Smart Contracts

Opcode Gas Changes (Complete Guide) Opcode Gas Changes are one of the quiet reasons smart contracts become cheaper, more expensive, safer, or suddenly fragile after a network upgrade. Every EVM instruction has a cost, and those costs are not frozen forever. When Ethereum reprices storage reads, account access, memory copying, refunds, contract creation, or new

Price Oracle Risks: Manipulation, TWAPs, and Safe Design (Complete Guide) Price Oracle Risks sit at the center of modern smart contract security because almost every lending market, perp venue, stable asset system, vault, liquidation engine, collateral manager, and bridge-linked settlement layer depends on some external or derived view of price. If the oracle is wrong,

Safe Math and Overflow: Pattern, When to Use It, and Common Implementation Bugs (Complete Guide) Safe Math and Overflow are still critical smart contract topics even though modern Solidity added automatic overflow and underflow checks in normal arithmetic. The pattern is no longer just “import SafeMath everywhere.” The real question is when checked arithmetic is

Smart Contract Audits: Scope, Methods, and How to Prepare (Complete Guide) Smart Contract Audits are not just document reviews, they are adversarial reviews of code that will hold value, permissions, and trust in public. That makes them one of the most important checkpoints in a serious on-chain development workflow. A strong audit does not only

EIP-712 Domain Separation: Pattern, When to Use It, and Common Implementation Bugs (Complete Guide) EIP-712 Domain Separation matters because typed-data signatures are only as safe as the context they are bound to. If a signature can be replayed against the wrong contract, the wrong chain, the wrong version, or a deployment you never meant to

Solana Programs vs EVM Contracts: Security Differences Builders Must Know (Complete Guide) Solana Programs vs EVM Contracts is one of the most important security comparisons a builder can make before shipping production code, because the two environments do not just use different languages or tooling. They expose different execution models, account structures, trust boundaries, failure

Circuit Breakers: Pattern, When to Use It, and Common Implementation Bugs (Complete Guide) Circuit Breakers are one of the most important defensive patterns in smart contract security because they let a protocol slow down, pause, or contain damage when something goes wrong. In practice, the pattern is simple. A contract or a group of contracts

Permit2 and Allowances: Security Deep Dive with Examples (Complete Guide) Permit2 and Allowances are central to modern token UX, but they are also one of the easiest places for silent risk to accumulate. A wallet can look clean, a dApp can feel polished, and a single signature can still create standing token permissions that outlive

Pull Payments: Pattern, When to Use It, and Common Implementation Bugs (Complete Guide) Pull Payments is one of the most practical smart contract security patterns because it changes who initiates value transfer and when that transfer happens. Instead of pushing funds to a recipient during some larger business flow, the contract records what is owed

Testing Smart Contracts: Unit Tests, Fuzzing, and Invariants Explained Testing Smart Contracts is not about chasing 100 percent coverage. It is about proving that the things users rely on never break, even when inputs get weird, transactions get reordered, and attackers intentionally look for edge cases. This guide walks through unit tests, fuzzing, and invariants