Solidity · Foundry
UniversalDelegate on GitHub (opens in a new tab)
A singleton delegate contract for EIP-7702. Any EOA can point to it for batch calls, session keys and gas sponsorship, with no contract deployed per account.
Hi, I'm Furi.
I run blockchain nodes, build small tools for web3 developers and write step-by-step guides about the setups I run.
Most of my time goes into validators and testnet nodes on Cosmos and Ethereum networks, smart contract tooling in Solidity and TypeScript, and lately AI agents.
Selected projects
All repositories on GitHub (opens in a new tab)Node.js · Playwright · LLM
ARBITRAGE-PEDIA on GitHub (opens in a new tab)
An LLM agent that screens Tokopedia, Shopee and Bukalapak for underpriced listings, scores how well they would resell and learns from each sale.
React · TypeScript · Express
Octra Wallet on GitHub (opens in a new tab)
A minimal wallet for the Octra mainnet. Import a key or wallet.json, check the balance and send OCT, with transactions signed locally.
TypeScript
Soneium SC Debugger on GitHub (opens in a new tab)
Fetch a contract's ABI, encode calldata, estimate gas and send transactions on Soneium from one screen.
Shell · Docker
Aztec Sequencer Node on GitHub (opens in a new tab)
A one-line installer for an Aztec sequencer node, with commands to follow the logs and check the proven block height.
C · RISC-V
Thru Alphanet walkthrough on GitHub (opens in a new tab)
A complete walkthrough of the Thru testnet: the CLI, accounts, C smart contracts on RISC-V, custom tokens and domain names.
Latest guides
All guidesLatest guide11 min read
Build a small RAG pipeline with pgvector and local embeddings
You will build a small retrieval-augmented generation (RAG) pipeline in Python that stores document chunks in PostgreSQL with pgvector and uses local Ollama…
curl -fsSL https://ollama.com/install.sh | shollama -vexport PGPASSWORD="replace-with-a-local-password"pgvector/pgvector:0.8.7-pg18docker exec ragdb pg_isready -h localhost -U postgresollama pull embeddinggemma11 min read
Automate chain upgrades with Cosmovisor
Put a Cosmos Hub node under Cosmovisor v1.7.3 so it switches to the Gaia v29.0.0 binary at the governance upgrade height on its own. It is for node operators…
10 min read
Run a Cosmos Hub full node with state sync
Run a Cosmos Hub (cosmoshub-4) full node with gaiad under systemd and bootstrap it with state sync instead of replaying the chain from genesis. It is for node…
12 min read
Validator security: sentry nodes, remote signing and firewalls
Lock down a CometBFT validator so it peers only through sentry nodes, signs through a remote signer, and sits behind ufw rules, key-only SSH and offline key…
Have a node to run or a tool to build?
I take on node setups, smart contract tooling and small web3 projects. Tell me what you need and I will reply by email.