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 […]
Market makers at stock exchanges are companies or individuals who stand ready to buy and sell securities. Similarly, market makers at crypto exchanges sell and buy crypto assets on a continuous basis at a publicly quoted price. Since everbody can place an order at crypto exchanges, like e.g. Binance or BitMEX, and order execution is […]
Every month several important smart contract audits are performed by blockchain security companies like us. It is important to stay up to date with the latest findings in order to learn and improve protection processes. Following we will describe three recent and interesting findings:
Two months before the AEternity Universe One Conference, CoinFabrik was asked to build the payments application that would be used in that conference. The app would be built on top of and focused on AEternity State-Channel technologies. It should include a mobile phone application allowing users to register as merchants or customers and perform payments.
CoinFabrik was asked to audit the contracts for the Nahmii Token project. Firstly, we will provide a summary of our discoveries and secondly, we will show the details of our findings.
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?
Any information stored in a blockchain is supposed to be preserved forever, nobody will be able to change it or even less erase it. But is this really true? Is there any chance that governments or private groups with enough money to finance costly attacks might delete information from a blockchain?
Facebook’s new permissioned blockchain initiative has been received with well-founded criticism, primarily related to concerns over privacy, but the battle that the Libra Association will spark around the world will probably benefit the struggle permissionless blockchains are facing.
This is a step by step guide that shows how to publish a text in the Roptsten testnet of Ethereum. In order to publish in the Mainnet you will need to select it in the first step of the following tutorial.
If you’ve been following crypto news over the past few months, you have probably heard the words Polkadot and Substrate. However, you might also be curious about what they are exactly, why they’ve been on the news so much and how relevant they are to your business. This article aims to give you a clearer […]
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 […]
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 […]