<h1>Brave x Polkadot Wallet Integration Proposal</h1>
<p>Updated: 2/20/25</p>
<h2>Summary of Changes Made</h2>
<ul>
<li>Clarified <strong>Smoldot integration, SCALE codec, and Substrate transaction handling</strong> in the milestones.</li>
<li>Expanded <strong>User Interface and Experience</strong> section to highlight how Polkadot and Kusama will be integrated into Brave Wallet.</li>
<li>Emphasized <strong>Brave&rsquo;s C++ security model</strong>, including process isolation for vulnerable components.</li>
<li>Strengthened <strong>investment justification</strong> by detailing why Brave must port JavaScript-based functionalities into C++.</li>
<li>Updated <strong>open-source commitment</strong> to confirm that Brave will release all Polkadot-related code.</li>
<li>Added <strong>Brave&rsquo;s $100K ad credit</strong> to Polkadot upon proposal approval.</li>
</ul>
<h2><strong>Executive Summary</strong></h2>
<p>This proposal outlines the <strong>native integration of Polkadot functionality into Brave&rsquo;s self-custody wallet</strong>, granting <strong>Brave&rsquo;s 80M+ monthly active users</strong> direct access to the <strong>Polkadot and Kusama ecosystems</strong>. This integration will be implemented <strong>natively in Brave&rsquo;s core C++ architecture</strong> over <strong>12 months</strong>, ensuring <strong>maximum security, privacy, and performance</strong>, while also committing to a <strong>24-month maintenance period</strong> for ongoing updates and optimizations.</p>
<h2><strong>Market Opportunity &amp; Impact</strong></h2>
<p>Brave's extensive user base provides a significant opportunity for Polkadot adoption:</p>
<ul>
<li><strong>80M monthly active users</strong></li>
<li><strong>34.71M daily active users</strong></li>
<li><strong>20.8M potential developers (25% of the user base)</strong></li>
<li><strong>Strong crypto adoption (60% involved in staking, 20% own NFTs)</strong></li>
</ul>
<p>By integrating <strong>Polkadot natively</strong>, Brave Wallet will streamline user access to <strong>Web3</strong>, facilitating <strong>secure XCM-based cross-chain transfers, governance participation, and direct dApp interactions</strong>.</p>
<hr />
<h2><strong>Value Proposition &amp; Investment Request</strong></h2>
<ul>
<li><strong>Total Investment:</strong> $3,000,000 USDC</li>
<li><strong>Development Timeline:</strong> 12 months</li>
<li><strong>Maintenance Period:</strong> 24 months</li>
<li><strong>Total Commitment:</strong> 36 months</li>
</ul>
<h3><strong>Development Milestones &amp; Deliverables</strong></h3>
<h4><strong>Milestone 1: Research &amp; Polkadot HD Keyring&nbsp;</strong></h4>
<ul>
<li>Polkadot BraveWallet integration UX research.</li>
<li>Polkadot HD Keyring support.</li>
<li>Polkadot\Kusama account creation, ss58 address space support.</li>
<li>BraveWallet architecture adoption to support parachain network layer abstraction.</li>
<li>Security audit.</li>
</ul>
<h4><strong>Milestone 2: Relay chains support&nbsp;</strong></h4>
<ul>
<li>Smoldot integration\implementation over Chromium network stack. Own implementation may be required.</li>
<li>SCALE codec integration\implementation. Own implementation may be required.</li>
<li>Substrate transaction creation and signing implementation.</li>
<li>Balance pallet integration.</li>
<li>Relay chain native tokens support: balance resolution, transaction creation, fee calculation, recipient validation, transaction signing&amp;posting flow, transaction status subscription, blockexplorer integration.</li>
<li>Security audit.</li>
<li>QA.</li>
</ul>
<h4><strong>Milestone 3: Network &amp; Parachains support&nbsp;</strong></h4>
<ul>
<li>Parachains metadata fetching, parsing and compatibility verification.</li>
<li>Substrate Parachains integration into the wallet flow(top 5-10 parachains): supported parachains list, account details page, settings, portfolio, send screen, transaction details, recipient list integration.</li>
<li>Most used pallets support - assets, balances, nfts.</li>
<li>Security audit.</li>
<li>QA.</li>
</ul>
<h4><strong>Milestone 4: Assets support</strong></h4>
<ul>
<li>EVM based parachains integration based on existing BraveWallet codebase.</li>
<li>Cross-chain tokens support - cross-chain transactions.</li>
<li>Implement native support of bridges between Brave Wallet supported blockchains and Polkadot.</li>
<li>Security audit.</li>
<li>QA.</li>
</ul>
<h4><strong>Milestone 5: Ecosystem Integration &amp; Deployment&nbsp;</strong></h4>
<ul>
<li>dApps connection support using native C++ implementation of window.polkadot.</li>
<li>Ledger support - import account, sign transactions.</li>
<li>Security audit.</li>
<li>QA.</li>
</ul>
<hr />
<h2><strong>Technical Architecture Overview</strong></h2>
<h3><strong>Core Implementation Strategy</strong></h3>
<ul>
<li><strong>Native C++ integration in Brave&rsquo;s core (No JavaScript dependencies)</strong></li>
<li><strong>Custom Polkadot HD Keyring implementation.</strong></li>
<li><strong>Custom transaction creation and signing component.</strong></li>
<li><strong>Dynamic metadata retrieval</strong> to support Polkadot&rsquo;s runtime upgrade model</li>
<li><strong>Smoldot-based RPC connectivity over Chromium network stack</strong> for decentralized network access</li>
<li><strong>Process isolation</strong> for potential vulnerable parts of code</li>
</ul>
<h3><strong>Polkadot-Specific Integration</strong></h3>
<ul>
<li><strong>EVM and Substrate based parachains integration.</strong></li>
<li><strong>Support for Polkadot and Kusama parachain assets &amp; XCM transactions</strong></li>
<li><strong>Automated runtime metadata updates</strong> for compatibility with evolving networks</li>
<li><strong>Secure <code>window.polkadot</code> provider in C++</strong> for efficient dApp connectivity</li>
</ul>
<hr />
<h3><strong>User Interface and Experience</strong></h3>
<p>The screenshots below illustrate the <strong>current state of Brave Wallet&rsquo;s account creation, hardware wallet import, and network selection interfaces</strong>. These images provide insight into how <strong>Polkadot will be incorporated</strong> into Brave Wallet&rsquo;s multi-chain experience.</p>
<ol>
<li><strong>Account Creation &amp; Import</strong>: Users can create and manage accounts for various blockchains, including Ethereum, Solana, Bitcoin, and Filecoin. With this integration, <strong>Polkadot and Kusama will be added to this interface</strong>, allowing users to create and manage DOT and KSM accounts directly within Brave Wallet.</li>
