Guardrails for AI agents, with a receipt. Blocks destructive tool calls before they run and signs every decision into a hash-chained record anyone can verify with an open-source tool.
TypeScript SDK + MCP server for Tersign, the evidence layer for the agent economy — counter-signed EIP-712 receipts, hash-chained action and disclosure records, refunds, disputes, venue-ready evidence envelopes. npm: tersign
An open format for evidence someone else can check. One signed, chained, anchored file, verified offline by a free Apache-2.0 tool with no account and no server.