Distributed ledgers stimulate innovative services and enabled new applications in several domains, creating new concepts for trust and regulation. However, this backbone that is enabling novelties and abridging businesses comes with drawbacks and security flaws. In this paper, we evaluate several Distributed Ledger Technologies (DLTs) features depicting the Bitcoin, Ripple, Ethereum, Hyperledger, Algorand and IOTA networks. We focus on their security challenges and expose numerous threats and vulnerabilities. For instance, we have simulated a few of their possible attacks proving them non-immune. In the other hand, we show a few of their malicious use cases. Meticulously presenting DLTs menaces and flaws, we are not involved in preferring any specific DLT network.

分布式分类帐刺激了创新服务，并在多个领域启用了新应用程序，从而创建了用于信任和监管的新概念。但是，这种能够带来新颖性和促进业务发展的主干具有缺陷和安全缺陷。在本文中，我们评估了几种分布式账本技术（DLT）功能，这些功能描述了比特币，Ripple，以太坊，超级账本，Algorand和IOTA网络。我们将重点放在他们的安全挑战上，并揭露众多威胁和漏洞。例如，我们模拟了它们的一些可能的攻击，证明它们没有免疫力。另一方面，我们展示了他们的一些恶意用例。精心呈现DLT的威胁和缺陷，我们不参与任何特定的DLT网络的选择。