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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../introduction.html">Introduction</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><li class="part-title">Newly Proposed</li><li class="chapter-item expanded "><a href="../new/0126-introduce-xcq.html">RFC-0126: Introduce XCQ(Cross Consensus Query)</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><li class="part-title">Proposed</li><li class="chapter-item expanded "><a href="../proposed/0102-offchain-parachain-runtime-upgrades.html">RFC-0000: Feature Name Here</a></li><li class="chapter-item expanded "><a href="../proposed/0111-pure-proxy-replication.html">RFC-0111: Pure Proxy Replication</a></li><li class="chapter-item expanded "><a href="../proposed/0114-secp256r1-hostfunction.html">RFC-0114: Introduce secp256r1_ecdsa_verify_prehashed Host Function to verify NIST-P256 elliptic curve signatures</a></li><li class="chapter-item expanded "><a href="../proposed/0117-unbrick-collective.html" class="active">RFC-0117: The Unbrick Collective</a></li><li class="chapter-item expanded "><a href="../proposed/0121-iterable-referenda-tracks.html">RFC-0121: Iterable Referenda Tracks</a></li><li class="chapter-item expanded "><a href="../proposed/0123-pending-code-as-storage-location-for-runtime-upgrades.html">RFC-0123: Introduce :pending_code as intermediate storage key for the runtime code</a></li><li class="chapter-item expanded "><a href="../proposed/0124-extrinsic-version-5.html">RFC-0124: Extrinsic version 5</a></li><li class="chapter-item expanded "><a href="../proposed/0125-xcm-asset-metadata.html">RFC-0125: XCM Asset Metadata</a></li><li class="chapter-item expanded "><a href="../proposed/RFC-114 Adjust Tipper Track Confirmation Periods.html">RFC-114: Adjust Tipper Track Confirmation Periods</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><li class="part-title">Approved</li><li class="chapter-item expanded "><a href="../approved/0001-agile-coretime.html">RFC-1: Agile Coretime</a></li><li class="chapter-item expanded "><a href="../approved/0005-coretime-interface.html">RFC-5: Coretime Interface</a></li><li class="chapter-item expanded "><a href="../approved/0007-system-collator-selection.html">RFC-0007: System Collator Selection</a></li><li class="chapter-item expanded "><a href="../approved/0008-parachain-bootnodes-dht.html">RFC-0008: Store parachain bootnodes in relay chain DHT</a></li><li class="chapter-item expanded "><a href="../approved/0010-burn-coretime-revenue.html">RFC-0010: Burn Coretime Revenue</a></li><li class="chapter-item expanded "><a href="../approved/0012-process-for-adding-new-collectives.html">RFC-0012: Process for Adding New System Collectives</a></li><li class="chapter-item expanded "><a href="../approved/0013-prepare-blockbuilder-and-core-runtime-apis-for-mbms.html">RFC-0013: Prepare Core runtime API for MBMs</a></li><li class="chapter-item expanded "><a href="../approved/0014-improve-locking-mechanism-for-parachains.html">RFC-0014: Improve locking mechanism for parachains</a></li><li class="chapter-item expanded "><a href="../approved/0022-adopt-encointer-runtime.html">RFC-0022: Adopt Encointer Runtime</a></li><li class="chapter-item expanded "><a href="../approved/0026-sassafras-consensus.html">RFC-0026: Sassafras Consensus Protocol</a></li><li class="chapter-item expanded "><a href="../approved/0032-minimal-relay.html">RFC-0032: Minimal Relay</a></li><li class="chapter-item expanded "><a href="../approved/0042-extrinsics-state-version.html">RFC-0042: Add System version that replaces StateVersion on RuntimeVersion</a></li><li class="chapter-item expanded "><a href="../approved/0043-storage-proof-size-hostfunction.html">RFC-0043: Introduce storage_proof_size Host Function for Improved Parachain Block Utilization</a></li><li class="chapter-item expanded "><a href="../approved/0045-nft-deposits-asset-hub.html">RFC-0045: Lowering NFT Deposits on Asset Hub</a></li><li class="chapter-item expanded "><a href="../approved/0047-assignment-of-availability-chunks.html">RFC-0047: Assignment of availability chunks to validators</a></li><li class="chapter-item expanded "><a href="../approved/0048-session-keys-runtime-api.html">RFC-0048: Generate ownership proof for SessionKeys</a></li><li class="chapter-item expanded "><a href="../approved/0050-fellowship-salaries.html">RFC-0050: Fellowship Salaries</a></li><li class="chapter-item expanded "><a href="../approved/0056-one-transaction-per-notification.html">RFC-0056: Enforce only one transaction per notification</a></li><li class="chapter-item expanded "><a href="../approved/0059-nodes-capabilities-discovery.html">RFC-0059: Add a discovery mechanism for nodes based on their capabilities</a></li><li class="chapter-item expanded "><a href="../approved/0078-merkleized-metadata.html">RFC-0078: Merkleized Metadata</a></li><li class="chapter-item expanded "><a href="../approved/0084-general-transaction-extrinsic-format.html">RFC-0084: General