CryptoNote - Blockchain Projekt - BitcoinWiki

An Analysis of Attacks on Blockchain Consensus

Date: 2016-11-20
Author(s): George Bissias, Brian Neil Levine, A. Pinar Ozisik, Gavin Andresen

Link to Paper

We present and validate a novel mathematical model of the blockchain mining process and use it to conduct an economic evaluation of the double-spend attack, which is fundamental to all blockchain systems. Our analysis focuses on the value of transactions that can be secured under a conventional double-spend attack, both with and without a concurrent eclipse attack. Our model quantifies the importance of several factors that determine the attack's success, including confirmation depth, attacker mining power, and any confirmation deadline set by the merchant. In general, the security of a transaction against a double-spend attack increases roughly logarithmically with the depth of the block, made easier by the increasing sum of coin turned-over (between individuals) in the blocks, but more difficult by the increasing proof of work required. In recent blockchain data, we observed a median block turnover value of 6 BTC. Based on this value, a merchant requiring a single confirmation is protected against only attackers that can increase the current mining power by 1% or less. However, similar analysis shows that a merchant that requires a much longer 72 confirmations (~12 hours) will eliminate all potential profit for any double-spend attacker adding mining power less than 40% of the current mining power.

  1. Back, A., Corallo, M., Dashjr, L., Mark, F., Maxwell, G., Miller, A., Poelstra, A., Timón, J., Wuille, P.: Enabling Blockchain Innovations with Pegged Sidechains. (October 2014)
  2. Bissias, G., Ozisik, A.P., Levine, B.N., Liberatore, M.: Sybil-Resistant Mixing for Bitcoin. In: Proc. ACM Workshop on Privacy in the Electronic Society (November 2014),
  3. Confirmation. (February 2015)
  4. Bonneau, J., Miller, A., Clark, J., Narayanan, A., Kroll, J., Felten, E.: Sok: Research perspectives and challenges for bitcoin and cryptocurrencies. In: IEEE S&P. pp. 104–121 (May 2015),
  5. Bonneau, J.: How long does it take for a bitcoin transaction to be confirmed? (November 2015)
  6. Croman, K., et al.: On Scaling Decentralized Blockchains . In: Workshop on Bitcoin and Blockchain Research (Feb 2016)
  7. Douceur, J.: The Sybil Attack. In: Proc. Intl Wkshp on Peer-to-Peer Systems (IPTPS) (Mar 2002)
  8. Ethereum Homestead Documentation.
  9. Eyal, I., Sirer, E.G.: Majority Is Not Enough: Bitcoin Mining Is Vulnerable. Financial Cryptography pp. 436–454 (2014),
  10. Fischer, M., Lynch, N., Paterson, M.: Impossibility of distributed consensus with one faulty process. JACM 32(2), 374–382 (1985)
  11. Gervais, A., O. Karame, G., Wust, K., Glykantzis, V., Ritzdorf, H., Capkun, S.: On the Security and Performance of Proof of Work Blockchains. (2016)
  12. Heilman, E., Alshenibr, L., Baldimtsi, F., Scafuro, A., Goldberg, S.: Tumblebit: An untrusted bitcoin-compatible anonymous payment hub. Cryptology ePrint Archive, Report 2016/575 (2016),
  13. Heilman, E., Kendler, A., Zohar, A., Goldberg, S.: Eclipse Attacks on Bitcoin’s Peer-to-peer Network. In: USENIX Security (2015)
  14. Litecoin.
  15. Meiklejohn, S., Pomarole, M., Jordan, G., Levchenko, K., McCoy, D., Voelker, G., Savage, S.: A Fistful of Bitcoins: Characterizing Payments Among Men with No Names. In: Proc. ACM IMC. pp. 127–140 (2013),
  16. Nakamoto, S.: Bitcoin: A Peer-to-Peer Electronic Cash System. (May 2009)
  17. Pagnia, H., Vogt, H., Gaertner, F.: Fair Exchange. The Computer Journal, vol. 46, num. 1, p. 55, 2003. 46(1), 55–78 (2003)
  18. Poon, J., Dryja, T.: The Bitcoin Lightning Network: Scalable Off-Chain Instant Payments. (November 2015)
  19. Ron, D., Shamir, A.: Quantitative analysis of the full bitcoin transaction graph. In: Proc. Financial Crypto. pp. 6–24 (Apr 2013),
  20. Rosenfeld, M.: Analysis of hashrate-based double-spending. (December 2012)
  21. Sapirshtein, A., Sompolinsky, Y., Zohar, A.: Optimal Selfish Mining Strategies in Bitcoin. (July 2015)
  22. Sasson, E.B., Chiesa, A., Garman, C., Green, M., Miers, I., Tromer, E., Virza, M.: Zerocash: Decentralized anonymous payments from bitcoin. In: IEEE S&P. pp. 459–474 (2014),
  23. Sompolinsky, Y., Zohar, A.: Secure high-rate transaction processing in Bitcoin. Financial Cryptography and Data Security (2015),
  24. Sompolinsky, Y., Zohar, A.: Bitcoin’s Security Model Revisited. (May 2016)
  25. Tschorsch, F., Scheuermann, B.: Bitcoin and beyond: A technical survey on decentralized digital currencies. IEEE Communications Surveys Tutorials PP(99), 1–1 (2016)
submitted by dj-gutz to myrXiv [link] [comments]

Why do I believe it was BCN destiny to be born in 2012?

