What is a BIP (Bitcoin Improvement Proposal)?
A design document for introducing new features or improvements to Bitcoin. Anyone can submit a BIP, but it must be reviewed, discussed, and accepted by the community before being implemented. BIPs are how Bitcoin evolves without a central authority.
Why It Matters
Bitcoin has no CEO or development company that unilaterally decides what changes to make. Instead, BIPs create a transparent, open-source process where any developer can propose improvements. This democratic approach protects Bitcoin's integrity and prevents any single entity from forcing unwanted changes on the network. Important Bitcoin upgrades like SegWit (BIP 141) and Taproot (BIP 340-342) went through this process, allowing the community to evaluate, debate, and reach consensus before implementation. BIPs are also numbered, creating a permanent historical record of Bitcoin's evolution. Understanding the BIP process explains why Bitcoin changes slowly and deliberately—this is a feature, not a bug, since billions of dollars ride on every protocol change.
How It Works
A BIP author writes a detailed proposal document explaining what change they're suggesting, why it's needed, and how it will work technically. The proposal is submitted to the Bitcoin development community, where experienced developers review it, ask questions, and suggest improvements. Discussion happens publicly, often on the bitcoin-dev mailing list and GitHub. If the proposal gains community support, it moves through different status categories: Draft, Proposed, Accepted, Final, Deferred, Rejected, Withdrawn, or Replaced. Some BIPs are standards-track (proposing new features), while others are informational or process-oriented. Notable examples include BIP 39 (seed phrases), BIP 32 (HD wallets), and BIP 44 (multi-account wallet structure)—proposals that shaped how most people interact with Bitcoin today.