mirror of https://github.com/zcash/zips.git
Merge pull request #695 from daira/zip-317-txunpaidactionlimit
ZIP 317: describe deployments and move status to Active
This commit is contained in:
Daira Hopwood
GitHub
commit
0464b4893f
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@ -133,7 +133,7 @@ Index of ZIPs
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<tr> <td><span class="reserved">314</span></td> <td class="left"><a class="reserved" href="zip-0314.rst">Privacy upgrades to the Zcash light client protocol</a></td> <td>Reserved</td>
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<tr> <td><span class="reserved">315</span></td> <td class="left"><a class="reserved" href="zip-0315.rst">Best Practices for Wallet Handling of Multiple Pools</a></td> <td>Reserved</td>
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<tr> <td>316</td> <td class="left"><a href="zip-0316.rst">Unified Addresses and Unified Viewing Keys</a></td> <td>Final</td>
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<tr> <td>317</td> <td class="left"><a href="zip-0317.rst">Proportional Transfer Fee Mechanism</a></td> <td>Draft</td>
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<tr> <td>317</td> <td class="left"><a href="zip-0317.rst">Proportional Transfer Fee Mechanism</a></td> <td>Active</td>
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<tr> <td><span class="reserved">318</span></td> <td class="left"><a class="reserved" href="zip-0318.rst">Associated Payload Encryption</a></td> <td>Reserved</td>
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<tr> <td><span class="reserved">319</span></td> <td class="left"><a class="reserved" href="zip-0319.rst">Options for Shielded Pool Retirement</a></td> <td>Reserved</td>
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<tr> <td>321</td> <td class="left"><a href="zip-0321.rst">Payment Request URIs</a></td> <td>Proposed</td>
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@ -107,7 +107,7 @@
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<tr> <td><span class="reserved">314</span></td> <td class="left"><a class="reserved" href="zip-0314">Privacy upgrades to the Zcash light client protocol</a></td> <td>Reserved</td>
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<tr> <td><span class="reserved">315</span></td> <td class="left"><a class="reserved" href="zip-0315">Best Practices for Wallet Handling of Multiple Pools</a></td> <td>Reserved</td>
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<tr> <td>316</td> <td class="left"><a href="zip-0316">Unified Addresses and Unified Viewing Keys</a></td> <td>Final</td>
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<tr> <td>317</td> <td class="left"><a href="zip-0317">Proportional Transfer Fee Mechanism</a></td> <td>Draft</td>
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<tr> <td>317</td> <td class="left"><a href="zip-0317">Proportional Transfer Fee Mechanism</a></td> <td>Active</td>
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<tr> <td><span class="reserved">318</span></td> <td class="left"><a class="reserved" href="zip-0318">Associated Payload Encryption</a></td> <td>Reserved</td>
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<tr> <td><span class="reserved">319</span></td> <td class="left"><a class="reserved" href="zip-0319">Options for Shielded Pool Retirement</a></td> <td>Reserved</td>
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<tr> <td>321</td> <td class="left"><a href="zip-0321">Payment Request URIs</a></td> <td>Proposed</td>
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@ -15,7 +15,7 @@ Credits: Madars Virza
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Kris Nuttycombe
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Jack Grigg
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Francisco Gindre
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Status: Draft
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Status: Active
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Category: Standards / Wallet
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Obsoletes: ZIP 313
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Created: 2022-08-15
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@ -263,7 +263,7 @@ Pull-Request: <<a href="https://github.com/zcash/zips/pull/631">https://githu
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<p>zcashd, zebrad, and potentially other node implementations, implement fee-based restrictions on relaying of mempool transactions. Nodes that normally relay transactions are expected to do so for transactions that pay at least the conventional fee as specified in this ZIP, unless there are other reasons not to do so for robustness or denial-of-service mitigation.</p>
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<p>If a transaction has more than
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<span class="math">\(block\_unpaid\_action\_limit\)</span>
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"unpaid actions" as defined by the <a href="#recommended-algorithm-for-block-template-construction">Recommended algorithm for block template construction</a>, it will never be mined by that algorithm. Nodes MAY drop these transactions.</p>
