly disruptive project like XCN is fairly reasonable.  At the very least, it should be in the Top 100!

You're missing the point. The price doesn't need to go up AT ALL for the market cap to reach into the millions and easily break the top 100, and even (in a few years at least) the top 10. The new coins will increase the market cap automatically.

The coin a week or so old. In 10 weeks it will have 10x the market cap with no change in the price at all. In two years it will have 100x the market cap, again with no change in price.

I'm not suggesting by the way the the price can't go up. I agree with you that there is potential for increased awareness, hype, maturity, etc. But it is very hard for a large bubble to develop from current prices given the high rate of new coins that needs to find a home every single minute.

I have said that when the price drops to what I consider to be a sustainable price given the constant emission, I will consider buying it, for largely the same reasons you state. It is actually fairly close now, certainly much closer than it was at 5k-10k satoshis when I first started saying this.

11027  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 09:04:27 PM
My point is ultimately if you spend the coin for some hard asset, e.g. land, car, electronic fiat (since paper is going away), then you are identified with some coins that you exchanged for the asset. That you mixed them with ring signatures or CoinJoin to hide the trail where they came from, doesn't stop the authorities from demanding you reveal your private keys to prove you have given them the trail as they may compel you to do.

This is false. Yes, you are personally identified once you buy the land, car, etc. This would be true even if you paid with magical pixie dust coins that are fully anonymous in every sense of the word. This identifies where the seller got the coins from.

However even if you are forced to reveal your private keys, this doesn't unmask where you got the coins from, at least not in the cryptonote design with ring signatures.

11028  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 08:50:14 PM
As for money, XCN's market cap is extremely tiny in proportion to the amount of innovation and blue-sky potential it bears.  XCN isn't even on any major non-Chinese exchanges yet.  Compared to other less-exotic coins' massive hype/market caps, obscure young XCN is nothing and I will accumulate as many as possible while the market cap is less than $100k.  A $65,000 market cap for XCN is a joke; nom nom nom cheap coins!!! 

Current market cap is irrelevant given the emission that won't significantly decrease for several years. If you think the current price (or even worse the price a few days ago) is sustainable then you are betting on a market cap in the relatively near term of many millions of dollars.
11029  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 08:38:55 PM
Hashes are 32 bytes each. Transactions average very roughly 500 bytes...

There are other optimizations possible within Bitcoin. For example, it isn't necessary to store input scripts once the transaction is "fully" confirmed...

You are apparently incorrectly assuming the MBC coin doesn't perform some optimization to store only the outputs address (over the long-term that exceeds the window of retention of full transaction history), and thus the relative overhead of the hashes in the tree (compared to the retained transaction size for only the outputs) is much more significant than your computation of "2.5".

No I wasn't assuming that, I was merely stating that I don't see huge (and certainly not super-linear) improvements beyond what is readily implementable in Bitcoin as the need to scale presses. As with SPV clients, for example. A few years ago they didn't exist, now they are common. Pruning will likely follow a similar trajectory if needed, though may not actually be needed due to other obstacles both technical and to economic scaling.

Quote
Bitcoin would have to fork to achieve similar levels of efficiency. Actually I am not even sure they could. The historical block hash would have to change in order to discard part of a transaction's data. I suppose there might be some clever way to finagle it. Why not just implement the MBC instead.

Because there is already an installed base of maybe a million or so users, an increasing number of merchants accepting it, reasonably high quality hardware and software wallets, and countless other reasons that a strong network effect not only already favors Bitcoin itself, but also favors approaches that break the fewest parts of that machine. A new technology with small advantages won't overcome that either within Bitcoin as a reimplementation or as a competitor replacing it. It will take very large advantages for that to happen.

The bigger issues I see with Bitcoin have nothing to do with scaling of storage and everything to do with centralization. Mini-blockchain itself does not solve that, although I woudln't rule out that it could possibly enable some complementary approach that might. Cryptonite certainly doesn't though, at this point.


11030  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 08:13:36 PM
The efficiency advantages of the mini-blockchain relative to Bitcoin with pruning are quite small, certainly not order of magnitude. Given this I seriously doubt a mini-blockchain can defeat Bitcoin without other advantages.

"Bitcoin with pruning" does not yet, and may not ever, exist in a politically viable form other than XCN/XCN-forks.

It's not fair or valid to compare a successfully researched/designed/launched coin like XCN with vaporware.

