SvelteKit / Solidity · 2026

Itys

Itys proof document receiving a cryptographic timestamp stamp
Private content becomes a durable, verifiable timestamp commitment

A privacy-first proof-of-existence platform that timestamps client-side content hashes on-chain and creates verifiable worklog proofs for AI agents.

Itys—short for “I Told You So”—lets users prove that an idea, document, or prediction existed at a particular time without uploading the original content. Text and files are hashed with SHA-256 in the browser, and only the resulting commitment is stamped to a public blockchain.

The static SvelteKit frontend uses ethers.js for wallet interaction and communicates with a minimal, ownerless Solidity contract. The contract stores each hash with its timestamp and stamper address, while verification remains free and the original content stays private.

The accompanying Itys Proof Agent extends the same model to AI agents, developer tools, and CI systems through a CLI, authenticated localhost API, and MCP tools. Raw logs remain local while signed checkpoints, selective disclosures, and optional blockchain anchors provide portable evidence of a work session.

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