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Auto merge of #3002 - str4d:2957-overwinter-release-notes, r=str4d 

Overwinter release notes and testnet activation height

Closes #2957.
This commit is contained in:
Homu 2018-02-28 05:29:48 -08:00
parent f9dbd1e2d5 138cf77004
commit b10aaacadd
2 changed files with 42 additions and 4 deletions
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43
doc/release-notes.md
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@ -4,6 +4,41 @@ release-notes at release time)
Notable changes
===============
Overwinter network upgrade
--------------------------
The code preparations for the Overwinter network upgrade, as described in [ZIP
200](https://github.com/zcash/zips/blob/master/zip-0200.rst), [ZIP
201](https://github.com/zcash/zips/blob/master/zip-0201.rst), [ZIP
202](https://github.com/zcash/zips/blob/master/zip-0202.rst), [ZIP
203](https://github.com/zcash/zips/blob/master/zip-0203.rst), and [ZIP
143](https://github.com/zcash/zips/blob/master/zip-0143.rst) are
finished and included in this release. Overwinter will activate on testnet at
height 207500, and can also be activated at a specific height in regtest mode
by setting the config option `-nuparams=5ba81b19:HEIGHT`.
However, because the Overwinter activation height is not yet specified for
mainnet, version 1.0.15 will behave similarly as other pre-Overwinter releases
even after a future activation of Overwinter on the network. Upgrading from
1.0.15 will be required in order to follow the Overwinter network upgrade on
mainnet.
Overwinter transaction format
-----------------------------
Once Overwinter has activated, transactions must use the new v3 format
(including coinbase transactions). All RPC methods that create new transactions
(such as `createrawtransaction` and `getblocktemplate`) will create v3
transactions once the Overwinter activation height has been reached.
Overwinter transaction expiry
-----------------------------
Overwinter transactions created by `zcashd` will also have a default expiry
height set (the block height after which the transaction becomes invalid) of 20
blocks after the height of the next block. This can be configured with the
config option `-txexpirydelta`.
UTXO and note merging
---------------------
@ -24,6 +59,10 @@ merging until the number of UTXOs falls below some value).
UTXO memory accounting
----------------------
The default -dbcache has been changed in this release to 450MiB. Users can set -dbcache to a higher value (e.g. to keep the UTXO set more fully cached in memory). Users on low-memory systems (such as systems with 1GB or less) should consider specifying a lower value for this parameter.
The default `-dbcache` has been changed in this release to 450MiB. Users can set
`-dbcache` to a higher value (e.g. to keep the UTXO set more fully cached in
memory). Users on low-memory systems (such as systems with 1GB or less) should
consider specifying a lower value for this parameter.
Additional information relating to running on low-memory systems can be found here: [reducing-memory-usage.md](https://github.com/zcash/zcash/blob/master/doc/reducing-memory-usage.md).
Additional information relating to running on low-memory systems can be found
here: [reducing-memory-usage.md](https://github.com/zcash/zcash/blob/master/doc/reducing-memory-usage.md).

3
src/chainparams.cpp
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@ -263,8 +263,7 @@ public:
consensus.vUpgrades[Consensus::UPGRADE_TESTDUMMY].nActivationHeight =
Consensus::NetworkUpgrade::NO_ACTIVATION_HEIGHT;
consensus.vUpgrades[Consensus::UPGRADE_OVERWINTER].nProtocolVersion = 170003;
consensus.vUpgrades[Consensus::UPGRADE_OVERWINTER].nActivationHeight =
Consensus::NetworkUpgrade::NO_ACTIVATION_HEIGHT;
consensus.vUpgrades[Consensus::UPGRADE_OVERWINTER].nActivationHeight = 207500;
pchMessageStart[0] = 0xfa;
pchMessageStart[1] = 0x1a;