Blocks
Block structure changes. 14 proposals.
- BIP 30: Duplicate transactions: Deployed. Added a rule forbidding a block from including a transaction with the same ID as an earlier one whose outputs are not fully spent. Such duplicates can overwrite earlier coins and make them…
- BIP 34: Block v2, Height in Coinbase: Deployed. Upgraded blocks to version 2 and required each block's coinbase transaction (the one paying the miner) to include the block's height. This makes every coinbase unique, preventing duplicate…
- BIP 50: March 2013 Chain Fork Post-Mortem: Deployed. A post-mortem of the March 2013 incident in which a database limit in older Bitcoin software caused the blockchain to split temporarily. It explains what went wrong, how miners and developers…
- BIP 66: Strict DER signatures: Deployed. Required all signatures to follow one strict encoding format, known as DER. Different software interpreted loosely encoded signatures differently, which risked splitting the network and let…
- BIP 91: Reduced threshold Segwit MASF: Deployed. Proposed a way to activate SegWit with support from a simple majority of mining power instead of the 95 percent originally required. Participating miners would reject blocks that did not signal for…
- BIP 100: Dynamic maximum block size by miner vote: Closed. Proposed replacing Bitcoin's fixed 1 MB block size limit with one that miners could vote to raise or lower, with votes counted on the same two-week cycle as mining difficulty adjustments. It was one…
- BIP 101: Increase maximum block size: Closed. Proposed replacing the fixed 1 MB block size limit with a limit that grows automatically on a predictable schedule over time. Supporters argued it would let Bitcoin handle more transactions as…
- BIP 102: Block size increase to 2MB: Closed. Proposed a single, simple increase in the maximum block size from 1 MB to 2 MB to allow more transactions per block. Being a change that older software would reject, it would have required a hard…
- BIP 103: Block size following technological growth: Closed. Proposed gradually increasing the block size limit at a rate meant to track improvements in hardware and internet bandwidth. The goal was to allow more transactions while keeping it practical for…
- BIP 104: 'Block75' - Max block size like difficulty: Closed. Proposed 'Block75', which would adjust the maximum block size every two weeks so that blocks stay about 75 percent full on average. Like the difficulty adjustment, it reacts to recent activity,…
- BIP 107: Dynamic limit on the block size: Closed. Proposed a block size limit that adjusts automatically according to the volume of transactions on the network. The aim was to expand capacity when demand is high while avoiding a fixed number that…
- BIP 172: Define Bitcoin Subunits as Satoshis: Draft. Formally defines a "satoshi" as the smallest unit of bitcoin, one hundred-millionth of a coin, with "sats" as the standard short form. Agreeing on the name helps wallets, exchanges, and…
- BIP 177: Redefine Bitcoin's Base Unit: Draft. Proposes redefining "one bitcoin" as the smallest indivisible unit, currently called a satoshi, so amounts are shown as whole numbers instead of with eight decimal places. Supporters argue this…
- BIP 180: Block size/weight fraud proof: Closed. Describes a compact "fraud proof" that lets lightweight wallets learn that a block breaks Bitcoin's size or weight limit without downloading the whole block. This would help light clients avoid…