A simple way to optimize your smart contract with a solidity optimizer in the right way. What is the Gas in Ethereum? Gas refers to the unit that measures the amount of computational effort required to execute specific operations on the Ethereum network. Since each Ethereum transaction requires computational resources to execute, each transaction requires a…

An alternative way to do secure random on smart contract — Problems Solidity is not capable of creating random numbers. Don’t generate random numbers inside your contracts. It won’t work, you will get hacked. Create your own’s algorithm for random numbers by readings blockchain env as a source of random the random number is 100% predictable and blockchain env can be manipulated Approach 1:Simple Onchain random

Demonstration of brute force storage slot on smart contract Introduction Most people say that the data on the blockchain is transparency so anyone can see it, the truth is you can see it but you maybe can’t read it because smart contracts are basically bytecode and it’s non-human readable, This article…

Why you should concern about events and logs based on my development experience Introduction A logging policy states what types of activities your application should track. Basically, your policy should state what types of actions need to be logged in order to trace potential fraud, inappropriate use, etc. credit https://stackoverflow.com/questions/4674108/what-is-a-logging-policy In…

random with 0x44 OPCODE Introduction Solidity is not capable of creating random numbers. Don’t generate random numbers inside your contracts. It won’t work, you will get hacked. …

Right-To-Left Override (RTLO) is a well-known mistake that appeared in Solidity. What is Right To Left Attack? Right-To-Left Override is a Unicode mainly used for the writing and reading of Arabic or Hebrew text. Unicode has a special character, U+202e, that tells computers to display the text that…

how they hide malicious code and how they can use malicious code to exploit What is malicious code? Malicious code is unwanted files or programs that can cause harm to a computer or compromise data stored on a computer. Various classifications of malicious code include viruses, worms, and Trojan horses. Viruses have the ability…

ระบบไฟล์ระหว่างดาวเคราะห์🤔 ใน 5 นาที — Inter Planet File System (IPFS) แบบ Overview IPFS เริ่มจาก Juan Benet ต้องการสร้างระบบที่สามารถแชร์ไฟล์จำนวนมากได้ๆ แต่ยังคงต้องรวดเร็วและติดตาม Version ของไฟล์ได้ ลักษณะแนวคิดเดียวกับ Git แต่ทว่ามันต้องกระจายศูนย์กลางแล้วก็ยังสามารถเก็บไว้ได้อย่างถาวร ซึ่งถ้าฟังผ่านๆ ดูก็จะรู้สึกฟุ้งมากๆ “One-line definition of IPFS: IPFS is a distributed system for storing and accessing files, websites, applications, and data.”