11 entries
The foundational BIP that defined the Bitcoin Improvement Proposal process itself, modeled after Python's PEP system. Established the framework for proposing, discussing, and implementing changes to Bitcoin, categorizing BIPs into Standards Track, Informational, and Process types.
Defined the 'bitcoin:' URI scheme for standardized payment requests. Enables clickable Bitcoin addresses and QR codes with optional parameters for amount, label, and message, forming the basis of user-friendly Bitcoin payment workflows.
Introduced hierarchical deterministic (HD) wallets, allowing an entire tree of key pairs to be derived from a single master seed. This eliminated the need for frequent backups and enabled organized key management with parent-child key derivation.
Defined the standard for generating human-readable mnemonic seed phrases (typically 12 or 24 words) from random entropy. Combined with BIP 32, this became the universal backup method for Bitcoin wallets, allowing users to recover funds by writing down a word list.
Peter Todd proposed BIP 65, introducing the OP_CHECKLOCKTIMEVERIFY opcode that allows Bitcoin transaction outputs to remain unspendable until a specified future time. The proposal redefined the existing NOP2 opcode and was deployed as a soft fork, enabling use cases including escrow with delayed access, two-factor wallets, and payment channels.
Defined a signaling mechanism for opt-in Replace-by-Fee (RBF), allowing unconfirmed transactions to be replaced by new versions with higher fees. RBF improved fee estimation and market efficiency but was controversial for its impact on zero-confirmation transaction security.
BIP 125 formalized opt-in Replace-by-Fee (RBF), allowing Bitcoin transaction senders to signal that their unconfirmed transactions may be replaced by higher-fee versions. The concept traces directly to Satoshi Nakamoto's original transaction replacement mechanism described on BitcoinTalk in December 2010 — the same thread where Peter Todd made his second-ever forum post.
Proposed Segregated Witness (SegWit), the most significant protocol upgrade since Bitcoin's creation. By separating signature data from transaction data, SegWit fixed transaction malleability, enabled the Lightning Network, increased effective block capacity, and introduced a new transaction format — all via a backward-compatible soft fork.
Introduced Schnorr digital signatures to Bitcoin, replacing ECDSA for Taproot transactions. Schnorr signatures are provably secure, non-malleable, and enable efficient multi-signature aggregation — making complex scripts indistinguishable from simple payments on-chain.
Introduced Taproot, the most significant Bitcoin protocol upgrade since SegWit. By combining Schnorr signatures (BIP 340) with Merkelized Abstract Syntax Trees (MAST), Taproot makes complex spending conditions as private and efficient as simple payments, while enabling more sophisticated smart contracts.
Proposed Pay-to-Merkle-Root (P2MR), a quantum-resistant output type for Bitcoin. P2MR operates like Taproot but removes the quantum-vulnerable key path spend, committing only to the Merkle root of a script tree. Deployed as SegWit version 2, it provides resistance against long-exposure quantum attacks while maintaining backward compatibility as a soft fork.