Internally nothing changes; what users now know as 1 BTC would display as 100,000,000 bitcoins, while wallets could offer a legacy toggle for backwards compatibility.
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Bitcoin May Kill The Satoshi: Jack Dorsey Sparks Controversy
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Bitcoin Improvement Proposal 177 has sparked a global debate on Bitcoin’s user experience and financial education, though the technical protocol of Bitcoin would remain unchanged if the proposal is adopted.
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