AAleksei Nazarov3h ago · 5 min readMigrating off OpenZeppelin Defender Monitor: what replaces each kind of monitorOpenZeppelin closed new Defender sign-ups on June 30, 2025 and retired the hosted service on July 1, 2026. If your contracts were watched by Defender Monitor, those alerts have stopped. The service issmartalert.hashnode.dev
Aawa5h ago · 2 min readFlash-loanable voting power: the one-line function behind the X100 drainfunction _stakeOf(address account) internal view override returns (uint256) { return frozenOf(account); } That is how X100's Freezer decided who sat on its 3-seat Senate: whoever had the most X fsandaawa.hashnode.dev
SSven Esser1d ago · 10 min readBefore You Snipe: Vetting Uniswap Launches with On-Chain VerdictsOf the 8,304 pools that opened on Uniswap (Ethereum) in the last two weeks, 1,531 are already a confirmed rug pull or dump, and 79% stopped trading within a day. Half of all launches were dead inside sv3n.hashnode.dev
CColton Scott2d ago · 10 min readBCP Exam Prep: Build One Private Besu Network That Covers All Seven DomainsYou can read about Besu for weeks and still freeze on a BCP question that asks why a new node can't join the network. The fastest way to prepare for the Besu Certified Professional (BCP) exam is to buvmexam.hashnode.dev
WWaseem Anjum2d ago · 11 min readSign-In with Ethereum in Next.js 16: SIWE with viem, iron-session and a Replay-Proof Nonce (Tested)Sign-In with Ethereum (SIWE) lets a user log in by signing a plain-text message with their wallet, as defined in EIP-4361. In Next.js you need three pieces: a route that issues a nonce, a route that vfabwaseem.hashnode.dev
AAleksei Nazarov3d ago · 7 min readSmart contract monitoring in 5 minutes: what to watch and how to set it upA contract goes live after an audit. The audit checked the code on one day. From then on, the contract changes owner, gets upgraded, moves money and talks to bots, and somebody has to notice when one smartalert.hashnode.dev
MMerunas Grincalaitis4d ago · 6 min readEthereum Compromised Wallet & EIP-7702 Sweeper Rescue Handbook (2026 Reference)When an Ethereum private key or seed phrase leaks, automated sweeper bots monitor the address and drain any incoming ETH within milliseconds—long before you can broadcast a standard transfer or revokemevdao.hashnode.dev
SSven Esser4d ago · 10 min readTwo Ethereum Scam Schemes ExposedTwo Ethereum Scam Schemes Exposed I build DexMarketCap, a DEX analytics tool with a wallet tracker. The part that matters for this story is how the PnL works: instead of computing a wallet's profit whsv3n.hashnode.dev
AAleksei Nazarov5d ago · 8 min readRonin Bridge, August 2024: the vote threshold was 0 for 48 minutes before the first withdrawal, and no event said soOn August 6, 2024 the Ronin team upgraded its bridge on Ethereum. 48 minutes later an MEV bot withdrew about 4,000 ETH from it, and half an hour after that another address took 2M USDC. In total aboutsmartalert.hashnode.dev
SSven Esser6d ago · 5 min readBuild an Ethereum Wallet PnL Tracker in Node.js (20 minutes, no dependencies)Want to know whether a wallet is actually profitable? Most explorers show balances, but not profit and loss per token. In this tutorial you'll build a small Node.js script that takes any Ethereum wall12Nsv3n.hashnode.dev
