Certified Bitcoin Professional Practice Exam

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What happens if 99% of Bitcoin nodes are destroyed?

The network collapses immediately
The network will survive with just one full node
Transactions will be halted
New nodes cannot be created

The correct answer is: The network will survive with just one full node

If 99% of Bitcoin nodes are destroyed, the network could potentially survive with just one full node due to the distributed nature of blockchain technology. Bitcoin operates on a decentralized model where each node maintains a copy of the entire blockchain. This means that even if most nodes go offline, the blockchain’s integrity can still be preserved if at least one full node continues to exist. The remaining full node can continue to accept transactions, broadcast them to other peers, and validate the existing transactions based on the historical record it holds. The key point is that the blockchain itself remains intact as long as there is at least one node that retains a copy of the blockchain ledger. While other options suggest immediate collapse or halting of transactions, those scenarios fail to account for the resilience of the decentralized network. Bitcoin's design inherently allows it to withstand the loss of a significant percentage of nodes, as long as there are nodes remaining that can continue the operation and provide consensus. The ability to create new nodes would also remain since any new user can download the blockchain and begin to participate in the network, albeit under conditions where there is connectivity and an initial ledger available.