I dont think you can prove you have destroyed a bitcoin, neither your own bitcoin, nor someone else's. To destroy it you would have to prove you deleted the coin private key, and you could always have an offline backup.
You could uncreate a coin by creating a chain removing it from existance, by having significantly more compute cycles than the rest of the network combined. Even that is dubious - not clear what would happen if the rest of the network colluded and agreed you did that - could they get together and reject your undo even though it was a more expensive chain? Maybe... not been tested yet. Adam _______________________________________________ cryptography mailing list [email protected] http://lists.randombit.net/mailman/listinfo/cryptography