transactions in extrinsic format</a></li><li class="chapter-item expanded "><a href="../approved/0091-dht-record-creation-time.html">RFC-0091: DHT Authority discovery record creation time</a></li><li class="chapter-item expanded "><a href="../approved/0097-unbonding_queue.html">RFC-0097: Unbonding Queue</a></li><li class="chapter-item expanded "><a href="../approved/0099-transaction-extension-version.html">RFC-0099: Introduce a transaction extension version</a></li><li class="chapter-item expanded "><a href="../approved/0100-xcm-multi-type-asset-transfer.html">RFC-0100: New XCM instruction: InitiateAssetsTransfer</a></li><li class="chapter-item expanded "><a href="../approved/0101-xcm-transact-remove-max-weight-param.html">RFC-0101: XCM Transact remove require_weight_at_most parameter</a></li><li class="chapter-item expanded "><a href="../approved/0103-introduce-core-index-commitment.html">RFC-0103: Introduce a CoreIndex commitment and a SessionIndex field in candidate receipts</a></li><li class="chapter-item expanded "><a href="../approved/0105-xcm-improved-fee-mechanism.html">RFC-0105: XCM improved fee mechanism</a></li><li class="chapter-item expanded "><a href="../approved/0107-xcm-execution-hints.html">RFC-0107: XCM Execution hints</a></li><li class="chapter-item expanded "><a href="../approved/0108-xcm-remove-testnet-ids.html">RFC-0108: Remove XCM testnet NetworkIds</a></li><li class="chapter-item expanded "><a href="../approved/0122-alias-origin-on-asset-transfers.html">RFC-0122: Asset transfers can alias XCM origin on destination to original origin</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><li class="part-title">Stale</li><li class="chapter-item expanded "><a href="../stale/0000-rewards.html">RFC-0000: Validator Rewards</a></li><li class="chapter-item expanded "><a href="../stale/0004-remove-unnecessary-allocator-usage.html">RFC-0004: Remove the host-side runtime memory allocator</a></li><li class="chapter-item expanded "><a href="../stale/0006-dynamic-pricing-for-bulk-coretime-sales.html">RFC-0006: Dynamic Pricing for Bulk Coretime Sales</a></li><li class="chapter-item expanded "><a href="../stale/0009-improved-net-light-client-requests.html">RFC-0009: Improved light client requests networking protocol</a></li><li class="chapter-item expanded "><a href="../stale/0015-market-design-revisit.html">RFC-0015: Market Design Revisit</a></li><li class="chapter-item expanded "><a href="../stale/0034-xcm-absolute-location-account-derivation.html">RFC-34: XCM Absolute Location Account Derivation</a></li><li class="chapter-item expanded "><a href="../stale/0035-conviction-voting-delegation-modifications.html"> RFC-0035: Conviction Voting Delegation Modifications</a></li><li class="chapter-item expanded "><a href="../stale/0044-rent-based-registration.html">RFC-0044: Rent based registration model</a></li><li class="chapter-item expanded "><a href="../stale/0054-remove-heap-pages.html">RFC-0054: Remove the concept of "heap pages" from the client</a></li><li class="chapter-item expanded "><a href="../stale/0070-x-track-kusamanetwork.html">RFC-0070: X Track for @kusamanetwork</a></li><li class="chapter-item expanded "><a href="../stale/0073-referedum-deposit-track.html">RFC-0073: Decision Deposit Referendum Track</a></li><li class="chapter-item expanded "><a href="../stale/0074-stateful-multisig-pallet.html">RFC-0074: Stateful Multisig Pallet</a></li><li class="chapter-item expanded "><a href="../stale/0077-increase-max-length-of-identity-pgp-fingerprint-value.html">RFC-0077: Increase maximum length of identity PGP fingerprint values from 20 bytes</a></li><li class="chapter-item expanded "><a href="../stale/0088-broker-pallet-slashable-deposit-purchaser-reputation-reserved-cores.html">RFC-0088: Add slashable locked deposit, purchaser reputation, and reserved cores for on-chain identities to broker pallet</a></li><li class="chapter-item expanded "><a href="../stale/00xx-secondary-marketplace-for-regions.html">RFC-0001: Secondary Market for Regions</a></li><li class="chapter-item expanded "><a href="../stale/00xx-smart-contracts-coretime-chain.html">RFC-0002: Smart Contracts on the Coretime Chain</a></li><li class="chapter-item expanded "><a href="../stale/0106-xcm-remove-fees-mode.html">RFC-0106: Remove XCM fees mode</a></li><li class="chapter-item expanded "><a href="../stale/0112-compress-state-response-message-in-state-sync.html">RFC-0112: Compress the State Response Message in State Sync</a></li><li class="chapter-item expanded "><a href="../stale/0120-referenda-confirmation-by-candle-mechanism.html">RFC-0120: Referenda Confirmation by Candle Mechanism</a></li><li class="chapter-item expanded "><a href="../stale/TODO-stale-nomination-reward-curve.html">RFC-TODO: Stale Nomination Reward Curve</a></li></ol>
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<h1 class="menu-title">Polkadot Fellowship RFCs</h1>
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<p><a href="https://github.com/polkadot-fellows/RFCs/pull/117">(source)</a></p>
