stampthisfile for ChatGPT

io.github.stampthisfile/mcp

Timestamp files in Bitcoin (OpenTimestamps): send a hash, pay per hash with x402, get a proof.

client:ChatGPT transport:streamable-http tools:4

Install stampthisfile in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://stampthisfile.com/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs