JJJeffrey Jorgenseninjeffreyjorgensen.hashnode.dev·17h ago · 18 min readFalsehoods engineers believe about moving moneyA penny I sent myself switched off the balance check. The coins went out to the network; nothing was debited. It wasn't a typo and it wasn't a missing check. It was a sentence I believed: an idempoten00
Aadmininswiftnodes.hashnode.dev·16h ago · 10 min readNeutron RPC: A Developer's Guide (neutron-1, CometBFT 0.38, No eth_*)Neutron is not an EVM chain, and the RPC reflects that: there is no eth_* surface at all, no numeric chain ID, and the request shape is CometBFT JSON-RPC rather than the Ethereum method set. None of t00
ERErik Rekolainturva.dev·17h ago · 5 min readFive rounds before the agent signed anythingThe run was made on 15 September 2026 and the project is called Mandate Desk. An owner sets transfer caps, reviews the agent's exact plan, approves it for a limited window and can revoke the mandate. 00
DNDmytro Nasyrovinpharos-production.hashnode.dev·21h ago · 18 min readReconstruct a Smart Contract Deployment from On-Chain EvidenceA contract address is the start of a deployment investigation. To reconstruct what happened, connect that address to its creation transaction, the initialization code that executed, the runtime code i00
MMMushegh Manukyaninarmcp-field-notes.hashnode.dev·1d ago · 6 min readSeven Reliability Checks for Crypto Market Data ProductsA crypto interface can show a price in one line, but that number is the end of a long chain of decisions: which venue was queried, how assets were matched, when the observation was made, what happened00
Aadmininswiftnodes.hashnode.dev·1d ago · 12 min readArbitrum RPC: A Developer's Guide (Chain ID 42161, ~250ms Blocks, Fake Gas Limit)Arbitrum One is the rollup most Ethereum code runs on unmodified, and that is exactly the problem: it does run, right up until a number stops meaning what your code assumes it means. The block gas lim00
DMDora Mileninkripto-pocetnica.hashnode.dev·2d ago · 28 min readLitecoin: šta je LTC, kako radi i da li zaista ima praktičnu vrednost?Gotovo svako ko se makar kratko interesovao za kriptovalute čuo je za Litecoin. Njegova oznaka je LTC, često ga nazivaju „digitalnim srebrom“, a najčešće se opisuje kao brža i jeftinija alternativa Bi00
Aadmininswiftnodes.hashnode.dev·2d ago · 13 min readEthereum Classic RPC: A Developer's Guide (Chain ID 61, No EIP-1559)Ethereum Classic is the awkward one in the EVM family. It isn't a rollup, isn't a sidechain, and didn't fork off Ethereum's design — it is the original Ethereum chain, continuing the history that the 00
Aadmininswiftnodes.hashnode.dev·3d ago · 9 min readGnosis Chain RPC: A Developer's Guide to the Community-Owned EVM ChainIf you're building on Gnosis Chain, everything you know about Ethereum applies. It's EVM-compatible, uses the same tooling, and supports the same RPC methods. The differences are in the economics (sta00
AAntoniointonymoon.hashnode.dev·4d ago · 2 min readFreelanceFlovv Micro-Tasks Marketplace Inside World AppFor the last few weeks I've been heads-down building FreelanceFlovv, a freelance marketplace Mini App that lives entirely inside World App. No separate sign-up flow, no email/password, no "prove you'r00
