The purpose of this configuration is to generate a Docker environment of 2 nodes connected together running on Geth and monitor them using Ethstat (at localhost:3000). Then we can use MetaMask as well as Remix to connect to the first node (localhost:8545) to send simple transtractions, like sending Ether, or complex transactions like the creation or call of a smart contract.
Following our Smart Contract Auditing: Human vs. Machine article, we now analyze Slither, which is another static analysis tool from Trail of Bits. It includes aids for contract summaries, which can be helpful for making a mental model of the contract and rechecking assumptions. Considering the ease of use, it’s a good idea to try […]
These last years there has been growth in Smart Contracts development, predominantly in the Ethereum blockchain. Ethereum, being a different type of blockchain than Bitcoin, can execute concise lines of code inside its chain, a job that Bitcoin (specifically designed to send transactions easily) can’t do. Here is where RSK intervenes building a sidechain tied up to Bitcoin through a 2-Way Peg system, managed by the Federation Partners, that makes code execution possible. Instead of designing a new programming language for developing Smart-Contracts, they used Solidity, the same language that Ethereum uses. This has two benefits: not only programmers won’t have to learn a new skill but also contracts in the Ethereum network could be deployed in RSK without much effort, taking advantage of the vast market capitalization Bitcoin has.
Coinfabrik was asked to audit the smart contracts for the Send Token sale. In the first part, we will give a summary of our discoveries and follow them with the details of our findings.
Send (SDT) is making an ICO to create a 7-day price-stable crypto token that discovers a new market price once a week.
Solidity semantics are confusing for smart contract developers with experience in traditional programming languages. This semantics can lead to security issues like the one we found in a recent smart contract security audit we did. The following code caught our attention: In the above code, the create method stores the same information in two different […]
We describe a geth source code change which enables faster block mining. We hope this option will be included in Ethereum command lines. Private Ethereum blockchains may be deployed by private entities to use in production or in the software development process. There are different ways of speeding the development environment. Some developers choose an […]
Working for our customers in our blockchain development company we built this spreadsheet which is a work in progress, comments are welcome here, which describes the features of multiple blockchain and sidechain technologies. Views about blockchain technologies range from hype to skepticism. A blockchain is a distributed database and consensus network that can be used to […]
A recent paper titled The Blockchain Anomaly presents the difficulties the authors encountered when trying to make two transactions interdependent such that the second transaction cannot be executed without the first being confirmed. Although the paper may be useful as a guide, the title is misleading since Bitcoin does not guarantee the order of transactions (no […]