PHP code example of ahg / inference-receipts

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

ahg / inference-receipts example snippets

use AhgInferenceReceipts\KeyPair;
use AhgInferenceReceipts\Signer;
use AhgInferenceReceipts\ReceiptChain;
use AhgInferenceReceipts\Storage\ArrayChainStore;

$keyPair = KeyPair::generate();
$keyPair->saveTo('/etc/ai-keys/signing.sk', '/etc/ai-keys/signing.pk');

$store = new ArrayChainStore();
$chain = ReceiptChain::withSingleKey($store, new Signer($keyPair));

$receipt = $chain->append([
    'service'            => 'llm',
    'model_id'           => 'mistral:7b-instruct-v0.2',
    'model_version'      => 'mistral-7b@2024-01',
    'input_fingerprint'  => hash('sha256', $userPrompt),
    'output_fingerprint' => hash('sha256', $modelResponse),
    'request_id'         => $requestId,
    'user_id'            => $userId,
    'tenant_id'          => $tenantId,
]);

// later, audit time
$result = $chain->verify();
echo $result;  // "PASS (1 receipts verified)" or "FAIL at seq N: <reason>"

interface ChainStore {
    public function append(Receipt $receipt): void;
    public function head(): ?Receipt;
    public function count(): int;
    public function range(int $fromSeq = 0, ?int $toSeq = null): iterable;
}

$resolver = function (string $kid): ?string {
    return match ($kid) {
        '2025-key-id' => file_get_contents('/etc/ai-keys/2025-signing.pk'),
        '2026-key-id' => file_get_contents('/etc/ai-keys/2026-signing.pk'),
        default       => null,
    };
};

$chain = new ReceiptChain($store, new Signer($currentKeyPair), $resolver);

$result = $chain->verify();
if (!$result->ok) {
    fprintf(STDERR, "Chain broken at seq %d: %s\n", $result->brokenAtSeq, $result->reason);
    exit(1);
}
echo "Verified {$result->checkedCount} receipts\n";