SegWit (Segregated Witness)
SegWit is a Bitcoin protocol upgrade activated in August 2017 (BIP141) that separates transaction signatures from the transaction data, fixing malleab
SegWit is a Bitcoin protocol upgrade activated in August 2017 (BIP141) that separates transaction signatures from the tr...
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Sep 2026 · Freshness Score: 50%
Was ist SegWit (Segregated Witness)?
SegWit is a Bitcoin protocol upgrade activated in August 2017 (BIP141) that separates transaction signatures from the transaction data, fixing malleab
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SegWit moves signature data out of the transaction's scriptSig into a separate witness field, which doesn't count toward the block size limit (with a weight-based limit instead). This increases effective block capacity, fixes transaction ma
SegWit was a pivotal Bitcoin upgrade — it enabled Lightning Network, reduced fees during congestion, and demonstrated that soft-fork upgrades could succeed. Its legacy includes the block-size debate that led to the Bitcoin Cash fork.
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1. What Is SegWit
SegWit (Segregated Witness) is a Bitcoin protocol upgrade (2017) that separates transaction signatures (witness data) from the main transaction data, increasing block capacity and enabling second-layer solutions like Lightning.
2. How It Works
SegWit moves signature data out of the transaction's scriptSig into a separate witness field, which doesn't count toward the block size limit (with a weight-based limit instead). This increases effective block capacity, fixes transaction malleability (enabling Lightning channels), and introduced new address formats (Bech32, starting with bc1).
3. Why It Matters
SegWit was a pivotal Bitcoin upgrade — it enabled Lightning Network, reduced fees during congestion, and demonstrated that soft-fork upgrades could succeed. Its legacy includes the block-size debate that led to the Bitcoin Cash fork.
4. Key Facts
- Activated August 2017 via BIP 141 (soft fork)
- Introduced Bech32 addresses (bc1...)
- Weight-based block limit replaced size-based
- Enabled Lightning via transaction malleability fix
5. Related Concepts
- bitcoin
- lightning-network
- taproot
- soft-fork
Frequently Asked Questions
What is SegWit (Segregated Witness)?
SegWit is a Bitcoin protocol upgrade activated in August 2017 (BIP141) that separates transaction signatures from the transaction data, fixing malleab
How does SegWit (Segregated Witness) work?
SegWit (Segregated Witness) is a Bitcoin protocol upgrade (2017) that separates transaction signatures (witness data) from the main transaction data, increasing block capacity and enabling second-layer solutions like Lightning. SegWit moves signature data out of the transaction's scriptSig into a s
Why does SegWit (Segregated Witness) matter in Web3?
- lightning-network - taproot - soft-fork