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