Several opensource projects, especially Linux distributions, have solved this problem long ago by setting up a web of volunteer mirrors. They docs and scripts t

Several opensource projects, especially Linux distributions, have solved this problem long ago by setting up a web of volunteer mirrors. They docs and scripts to quickly set up an additional mirror. The central HTTP server of easylist could then hand out 302s to fetch the actual file from one of the mirrors. Alternatively to 302s, a modern scriptable DNS server, that uses the mirror list, responds with different IPs, round-robin (or even better if it's geo-aware). DNS TXT records could maybe be used to serve a digest of the file, do that mirrors can't modify it without that being detected.