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AlexGo Audit

Reading Time: 6 minutes

Introduction CoinFabrik was asked to audit the contracts for the AlexGo project. First we will provide a summary of our discoveries and then we will show the details of our findings. Summary The contracts audited are from the alex-v1 repository athttps://github.com/alexgo-io/alex-v1. The audit is based on the commit0913c9eb0c8f79b3cd0b843641075ce27d437c96. Fixes were made and rechecked based on […]

Censorship of Harmful Data in Blockchains

Reading Time: 17 minutes

Public blockchains allow insertion of arbitrary data. Even specific-purpose blockchains like Bitcoin already contain a lot of non-financial data. Although this data insertion can be beneficial in some use cases (e.g. proof of existence), it can also cause damage. If a blockchain contained videos with instructions on how to torture someone, there would immediately be broad consensus that this data must be deleted. But since blockchains are supposed to be immutable databases, the question is: what can be done if this happens?

A Short Guide Through the Universe of Blockchain Based Micropayment Systems

Reading Time: 7 minutes

Micropayment take place in pay-as-you-go software service models, micro donations, and the Internet of Things (IoT). In these contexts payments for values which are usually under the smallest unit of fiat money (e.g. $0.001) are needed. Prepaid cards can solve this problem. Another approach uses cryptocurrencies in the blockchain, having the advantage of allowing exact […]

Using the CardContact SmartCard USB HSM in an Ethereum PoA Chain

Reading Time: 4 minutes

After testing the performance of Ethereum using PoA, we tested the usability of the CardContact SmartCard-HSM USB token on an ethereum Proof of Authority network. The HSM allows to store and use multiple encryption keys, both RSA and Elliptic Curves (including secp256k1), for applications like issuing certificates as a CA, and with any application that […]