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Bitcoin block propagation - Ultra compression

This solution paper is a sequel to my earlier post on reddit Bitcoin-SV: are terabyte blocks feasible?, I recommend reading that article first as it deals with requirements scoping & feasibility before continuing this paper.

Would greatly appreciate feedback and criticism on the above from SV devs. I recently noticed a tweet from @shadders333where he announced a potential solution for block propagation will be announced in the CoinGeek scaling conference. It is purely co-incidental I was interested in this problem for the past few days, and I have no clue about the solution they intend to share. Would love to hear first-hand thoughts from you guys.
Edit: Added a new section to the paper on how it compares with Graphene. Copying the same here as well. 

Comparison with Graphene:

Graphene uses techniques such as Bloom filters and invertible bloom lookup tables (IBLTs) to compress blocks with better efficiency when compared to Compact Blocks (BIP-152). Graphene works on a probabilistic model for IBLT decoding, and there is a small chance of failure, in that event the sender must resend the IBLT with double the number of cells, the authors did some empirical testing and found this doubling was sufficient for the very few that actually failed. It seems the Graphene sizes are linearly proportional to the mempool sizes. But practically speaking, we need to take another factor "mempool divergence" into account, as network grows and mempools become larger the divergence increases, and in practice decoding failures will raise. One proposal to counter this is to request blocks from multiple (2/3) peers and merging them together, this decreases the probability of IBLT decoding errors at the cost of additional resources. There is also an open attack vector called the poison block attack where a malicious miner could mine a block with transactions that are held private, this will lead to a inevitable decode failure. Although this attack seems fatal to Graphene’s adoption, there is likely hope that game theoretical PoW underpinnings may come to the rescue.
Graphene distills the block propagation problem into the classical set reconciliation problem (Set theory; order of elements is irrelevant), it builds on the previous academic literature on Set reconciliation which also involved Bloom filters & IBLTs. It discards the concomitant time information of transactions and defaults to implicit ordering, typically canonical (ID sorting). But it supports supplemental order information to be included. If topological ordering of transactions is needed, additional ordering information has to be included at the cost of increasing the size of the block. It complements well with implicit ordering techniques like CTOR(Canonical Transaction ordering), although it deviates from Nakamoto style chronological ordering of transactions within a block.
Whereas Ultra compression (this paper) has a novel approach which leverages the concomitant time information of transactions to its advantage and achieves a much better compression factor. It does not approach the problem as merely that of Set reconciliation and instead by improves efficiency by encoding relative time sequence of transactions into a block.
The primary advantages are as below:
Notable disadvantages:
In my subsequent post, I will cover a more comprehensive distributed system architecture for a Node that covers the following:
submitted by stoichammer to bitcoinsv [link] [comments]

"Vigorous debate" over Shamir/Ron's supposedly DPR-linked "Founder" ends in minutes

Their first paper didn't get great reviews and they don't seem to have taken any of the feedback on board before this second sensationalist paper. Within hours of the paper coming out, it turns out that the identity of the owner of their mysterious "founder" address containing 77624 BTC could have easily been found via the first page of a Google search leading to a widely used Bitcoin reputation/trading database and a quick PGP key lookup --- or, y'know, just asking someone in the community with half a clue.
Anyone beginning to wonder why "This research was supported by a research grant provided by the Citi Foundation"?
The actual owner of the address in question has provided his own rebuttal. Someone who has done previous forensic work on identifying Satoshi's mined coins also finds the link unlikely.
I didn't discover this, by the way; I just feel it deserves airtime.
The quotation in the title is from this paragraph in the paper:
The short path we found (which is depicted in Figure 6) suggests (but does not prove) the existence of a surprising link between the two mysterious figures of the Bitcoin community, Satoshi Nakamoto and DPR. It is reasonable to assume that all the accounts described along the top of Figure 6 belong to the same person, but to be on the safe side we refer to him as a “Founder” rather than as Satoshi Nakamoto. We are sure that analyzing this figure will start a very vigorous debate in the Bitcoin community.
Edits: linkify 77624 BTC address; linkify second paper PDF; give full quotation referred to by the topic; change "the OTC database" to "a widely used Bitcoin reputation/trading database"; add drudian's own rebuttal, link to Lerner's work.
submitted by iwilcox to Bitcoin [link] [comments]

Rethinking Large-Scale Consensus

Cryptology ePrint Archive: Report 2018/302
Date: 2018-03-29
Author(s): Rafael Pass, Elaine Shi

Link to Paper

In this position paper, we initiate a systematic treatment of reaching consensus in a permissionless network. We prove several simple but hopefully insightful lower bounds that demonstrate exactly why reaching consensus in a permissionless setting is fundamentally more difficult than the classical, permissioned setting. We then present a simplified proof of Nakamoto's blockchain which we recommend for pedagogical purposes. Finally, we survey recent results including how to avoid well-known painpoints in permissionless consensus, and how to apply core ideas behind blockchains to solve consensus in the classical, permissioned setting and meanwhile achieve new properties that are not attained by classical approaches.