Why do I believe it was BCN destiny to be born in 2012? Just look at this and see yourself:
1983 - Blind signatures were invented by David Chaum link 1997 - HashCash (proof of work system) was invented by Adam Back link
2001 - Ring signatures were invented by Ron Rivest, Adi Shamir, and Yael Tauman link
2003 - Mart n Abadi, Michael Burrows, and Ted Wobber presented "Moderately hard, memory-bound functions"link
2004 - Patrick P. Tsang and Victor K. Wei presented their paper "Short linkable ring signatures for e-voting, e-cash and attestation" link
2005 - Matthew Franklin and Haibin Zhang with "Unique Group Signatures" study link
2005 - Exponential memory-bound functions for proof of work protocols by Fabien Coelho link +2006 - "Traceable Ring Signature" by Fujisaki and Suzuki link
2008 - Bitcoin whitepaper by Satoshi Nakamoto link
2009 - Stronger key derivation via sequential memory-hard functions by Colin Percival link
2009 - First Bitcoin block was generated
2010 -2012 - Bitcoin Anonymity Problem Discussions link
2011 - An Analysis of Anonymity in the Bitcoin System, Fergal Reid and Martin Harrigwere link
5/15/2012 - Dorit Ron and Adi Shamir made Quantitative Analysis of the Full Bitcoin Transaction Graph link
6/8/2012 - Bytecoin Wiki started link
6/30/2012 - Bytecoin launch announcement link- first news
7/4/2012 - First BCN block was generated link
8/6/2012 - Destination Address Anonymization in Bitcoin (one-time addresses in BCN) link
10/19/2012 - Evaluating User Privacy in Bitcoin by Elli Androulaki, Ghassan O. Karame, Marc Roeschlin, Tobias Scherer, Srdjan Capkun. link
12/12/2012 -CryptoNote whitepaper v 1.0 link
12/13/2012 - Analysis of hashrate-based double-spending, Meni Rosenfeld link
10/17/2013 - CryptoNote whitepaper v 2.0 link
Here we see how the technology logically came to the advent of cryptocurrencies with ring signature and memory-bound function PoW implementation. Soon after Bitcoin's release the community started to raise concerns about its anonymity with multiple solutions and propositions. High concentration of theoretical papers on these topics in 2009-2011 most probably spurred the brightest minds to make attempts of practical e-cash with ring signatures realization. Therefore, BCN couldn't but appear in 2012.
Based on
submitted by joethejudge77 to BytecoinBCN [link] [comments]

Crypto Evangelist: Bitcoin - Like Every Asset - Is A Confidence Game  CNBC What is Shamir Backup? Bitcoin: Die Kunst des Tradens Bitcoin Looks REALLY Healthy - Here's What You MISSED! Bitcoin Playground  Upgrading Trezor Firmware to Bitcoin Only

From Bitcoin Wiki. Jump to: navigation, search. In new fields the normal systems of academic peer review may be ineffective because the norms for studying that field are not yet established, the basics are not yet widely known, and the best references sources have not been identified. The experience in the subject that the authors have relative to reviewers can be much greater than usual ... These allegations were contested and Ron and Shamir later retracted their claim. Nakamoto’s involvement with bitcoin does not appear to extend past mid-2010. In April 2011, Nakamoto communicated with a bitcoin contributor, saying that he had “moved on to other things”. 2001 - Ron Rivest, Adi Shamir und Yael Tauman haben der kryptographischen Gemeinschaft Ringunterschriften vorgeschlagen. 2004 - Patrick P. Tsang und Victor K. haben vorgeschlagen, das Ringsignatursystem für Abstimmungen und elektronisches Bargeld einzusetzen; 2008 - Bitcoin-Whitepaper von Satoshi Nakamoto; 2011 - Eine Analyse der Anonymität im Bitcoin-System, Fergal Reid und Martin Harrigan ... Bytecoin (BCN) ist die erste CryptoNote-basierte Kryptowährung, die im Juli 2012 eingeführt wurde.CryptoNote Technologie bietet absolute Anonymität für Bytecoin mit Ring-Signaturen und einmaligen Adressen. Diese Art von anonymen Transaktionen macht es nahezu unmöglich, die Absender- / Empfängeradresse herauszufinden. Gegenwärtig sind die Entwickler von Bytecoin am aktivsten, so dass ... Bitcoin. Bitcoin ist die weltweit führende Kryptowährung auf Basis eines dezentral organisierten Buchungssystems. Zahlungen werden kryptographisch legitimiert und über ein Netz gleichberechtigter Rechner (peer-to-peer) abgewickelt.Anders als im klassischen Banksystem üblich, ist kein zentrales Clearing der Geldbewegungen notwendig. Eigentumsnachweise an Bitcoin werden in persönlichen ...

[index] [46732] [26748] [23704] [50532] [25204] [15248] [46753] [38181] [8104] [17406]

Crypto Evangelist: Bitcoin - Like Every Asset - Is A Confidence Game CNBC

How to create a wallet using Shamir Backup: In this video we will show you how to create a new wallet using the Shamir Backup feature on the Trezor Model T hardware wallet. To learn more about ... This market trading analysis applies to various exchanges, including Bitmex and Binance. Tackling questions like if Bitcoin can reach 20k again and if we wil... Discussing the rally in bitcoin and what investors really need to know about the cryptocurrency space with Lou Kerner, Flight Ventures partner. » Subscribe t... What is Shamir Backup? How is it different from the original recovery seed? And why should you use it? All of this and a bit more in our short video explaining this revolutionary new way of ... Bitcoin Educational Resources Bitcoin Wiki : https: //en ... How to create a wallet using Shamir Backup - Duration: 1:45. Trezor 678 views. 1:45. Bitcoin Playground Bitrefill - Duration: 1:46 ...