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<!DOCTYPE html>
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<title> Nethereum</title>
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<a class='navbar-brand' href='/'>NETHEREUM</a>
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<li class="active"><a href="#" data-nav-section="home"><span>Home</span></a></li>
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<li><a class="external" href="http://playground.nethereum.com" target="_blank" rel="noopener"><span>Playground</span></a></li>
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<h1 class="to-animate small">Bringing the love of .NET to Ethereum and viceversa</h1>
<h2 class="to-animate subtitle small">The Ethereum development platform for the .NET ecosystem — providing libraries and developer infrastructure for smart contracts, wallets, indexing, developer tooling, and blockchain applications.</h2>
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<h2>Complete Development Stack</h2>
<p>130+ NuGet packages covering smart contracts, EVM simulation, DevChain, code generation, blockchain indexing, account abstraction, DeFi protocols, wallet SDKs, and more. Everything you need in one ecosystem.</p>
<p><a href="#fh5co-getstarted" class="btn btn-primary">Get Started</a></p>
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<h2>Every Platform</h2>
<p>From netstandard 2.0 to .NET 10. Build with Blazor, MAUI, Avalonia, Unity, WebAssembly, or console apps. Write once in C# or F# and deploy on Windows, Linux, macOS, Android, iOS, and game consoles.</p>
<p><a href="#fh5co-examples" class="btn btn-primary">View Examples</a></p>
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<h2>Production Ready</h2>
<p>ERC-4337 account abstraction bundler, Blazor blockchain explorer, MUD framework indexer, AppChains with sequencer and RocksDB, x402 crypto payments, Uniswap integration, and Gnosis Safe multi-sig support.</p>
<p><a href="#fh5co-contact" class="btn btn-primary">Get in Touch</a></p>
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<h2>Nethereum makes it easy for .NET applications to use Ethereum,</br> and for Ethereum applications to leverage .NET.</h2>
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<h2 class=" left-border to-animate">.NET Developer Experience</h2>
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<h3>Developers shouldn’t have to change their preferred development environment to work with Ethereum. We’ve built open source tools for you to start leveraging blockchain technology right away.</h3>
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<h3>Simple Path First</h3>
<p><code>web3.Eth</code> handles gas estimation, nonce management, and EIP-1559 fees automatically. One line to query a balance, one line to send a transaction. Expanding the Ethereum ecosystem beyond JavaScript — <a href="https://github.com/Nethereum/NethereumFSharpSample">F#</a> and VB are also supported.</p>
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<h3>100+ Guides</h3>
<p><a href="https://docs.nethereum.com">docs.nethereum.com</a> covers everything from balance queries to running an ERC-4337 bundler, with guides organised by what you want to do. Start developing without a deep blockchain background.</p>
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<h3>Local Dev Chain</h3>
<p><code>dotnet new nethereum-devchain</code> gives you an Aspire-orchestrated dev environment: DevChain node, PostgreSQL database, blockchain indexer, and Blazor explorer — all wired with service discovery and health checks.</p>
</div>
<div class="clearfix visible-sm-block"></div>
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<i class="icon to-animate-2 icon-monitor"></i>
<h3>Code Generation</h3>
<p>Generate typed C# contract services from Solidity ABI using the <a href="https://marketplace.visualstudio.com/items?itemName=JuanBlanco.solidity">VS Code Solidity extension</a>, the CLI tool (<code>Nethereum.Generator.Console</code>), or MSBuild auto-generation on build.</p>
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Connect to any Ethereum or EVM-compatible chain, or run your own with <a href="https://docs.nethereum.com/docs/devchain/overview">DevChain</a>. Use <a href="https://infura.io">Infura</a>, <a href="https://geth.ethereum.org/downloads/">Geth</a>, or any JSON-RPC endpoint. No external dependencies required.
