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Merge pull request #53 from daira/daira-unifiedaddrs 

Orchard book: minimal description of unified addresses
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@ -35,12 +35,14 @@ We make several structural changes, building on the lessons learned from Sapling
for diversified addresses.
Other than the above, Orchard retains the same design rationale for its keys and addresses
as Sapling, and the same bech32 encoding. For example, diversifiers remain at 11 bytes, so
that Orchard addresses are the same length as Sapling addresses.
as Sapling. For example, diversifiers remain at 11 bytes, so that a raw Orchard address is
the same length as a raw Sapling address.
The "human-readable part" for Orchard payment addresses is "zo", i.e. all addresses
have the prefix "zo1". Other prefixes and key formats will be described in section 5.6
of the protocol specification.
Orchard payment addresses do not have a stand-alone string encoding. Instead, we define
"unified addresses" that can bundle together addresses of different types, including
Orchard. Unified addresses have a Human-Readable Part of "u" on Mainnet, i.e. they will
have the prefix "u1". For specifications of this and other formats (e.g. for Orchard viewing
and spending keys), see section 5.6.4 of the NU5 protocol specification [#NU5-orchardencodings].
## Hierarchical deterministic wallets
@ -95,3 +97,4 @@ and more complicated "extended" ones defined by ZIP 32.)
[BIP 32]: https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
[BIP 44]: https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki
[ZIP 32]: https://zips.z.cash/zip-0032
[NU5-orchardencodings]: https://zips.z.cash/protocol/nu5.pdf#orchardencodings