You can just send to an arbitrary public key whose private key is unknown and unknowable. Eg nobody knows the private key corresponding to "00000000000000000000

You can just send to an arbitrary public key whose private key is unknown and unknowable. Eg nobody knows the private key corresponding to "00000000000000000000000" or whatever. The chances of someone stumbling across the correct private key is ~zero, even if that address is otherwise valid. https://www.reddit.com/r/Bitcoin/comments/3k8dnq/someone_has_got_cash_to_burn_40_btc_sent_to/ https://www.reddit.com/r/Bitcoin/comments/3k8dnq/someone_has...