ccashwell

name	type-driven-design
description	Design Solidity contracts using type-driven composition instead of inheritance. Structs encapsulate storage, free functions define behavior via `using for global`, and contracts become thin external shells. Eliminates inheritance hell, exposes the full interface explicitly, and enables granular isolated testing at every layer of composition. Based on JT Riley's type-driven-tokens pattern.

Type-Driven Solidity Design

Type-driven design replaces object inheritance with struct composition and free functions. Instead of deep inheritance trees where storage layouts are hidden and method overriding is opaque, each data concern is a standalone struct with free functions bound via using ... for ... global. Contracts compose these types and serve only as the external interface.

Reference implementation: jtriley2p/type-driven-tokens

Balancer V2 Rate Manipulation Exploit (November 2025)

Overview

Balancer V2 experienced a rate manipulation exploit on November 3, 2025, resulting in approximately $128 million in losses in the initial attack, followed by many millions more in subsequent attacks against other vulnerable pools, protocols and networks.

Attack Summary

The Vulnerability, TLDR: Down-rounding in Balancer V2's stable math (_calcOutGivenIn) allows systematic manipulation of pool invariants through accumulated rounding errors. Carefully crafted swap sequences cause rounding errors to compound.

Deploying ImmutableCreate2Factory

source: https://github.com/ProjectOpenSea/seaport/blob/main/docs/Deployment.md#setting-up-factory-on-a-new-chain Credit to @0age and the Seaport team.

Name

Address

Audit: Project Wyvern

Completed on January 2, 2018 @ 7358a6c065

Abstract

Project Wyvern is a decentralized item exchange platform (the “Platform”) comprised of three primary components: (1) The WYV Token; (2) The Wyvern Exchange; and (3) The Wyvern Decentralized Autonomous Organization (DAO). This goal of this audit has been to ascertain the overall security of the Platform. In pursuit of that goal, this author has reviewed the Solidity source code of all relevant Smart Contracts, deployed and tested a live version of the Platform on the Ethereum Main Network.

This audit is presented as a Code Review which reflects a deep analysis of the Smart Contracts that comprise the Platform. It is broken into sub-sections, each of which relate to a single Smart Contract. Each sub-section includes a link to the Smart Contract’s Solidity source code as it stood at the ti

Keybase proof

I hereby claim:

I am ccashwell on github.
I am ccashwell (https://keybase.io/ccashwell) on keybase.
I have a public key whose fingerprint is DD00 5D98 747D 1207 DBBB EB9B 5BA0 9DC7 E2E8 DA34

To claim this, I am signing this object:

	import * as hre from "hardhat";
	import { RequestArguments } from "hardhat/types";

	import { BigNumber } from "@ethersproject/abi/node_modules/@ethersproject/bignumber";
	import { Block } from "@ethersproject/abstract-provider";
	import { SignerWithAddress } from "@nomiclabs/hardhat-ethers/signers";

	// Mine the next block
	export async function mineBlock(): Promise<void> {
	await rpc({ method: "evm_mine" });

	mask_value,gene_value,cattribute_name,cattribute_type,recessiveness
	0x000000000000000000000000000000000000000000000000000000000000001f,0x000000000000000000000000000000000000000000000000000000000000000b,himalayan,body,D
	0x00000000000000000000000000000000000000000000000000000000000003e0,0x0000000000000000000000000000000000000000000000000000000000000160,himalayan,body,R1
	0x0000000000000000000000000000000000000000000000000000000000007c00,0x0000000000000000000000000000000000000000000000000000000000002c00,himalayan,body,R2
	0x00000000000000000000000000000000000000000000000000000000000f8000,0x0000000000000000000000000000000000000000000000000000000000058000,himalayan,body,R3
	0x000000000000000000000000000000000000000000000001f000000000000000,0x0000000000000000000000000000000000000000000000008000000000000000,caffeine,eyes,D
	0x00000000000000000000000000000000000000000000003e0000000000000000,0x0000000000000000000000000000000000000000000000100000000000000000,caffeine,eyes,R1
	0x0000000000000000000000000000000000000000000007

	import Quill from 'quill'
	import TableComponent from 'TableComponent'
	import ReactDOM from 'react-dom'

	const QuillEmbed = Quill.import('blots/block/embed');

	class QuillTable extends QuillEmbed {
	static create(values) {
	let node = super.create(values);

	<script>
	/* Put this in theme.liquid, preferably right before "</body>" */
	(function() {
	var discountParam = document.location.search.match(/discount=(\w+)/);
	if (discountParam && discountParam.length > 1) {
	document.cookie = discountParam[0];
	}
	})();
	</script>