[2] Lightning network.
[3] Marcin Andrychowicz and Stefan Dziembowski. Pow-based distributed cryptography with no trusted setup. In CRYPTO, pages 379–399, 2015.
[4] Hagit Attiya, Cynthia Dwork, Nancy Lynch, and Larry Stockmeyer. Bounds on the time to reach agreement in the presence of timing uncertainty. J. ACM, 41(1):122–152, 1994.
[5] Simon Barber, Xavier Boyen, Elaine Shi, and Ersin Uzun. Bitter to betterhow to make bitcoin a better currency. In Financial cryptography and data security, pages 399–414. Springer, 2012.
[6] Iddo Bentov and Ranjit Kumaresan. How to Use Bitcoin to Design Fair Protocols. In CRYPTO, 2014.
[7] Miguel Castro and Barbara Liskov. Practical byzantine fault tolerance. In OSDI, 1999.
[8] T-H. Hubert Chan, Naomi Ephraim, Antonio Marcedone, Andrew Morgan, Rafael Pass, and Elaine Shi. Blockchain with varying number of players. Manuscript, 2017.
[9] Jing Chen and Silvio Micali. Algorand: The efficient and democratic ledger., 2016.
[10] Sophia Yakoubov Conner Fromknecht, Dragos Velicanu. A decentralized public key infrastructure with identity retention. Cryptology ePrint Archive, Report 2014/803, 2014.
[11] Kyle Croman, Christian Decker, Ittay Eyal, Adem Efe Gencer, Ari Juels, Ahmed Kosba, Andrew Miller, Prateek Saxena, Elaine Shi, Emin Gun Sirer, Dawn Song, and Roger Wattenhofer. On scaling decentralized blockchains (a position paper). In Bitcoin Workshop, 2016.
[12] Phil Daian, Rafael Pass, and Elaine Shi. Snow white: Robustly reconfigurable consensus and applications to provably secure proofs of stake. Cryptology ePrint Archive, Report 2016/919, 2016.
[13] Danny Dolev and H. Raymond Strong. Authenticated algorithms for byzantine agreement. Siam Journal on Computing - SIAMCOMP, 12(4):656–666, 1983.
[14] Cynthia Dwork, Nancy Lynch, and Larry Stockmeyer. Consensus in the presence of partial synchrony. J. ACM, 1988.
[15] Cynthia Dwork and Moni Naor. Pricing via processing or combatting junk mail. In CRYPTO, 1992.
[16] Ittay Eyal and Emin Gun Sirer. Majority is not enough: Bitcoin mining is vulnerable. In FC, 2014.
[17] Michael J. Fischer, Nancy A. Lynch, and Michael Merritt. Easy impossibility proofs for distributed consensus problems. In PODC, 1985.
[18] Juan A. Garay, Aggelos Kiayias, and Nikos Leonardos. The bitcoin backbone protocol with chains of variable difficulty. Cryptology ePrint Archive, 2016/1048.
[19] Juan A. Garay, Aggelos Kiayias, and Nikos Leonardos. The bitcoin backbone protocol: Analysis and applications. In Eurocrypt, 2015.
[20] Jonathan Katz, Andrew Miller, and Elaine Shi. Pseudonymous secure computation from timelock puzzles. IACR Cryptology ePrint Archive, 2014:857, 2014.
[21] Aggelos Kiayias, Alexander Russell, Bernardo David, and Roman Oliynykov. Ouroboros: A provably secure proof-of-stake blockchain protocol. In Crypto, 2017.
[22] Leslie Lamport. The weak byzantine generals problem. J. ACM, 30(3):668–676, 1983.
[23] Leslie Lamport. Fast paxos. Distributed Computing, 19(2):79–103, 2006.
[24] Litecoin - Open source P2P digital currency.
[25] Andreas Loibl. Namecoin., 2014.
[26] Satoshi Nakamoto. Bitcoin: A peer-to-peer electronic cash system. 2008.
[27] Rafael Pass and abhi shelat. Micropayments for peer-to-peer currencies. In ACM CCS, 2015.
[28] Rafael Pass, Lior Seeman, and Abhi Shelat. Analysis of the blockchain protocol in asynchronous networks. In Eurocrypt, 2017.
[29] Rafael Pass and Elaine Shi. Fruitchains: A fair blockchain. In PODC, 2017.
[30] Rafael Pass and Elaine Shi. Hybrid consensus: Efficient consensus in the permissionless model. In DISC, 2017.
[31] Rafael Pass and Elaine Shi. The sleepy model of consensus. In Asiacrypt, 2017.
[32] Rafael Pass and Elaine Shi. Thunderella: Blockchains with optimistic instant confirmation. In Eurocrypt, 2018.
[33] Sylvia Ratnasamy, Paul Francis, Mark Handley, Richard Karp, and Scott Shenker. A scalable content-addressable network. SIGCOMM Comput. Commun. Rev., 31(4):161–172, August 2001.
[34] Antony Rowstron and Peter Druschel. Pastry: Scalable, decentralized object location, and routing for large-scale peer-to-peer systems. In Middleware, pages 329–350, 2001.
[35] Yonatan Sompolinsky and Aviv Zohar. Secure high-rate transaction processing in bitcoin. In Financial Cryptography, 2015.
[36] Ion Stoica, Robert Morris, David Karger, M. Frans Kaashoek, and Hari Balakrishnan. Chord: A Scalable Peer-to-peer Lookup Service for Internet Applications. In SIGCOMM, 2001.
[37] Gavin Wood. Ethereum: A secure decentralized transaction ledger., 2014.
submitted by dj-gutz to myrXiv [link] [comments]

