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In contrast to traditional contracts, cryptocurrency-based smart contracts can provide improved business automation and more transparency. However, not all cryptocurrencies support expressive contract...
The feasibility of bribing attacks on cryptocurrencies was first highlighted in 2016, with various new techniques and approaches having since been proposed. Recent reports of real world 51%51% attacks...
Many cryptocurrencies, such as Bitcoin and Ethereum, do not provide any financial privacy to their users. These systems cannot be used as a medium of exchange as long as they are transparent. Therefor...
Blockchain based systems, in particular cryptocurrencies, face a serious limitation: scalability. This holds, especially, in terms of number of transactions per second. Several alternatives are curren...
To ensure the validity of transactions, cryptocurrencies such as Bitcoin and Ethereum require nodes to verify that a proof-of-work blockchain is valid. Unfortunately, this often entails downloading an...
In this paper, we compute hundreds of Bitcoin private keys and dozens of Ethereum, Ripple, SSH, and HTTPS private keys by carrying out cryptanalytic attacks against digital signatures contained in pub...
Permissionless blockchain systems, such as Bitcoin, rely on users using their computational power to solve a puzzle in order to achieve a consensus. To incentivise users in maintaining the system, new...
The increasing number of cryptocurrencies, as well as the rising number of actors within each single cryptocurrency, inevitably leads to tensions between the respective communities. As with open sourc...
Despite their usage of pseudonyms rather than persistent identifiers, most existing cryptocurrencies do not provide users with any meaningful levels of privacy. This has prompted the creation of priva...
Unspent Transaction Outputs (UTXOs) are the internal mechanism used in many cryp- tocurrencies to represent coins. Such representation has some clear benefits, but also entails some complexities that,...
In [1], an abstract accounting model for UTXO-based cryptocurrencies has been presented. However, that model considered only the simplest kind of transaction (known in Bitcoin as pay-to-pubkey-hash) a...
Cryptocurrencies and blockchains are set to play a major role in the financial and supply-chain systems. Their presence and acceptance across different geopolitical corridors, including in repressive ...
A treasury system is a community controlled and decentralized collaborative decision-making mechanism for sustainable funding of the blockchain development and maintenance. During each treasury period...
Decentralized cryptocurrencies rely on participants to keep track of the state of the system in order to verify new transactions. As the number of users and transactions grows, this requirement places...
Cryptocurrencies are historically divided in two broad groups with respect to the style of transactions that they accept. In the account-based style, each address is seen as an account with a balance,...

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