PANews reported on September 27 that Fractal Bitcoin, a Bitcoin expansion network, posted on the X platform: "We received some user feedback that the block filling of the Fractal mainnet was incomplete. We immediately launched an investigation. Here are more details about the incident: Miners usually prioritize high-fee transactions and are subject to two block size limits: 1. Maximum block size (in bytes); 2. Maximum number of SIG operations. When faced with a large number of high-fee MULTISIG transactions, the block can reach the 80,000 SIG limit and cannot contain more transactions. Typically, Segregated Witness (SegWit) transactions consume 1 SIG, theoretically a block can hold up to 80,000 transactions (80,000/1=80,000). This is far beyond the standard, so the SIG limit is rarely observed in practice. Transactions containing MULTISIG consume 84 SIGs, which means that if a block is completely filled with such transactions, the maximum number of transactions in a block will be reduced to 80,000/84=952. This results in block bytes not being completely filled. We observed that some random blocks were completely filled because they contained low-fee transactions that were not MULTISIG. These transactions filled the remaining 75% of the block space, resulting in an increase in total block fees of about 20%. This situation is due to the existing mechanism of the BTC mainnet and is not a defect of the Fractal browser. We will continue to monitor the situation closely and work hard to improve network connectivity and performance.
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