Why is Vistomail coming back? What it is about this provider? Did I miss something about Michael Weber?

One of the "proofs" about Wright's supposed secret identity is his email account which resembles one of Satoshi's known account. So I asked myself, and now you, what is it with this "provider"?
I looked into it and found this portal not accessible from either the main domain or www subdomain (but found on google with a simple Interestingly enough they seem to sell VPN, not mail addresses.
I tried creating an account and there is a free 1 day trial period which I won't use for reasons I'll detail here (among other questions):
Sorry for the long post and broken english. Also I'm not Satoshi (if we all exclude ourselves one by one it's going to be easier for newsweak to find who really is).
submitted by paulds_fr to Bitcoin [link] [comments]

How To Find Private Key of Imported Blockchain Address Who Is Satoshi Nakamoto? Bitcoin Dumps 7% After 50 BTC Transaction  Ethereum Dangerous To Own? Satoshi Nakamoto Moving Bitcoin?  Shopify Integrates Crypto Payments! Satoshi Nakamoto Releases Excerpts From Book Who Is The Bitcoin Founder Satoshi Nakamoto

Does anyone know Satoshi Nakamoto's bitcoin address to verify how much is there? 2 comments. share. save hide report. 44% Upvoted. This thread is archived . New comments cannot be posted and votes cannot be cast. Sort by. best. View discussions in 1 other community. level 1. 5 points · 4 years ago. There's no single address, just the coinbase reward for most of the early mined blocks. Exactly ... Nakamoto removed replacement from Bitcoin version 0.3.12, leaving only the comment, ... To address those concerns, a variation on RBF was created that required that the replacement transaction pay all of same outputs as the original transaction in equal or greater amount. This was called RBF First Seen Safe (RBF-FSS), and the original RBF became known as full-RBF. Although agreeable to ... Check Bitcoin addresses, lookup transactions & monitor wallet balances with our block explorer & BTC address finder. No signup required, free to use! Lookup your bitcoin address / wallet Bitcoin Invoice + Search Search tips: Multiple addresses can be searched at once by seperating with whitespace; Xpub can be searched to get complete wallet balance; To create invoice search your receiving ... Satoshi Nakamoto Bitcoin Address - Bitcoin Cash Circle Satoshi Nakamoto Bitcoin Address Bitcoin Fund Investment Bitcoin Copper Round With the rapid rise in the number of bitcoin scams, there are easy ways to check if a bitcoin address has been reported as being used by scammers, such as in fake bitcoin giveaways. You can also ...

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How To Find Private Key of Imported Blockchain Address

00:53 Market Update 01:25 ETH vs Lightning Network 03:05 Ethereum Addresses Surge (40 million) 04:36 USDT 3rd place market cap 05:41 Did Satoshi Nakomoto Cre... Is Satoshi Nakamoto moving some of his Bitcoin? An early 2009 Bitcoin address started moving 50 BTC. Is it Satoshi, or is it not? Also, Shopify, the biggest e-commerce platform in the world, adds ... It's very interesting to me that - as far as I am aware - Nakamoto only sent bitcoins once, to Hal Finney. That's paranoia for you. That's paranoia for you. The Bitcoin address system, on the ... The leading crypto’s drop coincided with news that one of the first few thousand Bitcoin addresses just made its first transaction. The address involved is from February 2009 — and the 50 ... Nothing is known about the mysterious Founder of Bitcoin, and the last communication Satoshi Nakamoto had with the world was in two thousand eleven. Since then, there have been many theories about ...