Re: [Bitcoin-development] Proposed alternatives to the 20MB step function
Tier Nolan tier.no...@gmail.com writes: On Sat, May 16, 2015 at 1:22 AM, Rusty Russell ru...@rustcorp.com.au wrote: 3) ... or maybe not, if any consumed UTXO was generated before the soft fork (reducing Tier's perverse incentive). The incentive problem can be fixed by excluding UTXOs from blocks before a certain count. UTXOs in blocks before 375000 don't count. OK. Be nice if these were cleaned up, but I guess it's a sunk cost. 4) How do we measure UTXO size? There are some constant-ish things in there (eg. txid as key, height, outnum, amount). Maybe just add 32 to scriptlen? They can be stored as a fixed digest. That can be any size, depending on security requirements. Gmaxwell's cost proposal is 3-4 bytes per UTXO change. It isn't 4*UXTO.size - 3*UTXO.size He said utxo_created_size not utxo_created so I assumed scriptlen? It is only a small nudge. With only 10% of the block space to play with it can't be massive. But you made that number up? The soft cap and hard byte limit are different beasts, so there's no need for soft cost cap hard byte limit. This requires that transactions include scriptPubKey information when broadcasting them. Brilliant! I completely missed that possibility... 5) Add a CHECKSIG cost. Naively, since we allow 20,000 CHECKSIGs and 1MB blocks, that implies a cost of 50 bytes per CHECKSIG (but counted correctly, unlike now). This last one implies that the initial cost limit would be 2M, but in practice probably somewhere in the middle. tx_cost = 50*num-CHECKSIG + tx_bytes + 4*utxo_created_size - 3*utxo_consumed_size A 250 byte transaction with 2 inputs and 2 outputs would have an adjusted size of 252 bytes. Now cost == 352. That is to large a cost for a 10% block change. It could be included in the block size hard fork though. I don't think so. Again, you're mixing units. I think have one combined cost for transactions is good. It means much fewer spread out transaction checks. The code for the cost formula would be in one place. Agreed! Unfortunately there'll always be 2, because we really do want a hard byte limit: it's total tx bytes which brings most concerns about centralization. But ideally it'll be so rarely hit that it can be ~ ignored (and certainly not optimized for). Cheers, Rusty. -- One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y ___ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
[Bitcoin-development] Open Bitcoin Privacy Project Spring 2015 Report
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 We're produced the first in what we hope to be a long series of reviews of Bitcoin wallet privacy features, available here: http://www.openbitcoinprivacyproject.org/2015/05/spring-2015-wallet-privacy-rating-report/ https://github.com/OpenBitcoinPrivacyProject/wallet-ratings/raw/master/2015-1/OBPP%20Bitcoin%20Wallet%20Privacy%20Rating%20Report%20-%20Spring%202015.pdf Specifically from the readers of this list, we are very interested in feedback regarding our privacy threat model and the rating criteria we derive from it. Threat model: https://github.com/OpenBitcoinPrivacyProject/wallet-ratings/blob/master/2015-1/threat%20model.wiki Please send any suggestions or corrections via a GitHub issue to the wallet-ratings repository so that we can incorporate it into future reports. - -- Justus Ranvier Open Bitcoin Privacy Project http://www.openbitcoinprivacyproject.org/ jus...