Denial of Service (DoS) Attack

A denial of service attack, or DoS attack, attempts to make a computer system unavailable to legitimate users by flooding it with traffic or exploiting flaws that consume its resources. A distributed version, called a DDoS attack, uses thousands of machines at once, and the largest recorded attacks have exceeded several terabits per second of traffic.

Why it matters

Any system that promises constant availability is a DoS target, and financial infrastructure is a favorite. Exchanges have been knocked offline during volatile trading, and attackers sometimes pair outages with extortion demands. For a monetary network, downtime is not an inconvenience, it is a failure of the core product.

Bitcoin was engineered with DoS resistance in mind. Transactions must pay fees and meet minimum relay rules, which makes spamming the network expensive by design. Nodes ban peers that misbehave, and because tens of thousands of independent nodes carry the ledger, there is no central server whose failure can halt the system. The network has operated essentially without downtime since 2013.

In the gold vs bitcoin debate

Gold cannot be taken offline, which is a genuine advantage of a physical asset. But gold's trading and settlement layers, the exchanges, vaults, and payment rails, run on the same attackable infrastructure as everything else. Bitcoin's answer is redundancy: attack one node and thousands of others continue validating, a resilience model closer to the internet itself than to any single institution.