<li><strong>Hardware Wallet Support</strong>: Brave Wallet enables users to <strong>connect hardware wallets</strong> to manage their crypto securely. <strong>Polkadot Ledger support</strong> will be introduced, allowing users to store and transact with DOT and parachain assets securely.</li>
<li><strong>Network Selection</strong>: Users currently choose from a variety of networks, such as Ethereum, Solana, and Bitcoin. <strong>Polkadot and Kusama will be integrated as primary networks</strong>, ensuring that users can interact with the Polkadot ecosystem natively without needing external extensions.</li>
</ol>
<h3><strong>Where Polkadot Will Be Featured</strong></h3>
<ul>
<li><strong>Polkadot and Kusama will be available in the &ldquo;Create Account&rdquo; and &ldquo;Import from Hardware Wallet&rdquo; sections</strong> of Brave Wallet.</li>
<li><strong>DOT and KSM will be added to the &ldquo;Select Networks&rdquo; menu</strong>, allowing users to toggle between multiple blockchain ecosystems.</li>
<li><strong>XCM-based cross-chain functionality will be incorporated</strong>, enabling users to move assets between Polkadot parachains directly through Brave Wallet.</li>
<li><strong>Polkadot governance and staking will be integrated</strong>, allowing users to participate in Polkadot&rsquo;s decentralized governance directly from Brave.</li>
</ul>
<p>These updates ensure that <strong>Brave Wallet becomes a true multi-chain platform</strong>, where Polkadot users can interact with the ecosystem.</p>
<h2><strong><img src="https://i.ibb.co/C59XrJHN/Screenshot-2025-02-20-at-9-57-00-AM.png" alt /></strong></h2>
<h2><strong><img src="https://i.ibb.co/p6XHfRxd/Screenshot-2025-02-20-at-9-57-14-AM.png" alt /></strong></h2>
<h2><strong><img src="https://i.ibb.co/VcJGyg2m/Screenshot-2025-02-20-at-9-58-06-AM.png" alt width="640" height="288" /></strong></h2>
<h2><strong>Success Metrics &amp; Justification for $3M Investment</strong></h2>
<h3><strong>Technical KPIs</strong></h3>
<ul>
<li><strong>99.9% wallet uptime</strong></li>
<li><strong>&lt;3 second transaction processing</strong></li>
<li><strong>Zero critical security incidents</strong></li>
<li><strong>100% parachain compatibility</strong></li>
<li><strong>Cross-chain transaction success rate exceeding 99%</strong></li>
</ul>
<h3><strong>Investment Justification</strong></h3>
<ul>
<li><strong>Brave&rsquo;s security model requires all network interactions, signing, and chain logic to be implemented in C++ instead of JavaScript-based solutions.</strong></li>
<li><strong>Comprehensive security reviews and dependency audits increase development costs.</strong></li>
<li><strong>Brave must port key functionalities from JavaScript libraries into C++ to meet privacy and security requirements.</strong></li>
<li><strong>The code must be integrated into the Chromium and Brave Wallet codebases, considering their limitations and established patterns.</strong></li>
<li><strong>A long-term commitment (24 months of maintenance) ensures continuous support, updates, and ecosystem stability.</strong></li>
</ul>
<hr />
<h2><strong>Open Source &amp; Long-Term Commitment</strong></h2>
<ul>
<li><strong>Brave will open-source all code related to the Polkadot integration.</strong></li>
<li><strong>24-month maintenance commitment includes security patches, feature updates, and long-term support.</strong></li>
<li><strong>Brave Ads will be leveraged to drive awareness and adoption of Polkadot&rsquo;s integration. Upon approval of this proposal, Brave wll grant a $100k ad credit to Polkadot and its ecosystem.</strong></li>
</ul>
<hr />
<h2><strong>Conclusion</strong></h2>
<p>This integration represents a <strong>significant milestone for Polkadot adoption</strong>, onboarding <strong>millions of new users</strong> through <strong>Brave's privacy-first, security-focused browser environment</strong>. By implementing a <strong>fully native, high-performance C++ integration</strong>, Brave Wallet will serve as a <strong>gateway to Web3</strong>, enabling <strong>cross-parachain transactions, and dApp interactions&mdash;all without requiring third-party extensions.</strong> Brave Wallet supports multiple blockchains, including ETH, BTC, SOL, ZEC, and FIL, enabling seamless <strong>native cross-integration with the Polkadot ecosystem.</strong></p>
<p>This proposal ensures <strong>long-term ecosystem growth, open-source contributions, and measurable adoption metrics</strong>, making it a <strong>strategic win for both Brave and Polkadot.</strong></p>
<h1>About us</h1>
<p><a href="https://brave.com/">Brave</a> is a privacy-focused browser and search engine committed to empowering users with control over their online data and experiences. Our integrated <a href="https://brave.com/wallet/">Brave Wallet</a> provides a seamless way to access Web3 with support for Ethereum, EVM chains, Solana, Bitcoin, and NFTs - no extensions required. Brave Rewards, our privacy-preserving ad platform, has the most crypto-centric audience available today.</p>
<p>Founded by JavaScript creator <a href="https://x.com/BrendanEich">Brendan Eich</a>, Brave is an open-source project fostering innovation through transparency and collaboration. The key team members involved in this proposal are:</p>
<ul>
<li>Carlos Acevedo &mdash;&nbsp; Senior Director, Business Development &mdash; <a href="https://x.com/_CarlosAce_">X</a>, <a href="https://www.linkedin.com/in/clacevedo/">LinkedIn</a></li>
<li>James Mudgett &mdash; VP, iOS, Web 3 &mdash; <a href="https://x.com/jamesmudgett">X</a>, <a href="https://www.linkedin.com/in/jamesmudgett/">LinkedIn</a></li>
<li>Oleg Isupov &mdash; Brave Wallet &mdash; X, <a href="https://www.linkedin.com/in/oleg-i-02845894/">LinkedIn</a></li>
<li>Luke Mulks &mdash;&nbsp; VP, Business Operations &mdash; <a href="https://x.com/lukemulks">X</a>, <a href="https://www.linkedin.com/in/pureproductions/">LinkedIn</a></li>
<li>Angelina Kraminkina &mdash;&nbsp; Senior Client Success Manager, Enterprise &mdash; <a href="https://x.com/lina_kram">X</a>, <a href="https://www.linkedin.com/in/angelina-kraminkina/">LinkedIn</a></li>
</ul>
<p>Major brands across industries have trusted our advertising platforms, including Verizon, Ford, Lufthansa, Crocs, Venom, Mayfair, eToro, Crypto.com, Solana, Upland, Near, and Nexo.</p>
<p>With privacy at its core, Brave aims to improve the way we interact with both Web 2.0 and Web3.</p>