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<p><strong>Table of Contents</strong></p>
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<ul>
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<li><a href="#rfc-0117-the-unbrick-collective">RFC-0117: The Unbrick Collective</a>
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<ul>
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<li><a href="#summary">Summary</a></li>
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<li><a href="#motivation">Motivation</a></li>
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<li><a href="#stakeholders">Stakeholders</a></li>
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<li><a href="#explanation">Explanation</a>
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<ul>
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<li><a href="#the-collective">The Collective</a></li>
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<li><a href="#the-unbrick-process">The Unbrick Process</a></li>
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<li><a href="#belonging-to-the-collective">Belonging to the Collective</a></li>
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</ul>
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</li>
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<li><a href="#drawbacks">Drawbacks</a></li>
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<li><a href="#testing-security-and-privacy">Testing, Security, and Privacy</a></li>
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<li><a href="#performance-ergonomics-and-compatibility">Performance, Ergonomics, and Compatibility</a>
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<ul>
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<li><a href="#performance">Performance</a></li>
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<li><a href="#ergonomics">Ergonomics</a></li>
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<li><a href="#compatibility">Compatibility</a></li>
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</ul>
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</li>
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<li><a href="#prior-art-and-references">Prior Art and References</a></li>
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<li><a href="#unresolved-questions">Unresolved Questions</a></li>
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</ul>
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</li>
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</ul>
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<h1 id="rfc-0117-the-unbrick-collective"><a class="header" href="#rfc-0117-the-unbrick-collective">RFC-0117: The Unbrick Collective</a></h1>
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<div class="table-wrapper"><table><thead><tr><th></th><th></th></tr></thead><tbody>
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<tr><td><strong>Start Date</strong></td><td>22 August 2024</td></tr>
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<tr><td><strong>Description</strong></td><td>The Unbrick Collective aims to help teams rescuing a para once it stops producing blocks</td></tr>
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<tr><td><strong>Authors</strong></td><td>Bryan Chen, Pablo Dorado</td></tr>
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</tbody></table>
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</div>
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<h2 id="summary"><a class="header" href="#summary">Summary</a></h2>
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<p>A followup of the <a href="./0014-improve-locking-mechanism-for-parachains">RFC-0014</a>. This RFC proposes adding a new collective to the Polkadot Collectives
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Chain: The Unbrick Collective, as well as improvements in the mechanisms that will allow teams
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operating paras that had stopped producing blocks to be assisted, in order to restore the production
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of blocks of these paras.</p>
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<h2 id="motivation"><a class="header" href="#motivation">Motivation</a></h2>
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<p>Since the initial launch of Polkadot parachains, there has been many incidients causing parachains
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to stop producing new blocks (therefore, being <em>bricked</em>) and many occurrences that required
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Polkadot governance to update the parachain head state/wasm. This can be due to many reasons range
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from incorrectly registering the initial head state, inability to use sudo key, bad runtime
