How to balance UX and security with semi-custodial tokens Problem Blockchain technology is branching beyond finance. Tokens are now being used in games, art, social networks etc. This is to be expected as the space and the tech continues to mature. But using the technology requires at minimum: Downloading a crypto…

Implementing EIP-712: Typed structured data hashing and signing Overview The idea of EIP-712 is to standardize hashing and signing of typed structured data as instead to just byte strings. Below are the different ways of signing Signing a transaction Signing a message (hexadecimal string). Signing typed data Signing typed data allows…

The many ways of generating random numbers on chain. Overview Smart contracts are deterministic, meaning anyone with the code and input can predict the output. Smart contracts are also public. Given public code, how can we make this non-deterministic? Below are a few techniques Pseudorandom Number by Hashing On-chain Verifiable Random…

Calling sync() and skim() in Remix. Overview In this article we will call the sync() function to fix stuck pairs. This happens when someone removes everything from a pool leaving dust. These small amounts might account for large changes. Syncing will update the reserves to the current balances. This will work…

How to build server side wallets for web3 game developers. Question I want players to be take items drops (not NFT regular items) to a merchant NPC. The merchant will take hand out a token. Overview There are a few ways to build a crypto game. All data is on chain. This…

Simple question. Complicated solution. TLDR There’s no all in one solution (yet). Problem I make login with metamask on my website. But I want to get all tokens (Such as BNB, RARI and etc) balance in metamask. How do i get all tokens balance? How do I get all the tokens inside my Metamask wallet by web3 or others? As you already figured out in the comments, nobody knows all the token balances of your account, not even MetaMask…stackoverflow.com

https://github.com/graphprotocol/graph-node/blob/master/docker/README.md

Using OpenZepplin Solidity Contract Wizard Overview In this example we will Deploy token contract Delegate to vote Deploy governor contract Transfer token contract ownership to governor contract Create a proposal to mint Cast a vote Execute transaction Verify execution Deploy a Token Contract We will use OpenZepplin’s Contract Wizard Contracts Wizard Use the interactive generator below to bootstrap your smart contract and learn about OpenZeppelin Contracts. Contracts…wizard.openzeppelin.com

Using Docker, The Graph, Graph-Node and OpenZepplin Subgraphs — Introduction The Graph supports many networks such as Ethereum, xDAI, BSC etc. This article will explain how to build a subgraph with a custom network RPC.