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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">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/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/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/0032-minimal-relay.html">RFC-0032: Minimal Relay</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="spacer"></li><li class="chapter-item expanded affix "><li class="part-title">Newly Proposed</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/0004-remove-unnecessary-allocator-usage.html">RFC-0004: Remove the host-side runtime memory allocator</a></li><li class="chapter-item expanded "><a href="../proposed/0026-sassafras-consensus.html">RFC-0026: Sassafras Consensus Protocol</a></li><li class="chapter-item expanded "><a href="../proposed/0034-xcm-absolute-location-account-derivation.html">RFC-34: XCM Absolute Location Account Derivation</a></li><li class="chapter-item expanded "><a href="../proposed/0042-extrinsics-state-version.html">RFC-0042: Add System version that replaces StateVersion on RuntimeVersion</a></li><li class="chapter-item expanded "><a href="../proposed/0044-rent-based-registration.html">RFC-0044: Rent based registration model</a></li><li class="chapter-item expanded "><a href="../proposed/0046-metadata-for-offline-signers.html">RFC-0000: Metadata for offline signers</a></li><li class="chapter-item expanded "><a href="../proposed/0047-assignment-of-availability-chunks.html">RFC-0047: Assignment of availability chunks to validators</a></li><li class="chapter-item expanded "><a href="../proposed/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="../proposed/0061-allocator-inside-of-runtime.html">RFC-0061: Support allocator inside of runtime</a></li><li class="chapter-item expanded "><a href="../proposed/0062-lowering-existential-deposit-on-assethub.html">RFC-0062: Lowering Existential Deposit on Asset Hub for Polkadot</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/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/000x-assethub.html">RFC-0000: Lowering NFT Deposits on Polkadot and Kusama Asset Hubs</a></li><li class="chapter-item expanded "><a href="../stale/0010-burn-coretime-revenue.html">RFC-0010: Burn Coretime Revenue</a></li><li class="chapter-item expanded "><a href="../stale/0011-add-new-path-to-account-creation-on-asset-hubs.html" class="active">RFC-0011: Add New Path to Account Creation on Asset Hubs</a></li><li class="chapter-item expanded "><a href="../stale/0013-prepare-blockbuilder-and-core-runtime-apis-for-mbms.html">RFC-0013: Prepare BlockBuilder and Core runtime APIs for MBMs</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/0020-treasurer-track-confirmation-period-duration-modification.html">RFC-0020: Treasurer Track Confirmation Period Duration Modification</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/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="../stale/0048-session-keys-runtime-api.html">RFC-0048: Generate ownership proof for SessionKeys</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></ol>
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<p><a href="https://github.com/polkadot-fellows/RFCs/pull/11">(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-0011-add-new-path-to-account-creation-on-asset-hubs">RFC-0011: Add New Path to Account Creation on Asset Hubs</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>
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<ul>
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<li><a href="#requirements">Requirements</a></li>
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</ul>
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</li>
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<li><a href="#stakeholders">Stakeholders</a></li>
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<li><a href="#explanation">Explanation</a></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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<li><a href="#future-directions-and-related-material">Future Directions and Related Material</a></li>
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</ul>
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</li>
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</ul>
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<h1 id="rfc-0011-add-new-path-to-account-creation-on-asset-hubs"><a class="header" href="#rfc-0011-add-new-path-to-account-creation-on-asset-hubs">RFC-0011: Add New Path to Account Creation on Asset Hubs</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>19 July 2023</td></tr>
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<tr><td><strong>Description</strong></td><td>Proposal for a new secure means of creating an account on Asset Hub.</td></tr>
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<tr><td><strong>Authors</strong></td><td>Joe Petrowski</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>The Assets pallet includes a notion of asset "sufficiency". Sufficient assets, when transferred to
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a non-existent account, will provide a sufficient reference that creates the account. That is, the
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asset is <em>sufficient</em> to justify an account's existence, even in lieu of the existential deposit of
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DOT.</p>
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<p>While convenient for sufficient assets, the vast majority of assets are not sufficient. This RFC
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proposes an opt-in means for users to create accounts from non-sufficient assets by swapping a
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portion of the first transfer to acquire the existential deposit of DOT.</p>
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<h2 id="motivation"><a class="header" href="#motivation">Motivation</a></h2>
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<p>The network can make an asset "sufficient" via governance call. However, the network is still
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placing trust in the asset's administrator (which may be a third-party account or a protocol). The
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asset's administrator could mint the asset and create many accounts without paying an adequate
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storage deposit. For this reason, governance has been extremely strict in granting sufficiency, so
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far only doing so to one asset (USDT).</p>
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<p>With the introduction of the Asset Conversion pallet, the Asset Hub can offer a new path to account
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creation. The current paths are:</p>
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<ol>
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<li>An account can have the existential deposit of DOT;</li>
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<li>An account can have the minimum balance of a sufficient asset;</li>
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<li>Someone else can create an account in the context of an asset class by placing a deposit in DOT.