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"unpaid actions" as defined by the <a href="#recommended-algorithm-for-block-template-construction">Recommended algorithm for block template construction</a>, it will never be mined by that algorithm. Nodes MAY drop these transactions, or transactions with more unpaid actions than a configurable limit (see the <a href="#deployment">Deployment</a> section for actual behaviour of node implementations).</p>
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</section>
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<section id="mempool-size-limiting"><h3><span class="section-heading">Mempool size limiting</span><span class="section-anchor"> <a rel="bookmark" href="#mempool-size-limiting"><img width="24" height="24" class="section-anchor" src="assets/images/section-anchor.png" alt=""></a></span></h3>
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<p>zcashd and zebrad limit the size of the mempool as described in <a id="footnote-reference-6" class="footnote_reference" href="#zip-0401">7</a>. This specifies a
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@ -398,6 +398,59 @@ Pull-Request: <<a href="https://github.com/zcash/zips/pull/631">https://githu
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threshold described in <a href="#mempool-size-limiting">Mempool size limiting</a> immediately.</p>
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<p>Nodes supporting block template construction SHOULD deploy the new <a href="#recommended-algorithm-for-block-template-construction">Recommended algorithm for block template construction</a> immediately, and miners SHOULD use nodes that have been upgraded to this algorithm.</p>
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<p>Node developers SHOULD coordinate on schedules for deploying restrictions to their policies for transaction mempool acceptance and peer-to-peer relaying. These policy changes SHOULD NOT be deployed before the changes to block template construction for miners described in the preceding paragraph.</p>
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<section id="deployment-in-zcashd"><h3><span class="section-heading">Deployment in zcashd</span><span class="section-anchor"> <a rel="bookmark" href="#deployment-in-zcashd"><img width="24" height="24" class="section-anchor" src="assets/images/section-anchor.png" alt=""></a></span></h3>
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<p><cite>zcashd</cite> v5.5.0 implemented use of ZIP 317 fees by default for its internal wallet in the following PRs:</p>
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<ul>
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<li><a href="https://github.com/zcash/zcash/pull/6527">https://github.com/zcash/zcash/pull/6527</a> (fee computation)</li>
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<li><a href="https://github.com/zcash/zcash/pull/6524">https://github.com/zcash/zcash/pull/6524</a> (main implementation)</li>
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<li><a href="https://github.com/zcash/zcash/pull/6559">https://github.com/zcash/zcash/pull/6559</a> (follow-up to #6524)</li>
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<li><a href="https://github.com/zcash/zcash/pull/6568">https://github.com/zcash/zcash/pull/6568</a> (for <code>z_shieldcoinbase</code>)</li>
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<li><a href="https://github.com/zcash/zcash/pull/6576">https://github.com/zcash/zcash/pull/6576</a> (follow-up to #6568)</li>
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<li><a href="https://github.com/zcash/zcash/pull/6569">https://github.com/zcash/zcash/pull/6569</a> (for <code>z_mergetoaddress</code>)</li>
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</ul>
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<p><cite>zcashd</cite> v5.5.0 implemented the <a href="#recommended-algorithm-for-block-template-construction">Recommended algorithm for block template construction</a> in:</p>
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<ul>
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<li><a href="https://github.com/zcash/zcash/pull/6460">https://github.com/zcash/zcash/pull/6460</a> (preparation)</li>
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<li><a href="https://github.com/zcash/zcash/pull/6607">https://github.com/zcash/zcash/pull/6607</a> (follow-up to #6460)</li>
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<li><a href="https://github.com/zcash/zcash/pull/6527">https://github.com/zcash/zcash/pull/6527</a> (fee computation)</li>
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<li><a href="https://github.com/zcash/zcash/pull/6564">https://github.com/zcash/zcash/pull/6564</a> (block template construction)</li>
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</ul>
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<p>The value used for
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<span class="math">\(block\_unpaid\_action\_limit\)</span>
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by <cite>zcashd</cite> can be overridden using the <code>-blockunpaidactionlimit</code> configuration parameter.</p>
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<p><cite>zcashd</cite> v5.5.0 also implemented the change to <a href="#mempool-size-limiting">Mempool size limiting</a> to use the ZIP 317 fee for the low fee penalty threshold, in:</p>
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<ul>
