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I'm reading Mastring Bitcoin/ch05. In this chapter, it says "Because the extended key is 512 or 513 bits, it is also much longer than other Base58Check-encoded strings we have seen previously."

Why can an extended key be 513 bits long? I think it should be: pub/private-key(256bits) + chain-code(256bits) = 512bits.

Bicheng
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    Does this answers your question? https://bitcoin.stackexchange.com/questions/114314/how-the-extended-key-in-wallet-is-512-bits – bordalix Dec 15 '22 at 06:00

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