What if the work output was bound to a particular source IP? That'd stop most "theft" at the expense of discards when your device switches networks.
replyAnubis does this. Happy Eyeballs (https://en.wikipedia.org/wiki/Happy_Eyeballs), IPv6 privacy extensions (https://oneuptime.com/blog/post/2026-01-15-ipv6-privacy-exte...), and devices migrating between home and mobile IP addresses as the person moves have all caused issues with this. Fixing this is hard, but I have been trying.
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