addresses to your name or some alias?
There is CashAccount (https://www.cashaccount.info) Implemented in EC and (I think) paytaca
What is yours?
Yep but not ideal since uses a single pub key
Would a system linked to an xpub be any better?
Not really. If you give away your xpub to the public anyone can see all addresses.
it's still better for a merchant to put up a printed QR of a p2pkh address than using a RPA. It just works massively easier and since the merchant doesn't need to have the private keys on premises it really isn't something that needs solving
not a good idea to share xpub, if any 1 of derived privkeys leaks, then xpriv can be derived
there is such a thing as an xpub thats not the root one right? can the root one be compromised when the branch is compromised? eg i derive 10 xpubs from the root one and give them out. i derive priv key from xpub7 this key leaks - is the root xpub compromised or just the corresponding xpub 7?
yes its heirarchical. in addition you can create hardended child keys that cannot be derived from the parent pubkey , only from its private key
Yeah, but can the parent privkey be derived from a keypair that was derived using a hardened path?
An xpub can be just for a certain level For instance only the change keys. If you just went change 7, that's a pub key and not an xpub
No Hardened is best understood as disabling the exposure of parent info.
yeah, there is hardened derivation where leaking child xpub would not compromise higher nodes
ok so your original statement was a bit misleading and sharing hardened xpubs should be considered as an improvement to sharing addresses.
Thx! I was never sure about that. And thanks @tula_s for asking.
An xpub is hierarchical based. - It either is for an entire wallet. - It is for all main addressees OR all change addresses. - Or, last, it can be for exactly one address. There isn't any advantage to having an xpub for one address, too much overhead, just use the actual address. Shorter and simpler.
the advantage is significantly increased privacy as you say just below.
it will expose it if its unhardened.
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