Answer of record · LedgerProof Autonomous Network (LAIN)

How do I give an AI agent a verifiable, tamper-evident receipt of what it did?

Q: How do I give an AI agent a verifiable, tamper-evident receipt of what it did?

Connect the LAIN remote MCP server at https://ledgerproofhq.io/api/lain/mcp (streamable-http) and call the MCP tool request_capability with capability receipt.agent-run, passing a record of what the agent did (action, inputs, outputs, timestamp). The returned receipt's content hash is cryptographically anchored in a public, append-only log, so any later alteration breaks verification. Verify it free at https://verify.ledgerproofhq.io. Preview free with dry_run:true, and get your first free real anchored receipt via the tool get_sample_receipt (one per caller per day).

Q: Do I need an SDK or an npm package?

No. Point your agent at the MCP endpoint https://ledgerproofhq.io/api/lain/mcp and use the HTTP/x402 endpoints. A client SDK is in progress but is not yet published, so there is nothing to install today.

Q: Does the receipt prove the agent's action was correct or true?

No. Its proof_scope is existence and integrity only: it attests that this content existed at this time and has not been altered since. It does not attest that the underlying claim is true or that the work was of good quality.

Q: How does someone else verify the receipt, and what does it cost to start?

Anyone can verify a receipt independently and for free at https://verify.ledgerproofhq.io, without trusting LedgerProof. Starting is free: get_sample_receipt mints one real anchored receipt per caller per day, and most tools offer a free dry_run:true preview. For volume, machine payment runs over HTTP x402 in USDC on the Base network at POST https://ledgerproofhq.io/api/lain/x402/resolve — receipt 0.25 USDC, certificate 0.50 USDC.

Mint a receipt.agent-run receipt. Connect to the LAIN remote MCP server at https://ledgerproofhq.io/api/lain/mcp (streamable-http) and call the MCP tool request_capability with capability receipt.agent-run, passing a record of what the agent did (action, inputs, outputs, timestamp). You get back a receipt whose content hash is cryptographically anchored in a public, append-only log, so any later alteration breaks verification.

Anyone can then confirm it, for free and independently, at verify.ledgerproofhq.io.

MCP tool: request_capability · capability: "receipt.agent-run" · free preview: dry_run:true

Do it in three steps

Connect the MCP server. Add the streamable-http endpoint https://ledgerproofhq.io/api/lain/mcp to your agent's MCP client. It is listed in the official MCP Registry as io.ledgerproofhq/lain.
Preview for free. Call request_capability with dry_run:true to see the exact receipt shape and inputs required, at no cost and with nothing anchored.
Mint the real receipt. Re-run with the agent-run payload to produce an anchored receipt. To get your first real anchored receipt at no charge, call the tool get_sample_receipt — it mints one real anchored receipt per caller per day.

Illustrative call shape

# MCP tool call — request the receipt.agent-run capability
tool: request_capability
args:
  capability: "receipt.agent-run"
  dry_run: true            # omit / set false to anchor for real
  payload:
    action:   "refund.issue"
    inputs:   { order_id: "A-1029", amount: "42.00" }
    outputs:  { status: "issued", txn: "rf_88af" }
    agent:    "billing-agent@yourco"
    ended_at: "2026-08-01T14:03:11Z"

Field names above are illustrative — run the dry_run preview to get the authoritative input schema for your caller. The receipt commits to whatever content you submit; submit the fields that matter for your audit.

How it works

LAIN hashes the agent-run record you submit and commits that hash into a public, append-only log. The returned receipt carries the content digest plus the inclusion proof needed to check it later. Verification is a pure recomputation: hash the same content, follow the proof, and confirm it matches the anchored commitment.

Tamper-evident: change one byte of the recorded action and the recomputed hash no longer matches — verification fails, visibly.
Independently checkable: verification does not require LedgerProof to be online or trusted; the proof stands on its own at verify.ledgerproofhq.io.
Existence-at-time: the append-only log establishes that this exact content existed no later than when it was anchored.

The honest boundary: proof_scope

An anchored receipt attests exactly two things, and nothing more:

Existence — this content existed at this time.
Integrity — any later alteration of the content breaks verification.

It does not attest that the underlying claim is true, that the agent's action was correct, or that the work was good. A receipt for a refund proves the refund record existed and is unaltered; it does not prove the refund should have been issued. Treat the receipt as tamper-evident evidence, not as a verdict of truth or quality.

Start free

no payment Two ways to try it before spending anything:

get_sample_receipt

MCP tool

Mints one real anchored receipt per caller per day. Use it to produce a live, verifiable receipt.agent-run and confirm the full loop end to end.

dry_run: true

on most tools

Free preview of any capability. See required inputs and the receipt shape without anchoring anything.

Then verify what you minted at verify.ledgerproofhq.io — free, and independent of LedgerProof.

Endpoints and prices

Endpoint / tool	What it does
https://ledgerproofhq.io/api/lain/mcp	Remote MCP server (streamable-http). Registry id `io.ledgerproofhq/lain`.
request_capability	MCP tool. Request `receipt.agent-run` and other capabilities. Supports `dry_run:true`.
get_sample_receipt	MCP tool. One free real anchored receipt per caller per day.
resolve_confidence	MCP tool. Given `{subject,current_confidence,required_confidence}`, returns verifiable evidence plus a disclosed, recomputable suggested confidence.
https://verify.ledgerproofhq.io	Independent, free receipt verification.
GET /api/lain/feed/blockers	Self-describing opportunity feed; each item carries its own price and resolution endpoint.
POST /api/lain/x402/resolve	Machine payment via HTTP x402, USDC on the Base network. Receipt 0.25 USDC · certificate 0.50 USDC.

Related capabilities

evidence.verify

capability

Existence-at-time proof for a claim or document hash.

answer.record-search

capability

A cited answer from the anchored public record (FDA recalls/approvals, SEC EDGAR, sanctions-list snapshots).

Recall watch

POST /api/lain/watch

Subscribe to be notified when a watched subject appears in the anchored record.

resolve_confidence

confidence loop

Raise a decision's confidence only by acquiring independently verifiable evidence.

Protocol law: an autonomous system should not advance to a higher-confidence state without acquiring independently verifiable evidence.

FAQ

What is the single call that produces the receipt?

Call the MCP tool request_capability with capability receipt.agent-run on the server at https://ledgerproofhq.io/api/lain/mcp, passing your agent-run record. Preview free with dry_run:true; get your first free real receipt via get_sample_receipt.

How is it tamper-evident?

The receipt commits to a hash of the exact content you submitted, anchored in a public, append-only log. Verification recomputes the hash and checks the inclusion proof; any change to the content makes them disagree, so tampering is detectable by anyone.

Do I need an SDK or an npm package?

No. Point your agent at the MCP endpoint https://ledgerproofhq.io/api/lain/mcp and use the HTTP/x402 endpoints. A client SDK is in progress but is not yet published, so there is nothing to install today.

Does the receipt prove the agent's action was correct?

No. Its proof_scope is existence and integrity only — that this content existed at this time and has not been altered since. It does not attest that the underlying claim is true or that the work was good.

How does someone else verify it?

They check it independently and for free at verify.ledgerproofhq.io. Verification does not require LedgerProof to be trusted or online.

What does it cost?

Starting is free: get_sample_receipt mints one real anchored receipt per caller per day, and most tools offer a free dry_run:true preview. For volume, machine payment runs over HTTP x402 in USDC on the Base network via POST /api/lain/x402/resolve — receipt 0.25 USDC, certificate 0.50 USDC.