PHP code example of fissible / attest

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

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

    

fissible / attest example snippets

use Fissible\Attest\Chain\EvidenceChain;
use Fissible\Attest\Chain\FileChainStore;
use Fissible\Attest\Signing\KeyPair;
use Fissible\Attest\Signing\SodiumSigner;

// Your app's signing identity ("this entry really came from us").
$keys   = KeyPair::generate();   // save these; the public key is needed to verify later
$signer = new SodiumSigner($keys, keyId: 'station-prod-2026-01');

// Where the chain is stored, and which chain we're writing to.
$store = new FileChainStore(__DIR__ . '/storage/attest');
$chain = EvidenceChain::open($store, 'contracts', $signer);

// Record an event.
$chain->record('contract.approved', [
    'contract_id' => 'C-2026-014',
    'approved_by' => 'user:7',
    'amount'      => 50_000,
]);

use Fissible\Attest\Verification\SignatureVerifier;
use Fissible\Attest\Verification\TrustedKey;
use Fissible\Attest\Verification\Verifier;

$verifier = new Verifier(
    store: $store,
    signatures: new SignatureVerifier([
        new TrustedKey($keys->publicKey, keyId: 'station-prod-2026-01'),
    ]),
);

$result = $verifier->verifyChain('contracts');

$result->isVerified();   // true only if every entry is signed by a trusted key
                         // and nothing was altered, inserted, or deleted.

use Fissible\Attest\Chain\ChainStore;
use Fissible\Attest\Testing\ChainStoreContractTests;
use PHPUnit\Framework\TestCase;

final class MyChainStoreTest extends TestCase
{
    use ChainStoreContractTests;

    protected function makeStore(): ChainStore
    {
        return new MyChainStore();
    }
}

use Fissible\Attest\Anchor\AnchorOutcome;
use Fissible\Attest\Anchor\OpenTimestamps\OpenTimestampsCalendarClient;
use Fissible\Attest\Anchor\OpenTimestampsDriver;
use Fissible\Attest\Chain\FileChainStore;
use Fissible\Attest\Headers\BitcoinCoreRpcHeaderProvider;
use Fissible\Attest\Headers\HeaderProviderSet;
use Fissible\Attest\Verification\SignatureVerifier;
use Fissible\Attest\Verification\TrustedKey;
use Fissible\Attest\Verification\VerificationPolicy;
use Fissible\Attest\Verification\Verifier;
use GuzzleHttp\Client;
use GuzzleHttp\Psr7\HttpFactory;

$store = new FileChainStore(__DIR__ . '/storage/attest');
$http = new Client();
$factory = new HttpFactory();

$verifier = new Verifier(
    store: $store,
    signatures: new SignatureVerifier([
        new TrustedKey($rawEd25519PublicKey, keyId: 'station-prod-2026-01'),
    ]),
    policy: new VerificationPolicy(
        minAnchorOutcome: AnchorOutcome::BITCOIN_VERIFIED,
    ),
    anchorDrivers: [
        new OpenTimestampsDriver(OpenTimestampsCalendarClient::withGuzzle()),
    ],
    headers: new HeaderProviderSet(
        new BitcoinCoreRpcHeaderProvider(
            http: $http,
            requests: $factory,
            streams: $factory,
            rpcUrl: 'http://127.0.0.1:8332',
            cookieFile: '/var/lib/bitcoin/.bitcoin/.cookie',
        ),
    ),
);

$result = $verifier->verifyChain('tenant:5', fromSeq: 1, toSeq: 1000);

use Fissible\Attest\Envelope\Binary;

$chain->record('cms.attachment.added', [
    'name' => 'spec.pdf',
    'sha256' => 'abc...',
    'blob' => Binary::ofRaw(file_get_contents('/tmp/spec.pdf')),
]);