SmitheryListed

spArxx.io | Zero-Knowledge Blockchain Timestamping

**Built for human creators** - Register a timestamp on Polygon proving you made something, the moment you did. Your file is **never uploaded, watermarked, or altered**: only its cryptographic fingerprint ever reaches spArxx.io, zero-knowledge by design. What comes back is a timestamp: your independently verifiable record of having registered it first. Built on MCP (the same open standard Claude and other AI assistants use for secure, authenticated tool access), the spArxx.io server lets your AI register timestamps, check your balance, retrieve receipts, and verify blockchain anchors, mid-conversation, no app-switching. Every timestamp anchors to the **Polygon blockchain**, independently verifiable forever after ... no trust in spArxx.io required beyond the public chain itself. spArxx.io is built for human creators, and that shows up in how it's provisioned ... not just in its purpose: connecting via MCP gets your AI access to the tools, but **a human still provisions the account** behind it. That's a deliberate choice, not unfinished friction. Minimal human involvement is required, but not zero ... that's what keeps the registration meaningful. **At a glance:** - **Chain:** Polygon - **Privacy:** Zero-knowledge. Your file's contents never reach spArxx.io, only its cryptographic fingerprint does - **Cost:** 20 spArks (~$0.20) per agentic timestamp (the lowest rate on the platform). - **Access:** OAuth, human-provisioned account required

First seen 2 Oct 2026. Evidence as of 5 Oct 2026.