Open in app

Sign In

Write

Sign In

0x91d9
0x91d9

56 Followers

Home

About

Pinned

Tutorial Hyperledger Iroha V1🌸

Set up Hyperledger Iroha V1 and use SDK for interacting. Overview Hyperledger Iroha Hyperledger Iroha is a general-purpose permissioned blockchain system that can be used to manage digital assets, identity, and serialized data. …

Hyperledger Iroha

6 min read

Tutorial Hyperledger Iroha V1🌸
Tutorial Hyperledger Iroha V1🌸
Hyperledger Iroha

6 min read


Published in CoinsBench

·Pinned

Tuning your smart contract

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…

Ethereum

9 min read

Tuning your smart contract
Tuning your smart contract
Ethereum

9 min read


Published in BLOCK6

·Pinned

Pseudo Radom Number Generator with Signed message

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

Smart Contracts

5 min read

Pseudo Radom Number Generator with Signed message
Pseudo Radom Number Generator with Signed message
Smart Contracts

5 min read


Published in CoinsBench

·Nov 7, 2022

Searching the data on unverified contract

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…

Ethereum

3 min read

Searching the data on unverified contract
Searching the data on unverified contract
Ethereum

3 min read


Published in CoinsBench

·Oct 26, 2022

Events and Logs in Smart Contract

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…

Solidity

4 min read

Events and Logs in Smart Contract
Events and Logs in Smart Contract
Solidity

4 min read


Published in BLOCK6

·Jul 7, 2022

This is one of what you expect after The Merge

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. …

Blockchain

2 min read

This is one of what you expect after The Merge
This is one of what you expect after The Merge
Blockchain

2 min read


Published in CoinsBench

·Apr 6, 2022

The new Language but the old mistake (RTLO) in Solidity

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…

Smart Contract Blockchain

4 min read

The new Language but the old mistake (RTLO) in Solidity
The new Language but the old mistake (RTLO) in Solidity
Smart Contract Blockchain

4 min read


Published in BLOCK6

·Mar 20, 2022

Why we should be aware of the hiding malicious code in smart contracts

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…

Smart Contract Blockchain

4 min read

Why we should be aware of the hiding malicious code in smart contracts
Why we should be aware of the hiding malicious code in smart contracts
Smart Contract Blockchain

4 min read


Jan 12, 2021

Inter Planetary File System (IPFS)🌎

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.”

P2p

5 min read

InterPlanetary File System (IPFS)🌎
InterPlanetary File System (IPFS)🌎
P2p

5 min read

0x91d9

0x91d9

56 Followers

Blockchain & Distributed Technology enthusiast

Following
  • 胡家維 Hu Kenneth

    胡家維 Hu Kenneth

  • (λx.x)eranga

    (λx.x)eranga

  • BlockSec

    BlockSec

  • SlowMist

    SlowMist

  • InfoSec Write-ups

    InfoSec Write-ups

Help

Status

Writers

Blog

Careers

Privacy

Terms

About

Text to speech