Re: [Bitcoin-development] Consensus-enforced transaction replacement via sequence numbers
Please remove me from the mailing list 2015-05-27 3:50 GMT+02:00 Mark Friedenbach m...@friedenbach.org: Sequence numbers appear to have been originally intended as a mechanism for transaction replacement within the context of multi-party transaction construction, e.g. a micropayment channel. The idea is that a participant can sign successive versions of a transaction, each time incrementing the sequence field by some amount. Relay nodes perform transaction replacement according to some policy rule making use of the sequence numbers, e.g. requiring sequence numbers in a replacement to be monotonically increasing. As it happens, this cannot be made safe in the bitcoin protocol as deployed today, as there is no enforcement of the rule that miners include the most recent transaction in their blocks. As such, any protocol relying on a transaction replacement policy can be defeated by miners choosing not to follow that policy, which they may even be incentivised to do so (if older transactions provide higher fee per byte, for example). Transaction replacement is presently disabled in Bitcoin Core. These shortcomings can be fixed in an elegant way by giving sequence numbers new consensus-enforced semantics as a relative lock-time: if a sequence number is non-final (MAX_INT), its bitwise inverse is interpreted as either a relative height or time delta which is added to the height or median time of the block containing the output being spent to form a per-input lock-time. The lock-time of each input constructed in this manor, plus the nLockTime of the transaction itself if any input is non-final must be satisfied for a transaction to be valid. For example, a transaction with an txin.nSequence set to 0xff9b [== ~(uint32_t)100] is prevented by consensus rule from being selected for inclusion in a block until the 100th block following the one including the parent transaction referenced by that input. In this way one may construct, for example, a bidirectional micropayment channel where each change of direction increments sequence numbers to make the transaction become valid prior to any of the previously exchanged transactions. This also enables the discussed relative-form of CHECKLOCKTIMEVERIFY to be implemented in the same way: by checking transaction data only and not requiring contextual information like the block height or timestamp. An example implementation of this concept, as a policy change to the mempool processing of Bitcoin Core is available on github: https://github.com/maaku/bitcoin/tree/sequencenumbers -- ___ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development -- ___ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development
[Bitcoin-development] Bitcoin transaction
Hello evry body, I want to know what is the difference between a bitcoin transaction and colored coins transaction technically. Thanks -- 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] Bitcoin transaction
Thank You, I know this, but I want to have mores details in the inputs/outputs, or in the script of input/output and how i will proceed in the code. Thanks for all replaying 2015-05-12 11:47 GMT+02:00 Patrick Mccorry (PGR) patrick.mcco...@newcastle.ac.uk: There is no difference to the transaction as far as im aware – just the inputs / outputs have a special meaning (and should have a special order). So you can track 1 BTC throughout the blockchain and this 1 BTC represents my asset. Someone may give a more useful answer. *From:* Telephone Lemien [mailto:lemienteleph...@gmail.com] *Sent:* 12 May 2015 10:45 *To:* Bitcoin Dev *Subject:* [Bitcoin-development] Bitcoin transaction Hello evry body, I want to know what is the difference between a bitcoin transaction and colored coins transaction technically. Thanks -- 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] Where do I start?
Hello, I'm a beginner in Bitcoin and I want to know, what are things those allo me to understand Bitcoin protocol and make progress in java to become a good developper. Please tell me how I can begin. Best regards 2015-04-30 10:08 GMT+02:00 Jorge Timón jti...@jtimon.cc: As Mike says it depends on your interests. But one thing that is almost always welcomed is improving the tests, and it is unlikely that it conflicts with other people's PRs (unless they're changing that part of the code and need to update those tests. Improving documentation is also good and you can do that while reading the code. Usually I just start cloning, compiling and changing things as I read, if I understand this correctly, this change should not break the tests, if I understand this, this other change should break the build, etc. But again, is up to you. On Apr 16, 2015 2:34 PM, Mike Hearn m...@plan99.net wrote: Hey Gabe, That's diving into the deep end for sure! :) What are some current things that are lacking in Bitcoin core? Or am I better off making something else for the ecosystem? That depends on your interests. Many of the highest priority tasks in Bitcoin Core are rather complicated, unfortunately, even for people with experience. You can consult the issue tracker to get a feel for it. Alternatively, there are lots of wallet apps out there and plenty of more straightforward projects on them. However they may have less of a research flavour. -- BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT Develop your own process in accordance with the BPMN 2 standard Learn Process modeling best practices with Bonita BPM through live exercises http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ source=Sourceforge_BPM_Camp_5_6_15utm_medium=emailutm_campaign=VA_SF ___ Bitcoin-development mailing list Bitcoin-development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bitcoin-development -- 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 -- 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
