According to github bitcoin/bips, BIP-173 is still a draft. And i saw today that Electrum wallet start using it.

Is this means that the specs for BIP-173 won't change in the future ? or the final version won't introduce breaking changes to the draft version ?

I just learned about Bech32 addresses this week and this gets me a little confused


Yes, they are. Bech32 addresses allow for native Segwit outputs, which offer higher efficiency and security than the legacy P2SH nested Segwit outputs. https://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki#Reference_implementations has reference implementations in C, C++, JS, Go, Python, Haskell, Ruby, and Rust along with tests courteous of Pieter Wuille


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