(PDF) CoinParty: Secure Multi-Party Mixing of Bitcoins

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In practice a transaction is considered secure after six confirmations, i.e., six blocks. With Proof-of-Work, Bitcoin developers ensure that deliberately creating a fork to eventually replace the main block chain becomes very expensive; a malicious user must mine new blocks faster than all other miners in the network combined. This means that the malicious miner must hold at least 51% of all ... 1 BitIodine: extracting intelligence from the Bitcoin network Michele Spagnuolo 2 Bitcoin BitIodine 3 About Bitcoin Decentralized, global digital currency A global peer-to-peer network, across which transactions are broadcast Can support strong anonymity - implementations not strongly anonymous Recent clarification to US regulations - to be considered as foreign currency and not legal tender Most common assumption is that if we get six confirmations ... BitIodine: Extracting Intelligence from the Bitcoin Network . Conference Paper. Full-text available. Mar 2014; Michele Spagnuolo ... Bitcoin is a popular cryptocurrency that records alltransactions in a distributed append-only public ledger calledblockchain. The security of Bitcoin heavily relies on the incentive-compatible proof-of-work (PoW) based distributed consensus pro-tocol, which is run by network nodes called miners. In exchangefor the incentive, the miners are expected to honestly maintainthe blockchain. By analyzing the major security mechanisms in the Bitcoin protocol, we create an understanding of how it is guarded from some of the most common attacks. Critical Bitcoinfeatures addressed in this report is among others: decentralization through a peer-to-peer network, proof of work through mining and asymmetric key accounts. The major conclusion of the report is that with the current ...

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