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migration, bad weight configuration, and bugs in the development of the Polkadot SDK.</p>
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<p>Currently, when the para is not unlocked in the <em>paras registrar</em><sup class="footnote-reference"><a href="#1">1</a></sup>, the <code>Root</code> origin is required to
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perform such actions, involving the governance process to invoke this origin, which can be very
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resource expensive for the teams. The long voting and enactment times also could result significant
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damage to the parachain and users.</p>
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<p>Finally, other instances of governance that might enact a call using the <code>Root</code> origin (like the
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Polkadot Fellowship), due to the nature of their mission, are not fit to carry these kind of tasks.</p>
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<p>In consequence, the idea of a Unbrick Collective that can provide assistance to para teams when
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they brick and further protection against future halts is reasonable enough.</p>
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<h2 id="stakeholders"><a class="header" href="#stakeholders">Stakeholders</a></h2>
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<ul>
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<li>Parachain teams</li>
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<li>Parachain users</li>
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<li>OpenGov users</li>
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<li>Polkadot Fellowship</li>
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</ul>
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<h2 id="explanation"><a class="header" href="#explanation">Explanation</a></h2>
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<h3 id="the-collective"><a class="header" href="#the-collective">The Collective</a></h3>
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<p>The Unbrick Collective is defined as an unranked collective of members, not paid by the Polkadot
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Treasury. Its main goal is to serve as a point of contact and assistance for enacting the actions
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needed to unbrick a para. Such actions are:</p>
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<ul>
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<li>Updating the Parachain Verification Function (a.k.a. a new WASM) of a para.</li>
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<li>Updating the head state of a para.</li>
|
|
<li>A combination of the above.</li>
|
|
</ul>
|
|
<p>In order to ensure these changes are safe enough for the network, actions enacted by the Unbrick
|
|
Collective must be whitelisted via similar mechanisms followed by collectives like the Polkadot
|
|
Fellowship. This will prevent unintended, not overseen changes on other paras to occur.</p>
|
|
<p>Also, teams might opt-in to delegate handling their para in the registry to the Collective. This
|
|
allows to perform similar actions using the <em>paras registrar</em>, allowing for a shorter path to unbrick a
|
|
para.</p>
|
|
<p>Initially, the unbrick collective has powers similar to a parachains own sudo, but permits more
|
|
decentralized control. In the future, Polkadot shall provide functionality like SPREE or JAM that
|
|
exceeds sudo permissions, so the unbrick collective cannot modify those state roots or code.</p>
|
|
<h3 id="the-unbrick-process"><a class="header" href="#the-unbrick-process">The Unbrick Process</a></h3>
|
|
<pre><code class="language-mermaid">flowchart TD
|
|
A[Start]
|
|
|
|
A -- Bricked --> C[Request para unlock via Root]
|
|
C -- Approved --> Y
|
|
C -- Rejected --> A
|
|
|
|
D[unbrick call proposal on WhitelistedUnbrickCaller]
|
|
E[whitelist call proposal on the Unbrick governance]
|
|
E -- call whitelisted --> F[unbrick call enacted]
|
|
D -- unbrick called --> F
|
|
F --> Y
|
|
|
|
A -- Not bricked --> O[Opt-in to the Collective]
|
|
O -- Bricked --> D
|
|
O -- Bricked --> E
|
|
|
|
Y[update PVF / head state] -- Unbricked --> Z[End]
|
|
</code></pre>
|
|
<p>Initially, a para team has two paths to handle a potential unbrick of their para in the case it
|
|
stops producing blocks.</p>
|
|
<ol>
|
|
<li><strong>Opt-in to the Unbrick Collective</strong>: This is done by delegating the handling of the para
|
|
in the <em>paras registrar</em> to an origin related to the Collective. This doesn't require unlocking
|
|
the para. This way, the collective is enabled to perform changes in the <em>paras</em> module, after
|
|
the <strong>Unbrick Process</strong> proceeds.</li>
|
|