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<li><a href="https://github.com/zcash/zcash/pull/6564">https://github.com/zcash/zcash/pull/6564</a></li>
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</ul>
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<p>As described in section <a href="#transaction-relaying">Transaction relaying</a>, nodes MAY drop transactions with more unpaid actions than a given limit. From <cite>zcashd</cite> v5.6.0, this is controlled by the <code>-txunpaidactionlimit</code> configuration option, which defaults to 50 unpaid actions (the same default as <code>-blockunpaidactionlimit</code>). This behaviour is implemented in:</p>
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<ul>
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<li><a href="https://github.com/zcash/zcash/pull/6646">https://github.com/zcash/zcash/pull/6646</a></li>
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</ul>
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<p>Note that <cite>zcashd</cite> also requires transactions to pay at least a "relay threshold" fee. As part of the ZIP 317 work, this rule was simplified for <cite>zcashd</cite> v5.5.0:</p>
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<ul>
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<li><a href="https://github.com/zcash/zcash/pull/6542/files#diff-34d21af3c614ea3cee120df276c9c4ae95053830d7f1d3deaf009a4625409ad2">https://github.com/zcash/zcash/pull/6542/files#diff-34d21af3c614ea3cee120df276c9c4ae95053830d7f1d3deaf009a4625409ad2</a></li>
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</ul>
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</section>
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<section id="deployment-in-zebra"><h3><span class="section-heading">Deployment in zebra</span><span class="section-anchor"> <a rel="bookmark" href="#deployment-in-zebra"><img width="24" height="24" class="section-anchor" src="assets/images/section-anchor.png" alt=""></a></span></h3>
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<p><cite>zebra</cite> does not provide a wallet, and so does not need to calculate ZIP 317 fees in order to construct transactions.</p>
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<p><cite>zebra</cite> v1.0.0-rc.3 implemented the current <a href="#recommended-algorithm-for-block-template-construction">Recommended algorithm for block template construction</a> in:</p>
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<ul>
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<li><a href="https://github.com/ZcashFoundation/zebra/pull/5724">https://github.com/ZcashFoundation/zebra/pull/5724</a></li>
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<li><a href="https://github.com/ZcashFoundation/zebra/pull/5776">https://github.com/ZcashFoundation/zebra/pull/5776</a> (algorithm update)</li>
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</ul>
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<p><cite>zebra</cite> v1.0.0-rc.2 had implemented an earlier version of this algorithm. The value used for
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<span class="math">\(block\_unpaid\_action\_limit\)</span>
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in <cite>zebra</cite> is not configurable.</p>
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<p><cite>zebra</cite> v1.0.0-rc.2 implemented the change to <a href="#mempool-size-limiting">Mempool size limiting</a> in:</p>
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<ul>
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<li><a href="https://github.com/ZcashFoundation/zebra/pull/5703">https://github.com/ZcashFoundation/zebra/pull/5703</a></li>
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</ul>
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<p><cite>zebra</cite> v1.0.0-rc.8 implemented <a href="#transaction-relaying">Transaction relaying</a> changes in:</p>
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<ul>
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<li><a href="https://github.com/ZcashFoundation/zebra/pull/6556">https://github.com/ZcashFoundation/zebra/pull/6556</a></li>
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</ul>
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<p><cite>zebra</cite> uses a similar relay threshold rule to <cite>zcashd</cite>, but additionally enforces a minimum fee of 100 zatoshis (this differs from <cite>zcashd</cite> only for valid transactions of less than 1000 bytes, assuming that <cite>zcashd</cite> uses its default value for <code>-minrelaytxfee</code>).</p>
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</section>
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</section>
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<section id="considered-alternatives"><h2><span class="section-heading">Considered Alternatives</span><span class="section-anchor"> <a rel="bookmark" href="#considered-alternatives"><img width="24" height="24" class="section-anchor" src="assets/images/section-anchor.png" alt=""></a></span></h2>
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<p>This section describes alternative proposals that have not been adopted.</p>
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@ -426,18 +479,13 @@ Pull-Request: <<a href="https://github.com/zcash/zips/pull/631">https://githu
