The network was down for a couple of hours in 2010 following a bug that triggered the development of 184 million BTC. I describe it in information in “8 Unknown Facts About Bitcoin“:
“1. A bug created 184 million BTC in 2010
Newcomers to the world of cryptocurrencies probably don’t know this, but on August 15, 2010, a bug in the Bitcoin Blockchain created over 184 million BTC!
Known as the “Value overflow incident”, this bug concerned block 74,638 of the Bitcoin Blockchain. Within it, a transaction was present creating 184,467,440,737.09551616 BTC for 3 different addresses. Thus, 2 addresses each received 92.2 million BTC while the miner solving the puzzle related to the block was rewarded with 0.01 BTC that did not exist before the transaction.
This bug was made possible by the fact that the code used by the Bitcoin Blockchain to verify transactions before including them in a block did not take into account the case of amounts so large that they exceeded the limit of the number of Bitcoins when added together.
A new corrective version of the Bitcoin Blockchain was released by Satoshi Nakamoto and another developer in just 5 hours after the bug was discovered. The blockchain then had to be forked to reject the offending block. While several unpatched nodes continued to add blocks to the bad version of the blockchain, the good version of the Bitcoin blockchain took over from block 74,691.
From that block on, all nodes accepted the patched version of the Bitcoin Blockchain as the authoritative one for transaction history. Thus, block 74,638 no longer exists for users using the longer blockchain as a reference.”
The most extraordinary thing here is the speed with which Satoshi Nakamoto and the other designer had the ability to repair this bug to get the network working once again.