This BIP defines the derivation scheme for HD wallets using the P2WPKH ([[bip-0173.mediawiki|BIP 173]]) serialization format for segregated witness transactions.
==Motivation==
With the usage of P2WPKH transactions it is necessary to have a common derivation scheme.
It allows the user to use different HD wallets with the same masterseed and/or a single account seamlessly.
Thus the user needs to create dedicated segregated witness accounts, which ensures that only wallets compatible with this BIP will detect the accounts and handle them appropriately.
===Considerations===
We use the same rationale as described in Considerations section of [[bip-0049.mediawiki|BIP 49]].
==Specifications==
This BIP defines the two needed steps to derive multiple deterministic addresses based on a [[bip-0032.mediawiki|BIP 32]] root account.
===Public key derivation===
To derive a public key from the root account, this BIP uses the same account-structure as defined in [[bip-0044.mediawiki|BIP 44]] and [[bip-0049.mediawiki|BIP 49]], but only uses a different purpose value to indicate the different transaction serialization method.
When serializing extended keys, this scheme uses alternate version bytes. Extended public keys use <code>0x04b24746</code> to produce a "zpub" prefix, and private keys use <code>0x04b2430c</code> to produce a "zprv" prefix. Testnet uses <code>0x045f1cf6</code> "vpub" and <code>0x045f18bc</code> "vprv."
This BIP is not backwards compatible by design as described under [#considerations]. An incompatible wallet will not discover accounts at all and the user will notice that something is wrong.
