It’s of interest to note that public and private key cryptography is not only used for encryption and decryption, but also used for the verification of digital signatures — used in Bitcoin ...

The Infinity Day Public and Private Keys are limited edition art pieces arising from within the Bitcoin community, code, culture and cryptographic history ... Not much time to birth a meme holiday… ...

The easiest solution is to gift the bitcoin but keep the key. When the time comes, the recipient can request the key from you, which you can furnish if you want. Since you have the key ...