Propose and approve a spend of treasury funds.

## Dispatch Origin

Must be [`Config::SpendOrigin`] with the `Success` value being at least
`amount` of `asset_kind` in the native asset. The amount of `asset_kind` is converted
for assertion using the [`Config::BalanceConverter`].

## Details

Create an approved spend for transferring a specific `amount` of `asset_kind` to a
designated beneficiary. The spend must be claimed using the `payout` dispatchable within
the [`Config::PayoutPeriod`].

### Parameters
- `asset_kind`: An indicator of the specific asset class to be spent.
- `amount`: The amount to be transferred from the treasury to the `beneficiary`.
- `beneficiary`: The beneficiary of the spend.
- `valid_from`: The block number from which the spend can be claimed. It can refer to
  the past if the resulting spend has not yet expired according to the
  [`Config::PayoutPeriod`]. If `None`, the spend can be claimed immediately after
  approval.

## Events

Emits [`Event::AssetSpendApproved`] if successful.

- **Problem Statement & Audience:** Integrating Polkadot into Brave's self-custody wallet to provide 80M+ users access to Polkadot and Kusama ecosystems.
- **Significance:** Enhancing security, privacy, and performance for users, streamlining Web3 access, and enabling cross-chain transfers and governance participation.
- **Proposed Solution:** Native integration in Brave's C++ architecture over 12 months with a 24-month maintenance commitment.
- **Expected Outcomes:** Increased Polkadot adoption, improved user experience, and long-term ecosystem growth through open-source contributions and measurable adoption metrics.

#1412 Polkadot + Brave Wallet: Driving Adoption Through Native Integration

No Active Proposals