You are right, it probably isn't fair, but it is my opinion. Conversely you could say that it isn't fair to compare an unused coin with one that already has a lot of adoption.

Quote
The point of mini-blockchain is not to "defeat" Bitcoin.  They are complementary projects sharing different parts of a rapidly growing crypto-economic pie, not fighting to the death in some kind of 'Two Coins Enter One Coin Leaves' zero-sum Thunderdome.

That requires that the indeed effective address different parts of the economic pie, and that each do so in a sufficiently better way a to overcome the natural network effect advantages of one coin instead of two.

Quote
Look at the trade-offs as a variant of Zooko's triangle.  You can have your cryptocoin be established/secure (BTC), anonymous/private (XMR), or scalable/instant (XCN).  All three of these niches need to be filled by distinctly specialized technology, until we can square the triangle...

That would be all well and good if I believed that Bitcoin wasn't as scalable as XCN, but I don't.

I do agree that other features of XCN may be more valuable, but their value at this point is quite speculative.

I still consider it overvalued, but getting closer to speculatively attractive.
11031  Alternate cryptocurrencies / Altcoin Discussion / Re: [XMR] Monero Community FAQ on: August 07, 2014, 11:23:39 AM
Hi Smiley I have question, if someone would be kind enough to answer Smiley

Is it possible to have totally open transactions with XMR (as open as BTC)....or do all transactions necessarily get obscured by ring-sig?

This was answered in this FAQ here: https://bitcointalk.org/index.php?topic=721045.msg8148948#msg8148948

It might have not been clear. This isn't something that's even similar to you comparing your transaction records with someone. This method involves using data that is constant in your wallet, the view-key, that you can use to reveal, with absolute proof, that your transaction occurred on the blockchain. With this, yes, totally open transactions are possible. They can be as open as BTC, if everyone were to share every single view-key that they use with every wallet they use and make them accessible to everyone. I don't know why people would do that though.
Well I was reading about black and white bitcoins today, and the possibility that regulators may try to identify addresses. Now if that were to happen, it may happen in some places but not others. It may happen for a while and then be abandoned. We don't know. But, in some places it may be useful to be a coin that is not necessarily "private", but has the option for more a more open ledger.

This is an interesting discussion, but not really fitting with a FAQ format at this point, right?
11032  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [BCN] Bytecoin (CPU-mining, true anonymity) on: August 07, 2014, 11:22:34 AM
The fact the they chose twitter as the main platform for news may seem weird, but i accept it. Guess now  i have to get an account there.

You don't need an account to read twitter.
11033  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 11:06:28 AM
Edit: I think I remember the issue was that because we can't guarantee that users won't reuse addresses, then pruned Bitcoin block chain can lead to double-spends if different clients have different rules on pruning, thus I think there is some fork needed to deal with this. But again I forget the details.

Edit#2: I haven't studied Cryptonite's implementation of the MBC, but if they didn't deal with the address reuse issue, that is a double-spend hole.

Cryptonite keeps a full block chain for, I believe, two weeks, after which it assumed that chain forks are never going to happen. Bitcoin pruning would need to do something similar

I might be wrong about the details though. I didn't really study Cryptonite very much after concluding that it adds little to Bitcoin with SPV and pruning, and also after seeing it grossly overvalued relative to its maturity. When the price comes down to something I might consider potentially attractive as an investment I might take a closer look.

11034  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 10:54:11 AM
The efficiency advantages of the mini-blockchain relative to Bitcoin with pruning are quite small, certainly not order of magnitude.

That seems to be incorrect on quick thought. Have I missed something?


Yes, merkle tree hashes are small and not that many are needed.

One hash is required for each complete branch that has been pruned (the extreme being the entire tree being pruned, in which case only the root hash in the header remains). The worst case would be one remaining transaction in a block with a long chain of hashes all the way from the transaction to the root. If there is more than one transaction, then fewer hashes are needed per transaction (the extreme case here being all the transactions present, in which case again only the root hash remains).

Hashes are 32 bytes each. Transactions average very roughly 500 bytes. The block header is 80 bytes. With 8 million transactions per block (obviously impossible with the current 1 MB block size, but let's assume that gets increased, and Visa scale is, somehow, reached), the tree is only 23-deep, so this is 736 bytes of hashes and 80 bytes of header for each unspent output, roughly a factor of 2.5x in total chain overhead. This is the worst case, which won't be reached for every block (some older blocks may be fully spent or expired by demurrage fees, and newer blocks will have more unspent outputs).