<li><strong>Request a Para Unlock</strong>: In case the para hasn't delegated its handling in the <em>paras
|
|
registrar</em>, it'll be still possible for the para team to submit a proposal to unlock the para,
|
|
which can be assisted by the Collective. However, this involves submitting a proposal to the <code>Root</code>
|
|
governance origin.</li>
|
|
</ol>
|
|
<h3 id="belonging-to-the-collective"><a class="header" href="#belonging-to-the-collective">Belonging to the Collective</a></h3>
|
|
<p>The collective will be initially created without members (no seeding). There will be additional
|
|
governance proposals to setup the seed members.</p>
|
|
<p>The origins able to modify the members of the collective are:</p>
|
|
<ul>
|
|
<li>The <code>Fellows</code> track in the Polkadot Fellowship.</li>
|
|
<li><code>Root</code> track in the Relay.</li>
|
|
<li>More than two thirds of the existing Unbrick Collective.</li>
|
|
</ul>
|
|
<p>The members are responsible to verify the technical details of the unbrick requests (i.e. the hash
|
|
of the new PVF being set). Therefore, they must have the technical capacity to perform such tasks.</p>
|
|
<p>Suggested requirements to become a member are the following:</p>
|
|
<ul>
|
|
<li>Rank 3 or above in the Polkadot Fellowship.</li>
|
|
<li>Being a CTO or Technical Lead in a para team that has opted-in to delegate the Unbrick Collective
|
|
to manage the PVF/head state of the para.</li>
|
|
</ul>
|
|
<h2 id="drawbacks"><a class="header" href="#drawbacks">Drawbacks</a></h2>
|
|
<p>The ability to modify the Head State and/or the PVF of a para means a possibility to perform
|
|
arbitrary modifications of it (i.e. take control the native parachain token or any bridged assets
|
|
in the para).</p>
|
|
<p>This could introduce a new attack vector, and therefore, such great power needs to be handled
|
|
carefully.</p>
|
|
<h2 id="testing-security-and-privacy"><a class="header" href="#testing-security-and-privacy">Testing, Security, and Privacy</a></h2>
|
|
<p>The implementation of this RFC will be tested on testnets (Rococo and Westend) first.</p>
|
|
<p>An audit will be required to ensure the implementation doesn't introduce unwanted side effects.</p>
|
|
<p>There are no privacy related concerns.</p>
|
|
<h2 id="performance-ergonomics-and-compatibility"><a class="header" href="#performance-ergonomics-and-compatibility">Performance, Ergonomics, and Compatibility</a></h2>
|
|
<h3 id="performance"><a class="header" href="#performance">Performance</a></h3>
|
|
<p>This RFC should not introduce any performance impact.</p>
|
|
<h3 id="ergonomics"><a class="header" href="#ergonomics">Ergonomics</a></h3>
|
|
<p>This RFC should improve the experience for new and existing parachain teams, lowering the barrier
|
|
to unbrick a stalled para.</p>
|
|
<h3 id="compatibility"><a class="header" href="#compatibility">Compatibility</a></h3>
|
|
<p>This RFC is fully compatible with existing interfaces.</p>
|
|
<h2 id="prior-art-and-references"><a class="header" href="#prior-art-and-references">Prior Art and References</a></h2>
|
|
<ul>
|
|
<li><a href="./0014-improve-locking-mechanism-for-parachains">RFC-0014: Improve Locking Mechanisms for Parachains</a></li>
|
|
<li><a href="https://forum.polkadot.network/t/how-to-recover-a-parachain/673">How to Recover a Parachain, Polkadot Forum</a></li>
|
|
<li><a href="https://forum.polkadot.network/t/unbrick-collective/6931">Unbrick Collective, Polkadot Forum</a></li>
|
|
</ul>
|
|
<h2 id="unresolved-questions"><a class="header" href="#unresolved-questions">Unresolved Questions</a></h2>
|
|
<ul>
|
|
<li>What are the parameters for the <code>WhitelistedUnbrickCaller</code> track?</li>
|
|
<li>Any other methods that shall be updated to accept <code>Unbrick</code> origin?</li>
|
|
<li>Any other requirements to become a member?</li>
|
|
<li>We would like to keep this simple, so no funding support from the Polkadot treasury. But do we
|
|
want to compensate the members somehow? i.e. Allow parachain teams to donate to the collective.</li>
|
|
<li>We hope SPREE/JAM would be carefully audited for miss-use risks before being<br />
|
|
provided to parachain teams, but could the unbrick collective have an elections<br />
|
|
that warranted trust beyond sudo powers?</li>
|
|
<li>An auditing framework/collective makes sense parachain code upgrades, but<br />
|
|
could also strengthen the unbrick collective.</li>
|
|
<li>Do we want to have this collective offer additional technical support to help bricked parachains?
|
|
i.e. help debug the code, create the rescue plan, create postmortem report, provide resources on
|
|
how to avoid getting bricked</li>
|
|
</ul>
|
|
<!-- Footnotes -->
|
|
<div class="footnote-definition" id="1"><sup class="footnote-definition-label">1</sup>
|
|
<p>The <em>paras registrar</em> refers to a pallet in the Relay, responsible to gather registration info
|
|
of the paras, the locked/unlocked state, and the manager info.</p>
|
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