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5

An extended public or private key is always 78 bytes of data. When Base58 Check encoded, this results in a string that is up to 112 characters in size. The format of the data is defined in BIP 32.


5

It does not have one. Bitcoin Core uses hardened derivation, so there is no way to compute the addresses it will use externally. Support for that will likely be added in upcoming versions, but likely won't be the default (there are security risks when using non-hardened derivation).


3

The electrum public key xpub661MyMwAqRbcG8Zah6TcX3QpP5yJApaXcyLK8CJcZkuYjczivsHxVL5qm9cw8BYLYehgFeddK5WrxhntpcvqJKTVg96dUVL9P7hZ7Kcvqvd is a BIP32 extended public key. This can be used to derive child addresses. The Bitcoin-Core public key 037acd3408dfb612a69204c5f5bafe2a326646398cdd16c85fedd65a4e96a28278 is a hex representation of the compressed form of a ...


3

This will be mostly possible in the upcoming Bitcoin Core 0.18 release. First you need to understand that the sequence of such paired multisig addresses (with public keys generated from 2 xpubs in lockstep) can be described in the new descriptor language. The syntax is sh(multi(2,XPUB/*,XPUB/*)). The sh indicates P2SH embedding, multi refers to multisig, ...


1

You are not deriving hardened child keys. You cannot derive hardened keys from an xpub. Just because the xpub itself is hardened does not mean that its children are.


1

There is https://iancoleman.io/bip39/ Enter your xpub into the BIP32 Root Key box and in the BIP141 tab select the derivation path and address type.


1

You can't do this with bitcoin core since it uses hardened derivation so you can't derive addresses using the extended public key. You should use electrum for this instead. An electrum watch-only wallet can mirror the addresses of a an electrum seeded wallet. So just create an electrum wallet on your desktop as normal and then grab the master public key aka ...


1

I actually discovered the answer: The answer is described on Reddit: https://www.reddit.com/r/ledgerwallet/comments/7d39pu/legacy_to_segwit_wallet_transfer_nightmare/ But if that answer would ever get lost, a summary: Apparently segwit xpub addresses are not a good marriage (yet). The Mycelium wallet imports the xpub address which is generated by the ...


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