"Bitcoin Cash" matching MCP servers:

Third-party auditor for Japanese construction & renovation estimates. Checks a quoted price against curated fair-price data, flags overcharge and sales tactics, and returns a Bitcoin-anchored, independently verifiable signed receipt (PTKA) - proof you can recompute, not just an opinion. Remote MCP, no auth. Works with Claude, ChatGPT, Gemini, Perplexity.