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I want to know is it possible to generate master public key from an address? if not, what is needed to generate xpub key?
generating master public key from address
Answers
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It's not possible. An address is created though a hash160 (RIPEMD160) which is a one-way function.
Creating a xpub key (bip32 extended public key) requires the according pubkey and the chaincode.
Alternatively you can calculate an xpub from an xpriv (extended private key).
