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Would anyone like a cheap service that would map your

addresses to your name or some alias?

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There is CashAccount (https://www.cashaccount.info) Implemented in EC and (I think) paytaca

Shawn-Pringle Автор вопроса
Jonas
There is CashAccount (https://www.cashaccount.info...

Yep but not ideal since uses a single pub key

Shawn-Pringle Автор вопроса
Alex
Yep but not ideal since uses a single pub key

Would a system linked to an xpub be any better?

Shawn Pringle
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.

Alex
Yep but not ideal since uses a single pub key

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

Shawn Pringle
Would a system linked to an xpub be any better?

not a good idea to share xpub, if any 1 of derived privkeys leaks, then xpriv can be derived

bitcoincashautist
not a good idea to share xpub, if any 1 of 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?

tula s
there is such a thing as an xpub thats not the roo...

yes its heirarchical. in addition you can create hardended child keys that cannot be derived from the parent pubkey , only from its private key

JF
yes its heirarchical. in addition you can create ...

Yeah, but can the parent privkey be derived from a keypair that was derived using a hardened path?

tula s
there is such a thing as an xpub thats not the roo...

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

molecular#123 🐓
Yeah, but can the parent privkey be derived from a...

No Hardened is best understood as disabling the exposure of parent info.

tula s
there is such a thing as an xpub thats not the roo...

yeah, there is hardened derivation where leaking child xpub would not compromise higher nodes

bitcoincashautist
yeah, there is hardened derivation where leaking c...

ok so your original statement was a bit misleading and sharing hardened xpubs should be considered as an improvement to sharing addresses.

Tom
No Hardened is best understood as disabling the e...

Thx! I was never sure about that. And thanks @tula_s for asking.

tula s
ok so your original statement was a bit misleading...

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.

Tom
An xpub is hierarchical based. - It either is for ...

the advantage is significantly increased privacy as you say just below.

it will expose it if its unhardened.

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