TL;DR : We’ve designed and implemented a token contract which allows us to transfer bundles of different types of tokens for 80% to 90% less gas than ERC-20 and ERC-721. This is accomplished by “packing” different token balances together, saving a substantial amount of storage space on the blockchain. One…

Or, how to make money while freeing the Ethereum blockchain from useless data. TL; DR: In this article, I introduce the concept of GasToken Factories. When storage variables are deleted from the blockchain, the sender of the transaction receives a gas refund (or negative gas) which can substantially reduce the…

Many token sales have used a whitelist process in the last year, where only approved users are able to contribute. This is almost always accomplished with an on-chain whitelist, where the owner of the token sale contract update a mapping variable (e.g. mapping (address=>bool) public whitelisted) for each user that…

This post outlines major development updates during the month of November 2017. This November, we have been hard at work on several major projects including Order Watcher, 0x Connect, 0x Deployer and transitioning our Typescript codebase to a mono repo architecture. …

This post outlines major development updates during the month of October 2017. Changes to 0x.js Subscription methods refactored. Subscription methods involving logs and events have been rewritten to use ethereumjs-blockstream under the hood, properly handling block and log removals, on-chain reorgs and block/log backfills on skipped blocks (e.g. when on a bad connection)…

This post outlines major development updates during the month of September. Introducing Monthly Development Updates Development updates will be released at the end of each month to summarize key highlights of the work completed by the 0x core team. They will cover the 0x.js …