Auroracoin is a decentralised, peer-to-peer, and secure cryptocurrency released as an alternative to the Icelandic Króna to bypass governmental restrictions associated with the national fiat currency. It was launched with the aim of becoming the ‘official’ cryptocurrency of Iceland. AUR was a pioneer in the area of country-specific cryptocurrencies. AUR was launched on the 25th of January, 2014, by an anonymous developer who went by the pseudonym of Baldur Friggjar Óðinsson. It was originally based on Litecoin, using the Scrypt algorithm with a Proof of Work mechanism, but was later updated to use a multi-algorithm architecture in 2016, forked from DigiByte. Auroracoin uses the PoW consensus mechanism, which utilises device hashing power to solve a complex mathematical problem in order to authenticate a transaction proposed to be stored in the blockchain. The difficulty of solving the problem ensures that authenticating forged transactions is very difficult unless the attacker owns an impractically large chunk of the network’s total hashing power. AUR is one of the only cryptocurrencies to use a combination of five different hashing algorithms, namely Grøstl, Qubit, scrypt, SHA-256, and Skein. While initially very popular, Auroracoin has seen little to no activity for a while, with poor marketing, and frequent dev team changes. Reasons for little growth have been various, from slow adoption in Iceland, to developers leaving and joining the project midway. However, it is expected to not go lower than the recent low, and might see a rise as AUR plans to launch a more aggressive marketing campaign in Iceland to promote the coin among the masses. Unlike most other altcoins, Auroracoin has made extensive changes to the original codebase. It has introduced security measures such as Automatic checkpointing, and protecting against known flaws present in the BTC blockchain, such as 51% block replacement attacks.
BCAChain Using self-optimized POBC (goodwill certification) as the underlying consensus mechanism, and introducing the real world credit system to provide better operation and support for anonymous block chain network. BCAChain Focus on the new retail industry with rich landing scenarios, aiming at creating a supply chain traceability, quantifiable credit, transparent data, consumer shopping, membership services, precision marketing, centralized procurement scenarios in one, forming online e-commerce transactions, offline shopping experience, and building a new retail public chain ecology with multi-participation and multi-benefit. On November 8, 2018, BCAChain Foundation officially joined China Cloud System Industry Innovation Strategic Alliance as a governing unit. At present, BCAChain has completed the release of open source code at the bottom of block chain, wallet and DAPP application, and is expected to be on the main line in the second half of 2019.