Time is the only thing
you can't get back.

Pick a second. The one your daughter was born. The one you said yes. The one you finally left. The one the plane landed. It gets written into the registry with your name on it, and nobody else can ever claim it.

You receive a certificate of ownership with a serial number and a permanent page anyone can visit to check that it's real. It's symbolic. It's also the only one there will ever be.