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Consensus (hard fork)

BIP 52: Durable, Low Energy Bitcoin PoW: Closed. Proposed replacing Bitcoin's mining puzzle with one designed for optical computing chips, so mining costs would depend more on hardware than on electricity. The aim was to cut energy use and spread…
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 105: Consensus based block size retargeting algorithm: Closed. Proposed a mechanism for changing the maximum block size based on votes or consensus among network participants rather than a fixed number. It aimed to let the limit adapt over time without repeated…
BIP 106: Dynamically Controlled Bitcoin Block Size Max Cap: Closed. Proposed letting the maximum block size rise or fall at each difficulty adjustment based on how full recent blocks were, with a variant that also considered miners' fee income. The idea was to adapt…
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 109: Two million byte size limit with sigop and sighash limits: Closed. Proposed doubling the block size limit from 1 MB to 2 MB, alongside new caps on signature checks and data hashing to stop specially crafted blocks from overloading nodes. It was associated with the…
BIP 131: "Coalescing Transaction" Specification (wildcard inputs): Closed. Proposed a new kind of transaction that could spend all coins sent to an address at once using a single 'wildcard' input. This would make consolidating many small payments much cheaper, but would…
BIP 134: Flexible Transactions: Closed. Proposes a new, tag-based transaction format that would make Bitcoin transactions easier to extend with new fields later. It would also fix transaction malleability (the ability to alter a…