Azure Application Insights is a great tool for monitoring and analyzing your website. And quite easy to install. Just add client and server-side integrations and you are set. Right? Wrong! There are many things App Insights does right, but one thing it does wrong out of the box is page…

Alien Codex is Ethernaut level number 20 designed by Nicole Zhu. This paper presents my solution to the level. Spoiler alert. Do not read below if you want to solve it on your own. The text below contains a full solution. The goal of the level is to claim…

After recent news of SEC taking on EtherDelta, one might expect IDEX would be next in the list. We have to ask ourselves — how truly decentralized and safe IDEX is? — IDEX smart contract is present on Etherscan. Let’s dive into it. The entire smart contract is only 184 lines. Why so small one might ask? The reason behind this is that IDEX is not full capacity exchange on the blockchain. It doesn’t store its order book on the blockchain, neither…

After recent news of SEC taking on EtherDelta and probably other decentralized exchanges, we have to ask ourselves — how truly decentralized, are they? — Decentralization is a wide term and ranges from true decentralization, where smart contact on Ethereum neither can’t be changed neither can’t be stopped to some joke decentralization, like USDC, where owners of contract can pause, blacklist and swap entire contract with anything they want.

Coinbase adds its first stablecoin tied to the US Dollar. We have entered a new era of legitimate stablecoins. USDC issued by Circle, which is backed by Goldman Sachs. Making it as official and legal as it can be compared to shady Tether. Contrary to Tether, which is implemented on…

Update On November 2nd MetaMask and other dapp browsers will stop exposing user accounts by default. This will make some code from this paper to break. I will publish updated version with web3 1.0 and new MetaMask interface. Metamask is the de facto standard for dApps on the web. It injects…

You think your AWS or Digital Ocean bill for your website is killing you? — Hang on tight and you will be surprised. Typical dApp There is no such thing as typical dApp. dApps vary from games to decentralized exchanges. We are going to focus on such stats as monthly unique users and transactions per user per months. They are important to estimate costs to run dApp. …

Ethereum has ERC-20 token and EOS has EOSIO.Token. They serve the same purpose, but are they the same? — ERC-20 token is a de facto standard in Ethereum world. It is supported by all wallets, exchanges and applications. Yet, ERC-20 token is a standard, and there are a few different implementations with their own nuances. EOSIO.Token is a standard for a token and concrete implementation at EOS blockchain. EOS…

We are going to figure out what is EOS token and how you can create and deploy one yourself. — What is EOS Token? EOS contrary to Ethereum comes with the token smart contract out of the box. As Ethereum has ERC20 smart contract, EOS has eosio.token smart contract. Eosio.token smart contract allows you to create your own token by providing maximum supply and token’s literal, issue tokens to an account and transfer tokens…