Fractal Bitcoin has activated its FIP-101 node upgrade at block height 1,500,000, completing the first phase of planned consensus changes and formally launching standardized index construction on the network.
The upgrade has received backing from major Bitcoin mining pools, including Foundry, AntPool, ViaBTC, F2Pool, and Binance Pool. Together, these pools represent approximately 85% of Bitcoin’s total network hash rate, signaling broad miner alignment with the upgrade.
Consensus changes and index integration
According to the Fractal Bitcoin team, FIP-101 marks a key milestone in the network’s evolution, finalizing initial consensus adjustments while introducing a standardized framework for index construction. As part of the upgrade, index nodes will be integrated into the core block production and incentive layer, rather than operating as a peripheral system.
The network’s block production structure will also undergo a phased transition. Fractal Bitcoin said it will move from its current 1:2 ratio of merged mining to solo mining toward a ternary structure, balancing merged mining, solo mining, and index block production at a 1:1:1 ratio.