On-chain notarization for documents and data. Send a SHA-256 hash; receive a permanent, timestamped, independently verifiable blockchain record proving the content existed at this moment - plus a downloadable PDF Certificate of Existence. The document itself never leaves your system; only the hash is transmitted. Use for contracts, agreements, audit trails, IP protection, compliance records, and AI-output provenance. Anyone can verify a seal without trusting this service. $1.00 per seal, paid via x402 in USDC on Base.
Last updated 3m ago
On-chain USDC settlements received on Base · 0xB60a3181303953E6F909ba4d3b09282BEefCDD6B
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On-chain payment destinations for this service, with each wallet’s current USDC balance. Click an address to view it on the block explorer.