Was the torrent protocol considered at some point? Always surprised how little presence has in the industry considering how good the technology is.

If you strip out the swarm logic (ie. downloading from multiple peers), you're just left with a protocol that transfers big files via chunks, so there's no reason that'd be faster than any other sort of download manager that supports multi-thread downloads.

https://en.wikipedia.org/wiki/Download_manager

Aspera did the chunking and encryption for you, and it looked and acted like SFTP.

The cost of leaking data was/is catastrophic (as in company ending) So paying a bit of money to guarantee that your data was being sent to the right place (point to point) and couldn't leak was a worthwhile tradeoff.

For Point to point transfer torrenting is a lot higher overhead than you want. plus most clients have an anti-leaching setting, so you'd need not only a custom client, but a custom protocol as well.

The idea is sound though, have an index file with and then a list of chunks to pull over multiple TCP connections.

torrent is great for many-to-one type downloads but I assume GP is talking about single machine to single machine transfers.