@openbitcoinprivacyproject.org E7AD 8215 8497 3673 6D9E 61C4 2A5F DA70 EAD9 E623 -BEGIN PGP SIGNATURE- iQIcBAEBAgAGBQJVWhBvAAoJECpf2nDq2eYj3JEP/jw/Xkgq4yZRE4FK8a8kPBqn 3ULyS74KtNyPDdpTK0bdH7//0d1ep+LvNpIkFhWCJ/WQ7T/Ft3iQl1HJvXGC0ZzM XKd7ptXLpBrKElARAORgUlFPOeKzOrOyP4uvvGAMZ+CXEnKeyxDzK+WzfYnWyDEU Q4XQ/ndwPqbZm9Nb+GeF186TXcA/KqcQEuOIw7/jFGHfFT6QBKVz1SraVrgdcMky 8KKYOsYJt8lTUjVN1INmLFoRZ0cGUd+IFKweSCibyAu9TdvVQfQSPfSnfZtDLk6X g1oPYaxX6r9+/1zm2v5ISk97nKrvNslPjeQbuW3vWlROSxGZ9lV+MVNvkqm1jSpF ip0Il+VJb8hhh9LRJV6euhLQyR+xnLIVJvslJt883rhKIBi3M/OipMuhipIeAbnV 0WQmnpQ9ZgagPoFRxGp86Cz7PWTfj7zllB3yk/M3tA8e64VQFhEnoyJO8hPqfEQh wPZP3UQ+K3PM/2oe4W5ZkfkqD6tIzGTQeMkGFeCvTsMmsW9+Ml8j4YTwKA0z5vr5 IebJ51Vpaq1noVEl46q8utpLp1wATI8SG5sBwSaR4/REUGkSWjSCeZeLcK8WzdEa SaZ8t5Rqr1AcwtD6n9rVvYoF26285120jM/YX8XgMldWi0RXrlWD4B4lA1i7eVfZ hINSIR+QsJsw7yq7Ox3/ =NMNo -END PGP SIGNATURE- 0xEAD9E623.asc Description: application/pgp-keys -- One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y___ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
Re: [Bitcoin-development] Open Bitcoin Privacy Project Spring 2015 Report
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Replying to the list because this is a common question. We rated as many wallets as we could based on the amount of manpower we had available to perform the ratings. We will be holding a recruiting drive shortly to solicit additional volunteers so that we can cover more wallet for the next round of ratings. On 05/18/2015 11:40 PM, Eric Lombrozo wrote: mSIGNA is notably absent from the report despite having some of the most advanced security and privacy features and having been on the bitcoin.org site longer than some of the other wallets reviewed. Is there some process to get reviewed I missed? Please add us to the report. - -- Justus Ranvier Open Bitcoin Privacy Project http://www.openbitcoinprivacyproject.org/ jus...@openbitcoinprivacyproject.org E7AD 8215 8497 3673 6D9E 61C4 2A5F DA70 EAD9 E623 -BEGIN PGP SIGNATURE- iQIcBAEBAgAGBQJVWmA1AAoJECpf2nDq2eYjXGgP/2CpIYpG49WKAfG/PXmu1zFV +zzU/7PCz+0ez0mGCz5l3QMc9TCDs6KDx0sPHZngwwLio3C4JMpu+zfnw6gngw/G 6NNtmDZ9xWgWx3kQyBLWBCM/K63rLE1QYJqiIc7QaDuDTk5w0upwkFxLejWeem1j Z8Zy6ycHNNHE19o5pIYViWaRXojMD70fBFSoU9sAyvnOup7b5Cj4PLx7mbMbaegV gCHd7zd88AH0f2ilFiVMQJBKf03KzYjarRVrAyvAb/8VLiYMRC8SS3y2tzM+qRKl ZADAp8FiQ6GOFRssNg+x7tc3DX2ngBljLLKM90kPLR2cvwp8VHi0I0biqM8n2M17 CMjZVRNvXitNnKFc42nk51HsZR5LkDK3Rf9I1E3fBVKJ5feEbDi3tlEg9PCWD2xM PmSRzXoUBAjpr9xL2kBzlE4aTYZCmmMxAMF1mcSYujdNzQ2IN0gD1urJtCwZ8zZ1 LL2cPimS3GTWEpoQQ/Fu+0NDwiPditDGt+DN16Mi5uioPvaumHMIV6u9ZNdD9ZEv UTGW8C2Hj+ENzqhpdhlV5YfYUnKo6/ukw+xxTXRxbbLGxA6iRrVnPzsYTZoF0Vrt T4IsdzPIg5yeF5IQKEV1lLyx+gOIvmDF1RZE36NY8bGn2zusFzUGxiqWa6yw0hfw l4ytd8pfhIvTkuz1o9aQ =kWhU -END PGP SIGNATURE- 0xEAD9E623.asc Description: application/pgp-keys -- One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y___ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
