I don't agree.
Gnutella is a protocol in development and while I do not agree with some GDF ideas I prefer collecting/envolving ideas and suggesting new ones. In this particular case, the GDF-HUGE proposal itself is still an proposal in change and it also does not prescribe SHA1. Don't claim something a standard which isn't.

> SHA1 was used because it would be difficult to create a fake file with the hash the matches something else.

No argument. You give me SHA1 hash, I send back something junk data. It was often discussed that hashs are NOT used for security reasons just for simple file identifcation, a smaller hash is fine also. If you need a ensurance to get no junk data, use overlapped file resume.

> TigerTree [...] would be an excellent way for the sharing of partial files.

Please give an explanation or URL for our readers.