Articles on Ethereum smart contract development: Solidity, DeFi protocol design, upgradeable contracts, and Foundry fuzz and invariant testing.https://reignarklabs.com/https://reignarklabs.com/blog/erc7201-namespaced-storage-per-module/https://reignarklabs.com/blog/erc7201-namespaced-storage-per-module/How to give each module of an upgradeable Solidity protocol its own ERC-7201 storage namespace: naming, the erc7201 builtin, safe struct changes and tests.Thu, 15 Oct 2026 00:00:00 GMTSmart contractsERC-7201Storage layoutUpgradeable contractshttps://reignarklabs.com/blog/solidity-layout-at-custom-storage-layout/https://reignarklabs.com/blog/solidity-layout-at-custom-storage-layout/How Solidity's layout at specifier and the new erc7201 builtin move contract storage, how that differs from ERC-7201 namespaced structs, and the pitfalls.Thu, 15 Oct 2026 00:00:00 GMTSmart contractsSolidityStorage layoutUpgradeable contractshttps://reignarklabs.com/blog/structuring-a-solidity-protocol-codebase/https://reignarklabs.com/blog/structuring-a-solidity-protocol-codebase/A practical layout for a Solidity protocol: interfaces, core and periphery, modules that own their state, libraries and inheritance, and why each matters.Thu, 15 Oct 2026 00:00:00 GMTSmart contractsSolidityArchitectureUpgradeable contractshttps://reignarklabs.com/blog/erc4626-inflation-attacks/https://reignarklabs.com/blog/erc4626-inflation-attacks/How the first-depositor inflation attack steals from ERC-4626 vault users, with worked numbers, and how virtual shares and internal accounting stop it.Wed, 14 Oct 2026 00:00:00 GMTSmart contractsERC-4626DeFi securitySolidityhttps://reignarklabs.com/blog/foundry-invariant-testing-lending-protocol/https://reignarklabs.com/blog/foundry-invariant-testing-lending-protocol/A practical guide to Foundry invariant tests for DeFi lending protocols: handlers, bounded inputs, ghost variables, time travel, and the invariants worth checking.Wed, 14 Oct 2026 00:00:00 GMTSmart contractsFoundryInvariant testingLendinghttps://reignarklabs.com/blog/uups-vs-beacon-vs-transparent-proxies/https://reignarklabs.com/blog/uups-vs-beacon-vs-transparent-proxies/How UUPS, beacon and transparent proxies work, what each costs, where they go wrong, and how to choose an upgrade pattern for an Ethereum protocol.Wed, 14 Oct 2026 00:00:00 GMTSmart contractsUpgradeable contractsSolidityArchitecture