mirror of https://github.com/zcash/zips.git
e381ded490
transaction in a block. This wording was copied from the Bitcoin Developer Reference (https://developer.bitcoin.org/reference/transactions.html#coinbase-input-the-input-of-the-first-transaction-in-a-block), but it does not match the implementation in zcashd that was inherited from Bitcoin Core. Instead, a coinbase transaction should be, and now is, defined as a transaction with a single null prevout. The specifications of consensus rules have been clarified and adjusted (without any actual consensus change) to take this into account, as follows: * a block MUST have at least one transaction; * the first transaction in a block MUST be a coinbase transaction, and subsequent transactions MUST NOT be coinbase transactions; * a transparent input in a non-coinbase transaction MUST NOT have a null prevout; * every non-null prevout MUST point to a unique UTXO in either a preceding block, or a *previous* transaction in the same block (this rule was previously not given explicitly because it was assumed to be inherited from Bitcoin); * the rule that "A coinbase transaction MUST NOT have any transparent inputs with non-null prevout fields" is removed as an explicit consensus rule because it is implied by the corrected definition of coinbase transaction. Signed-off-by: Daira Hopwood <daira@jacaranda.org> |
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README.template
.. Title: Specifications and Zcash Improvement Proposals What are ZIPs? -------------- Zcash Improvement Proposals (ZIPs) are the way to: * propose new features for the `Zcash cryptocurrency <https://z.cash/>`__ and their rationale, * specify the implementation details of the feature, * collect community input on the proposal, and * document design decisions. Contributing ------------ The authors of a ZIP are responsible for building consensus within the community and documenting / addressing dissenting opinions. Anyone can write a ZIP! We encourage community contributions and decentralization of work on the Zcash protocol. If you’d like to bounce ideas off people before formally writing a ZIP, we encourage it! Visit the `ZcashCommunity Discord chat <https://discord.gg/kdjfvps>`__ to talk about your idea. Participation in the Zcash project is subject to a `Code of Conduct <https://github.com/zcash/zcash/blob/master/code_of_conduct.md>`__. The Zcash protocol is documented in its `Protocol Specification <protocol/protocol.pdf>`__. To start contributing, first read `ZIP 0 <zip-0000.rst>`__ which documents the ZIP process. Then clone `this repo <https://github.com/zcash/zips>`__ from GitHub, and start adding your draft ZIP, formatted either as reStructuredText or as Markdown. For example, if using reStructuredText, use a filename matching ``draft-*.rst``. Use ``make`` to check that you are using correct `reStructuredText <https://docutils.sourceforge.io/rst.html>`__ or `Markdown <https://pandoc.org/MANUAL.html#pandocs-markdown>`__ syntax, and double-check the generated ``draft-*.html`` file before filing a Pull Request. NU5 ZIPs -------- This is the list of ZIPs relevant to the proposed NU5 Upgrade, which is planned to activate on Mainnet in January 2022: - `ZIP 32: Shielded Hierarchical Deterministic Wallets <zip-0032.rst>`__ (updated) - `ZIP 203: Transaction Expiry <zip-0203.rst>`__ (updated) - `ZIP 209: Prohibit Negative Shielded Chain Value Pool Balances <zip-0209.rst>`__ (updated) - `ZIP 212: Allow Recipient to Derive Ephemeral Secret from Note Plaintext <zip-0212.rst>`__ (updated) - `ZIP 213: Shielded Coinbase <zip-0213.rst>`__ (updated) - `ZIP 216: Require Canonical Jubjub Point Encodings <zip-0216.rst>`__ - `ZIP 221: FlyClient - Consensus-Layer Changes <zip-0221.rst>`__ (updated) - `ZIP 224: Orchard Shielded Protocol <zip-0224.rst>`__ - `ZIP 225: Version 5 Transaction Format <zip-0225.rst>`__ - `ZIP 239: Relay of Version 5 Transactions <zip-0239.rst>`__ - `ZIP 244: Transaction Identifier Non-Malleability <zip-0244.rst>`__ - `ZIP 252: Deployment of the NU5 Network Upgrade <zip-0252.rst>`__ - `ZIP 316: Unified Addresses and Unified Viewing Keys <zip-0316.rst>`__ - `ZIP 401: Addressing Mempool Denial-of-Service <zip-0401.rst>`__ (clarified) License ------- Unless otherwise stated in this repository’s individual files, the contents of this repository are released under the terms of the MIT license. See `COPYING <COPYING.rst>`__ for more information or see https://opensource.org/licenses/MIT .