There is a flaw in Bitcoin's source code that, if not fixed in time, could lead to an infinite increase in BTC supply over millennia. This is completely contrary to the absolute scarcity principle that Satoshi Nakamoto designed. But fortunately, a bug-fix proposal in 2014 prevented a potential crisis 240 years from now.
Satoshi's Mistake Could Lead to Bitcoin Losing Its Core Value
Bitcoin is built on the mechanism #Halving —meaning that every 210,000 blocks, the block reward halves, until the total supply reaches a maximum of 21 million BTC by 2140. This principle helps Bitcoin maintain its scarcity and long-term value.
But in 2014, Bitcoin Core contributor Pieter Wuille discovered a serious flaw in the way the system calculated block rewards.
🔹 When the block height exceeds a certain level, Bitcoin will not be able to correctly handle the halving rule.
🔹 This could lead to a terrible consequence: the block reward reverting back to the original level of 50 BTC, instead of continuing to decrease.
🔹 If not fixed, this bug will recur every 250 years, creating a cycle that$BTC could be exploited infinitely—a scenario completely contrary to the principles of Bitcoin.
BIP-42: Saving Bitcoin from the Scenario of 126 Million BTC
On April 1, 2014, Pieter Wuille proposed BIP-42—a patch to prevent this bug.
📌 BIP-42 ensures that Bitcoin maintains a maximum supply of 21 million BTC, rather than resetting the block reward after a certain period.
📌 Without#BIP42 , Bitcoin could have up to 126 million BTC in the coming millennia, instead of stopping at 21 million.
📌 This bug is very hard to notice, as it only occurs around the year 2265—over a century after the last BTC block is mined.
This proposal is crucial for Bitcoin's scarcity, as if the supply were to be expanded infinitely, BTC could lose its "digital gold" characteristic.
Lessons From History: Is Bitcoin Really "Immutable"?
BIP-42 shows that even Bitcoin needs intervention to stay true to the original vision. However, this raises a big question:
❓ Is BIP-42 really a bug fix or is it a regulatory change?
📌 If considered under the law, BIP-42 can be seen as a bug fix because it helps#bitcoin maintain the commitment to a fixed supply.
📌 But from the perspective of software governance, this can be seen as an interference with a pre-existing rule.
This is particularly controversial when compared to the debate about Bitcoin's block size.
🔹 Satoshi Nakamoto once said that block size should be upgraded over time, but that has not happened.
🔹 In contrast, with the supply bug, the Bitcoin community decided to fix the bug immediately, rather than leave it as is.
So what is the limit of "immutability" in Bitcoin?
Conclusion: A Small Mistake, A Big Consequence
🚀 Without BIP-42, Bitcoin could have lost its scarcity and core value.
⏳ Satoshi's mistake could have been overlooked for over 200 years, but when it happens, the consequences will be extremely severe.
💡 BIP-42 "saved" Bitcoin from a potential supply crisis in 2265.
Looking back, this is one of the most important decisions in Bitcoin's history—a testament that a small mistake can change the entire future. 🚨