8. Protocol Upgrades: Soft Forks (SegWit, Taproot) vs Hard Forks
Part of Chapter 01: Bitcoin Architecture & Satoshi Consensus Foundations
- Soft Forks: Backward-compatible rule tightening
- Hard Forks: Non-backward-compatible chain splits
- SegWit (BIP 141) discount and Taproot (Schnorr signatures) efficiency
A Hard Fork introduces rules that older nodes consider invalid, splitting the chain permanently unless 100% of the network upgrades (e.g. the 2017 Bitcoin vs Bitcoin Cash blocksize war).
A Soft Fork tightens rules in a backward-compatible manner. Un-upgraded nodes still validate blocks as legal, avoiding catastrophic network splits.
Major historical soft forks include Segregated Witness (SegWit) in 2017, which separated signature data to effectively increase block capacity and fix transaction malleability, and Taproot in 2021, which introduced Schnorr signatures for enhanced privacy and batch verification.
Always use native SegWit (bech32 starting with 'bc1q') or Taproot ('bc1p') addresses. They reduce transaction weight by up to 38%, directly slashing your mining fees.
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All Lessons in Chapter 01
Bitcoin Architecture & Satoshi Consensus Foundations (10 Lessons)