- One time, a set of trustworthy devs spin their magic and build a Virtual Cryptographic CPU and then promise to never share the spell they used (and cast a forgetting charm to never remember)
- Now, all Bitcoin Script upgrades are built as programs that run on the CPU, and they are all just single ECDSA signatures on chain
- Developers build all sorts of script upgrades, like rollups, zcash, uniswap, etc
- Bitcoin almost never has to soft fork again
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