Yes 
, there is more to it. Especially to a serialized block…
- the header is 80 bytes, accounting for 320 WU
- usually, a 3 byte var_int for the number of transactions accounting for 12 WU (if a 1 byte var_int is enough, this is 4 WU)
This leaves us with 332 WU. As we check that the package weight is NOT >= 3,992,000 (i.e. we check that < 3,992,000), we actually have a soft-maximum of 3,991,999 WU.
This allows looking at how close the pools came to actually fill the block: Seems like Foundry, SBI Crypto, Braiins, and Luxor had 0 WU left in their blocks. This also indicates that all listed pools are currently using the default -blockmaxweight=3999000.
| Pool Name | max block weight | max coinbase weight | min WU left to fill |
|---|---|---|---|
| Foundry USA | 3993523 | 1192 | 0 |
| Binance Pool | 3993768 | 1440 | 3 |
| Luxor | 3993811 | 1480 | 0 |
| AntPool | 3993918 | 1612 | 25 |
| ViaBTC | 3993612 | 1284 | 3 |
| Poolin | 3993613 | 1336 | 54 |
| Braiins Pool | 3993416 | 1124 | 39 |
| SBI Crypto | 3993047 | 716 | 0 |
| Ultimus Pool | 3993768 | 1440 | 3 |
| BTC-com | 3993781 | 1472 | 22 |
| SpiderPool | 3993616 | 1288 | 3 |
| WhitePool | 3993631 | 1304 | 4 |
| EMCDPool | 3993428 | 1304 | 207 |
| Pega Pool | 3993018 | 688 | 1 |
| Titan | 3993020 | 696 | 7 |
| KuCoin Pool | 3993504 | 1316 | 143 |
| Terra Pool | 3993172 | 844 | 3 |
| CleanIncentive | 3993038 | 728 | 21 |
| 1THash | 3993412 | 1084 | 3 |
| NiceHash | 3993148 | 820 | 3 |
| CKPool | 3993181 | 856 | 6 |
This is probably incorrect then.