Fidacy Conversation Receipts, proof of what the bot said

Your agent talks to customers about refunds, claims, prescriptions, contracts. When a dispute comes, the question is always the same: what exactly was said, and can either side prove the transcript was not edited afterwards? This skill gives every session a tamper-evident digest, computed locally (content never leaves your infrastructure; only a 64-hex hash travels), anchored through Fidacy onto an audit chain checkpointed to the Bitcoin blockchain.

When to use this skill

Any conversation where what was said can bind someone: customer support, insurance quotes, claim intake, medical scheduling, order changes. Especially when the customer is a consumer who needs proof they can check themselves.

How to use it

1. Install: npm i @fidacy/session (free; anchoring needs a free API key from https://app.fidacy.com/signup, scope assess:write).

2. Wire the chain into your chat loop, one line per message:

   import { createSession } from "@fidacy/session";
   const session = createSession({ kind: "conversation", label: "case-4711" });
   session.add("user", userMessage);
   session.add("assistant", botReply);
   

3. Before the bot COMMITS to anything (a refund, an approved claim, a quote), gate it. Deny-by-default: anything but "approve" and the bot must refuse:

   const verdict = await session.gate(
     { type: "refund", amount: 900, currency: "USD" },
     { apiKey: process.env.FIDACY_ENGINE_API_KEY, kind: "message_send" },
   );
   if (!verdict.allowed) refusePolitely();
   

   The verdict is recorded into the chain, so the receipt itself proves the gate ran.

4. At session close, anchor and hand out the receipt:

   const receipt = await session.anchor({ apiKey: process.env.FIDACY_ENGINE_API_KEY });
   const linkForCustomer = session.verifyUrl(); // no account, no key needed
   

Anyone can check the receipt at https://fidacy.com/verify: paste the digest, a signed receipt, or the exported transcript (the digest recipe recomputes in the browser, nothing uploads). Changing one character of one message breaks the match; that mismatch is the tampering signal.

What this is not

Fidacy never sees, stores or judges conversation content. This is integrity proof plus a commitment gate, not content moderation. The bot talks freely; it cannot obligate you outside what you authorized.