We received some user feedback regarding the incomplete filling of blocks on Fractal mainnet. We immediately launched an investigation. Here’s more details on what happened: Miners generally prioritize high-fee transactions and are subject to two block size constraints: 1) the maximum block size in bytes, 2) the maximum number of SIG operations. When faced with a large amount of high-fee MULTISIG transactions, blocks can reach the SIG limit of 80,000 and can no longer include more transactions. 🔸 Typically, a Segregated Witness (SegWit) transaction consumes 1 SIG, allowing a theoretical maximum of 80,000 transactions in a block (80,000/1=80,000). This far exceeds the norm, so the SIG limit is rarely observed in practice. 🔸 A transaction that includes MULTISIG consumes 84 SIGs, meaning that if a block is fully filled with such transactions, the maximum number of transactions in a block would be reduced to 80,000/84 = 952. This results in blocks bytes not fully packed. We observed that certain random blocks were fully packed because they included low-fee transactions that were not MULTISIG. These transactions filled the remaining 75% of the block space, leading to an approximate 20% increase in the total block fees. Such occurrence is a result of the existing mechanisms on the BTC mainnet and not a bug with the Fractal explorer. We will continue to monitor the situation closely and work on improving network connectivity and performance.

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