Title: Issue about Segwit HD Post by: ufaforwork2 on October 22, 2017, 12:50:29 PM This thread proposes changes to BIP49 to address segwit compatibility issues
Breaking backwards compatibility The BIP talks about breaking this, and but it really doesn't. I really feel it should completely break this. Here is why What would happen if you recover a wallet using seed words ? 1. Since there is no difference in seed words between segwit/non segwit, the wallet would discover both m/44' and m/49' accounts 2. Note that we cannot ask the user to choose an account he wants to operate on (Segwit/Non segwit). This is like asking him the HD derivation path and a really bad UI 3. The wallet now has to constantly monitor both m/44' and m/49' accounts for transactions Basically we are always stuck with keeping compatibility with older seed words or always asking the user if the seed words came from segwit/non segwit wallet ! Here is my suggestion : 1. By default all new wallets will be created as segwit m/49' without asking user anything. I think you would agree with me that in future we want most wallet to be default segwit (unless user chooses a non segwit from advanced options)! 2. Segwit wallet seed words have a different format which is incompatible with previous wallet seed words. This encodes the information that this wallet is segwit in the seed words itself. We need to define a structure for this XPUB Derivation This is something not addressed in the BIP yet. 1. Right now you can get an xpub balance/transaction history. Now there is no way to know whether an xpub is from m/44' or m/49' 2. This breaks lots of things. Wallets like electrum/armory/mycelium support importing xpub as a watch only wallet. Also services like blockonomics/blockchain.info use xpub for displaying balance/generating merchant addresses Any help would be greatly appreciated. Thanks Billy. Title: Re: Issue about Segwit HD Post by: achow101 on January 06, 2018, 06:22:07 PM This thread proposes changes to BIP49 to address segwit compatibility issues It's better to do this on the bitcoin-dev mailing list.What would happen if you recover a wallet using seed words ? That is orthogonal to BIP 49. That is something to do with BIP 39 and is unrelated to key derivation. Unfortunately BIP 39 does not have a versioning scheme to give seeds version numbers. |