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State RFC: Clarify genesis sprout anchors

This commit is contained in:
teor 2020-10-29 21:29:45 +10:00 committed by Deirdre Connolly
parent e2c5b71323
commit b742657e45
1 changed files with 8 additions and 3 deletions
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11
book/src/dev/rfcs/0005-state-updates.md
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@ -663,13 +663,14 @@ 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. If the block is a genesis block, skip any transaction updates.
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.
(Due to a [bug in zcashd](https://github.com/ZcashFoundation/zebra/issues/559),
genesis block 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:
1. Insert `(transaction_hash, BE32(block_height) || BE32(tx_index))` to
@ -695,6 +696,10 @@ transaction(s) in the block that have `JoinSplit`s in the Sprout case and/or
`Spend`/`Output` descriptions in the Sapling case. These should be passed as
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.)
[`JoinSplit`]: https://doc.zebra.zfnd.org/zebra_chain/transaction/struct.JoinSplit.html
[`Spend`]: https://doc.zebra.zfnd.org/zebra_chain/transaction/struct.Spend.html