ERC-20 token standard contains a major logical flaw — lack of communication model (lack of transaction handling model). This problem is well-known. I wrote tens of articles on Ethereum reddit, gitter and github during the past 6 years. Starting from this post. Also, here is Vitalik Buterin’s comment on this. …

ERC-20 is the oldest (and the first) Ethereum “token standard” — a documentation of a template of a token that everyone can use to create new tokens. ERC-20 defines two methods of transferring tokens: transfer function — a “push” transaction of a token. approve function that authorizes someone to perform…

In this article I’ll cover the process of a ERC-223 token creation. The token can be created on any EVM-compatible chain such as Ethereum, Arbitrum, Optimism and many more. You will need: Browser Wallet Native currency (ETH on Ethereum) to cover the gas fee IDE, in this example I’m using…

Poloniex exchange was just hacked. A hacker made this transaction https://etherscan.io/tx/0xc9700e4f072878c4e4066d1c9cd160692468f2d1c4c47795d28635772abc18db And the tokens got permanently frozen in the contract of GLM! This shouldn’t have happened if ERC-20 GLM token would be developed with security practices in mind. …

ERC-20 (Ethereum Request for Comment no. 20) is a proposal created in 2015 that described how a common token must look like in Ethereum. Here are some references: ERC-20 token implementation in solidity OpenZeppelin documentation Original discussion thread “How to create a ERC-20 token” guideline ERC-20 token standard has a…

Dex223 media We will use Callisto media to publish Dex223 news and updates for now. This will also allow us to drive the traffic from general announcements (on Ethereum or general crypto media) directly to Callisto Network media. ERC-223 <-> ERC-20 token converter EIP is submitted. There is an ongoing process of separating EIPs and ERCs on…

A couple of word about myself I am Dexaran, a founder of EthereumCommonwealth team, security auditor, hacker (I have DDOSed EOS mainnet in 2019 and froze its DAPPs for half a year and drained Chintai exchange). Founder of Callisto Security auditing organization. We have audited more than 300 smart-contracts and not even a single one that…

This article describes the implementation of https://github.com/Dexaran/CallistoDAO and how it is different from the original TheDAO. Callisto DAO is based on the source code of TheDAO that was hacked in 2016 and caused Ethereum-ETC split. The original DAO whitepaper can be found here. 1. Updated syntax / Solidity version The original DAO contract was written 7…

The Immortal Lottery is an autonomous smart-contract that implements a fully decentralized gambling APP on-chain. Without any third parties involved, without any off-chain non-verifiable sources of entropy. You can read more about the Immortal Lottery details here. The lottery is deployed on Callisto Network mainnet: Entropy contract 0xad4e8434649BDa8bD2fF27e2e3E5a49BC3d5A661 Lottery contract…