Upgrading the Bitcoin protocol
summary
Permissionless upgrades require miner coordination because thousands of nodes (~10,000) cannot be ceased and forced to restart; incompatible rule changes cause permanent splits, while soft fork changes succeed if miners controlling hashpower enforce them. Transaction-level transaction malleability breaks off-chain chains of spends and prevents payment channels. The deployed solution moves signatures out of the transaction ID (SegWit), implemented as a backwards‑compatible soft fork via miner signaling, fixing malleability and enabling payment channels while slightly increasing effective block capacity.
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chapters (12)
- 0:00Intro
- 1:25Consensus: agreeing on a global state
- 5:00Example of bitcoin upgrades
- 5:38Backward compatibility - 2
- 7:57Backward compatibility - SCENARIO #3
- 11:48Example of a SOFT FORK - 3
- 15:06Possible attack: TRANSACTION MALLEABILITY
- 17:43SOLUTION: Off-chain transactions
- 19:43BREAKING LAYER 2
- 20:43SOLUTION: Segregated Witness
- 22:18Transactions before SegWit
- 24:36Additional advantage: soft fork block size increase