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threshold. This is no longer expressible with the formula specified above.)</p>
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</section>
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<section id="endorsements"><h2><span class="section-heading">Endorsements</span><span class="section-anchor"> <a rel="bookmark" href="#endorsements"><img width="24" height="24" class="section-anchor" src="assets/images/section-anchor.png" alt=""></a></span></h2>
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<p>The following entities/groups/individuals expressed their support for the updated fee mechanism:</p>
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<p><em>Developer Groups or Sole OSS contributors</em></p>
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<!-- * Zecwallet Suite (Zecwallet Lite for Desktop/iOS/Android & Zecwallet FullNode)
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* Nighthawk Wallet for Android & iOS -->
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<p>To express and request your support to be added to this ZIP please comment below indicating:</p>
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<p>The following entities and developers of the listed software expressed their support for the updated fee mechanism:</p>
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<ul>
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<li>(group) name/pseudonym</li>
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<li>affiliation</li>
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<li>contact</li>
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<li>Zecwallet Suite (Zecwallet Lite for Desktop/iOS/Android & Zecwallet FullNode)</li>
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<li>Nighthawk Wallet for Android & iOS</li>
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<li>Electric Coin Company</li>
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<li>Zcash Foundation</li>
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</ul>
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<p>or, conversely e-mail the same details to the Owner of the ZIP.</p>
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<p>TODO: Endorsements may depend on specific parameter choices. The ZIP Editors should ensure that the endorsements are accurate before marking this ZIP as Active.</p>
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</section>
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<section id="acknowledgements"><h2><span class="section-heading">Acknowledgements</span><span class="section-anchor"> <a rel="bookmark" href="#acknowledgements"><img width="24" height="24" class="section-anchor" src="assets/images/section-anchor.png" alt=""></a></span></h2>
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<p>Thanks to Madars Virza for initially proposing a fee mechanism similar to that proposed in this ZIP <a id="footnote-reference-11" class="footnote_reference" href="#madars-1">5</a>, and for finding a potential weakness in an earlier version of the block template construction algorithm. Thanks also to Kris Nuttycombe, Jack Grigg, Francisco Gindre, Greg Pfeil, Teor, and Deirdre Connolly for reviews and suggested improvements.</p>
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106
zip-0317.rst
106
zip-0317.rst
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@ -8,7 +8,7 @@
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Kris Nuttycombe
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Jack Grigg
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Francisco Gindre
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Status: Draft
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Status: Active
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Category: Standards / Wallet
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Obsoletes: ZIP 313
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Created: 2022-08-15
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@ -252,7 +252,9 @@ other reasons not to do so for robustness or denial-of-service mitigation.
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If a transaction has more than :math:`block\_unpaid\_action\_limit` "unpaid actions"
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as defined by the `Recommended algorithm for block template construction`_,
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it will never be mined by that algorithm. Nodes MAY drop these transactions.
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it will never be mined by that algorithm. Nodes MAY drop these transactions,
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or transactions with more unpaid actions than a configurable limit (see the
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`Deployment`_ section for actual behaviour of node implementations).
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Mempool size limiting
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---------------------
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@ -423,6 +425,80 @@ relaying. These policy changes SHOULD NOT be deployed before the changes
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to block template construction for miners described in the preceding
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paragraph.
