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Add Sapling details to release notes

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Jack Grigg 2018-05-23 11:27:13 +12:00
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@ -4,6 +4,47 @@ release-notes at release time)
Notable changes
===============
Sapling network upgrade
-----------------------
The consensus code preparations for the Sapling network upgrade, as described
in [ZIP 243](https://github.com/zcash/zips/blob/master/zip-0243.rst) and the
[Sapling spec](https://github.com/zcash/zips/blob/master/protocol/sapling.pdf)
are finished and included in this release. Sapling support in the wallet and
RPC is ongoing, and is expected to land in master over the next few weeks.
The [Sapling MPC](https://blog.z.cash/announcing-the-sapling-mpc/) is currently
working on producing the final Sapling parameters. In the meantime, Sapling will
activate on testnet with dummy Sapling parameters at height XXXXXX. This
activation will be temporary, and the testnet will be rolled back by version
2.0.0 so that both mainnet and testnet will be using the same parameters.
Users who want to continue testing Overwinter should continue to run version
1.1.0 on testnet, and then upgrade to 2.0.0 (which will be released after
Overwinter activates).
Sapling can also be activated at a specific height in regtest mode by
setting the config options `-nuparams=5ba81b19:HEIGHT -nuparams=76b809bb:HEIGHT`.
These config options will change when the testnet is rolled back for 2.0.0
(because the branch ID for Sapling will change, due to us following the safe
upgrade conventions we introduced in Overwinter).
Users running testnet or regtest nodes will need to run
`./zcutil/fetch-params.sh --testnet` (for users building from source) or
`zcash-fetch-params --testnet` (for binary / Debian users).
As a reminder, because the Sapling activation height is not yet specified for
mainnet, version 1.1.1 will behave similarly as other pre-Sapling releases even
after a future activation of Sapling on the network. Upgrading from 1.1.1 will
be required in order to follow the Sapling network upgrade on mainnet.
Sapling transaction format
--------------------------
Once Sapling has activated, transactions must use the new v4 format (including
coinbase transactions). All RPC methods that create new transactions (such as
`createrawtransaction` and `getblocktemplate`) will create v4 transactions once
the Sapling activation height has been reached.
zcash-cli: arguments privacy
----------------------------