Prove you made it first. Timestamp your creative work on the blockchain via Claude or any MCP-enabled AI agent.
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First seen 2 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
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| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Claude | spArxx.io | Zero-Knowledge Blockchain Timestamping | partner | 9 Oct 2026 |
| Official MCP Registry | spArxx.io | - | 2 Oct 2026 |