is it possible to use the python util to create a new bootstrap.dat starting at block 250001 ? For example - to update an off-line PC which has only had previous access to the 250k bootstrap.dat.
Creating a new 10gb+ file up to 270k+ seems silly when I only need to create the difference between the two (and easier to transfer to off-line PC).
Thanks.
Bitcoin 0.8.5 has a checkpoint block in it at 250,000 and less checks are done when downloading or importing blocks before this point. After block 250,000, download/sync/import speed is usually CPU-limited.
Bitcoin looks for any file named bootstrap.dat when it starts up, imports the blocks from it, and renames it. If the blocks are duplicates, it will ignore them. If the blocks are unseen and continue from the last block, it will import them.