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What makes a compressed pubkey invalid with a valid prefix and length?

Moussa by Moussa
June 12, 2025
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BIP 32 has a test vector with the note:

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invalid pubkey 020000000000000000000000000000000000000000000000000000000000000007

This is a compressed pubkey when decoding an extended pubkey (‘xpub…’).

What makes the pubkey invalid?



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