There are other optimizations possible within Bitcoin. For example, it isn't necessary to store input scripts once the transaction is "fully" confirmed. These likely require a fork but they don't certainly don't require a whole new coin, nor does switching to a new coin really offer any advantage if this sort of optimization (which is effectively what the mini-blockchain is doing) is seen as a valid tradeoff against security.





11035  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 10:16:57 AM
1. The pruning in Bitcoin is technically doable (and Satoshi very vaguely mentioned it in the seminal whitepaper), not likely as efficient as the MBC, but I wonder if the pools will even allow it to happen. They may have an incentive to make it more difficult to run a full client. We debated upthread whether users can solely dictate hard forks, or whether mining inertia is also in control of that decision. (so I won't rehash that discussion)

There is no fork.

Since pruning does not change the block hash, anyone can just go ahead and unilaterally prune blocks and either store them locally or serve them up to other nodes that request them. The blocks still form a valid chain, and although changes to node logic are obviously needed, permission from pools is not.

A node that receives pruned blocks can still verify transactions and mine on top of a pruned chain. Blocks mined this way are indistinguishable from blocks mined on top of an unpruned chain, so pools can't discriminate against these blocks. Of course concentrated pools can shut out anyone not part of their cartel, but that is independent of pruning.

The efficiency advantages of the mini-blockchain relative to Bitcoin with pruning are quite small, certainly not order of magnitude. Given this I seriously doubt a mini-blockchain can defeat Bitcoin without other advantages.
11036  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 05:09:13 AM
On the surface less efficient if addresses are reused (which is often not recommended), but not dramatically so. Both end up with block headers plus UTXO.

Perhaps there are also issues around efficiency of how the history is stored with multiple Merkle trees (one per block) verses one Account Tree. Again not major, probably a constant factor.

Yes if there are straggler unspent transactions in old blocks then there will be some merkle branch hashes that need to be kept. Once all the transactions in an old block are spent that goes away and all you have is the header, which is exactly the same as MBC.

This may seem implausible if there are many transactions per block. Except that to keep the ledger from filling with dust and abandoned outputs, MBC suggests (though Cryptonite does not yet implement) some per-account demurrage (idle balances eventually decay to zero and can be pruned). If you do the same thing in bitcoin then you can clean up the old blocks as well. In the end they seem comparable.

11037  Alternate cryptocurrencies / Altcoin Discussion / Re: rpietila Altcoin Observer on: August 07, 2014, 04:52:45 AM
Pruning of the blockchain is apparently technically plausible for Bitcoin and some apparently effort has been applied investigating that. Will probably be less efficient than the mini blockchain.

It is more than plausible, it is explained in the original paper. On the surface less efficient if addresses are reused (which is often not recommended), but not dramatically so. Both end up with block headers plus UTXO.

Cryptonite has some other nice features though. The 10 year reward halving schedule is unusual, perhaps valuable, and will never be adopted by Bitcoin. At least it pushes very-low-reward issues out several decades.
11038  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [ANN][XCN] Cryptonite | 1st mini-blockchain coin | M7 PoW | No Premine on: August 07, 2014, 04:30:00 AM

You really should tag that stuff NSFW specially on threads where people don't know.
11039  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [BCN] Bytecoin (CPU-mining, true anonymity) on: August 07, 2014, 02:49:30 AM
Interesting discussion over on the technical thread.

I have 2 questions.

Why was this question deleted: "How come your cpu miner was ridiculously slow for so long?"

Why are you so fucking shady.

Mirror with deleted posts: https://bitcointa.lk/threads/bcn-bytecoin-technical-discussion.348248/#post-7821718

The question was deleted as off topic. This thread is for technical discussions only. Main focus should be on core technology questions.

I disagree with your opinion about the question being off topic: Maybe we have a different definition of "technical", but this is a question regarding actual code, which has/had a big effect on the distribution of BCN besides the unknown situation of "2 years" of being "underground"
11040  Alternate cryptocurrencies / Altcoin Discussion / Re: [XMR] rpietila Monero Economics thread on: August 06, 2014, 09:52:30 PM
It attempts to measure price versus breakeven mining sell price in XMR/BTC. According to this, XMR is cheap right now.

It would be helpful to state your assumptions (GPU cost, power cost, etc.)
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