Inference Receipts

pnpm add @peac/adapter-openai-compatible

import { fromChatCompletion } from '@peac/adapter-openai-compatible';
import { issue } from '@peac/protocol';

// Chat completion response (OpenAI-compatible format)
const completion = {
  id: 'chatcmpl-abc123',
  model: 'gpt-4o',
  choices: [{
    index: 0,
    message: { role: 'assistant', content: 'The answer is 42.' },
    finish_reason: 'stop',
  }],
  usage: {
    prompt_tokens: 25,
    completion_tokens: 8,
    total_tokens: 33,
  },
};

const messages = [
  { role: 'user', content: 'What is the meaning of life?' },
];

// Map to interaction evidence (hash-first)
const evidence = await fromChatCompletion({
  messages,
  completion,
  platform: 'openai',
});

// evidence.input.digest  = 'sha256:a1b2c3...'
// evidence.output.digest = 'sha256:d4e5f6...'
// evidence.executor      = { platform: 'openai', model: 'gpt-4o' }
// evidence.extensions    = { model_id: 'gpt-4o', token_counts: {...}, finish_reason: 'stop' }

// Issue a signed receipt with the evidence
const receipt = await issue({
  iss: 'https://inference.example.com',
  aud: 'agent.consumer.com',
  evidence,
});

import { hashMessages, hashOutput } from '@peac/adapter-openai-compatible';

const inputDigest = await hashMessages(originalMessages);
const outputDigest = await hashOutput(completion);

// Compare against the digests in the receipt
if (inputDigest !== receipt.evidence.input.digest) {
  throw new Error('Input digest mismatch');
}
if (outputDigest !== receipt.evidence.output.digest) {
  throw new Error('Output digest mismatch');
}