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15:10 < jeremyrubin> btw sanket1729 are you familiar with loop {break v;} in rust? i learned about it recently and i think it could clean up some loop assert things we have https://doc.rust-lang.org/rust-by-example/flow_control/loop/return.html
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15:14 < jeremyrubin> if we do another RC 907/908/909 should all be tiny changes to sneak in
15:18 < jeremyrubin> 909 in particular is nice because it lets us work with the TapTree::from_inner of our builder that uses huffman, and also get the info into a TaprootSpendInfo
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16:45 < ls55> Is there a way to create a `pub struct ExtendedPubKey` from a `secp256k1::key::PublicKey` ?
16:48 < ls55> Maybe `let xpub = ExtendedPubKey::decode(&pubkey.serialize());` ?
17:06 < ls55> No, this throws an error: `Err  value: WrongExtendedKeyLength(33)`
17:51 < shesek> it is not directly convertible, an ExtendedPubKey also has a 32 bytes chain code associated with it
17:52 < shesek> one would typically take a 512 bit hash and use the left half as the key and right half as the chain code
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20:29 < ls55> Thanks. Makes sense.
20:30 < ls55> ```
20:30 < ls55> let key_pair = KeyPair::new(&secp, &mut secp256k1::rand::thread_rng());
20:30 < ls55> let secret_key = SecretKey::from_keypair(&key_pair);
20:30 < ls55> let pub_key = PublicKey::from_keypair(&key_pair);
20:30 < ls55> let xpriv = ExtendedPrivKey::new_master(network, &p_r.secret_bytes()).unwrap();
20:30 < ls55> ```
20:30 < ls55> Given the code above. It is possible to create an xpriv only from a private key (`secret_key`).
20:30 < ls55> Would it be possible to create an `ExtendedPubKey` (using only` pub_key`, without access to `xpriv` or` secret_key`) that generates the same addresses as `xpriv`?
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21:21 < ls55> Basically, it would be to generate addresses from a public master key instead of using the master private key.
21:28 < ls55> * master public key
21:37 < jeremyrubin> You can do hardened derivation only with access to xpriv 
21:37 < jeremyrubin> You can do public derivation with only pub
21:44 < ls55> If I don't intend to do hardened derivation (e.g.: `xpub.../*`), is there a way to derive BIP 32 addresses from a `secp256k1::key::PublicKey` (using it as master public key) ?
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22:11 < jeremyrubin> yes
22:11 < jeremyrubin> well idk about BIP-32
22:12 < jeremyrubin> but you can do a derivation of sorts if you just need that
22:12 < jeremyrubin> IDK if you can derive from just a Pk
22:26 < ls55> Thanks. Makes sense. Maybe `bitcoin::util::bip32 pub struct ExtendedPubKey` doesn't have the interface to use it as a master public key. At least, that's what it seems.
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--- Log closed Fri Mar 25 00:00:37 2022