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I'm liking the hack the more I think about it, too. Encoding a compressed public key (257 bits) in base32 would be 52 characters, which is comfortably less than the 63-character domain name limit.
Anybody buying a multi-domain (not wildcard) certificate sometime soon? I'm curious to find out if CA's blink if you ask them to issue a certificate valid for something like BTC8df4rfkbmeopl49vvfgkjgtimb84k9gtredsxfr9fekspclen493.mydomain.com