This paper examines cryptocurrency as a digital medium of exchange secured through cryptographic principles. Beginning with foundational concepts of how cryptocurrencies function through peer-to-peer networking and blockchain technology, the paper introduces Darkcoin (DRK) as a privacy-focused alternative to Bitcoin. The paper details Darkcoin's key technical features—Darksend, masternodes, and InstantX—which enable anonymous and near-instantaneous transactions. The paper concludes by analyzing Darkcoin's potential applicability in Islamic financial contexts, particularly Saudi Arabia, where it could serve foreign workers seeking low-cost international remittances while remaining compliant with Sharia law principles.
Crypto is a term that abbreviates cryptography. According to Vacca (2010), the word cryptography emanates from two words: "crypto" and the Greek term "graphikos." The former means a secret that is hidden or concealed, while the latter means writing. Combined, these words denote a concealing place for notions, words, images, and sounds. A cryptocurrency is a form of exchange similar to conventional currencies—such as euros, dollars, and pounds—but created specifically for exchanging digital data and information through procedures made possible by particular cryptographic ideologies.
In essence, cryptography is employed in safeguarding transactions and regulating the generation of new coins. Bitcoin, the original cryptocurrency, was unveiled in 2009. In the present day, numerous other cryptocurrencies—better known as altcoins—have been developed to offer alternative features and use cases.
The concept of cryptocurrency originated with Satoshi Nakamoto, who developed Bitcoin. Cryptocurrencies are essentially electronic cash that enables the final transmission—not duplication—of digital assets in a manner that can be verified and substantiated by users without relying on third parties. This process operates through three key systems: peer-to-peer (P2P) networking, public key cryptography, and a proof-of-work mechanism.
Similar to PayPal, which acts as a third-party intermediary for transferring funds, cryptocurrencies employ a ledger called the blockchain. All transactions undertaken through cryptocurrencies—including recording and reconciling—are documented in the blockchain. However, unlike PayPal's ledger, the blockchain is not controlled by a centralized entity. Instead, it is a public document distributed in a peer-to-peer manner across thousands of nodes within the cryptocurrency network.
New transactions are tested through the blockchain to ensure that no cryptocurrency units have been previously used (a problem known as double spending). Importantly, this verification is not performed by a single trusted intermediary. Rather, thousands of users participate in the process, distributing the work among themselves as they contribute their computing power to resolve and maintain the blockchain ledger (Higgins, 2014).
The solution to the double-spending problem represents a major innovation. Before cryptocurrencies, the only way to overcome this issue was to employ a trusted third party. For example, if two parties—James and Virginia—wished to exchange funds, they would rely on a trusted intermediary such as PayPal. This intermediary maintains a record of account balances and transactions. If Virginia sends $200 to James, she notifies PayPal, which subtracts the amount from her account and adds it to his. The transaction is resolved, and Virginia cannot spend the same $200 again. However, with cryptocurrencies, this solution is achieved without requiring a third-party intermediary (Dourado and Broti, 2014).
Darkcoin, abbreviated as DRK, is an openly developed digital currency established with privacy as its core principle. This cryptocurrency enables individuals to keep their finances private while conducting transactions that are functionally identical to cash transactions. Darkcoin offers the confidentiality and privacy features that Bitcoin cannot provide, because Bitcoin's transactions are transparent and publicly visible on the blockchain.
Many Bitcoin users prefer not to have their account balances or financial transactions visible to the general public. Darkcoin addresses this preference by incorporating advanced privacy technologies, including obfuscation and the concealment of internet protocol (IP) addresses. However, it is important to note that privacy in cryptocurrencies remains an evolving field. While developments and improvements continue, it is unlikely that any cryptocurrency will guarantee complete anonymity in the near term (Tonewsto, 2014).
One of the primary components of Darkcoin is Darksend, a peer-to-peer networking structure that packages small financial transactions into larger, obscured transactions. Darksend is based on the concept of CoinJoin, created by Gregory Maxwell, which serves to bundle transactions together. Unlike Bitcoin, Darkcoin's transaction unification makes it significantly more difficult to determine where payments within the network originate or where they are directed. Darksend also integrates masternodes, which account for transactions in a decentralized manner (Higgins, 2014).
Masternodes operate within a proof-of-service system and act as transaction bundlers, receiving approximately ten percent of block rewards for performing this function. A selection system arbitrarily allocates which masternode will handle a bundle of Darkcoin transactions. According to Higgins (2014), masternodes efficiently distribute dividends evenly across the network over time. Establishing a masternode requires one thousand darkcoins, ensuring that only participants with a vested interest in the network's integrity can operate these nodes, thereby preventing poor performers from interfering with transactions.
Darksend is entirely decentralized and eliminates the need for third-party involvement. Currently, there is a restriction of one hundred darkcoins per transaction when using Darksend to transfer funds. However, this limitation is not expected to persist, as it can be addressed without permanently restricting the feature. The entire Darksend transaction process takes approximately one minute and sixty seconds, but this duration ensures that it is extremely difficult to trace the transaction's origin. Notably, Darksend transactions are discretionary and optional, allowing users to choose whether a particular transaction should be traceable—a capability that could be valuable in various situations (Higgins, 2014).
InstantX is an emerging feature being developed for Darkcoin that will enable nearly instantaneous transactions. One of Darkcoin's unique selling points is the speed at which users can send money and conduct transactions worldwide. However, there is a critical distinction between perceiving a transaction in a consumer's wallet and actually being able to spend it—a notable limitation of Bitcoin for many users.
InstantX aims to minimize the time between receiving a transaction and having the ability to spend it to just two seconds or less. According to Buntix (2014), Evan Duffield, the developer of DRK, verified a transaction using InstantX from one wallet to another in approximately two seconds, allowing the funds to be spent immediately. This feature requires DRK masternodes to achieve consensus on the transaction. Once consensus is reached, the inputs are locked in a process that takes approximately two seconds total. Once transactions are locked, the funds can be spent instantaneously (Buntix, 2014).
"Potential adoption and barriers in Islamic banking systems"
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