@alexar76/awr-emit

Emit a signed AWR/2 WorkReceipt from Node. Zero runtime dependencies — the RFC 8785 canonicalizer, base58btc, did:key derivation and the Ed25519 signing all sit in one file over node:crypto.

There are two sides to AWR and they need different code. A verifier reads a receipt and checks it. An emitter writes one: it takes what your system just did and signs a document saying so. This is an emitter, and it verifies nothing — deliberately, because a component that both issues and judges its own work is not evidence of anything.

npm install @alexar76/awr-emit

import { emitReceipt, generateKey, jcsPayload } from '@alexar76/awr-emit';

const key = generateKey();              // keep this; its .did is your issuer identity

const receipt = emitReceipt({
  key,
  modelId: 'claude-opus-5@anthropic',
  inputPayload: jcsPayload({ prompt: 'summarise this', n: 3 }),
  outputPayload: '...the model\'s answer...',
  latencyMs: 2340,
});

receipt is a plain object, ready for JSON.stringify. Anyone can check it without this package and without trusting you:

pip install awr
python -m awr verify receipt.json

MCP tool calls

./mcp wraps an MCP tool handler so every call it serves produces a receipt — including the calls that fail, because an unverifiable failure is what a dispute usually turns on.

import { withAwrReceipts } from '@alexar76/awr-emit/mcp';

const handler = withAwrReceipts(myToolHandler, {
  key,
  modelId: 'my-server@v1',
  onReceipt: (doc, err) => save(doc),   // required: a receipt nobody keeps is not evidence
});

Cross-implementation agreement

The Python emitter and this one produce byte-identical documents for the same inputs and key. That is not a claim, it is a test: test_the_typescript_emitter_agrees_byte_for_byte runs Node from pytest and compares the bytes, and the timestamp-derivation rules are pinned on both sides after a real divergence was found by diffing partial inputs.

The format itself has three independent verifiers — Python, Rust and browser JavaScript — that agree on 354 conformance cases, and an unmodified off-the-shelf W3C VC library verifies these documents given nothing but a did:key resolver.

Links

• Specification: https://github.com/alexar76/aicom/blob/main/awr/SPEC.md
• Paste a receipt into a browser verifier: https://verify.modelmarket.dev
• Verifier package for Python: https://pypi.org/project/awr/

MIT.