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Transaction Malleability Problem
The transaction malleability problem is a vulnerability in blockchain which can be exploited by altering a cryptographic hash, such as the digital signature used to identify a cryptocurrency transaction. Transaction malleability is considered to be one of the largest ongoing threats to blockchain technology, as it can compromise financial transactions such as Bitcoin Bitcoin ( abbreviation: BTC; sign: ₿) is a decentralized digital currency that can be transferred on the peer-to-peer bitcoin network. Bitcoin transactions are verified by network nodes through cryptography and recorded in a public di ... and other cryptocurrency transaction, and cause other issues in the network. Discovery The transaction malleability problem became known to the Bitcoin community in 2011. In February 2014, Japanese Bitcoin exchange Mt. Gox revealed that they had been targeted by an exploit in Bitcoin protocol called "Transaction Malleability". At the time, Mt. Gox was the world's la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blockchain
A blockchain is a type of distributed ledger technology (DLT) that consists of growing lists of records, called ''blocks'', that are securely linked together using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data (generally represented as a Merkle tree, where data nodes are represented by leaves). The timestamp proves that the transaction data existed when the block was created. Since each block contains information about the previous block, they effectively form a ''chain'' (compare linked list data structure), with each additional block linking to the ones before it. Consequently, blockchain transactions are irreversible in that, once they are recorded, the data in any given block cannot be altered retroactively without altering all subsequent blocks. Blockchains are typically managed by a peer-to-peer (P2P) computer network for use as a public distributed ledger, where nodes collectively adhere to a consen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cryptographic Hash Function
A cryptographic hash function (CHF) is a hash algorithm (a map of an arbitrary binary string to a binary string with fixed size of n bits) that has special properties desirable for cryptography: * the probability of a particular n-bit output result ( hash value) for a random input string ("message") is 2^ (like for any good hash), so the hash value can be used as a representative of the message; * finding an input string that matches a given hash value (a ''pre-image'') is unfeasible, unless the value is selected from a known pre-calculated dictionary ("rainbow table"). The ''resistance'' to such search is quantified as security strength, a cryptographic hash with n bits of hash value is expected to have a ''preimage resistance'' strength of n bits. A ''second preimage'' resistance strength, with the same expectations, refers to a similar problem of finding a second message that matches the given hash value when one message is already known; * finding any pair of different me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bitcoin
Bitcoin ( abbreviation: BTC; sign: ₿) is a decentralized digital currency that can be transferred on the peer-to-peer bitcoin network. Bitcoin transactions are verified by network nodes through cryptography and recorded in a public distributed ledger called a blockchain. The cryptocurrency was invented in 2008 by an unknown person or group of people using the name Satoshi Nakamoto. The currency began use in 2009, when its implementation was released as open-source software. The word "''bitcoin''" was defined in a white paper published on October 31, 2008. It is a compound of the words ''bit'' and ''coin''. The legality of bitcoin varies by region. Nine countries have fully banned bitcoin use, while a further fifteen have implicitly banned it. A few governments have used bitcoin in some capacity. El Salvador has adopted Bitcoin as legal tender, although use by merchants remains low. Ukraine has accepted cryptocurrency donations to fund the resistance to the 2022 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mark Karpelès
Mark Marie Robert Karpelès (born June 1, 1985), also sometimes known by his online alias MagicalTux, is the former CEO of bitcoin exchange Mt. Gox. Born in France, he moved to Japan in 2009. Early life and education Born in Chenôve, France, he is the child of Anne-Robert Karpelès, a geologist. He was raised in Dijon. Between 1995 and 2000 he was educated at Collège Prieuré de Binson in Châtillon-sur-Marne, near Dormans. He then spent one year at Lycée Claude Bernard in Paris before completing his education in 2003 at Lycée Louis Armand in Paris. Career According to Karpelès' LinkedIn page, he worked from 2003 to 2005 at Linux Cyberjoueurs as a software developer and network administrator. Karpelès is a PHP developer. In 2009, Karpelès founded Tibanne Co. Ltd., a Japan-based bitcoin related technology provider. He is CEO. He was a founding member of the Bitcoin Foundation, created in 2012 with a mission to standardize and promote bitcoin, and served on its board ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silk Road 2
Silk Road was an online black market and the first modern darknet market. It was launched in 2011 by its American founder Ross Ulbricht under the pseudonym "Dread Pirate Roberts". As part of the dark web, Silk Road operated as a hidden service on the Tor network, allowing users to buy and sell products and services between each other anonymously. All transactions were conducted with bitcoin, a cryptocurrency which aided in protecting user identities. The website was known for its illegal drug marketplace, among other illegal and legal product listings. In October 2013, the Federal Bureau of Investigation (FBI) shut down Silk Road and arrested Ulbricht.Ars TechnicaHow the feds took down the Dread Pirate Roberts, 3 October 2013 Silk Road 2.0 came online the next month, run by former site administrators, but was shut down the following year as part of Operation Onymous. In 2015, Ulbricht was convicted in federal court for multiple charges related to operating Silk Road and was gi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
