Issue #3308038 by casey: Use a loop instead of asserting a single timestamp entity

  public function updateBlockchainInfo(string $remote_id, string $address, string $blockchain, string $transactionId, string $transactionLink) {

    /** @var \Drupal\wordproof\Entity\Timestamp $entity */

    $entities = $this->entityTypeManager->getStorage('wordproof_timestamp')->loadByProperties(['remote_id' => (int) $remote_id]);

    $entity = array_shift($entities);

    foreach ($entities as $entity) {

      $entity->setTransactionAddress($address);

      $entity->setTransactionBlockchain($blockchain);

      $entity->setTransactionId($transactionId);

      $entity->setTransactionLink($transactionLink);

      $entity->save();

    }

  }

}