What we do
Smart contracts, wallets and ledgers with a job to do.
5Swim has worked with blockchain since the Hyperledger days — supply-chain and membership networks on Sawtooth and Fabric — and today mostly on Ethereum and its ecosystem: Solidity contracts tested with Foundry and Hardhat, wallet connection tooling, indexers and the web and mobile front-ends that make them usable.
We favour small, auditable pieces over grand protocols: a contract that does one thing well, documented honestly about what it is not.
A small, inheritable Solidity mixin for on-chain endorsements: the owner requests an endorsement from a known address, which can grant or later revoke it, at contract level or per identifier. Built with Foundry; deliberately a utility rather than a reputation protocol.
View on GitHubBlockchain-backed wills: a PDF is hashed in the browser, pinned to IPFS and committed on-chain in a registry contract; beneficiaries, witnesses and executors acknowledge or reject, and every amendment is versioned. Zero-knowledge verification is on the roadmap.
A lightweight, framework-agnostic web3 connector: EIP-1193 wallet connection with RxJS observables, auto-reconnection and persistent sessions, with a React package and examples for vanilla JavaScript and Svelte.
View on GitHubA location-based on-chain game with its own economy: a treasury, a burnable resource token, governable fees behind a timelock, an indexer and API, a marketplace, a mobile app and Noir zero-knowledge circuits.
Earlier permissioned-ledger work: a high-value-item supply-chain tracker on Hyperledger Sawtooth and a golf handicap network on Hyperledger Fabric.
Agents, vision and machine learning, built into real products.
Putting the same tools to work on environmental problems.
Ideas we build to find out whether they hold.
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