Cancelling a coin

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Keybase 20211020:

Q: I want to make a coin that can be "cancelled" and the amount returns to sender. One easy way to do this is to embed the sender's address in the puzzle. Is there another way?

A(Quexington): You can prove your parent's puzzle hash and then allow sending there.

Q (gneale): But how? ASSERT_MY_PARENT_ID - [71] is the closest I thing can find... a nudge in the right direction is sufficient. Thx!

A(Quexington): Okay if you only want a nudge then remember that your parent's ID is made up of three components