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This path is only available to the asset class's <code>Admin</code> or <code>Freezer</code>.</li>
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</ol>
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<p>This RFC proposes a fourth path that does not introduce prior steps for either the sender or
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receiver of the asset.</p>
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<h3 id="requirements"><a class="header" href="#requirements">Requirements</a></h3>
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<ul>
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<li>The system MUST be secure against economic attacks that allow an attacker to create a virtually
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unlimited number of accounts.</li>
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<li>The system SHOULD allow users to hold and transact in any asset without <em>separately and priorly</em>
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acquiring DOT.</li>
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</ul>
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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>Polkadot users</li>
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<li>Wallet and UI/UX developers</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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<p>By using the Asset Conversion protocol, the system can convert any asset to DOT as long as there is
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a path from that asset to DOT. As such, we can rely on the economic security provided by the
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existential deposit of DOT by simply converting some amount of the asset being transferred to the
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existential deposit.</p>
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<p>This conversion only need happen when the account does not yet exist. When the destination account
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does exist, the full amount of the asset can be transferred. This would mean that only the first
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asset transfer to an account has some amount debited to acquire the DOT to create the account, but
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subsequent transfers would always be in full.</p>
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<p>The main benefit of this approach is that it removes the sender's need to know about the
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desination's existence and the recipient's need to "prepare" an account by endowing it.</p>
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<p>The primary tradeoff, of course, is that transactions like "send 10 USDT" could result in fewer
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than 10 USDT arriving in the destination account. This can be solved by having the conversion be
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opt-in for the sender.</p>
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<p>Because the existential deposit is small (0.1 DOT on Asset Hub), and the user need not interact
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with the DOT in any way -- because transaction fee payment can also be handled via Asset Conversion
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-- many users may find this path convenient in avoiding transfer errors due to non-existent
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accounts or asset insufficiency.</p>
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<p>Stripping out all other asset transfer-associated logic, this RFC proposes the following logic:</p>
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<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>fn transfer(
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origin: OriginFor,
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asset: AssetId,
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destination: AccountId,
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amount: Balance,
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create_destination: bool,
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..
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) -> DispatchResult {
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let from = ensure_signed(origin)?;
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let details = Asset::<T, I>::get(&id).ok_or(Error::<T, I>::Unknown)?;
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if destination.exists() || !create_destination || details.sufficient {
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// Either the destination already exists (holds ED of DOT), the user does not want to create
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// the destination account, or the asset class is sufficient. We can just transfer the
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// asset as normal.
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Self::do_transfer(asset, from, destination, amount, ..)?;
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} else {
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// The destination does not exist and the user has opted in to create it via a swap.
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//
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// We will try to swap the asset provided for the existential deposit, depositing the ED in
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// the destination account. If the asset does not have an Asset Conversion pair with DOT or
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// the asset amount isn't enough to acquire the existential deposit, this will fail. But we
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// generally think (a) pairs will exist, and (b) the ED is small and UIs can easily verify
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// that this should succeed, so failures should be rare.
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//
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// The swap returns the amount of the asset consumed to acquire the ED.
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let consumed = Swap::swap_tokens_for_exact_tokens(
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from, // sender
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vec![asset, dot], // path, where `dot` is Multilocation {parents: 1, interior: Here}
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existential_deposit, // amount_out, we need the ED for the account
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destination, // send_to
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..
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)?;
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// We used some asset for the swap, so we have to subtract that from the amount.
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let remaining_asset_amount = amount.saturating_sub(consumed);
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// Now we transfer whatever amount is left, knowing that the destination account exists.
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// This could still fail if the remaining amount is less than the minimum balance required
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// by the asset class.
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Self::do_transfer(asset, from, destination, remaining_asset_amount, ..)?;
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}
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}
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<span class="boring">}</span></code></pre></pre>
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<h2 id="drawbacks"><a class="header" href="#drawbacks">Drawbacks</a></h2>
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<p>This solution would automatically convert some amount of another asset to DOT when acquiring DOT
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was perhaps not the recipient's intent. However, this is opt-in.</p>
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<h2 id="testing-security-and-privacy"><a class="header" href="#testing-security-and-privacy">Testing, Security, and Privacy</a></h2>
|
|
<p>An attacker that wanted to bloat state by sending worthless assets to many new accounts would need
|
|
to put the DOT into an Asset Conversion pool with the asset (thereby making the asset <em>not</em>
|
|
worthless with respect to DOT). This would provide the same cost and economic security as just
|
|
sending the existential deposit of DOT to all the new accounts. This approach is no less secure
|
|
than the DOT-only existential deposit system.</p>
|
|
<p>This proposal introduces no privacy enhancements or reductions.</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>The function to transfer assets will need to charge a larger weight at dispatch to account for the
|
|
possibility of needing to perform a swap for DOT. It could return any unused weight.</p>
|
|
<p>The implementation could also include witness data as to the destination account's existence so
|
|
that the block builder can appropriately budget for the weight.</p>
|
|
<h3 id="ergonomics"><a class="header" href="#ergonomics">Ergonomics</a></h3>
|
|
<p>This proposal would benefit the ergonomics of the system for end users by allowing all assets to
|
|
create destination accounts when needed.</p>
|
|
<h3 id="compatibility"><a class="header" href="#compatibility">Compatibility</a></h3>
|
|
<p>This change would require changes to the Assets pallet to add the new account creation path.</p>
|
|
<h2 id="prior-art-and-references"><a class="header" href="#prior-art-and-references">Prior Art and References</a></h2>
|
|
<p>Discussions with:</p>
|
|
<ul>
|
|
<li>SR Labs auditors, in particular Jakob Lell and Louis Merlin</li>
|
|
<li>The monthly Asset Conversion ecosystem call, particular inspiration from Jakub Gregus</li>
|
|
</ul>
|
|
<h2 id="unresolved-questions"><a class="header" href="#unresolved-questions">Unresolved Questions</a></h2>
|
|
<p>None at this time.</p>
|
|
<h2 id="future-directions-and-related-material"><a class="header" href="#future-directions-and-related-material">Future Directions and Related Material</a></h2>
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<p>Not applicable.</p>
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