Dad: Son, how can I convert a 24 word seed into a 12 word seed (BIP39)? 12 words can be better memorized.

Son: Hi Dad,

Converting a 24 into a 12 word seed is impossible.

According to BIP 39, a mnemonic seed is converted into a binary seed using PBKDF2-SHA-512.

To turn a 24 word seed into a 12 word seed, you'd need to find a 12 word seed that produced the same binary seed, which is believed to be impossible.

Dad: Oh, I see.

It will take me a while to learn all 24 words.

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