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Clarify edge case

This commit is contained in:
teor 2020-10-29 21:35:09 +10:00 committed by Deirdre Connolly
parent b742657e45
commit f338048012
1 changed files with 10 additions and 6 deletions
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16
book/src/dev/rfcs/0005-state-updates.md
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@ -663,13 +663,13 @@ check that `block`'s parent hash is `null` (all zeroes) and its height is `0`.
- `(height, hash)` into `hash_by_height`;
- `(height, block)` into `block_by_height`.
3. Update the `sprout_anchors` and `sapling_anchors` trees with the Sprout and
Sapling anchors.
4. If the block is a genesis block, skip any transaction updates.
3. If the block is a genesis block, skip any transaction updates.
(Due to a [bug in zcashd](https://github.com/ZcashFoundation/zebra/issues/559),
genesis block transactions are ignored during validation.)
genesis block anchors and transactions are ignored during validation.)
4. Update the `sprout_anchors` and `sapling_anchors` trees with the Sprout and
Sapling anchors.
5. Iterate over the enumerated transactions in the block. For each transaction:
@ -698,7 +698,11 @@ fields in the `Commit*Block` requests.
Due to the coinbase maturity rules, the Sprout root is the empty root
for the first 100 blocks. (These rules are already implemented in contextual
validation and the anchor calculations.)
validation and the anchor calculations.) Therefore, `zcashd`'s genesis bug is
irrelevant for the mainnet and testnet chains.
Hypothetically, if Sapling were activated from genesis, the specification requires
a Sapling anchor, but `zcashd` would ignore that anchor.
[`JoinSplit`]: https://doc.zebra.zfnd.org/zebra_chain/transaction/struct.JoinSplit.html
[`Spend`]: https://doc.zebra.zfnd.org/zebra_chain/transaction/struct.Spend.html