BIP (Bitcoin Improvement Proposal)
A Bitcoin Improvement Proposal (BIP) is a formal document proposing changes, standards, or informational guidelines for the Bitcoin protocol. BIPs follow a structured process for community review and serve as the primary mechanism for proposing and documenting protocol improvements.
How It Works
The BIP process was modeled after Python's PEP (Python Enhancement Proposal) system and was introduced by Amir Taaki in 2011 as BIP 0001. Anyone can write a BIP, but each proposal must meet formatting standards and go through community review. BIPs are categorized into three types: Standards Track (protocol changes), Informational (design issues and guidelines), and Process (procedural changes).
Some of the most important BIPs have shaped Bitcoin's security landscape directly. BIP32 defined hierarchical deterministic wallets, enabling the derivation of unlimited keys from a single seed. BIP39 standardized mnemonic seed phrases — the 12 or 24 words that back up your wallet. BIP141 introduced Segregated Witness (SegWit). BIP174 defined PSBTs (Partially Signed Bitcoin Transactions), enabling secure multisig workflows and air-gapped signing.
Not every BIP becomes part of Bitcoin. Many proposals are discussed, debated, and ultimately rejected or abandoned. This high bar for acceptance is a strength. Bitcoin's conservative upgrade culture means changes only happen when they have overwhelming support and have been thoroughly vetted. The BIP process ensures that all proposals are documented, publicly reviewed, and technically sound before consideration.
Key Points
- Formal process for proposing and documenting Bitcoin protocol changes
- Three types: Standards Track, Informational, and Process
- Key BIPs include BIP32 (HD wallets), BIP39 (seed phrases), BIP141 (SegWit)
- Anyone can write a BIP, but acceptance requires extensive community review
- Bitcoin's conservative culture means most BIPs do not become protocol changes