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Deployment in zcashd
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--------------------
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`zcashd` v5.5.0 implemented use of ZIP 317 fees by default for its
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internal wallet in the following PRs:
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* https://github.com/zcash/zcash/pull/6527 (fee computation)
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* https://github.com/zcash/zcash/pull/6524 (main implementation)
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* https://github.com/zcash/zcash/pull/6559 (follow-up to #6524)
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* https://github.com/zcash/zcash/pull/6568 (for ``z_shieldcoinbase``)
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* https://github.com/zcash/zcash/pull/6576 (follow-up to #6568)
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* https://github.com/zcash/zcash/pull/6569 (for ``z_mergetoaddress``)
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`zcashd` v5.5.0 implemented the `Recommended algorithm for block template construction`_
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in:
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* https://github.com/zcash/zcash/pull/6460 (preparation)
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* https://github.com/zcash/zcash/pull/6607 (follow-up to #6460)
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* https://github.com/zcash/zcash/pull/6527 (fee computation)
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* https://github.com/zcash/zcash/pull/6564 (block template construction)
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The value used for :math:`block\_unpaid\_action\_limit` by `zcashd`
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can be overridden using the ``-blockunpaidactionlimit`` configuration
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parameter.
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`zcashd` v5.5.0 also implemented the change to `Mempool size limiting`_
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to use the ZIP 317 fee for the low fee penalty threshold, in:
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* https://github.com/zcash/zcash/pull/6564
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As described in section `Transaction relaying`_, nodes MAY drop
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transactions with more unpaid actions than a given limit. From
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`zcashd` v5.6.0, this is controlled by the ``-txunpaidactionlimit``
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configuration option, which defaults to 50 unpaid actions (the
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same default as ``-blockunpaidactionlimit``). This behaviour is
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implemented in:
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* https://github.com/zcash/zcash/pull/6646
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Note that `zcashd` also requires transactions to pay at least a
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"relay threshold" fee. As part of the ZIP 317 work, this rule was
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simplified for `zcashd` v5.5.0:
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* https://github.com/zcash/zcash/pull/6542/files#diff-34d21af3c614ea3cee120df276c9c4ae95053830d7f1d3deaf009a4625409ad2
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Deployment in zebra
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-------------------
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`zebra` does not provide a wallet, and so does not need to calculate
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ZIP 317 fees in order to construct transactions.
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`zebra` v1.0.0-rc.3 implemented the current `Recommended algorithm for
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block template construction`_ in:
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* https://github.com/ZcashFoundation/zebra/pull/5724
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* https://github.com/ZcashFoundation/zebra/pull/5776 (algorithm update)
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`zebra` v1.0.0-rc.2 had implemented an earlier version of this algorithm.
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The value used for :math:`block\_unpaid\_action\_limit` in `zebra` is not
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configurable.
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`zebra` v1.0.0-rc.2 implemented the change to `Mempool size limiting`_ in:
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* https://github.com/ZcashFoundation/zebra/pull/5703
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`zebra` v1.0.0-rc.8 implemented `Transaction relaying`_ changes in:
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* https://github.com/ZcashFoundation/zebra/pull/6556
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`zebra` uses a similar relay threshold rule to `zcashd`, but additionally
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enforces a minimum fee of 100 zatoshis (this differs from `zcashd` only for
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valid transactions of less than 1000 bytes, assuming that `zcashd` uses its
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default value for ``-minrelaytxfee``).
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Considered Alternatives
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=======================
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@ -451,27 +527,13 @@ threshold. This is no longer expressible with the formula specified above.)
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Endorsements
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============
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The following entities/groups/individuals expressed their support for the
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updated fee mechanism:
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The following entities and developers of the listed software expressed their
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support for the updated fee mechanism:
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*Developer Groups or Sole OSS contributors*
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..
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* Zecwallet Suite (Zecwallet Lite for Desktop/iOS/Android & Zecwallet FullNode)
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* Nighthawk Wallet for Android & iOS
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To express and request your support to be added to this ZIP please comment
|
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below indicating:
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* (group) name/pseudonym
|
||||
* affiliation
|
||||
* contact
|
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or, conversely e-mail the same details to the Owner of the ZIP.
|
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TODO: Endorsements may depend on specific parameter choices. The ZIP
|
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Editors should ensure that the endorsements are accurate before marking
|
||||
this ZIP as Active.
|
||||
* Zecwallet Suite (Zecwallet Lite for Desktop/iOS/Android & Zecwallet FullNode)
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* Nighthawk Wallet for Android & iOS
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* Electric Coin Company
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* Zcash Foundation
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Acknowledgements
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