Sunday, February 4, 2018

Purely P2P Crypto-Currency With Finite Mini-Blockchain

Download here : https://drive.google.com/open?id=1BrRWA1VX0hPepUGcuVSYsd6LDTTyhmI9

Source : https://pdfs.semanticscholar.org/3f64/123ce97a0079f8bea66d3f760dbb3e6b40d5.pdf

Abstract 

Almost all P2P crypto-currencies prevent double spending and similar such attacks with a bulky “blockchain” scheme, and the ones which do not typically use some sort of pseudo-centralized solution to manage the transactions. Here I propose a purely P2P crypto-currency scheme with a finite blockchain, dubbed the “mini-blockchain”. Each time a new block is solved the oldest block is trimmed from the end of the mini- blockchain so that it always has the same number of blocks. It is argued that the loss of security this trimming process incurs can be solved with a small “proof chain” and the loss of coin ownership data is solved with a database which holds the balance of all non-empty addresses, dubbed the “account tree”. The proof chain secures the mini- blockchain and the mini-blockchain secures the account tree. This paper will describe the way in which these three mechanisms can work together to form a system which provides a high level of integrity and security, yet is much slimmer than all other purely P2P currencies. It also offers other potential benefits such as faster transactions and lower fees, quicker network synchronization, support for high levels of traffic, more block space for custom messages, and increased anonymity.

J.D. Bruce
May 2013. Rev 1.
www.bitfreak.info

Thursday, November 16, 2017

BLOCKCHAINS IN NATIONAL DEFENSE: TRUSTWORTHY SYSTEMS IN A TRUSTLESS WORLD

Download here : Blockchains In National Defense: Trustworthy Systems In  A Trustless World

Source : http://www.dtic.mil/doctrine/education/jpme_papers/barnas_n.pdf

Extract from Abstract

The   ability   of the  USAF  to  prevail   in  the highly  contested  environment of 2040  will  be dictated by  its   ability   to   defend   cyber enabled  systems ,  and the  data within  them,  from compromise and manipulation.Yet contemporary  cyber defense  is faltering,  and incremental improvement s   seem  unlikely  to overcome   an  exponentially    growing   cyber  threat.    Thus,  an  entirely  new  model  for  cyber  defense  strategy  is  needed thats met by BLOCKCHAIN.   
Author Details
Neil  B. Barnas,  Major, USAF

Tuesday, November 14, 2017

HashGraph : An overview with example

Hashgraph is a superior consensus mechanism / data structure alternative to blockchain. A decentralized platform without servers built on Hashgraph technology will enable blockchain use cases to run:safe,secure and Fast.This pdf is a straight lift from http://www.swirlds.com

Monday, November 13, 2017

What is a Smart Contract? A Beginner’s Guide

A non technical,easy over view of what simply a Smart Contract means? Smart contracts help you exchange money, property, shares, or anything of value in a transparent, conflict-free way, while avoiding the services of a middleman. The best way to describe smart contracts is to compare the technology to a vending machine. Ordinarily, you would go to a lawyer or a notary, pay them, and wait while you get the document. With smart contracts, you simply drop a bitcoin into the vending machine (i.e. ledger), and your escrow, driver’s license, or whatever drops into your account. More so, smart contracts not only define the rules and penalties around an agreement in the same way that a traditional contract does, but also automatically enforce those obligations.


Tuesday, November 7, 2017

TRANSACTION MALLEABILITY : SIMPLY

Although little old video...but is good to give an easy to understand explanation on What Transaction Malleability is?

TRANSACTION MALLEABILITY : A DEMO TO GET AN OVERVIEW OF WHAT IT IS?

This is a demo of  presentation "Bitcoin Transaction Malleability" Theory in Practice" by Daniel Chechik. The demo simulates a trading website that is vulnerable to Transaction Malleability, by simply not following the transaction correctly. The attacker can exploit this vulnerability to receive more coins to his personal wallet than he originally should have in the first place.

Monday, November 6, 2017