Fractal Bitcoin completed its first halving at block height 2,100,000. After the upgrade took effect, the block reward on the Fractal network side was reduced to 6.25 FB. The remaining budget was allocated equally for future distribution on the Bitcoin mainnet. The project team stated that within the first 10 minutes after activation, both nodes and indexing services operated normally.
FIP-102 Synchronize the adjustment of the issuance structure
This halving is accompanied by the implementation of a consensus upgrade involving FIP-102. According to the new plan, the issuance rate of Fractal per block, which was originally 25 FB, has been rearranged. During the first scheduled halving, the reward will be reduced to 12.5 FB. Additionally, the network's second halving has been brought forward, resulting in a further reduction of the block reward that can be directly obtained by Fractal to 6.25 FB.
The project team stated that this adjustment will not increase the total supply of FB, nor will it result in the generation of additional new tokens due to the future distribution of FB on the Bitcoin mainnet. According to the design, the 6.25 FB on the Fractal side corresponds to the same unified supply arrangement as the 6.25 FB on the Bitcoin mainnet side.
The allocation ratios for the three types of mining remain unchanged.
FIP-102 There has been no change. Fractal The existing three types of mining allocation frameworks—merged mining, permissionless mining, and index mining—still maintain a 1:1:1 block allocation ratio. In other words, within every cycle of 3 blocks, each of these three mechanisms receives 1 block.
- Block height achieved after halving: 2,100,000
- Fractal New block reward: 6.25 FB
- Bitcoin mainnet reserved distribution budget: 6.25 FB in equal amounts
Before the halving, calculated based on a block reward of 25 FB, each of these three mechanisms corresponded to approximately 8.33 FB per block cycle on average. After the halving, the reward for each eligible Fractal block became 6.25 FB, which translates to an average of approximately 2.0833 FB for each of the three mechanisms.
Bitcoin mainnet distribution will be advanced in the first quarter of 2027
According to the plan, the budget of 6.25 FB reserved for the Bitcoin mainnet will not be distributed in its entirety immediately, but will be rolled out in phases. The project intends to allow users to earn FB through qualified interactions on the Bitcoin mainnet in the future, rather than relying solely on activities within the Fractal chain.
The accompanying FIP-103 will provide additional technical details, including which interaction behaviors meet the distribution criteria, the specific distribution methods, the requirements for going live, as well as the 1:1 conversion process between Fractal and the Bitcoin mainnet. It is expected that the related research and development for this project will continue for another 3 to 6 months. Testing will begin in the fourth quarter of 2026, with the goal of full launch set for the first quarter of 2027.
The project also stated that a 1:1 conversion mechanism will be introduced between Fractal and the Bitcoin mainnet. When tokens are converted between the two environments, no additional new FB will be issued.
Connections with Bitcoin miners continue to expand.
Fractal has previously been continuously strengthening its connections with Bitcoin miners. In April 2025, Foundry joined its merged mining network. At that time, the project stated that this allowed the protocol to access computing power equivalent to 93% of the total Bitcoin network's hash rate. Since both Fractal and Bitcoin use SHA-256, miners can protect both networks through merged mining without having to dedicate computing power to each chain separately.
In November 2024, Binance Pool also began to support Fractal Bitcoin merge mining, allowing Bitcoin miners using this service to send FB rewards to external wallets. The Fractal mainnet was launched in September 2024, utilizing Bitcoin Core code and the same SHA-256 hashing algorithm as Bitcoin.
According to the current adjusted schedule, the next halving of Fractal block rewards will occur at block height 4,200,000. At that time, the Fractal side rewards and the distribution budget for the Bitcoin mainnet are expected to continue to be reduced proportionally, unless a new FIP mechanism is introduced later on to modify these settings again.
