Kkavin-kim-creatorinkavinkimcreator.hashnode.devWhy USDC on Base? The Technical Choices Behind Rosud's Payment StackWhen we decided to build Rosud — an infrastructure layer that lets AI agents send and receive payments autonomously — the hardest question was not "should AI agents pay?" It was "pay with what, and on which chain?" This post explains the three decisi...48m ago·3 min read
Oohmygodindreamworksecurity.hashnode.devAnatomy of the CrossCurve Bridge Hack: How a Missing Access Control in Axelar expressExecute Drained $3MCross-chain bridges remain DeFi's most dangerous attack surface. On February 1, 2026, CrossCurve (formerly EYWA) lost an estimated $3 million across Ethereum and Arbitrum — not because of a novel zero-day, but because of a textbook access control ove...6h ago·7 min read
Oohmygodindreamworksecurity.hashnode.devWriting Custom Semgrep Rules to Catch Solana Anchor Vulnerabilities Before Auditors DoWriting Custom Semgrep Rules to Catch Solana Anchor Vulnerabilities Before Auditors Do You've written your Anchor program. It compiles. Tests pass. You're ready to deploy. But buried in your instruction handlers are patterns that every experienced au...8h ago·6 min read
Oohmygodindreamworksecurity.hashnode.devDissecting the $1.5B Bybit Hack: How a Supply Chain Attack + delegatecall Hijacked History's Biggest Crypto HeistOn February 21, 2025, Bybit lost approximately $1.5 billion in ETH and staked ETH tokens — the single largest cryptocurrency theft in history, nearly triple the previous record. The attack wasn't a smart contract bug. It wasn't a flash loan exploit. ...9h ago·5 min read
MDMeta Dev Digitalinmetadevdigital.hashnode.devThe Anatomy of a Smart Contract Audit: What Auditors Look ForThe Anatomy of a Smart Contract Audit: What Auditors Look For In November 2022, a single integer overflow bug in Wormhole's token bridge drained $325 million in wrapped Ethereum.[^1] The code was audited twice. The vulnerability existed in plain sig...16h ago·5 min read
TOTemitope Olamiposi Lawalinblanck.hashnode.devDesigning Payments for Autonomous Agent: View on x8004When you hear the word "agent," what first comes to your mind? Do you know that Agents are starting to buy things for us? They can subscribe to APIs, negotiate data access, and settle tiny invoices in1d ago·7 min read
MDMeta Dev Digitalinmetadevdigital.hashnode.devMEV (Maximal Extractable Value): What It Is and Why It MattersMEV (Maximal Extractable Value): What It Is and Why It Matters When I first deployed a liquidity pool contract on Mainnet, I watched a $50k swap get sandwiched in the same block and couldn't figure out where the slippage went. Took me way too long t...3d ago·4 min read
Aadaminrustarians.hashnode.dev10 Questions from a ZK Meetup in KrakowOriginal version with full formatting on rustarians.com. I gave a talk about halo2 at a Rust meetup in Krakow. The audience asked 10 questions I didn't have time to answer properly on stage, so I wro2d ago·11 min read
UBUp2itnow Bill Wilsoninai-agent-economy.hashnode.devThe Definitive Guide to x402 Payments with agent-wallet-sdkYour AI agent needs to pay for an API call. Not tomorrow. Right now, mid-execution, without a human clicking "approve." That's the problem x402 solves. What x402 Actually Is x402 is an open payment protocol built on HTTP status code 402 (Payment Requ...3d ago·5 min read
UBUp2itnow Bill Wilsoninai-agent-economy.hashnode.devTaskBridge Escrow: How AI Agents Will Pay Each Other for WorkAI disclosure: This article was drafted by Max, an AI COO agent at AgentNexus. The architecture described here is real and being built. TaskBridge Escrow: How AI Agents Will Pay Each Other for Work AI agents are about to hire each other at scale. On...6d ago·4 min read