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</section>
<section id="fh5co-overview" data-section="overview">
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<h2 class="to-animate">What You Can Build</h2>
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<p>Nethereum includes 130+ packages organised into focused libraries. Every section links to guides on <a href="https://docs.nethereum.com/docs/what-do-you-want-to-do">docs.nethereum.com</a>.</p>
</div>
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<h3><a href="https://docs.nethereum.com/docs/core-foundation/overview">Core Foundation</a></h3>
<p>Send ETH, query balances, decode transactions, ABI encoding, EIP-1559 fees, EIP-7702 delegation, real-time streaming.</p>
</div>
<div class="col-md-6 col-sm-6 fh5co-service to-animate">
<h3><a href="https://docs.nethereum.com/docs/smart-contracts/overview">Smart Contracts</a></h3>
<p>Deploy, call, and interact with contracts. Code generation from ABI, events, multicall, CREATE2, built-in ERC standards.</p>
</div>
<div class="col-md-6 col-sm-6 fh5co-service to-animate">
<h3><a href="https://docs.nethereum.com/docs/evm-simulator/overview">EVM Simulator</a></h3>
<p>Simulate transactions in-process, preview state changes, step-through debug, decode nested call trees, disassemble bytecode.</p>
</div>
<div class="col-md-6 col-sm-6 fh5co-service to-animate">
<h3><a href="https://docs.nethereum.com/docs/devchain/overview">DevChain</a></h3>
<p>Local Ethereum node in .NET — no external dependencies. Fork live networks, trace transactions, integrate with .NET Aspire.</p>
</div>
<div class="col-md-6 col-sm-6 fh5co-service to-animate">
<h3><a href="https://docs.nethereum.com/docs/account-abstraction/overview">Account Abstraction</a></h3>
<p>ERC-4337 bundler, smart account deployment, ERC-7579 modular accounts, paymasters, session keys, batch operations.</p>
</div>
<div class="col-md-6 col-sm-6 fh5co-service to-animate">
<h3><a href="https://docs.nethereum.com/docs/data-and-indexing/overview">Data, Indexing & Explorer</a></h3>
<p>Index to PostgreSQL/SQL Server/SQLite, token indexing, Blazor blockchain explorer with ABI decoding and contract interaction.</p>
</div>
<div class="col-md-6 col-sm-6 fh5co-service to-animate">
<h3><a href="https://docs.nethereum.com/docs/defi/overview">DeFi & Protocols</a></h3>
<p>Uniswap V2/V3/V4 swaps, Gnosis Safe multi-sig, x402 crypto payments, Permit2, SIWE authentication, Circles UBI.</p>
</div>
<div class="col-md-6 col-sm-6 fh5co-service to-animate">
<h3><a href="https://docs.nethereum.com/docs/mud-framework/overview">MUD Framework</a></h3>
<p>Read, write, and query MUD table records. Index Store events to PostgreSQL. Deploy MUD Worlds with tables and systems.</p>
</div>
<div class="col-md-6 col-sm-6 fh5co-service to-animate">
<h3><a href="https://docs.nethereum.com/docs/wallet-sdk/overview">Wallet SDK</a></h3>
<p>Multi-platform wallet apps with Blazor, MAUI, and Avalonia. MVVM architecture, hardware wallet support, EVM simulation preview.</p>
</div>
<div class="col-md-6 col-sm-6 fh5co-service to-animate">
<h3><a href="https://docs.nethereum.com/docs/blazor-dapp-integration/overview">Blazor dApp Integration</a></h3>
<p>Connect browser wallets (EIP-6963), MetaMask, WalletConnect. SIWE authentication. Dynamic contract interaction without codegen.</p>
</div>
<div class="col-md-6 col-sm-6 fh5co-service to-animate">
<h3><a href="https://docs.nethereum.com/docs/unity/overview">Unity</a></h3>
<p>Ethereum integration for Unity games. WebGL wallet support, EIP-6963, smart contract interaction, cross-platform deployment.</p>
</div>
<div class="col-md-6 col-sm-6 fh5co-service to-animate">
<h3><a href="https://docs.nethereum.com/docs/application-chain/overview">AppChains (Preview)</a></h3>
<p>Custom application chains with sequencer, RocksDB storage, multi-peer sync, L1 anchoring, and follower node verification.</p>
</div>
</div>
<div class="row text-center fh5co-overview-footer to-animate">
<p>For the full list of 100+ use cases, see <a href="https://docs.nethereum.com/docs/what-do-you-want-to-do">What Do You Want to Do?</a> on the documentation site.</p>
</div>
</div>
</section>
<section id="fh5co-getstarted" data-section="getstarted">
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<h2 class="to-animate">Get Started</h2>
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<h3>Focus on building. Nethereum provides a suite of open source libraries to help you start prototyping Ethereum applications in .NET quickly.</h3>
</div>
</div>
</div>
</div>
<div class="row row-bottom-padded-sm">
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<img src="images/walletsdk-portfolio.png" alt="Quick Start Guide" class="img-responsive work-img" />
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<h2>Quick Start Guide</h2>
<span>Your first Nethereum project in minutes</span>
</div>
</a>
</div>
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<img src="images/codegen.png" alt="Nethereum Playground" class="img-responsive work-img" />
<div class="fh5co-text">
<h2>Playground</h2>
<span>Try Nethereum in your browser — no setup</span>
</div>
</a>
</div>
<div class="clearfix visible-sm-block"></div>
<div class="col-md-4 col-sm-12">
<a href="https://docs.nethereum.com/docs/smart-contracts/code-generation" class="fh5co-project-item to-animate" target="_blank" rel="noopener">
<img src="images/codegen.png" alt="Code Generation from Solidity in VS Code" class="img-responsive work-img" />
<div class="fh5co-text">
<h2>Code Generation & Templates</h2>
<span>dotnet new smartcontract, nethereum-devchain</span>
</div>
</a>
</div>
<div class="clearfix visible-sm-block"></div>
<div class="col-md-4 col-sm-12">
<a href="https://docs.nethereum.com/docs/data-and-indexing/guide-explorer" class="fh5co-project-item to-animate" target="_blank" rel="noopener">
<img src="images/explorer-dashboard.png" alt="Blockchain Explorer" class="img-responsive work-img" />
<div class="fh5co-text">
<h2>Blockchain Explorer</h2>
<span>Full Blazor explorer with ABI decoding, contract interaction, and EVM debugger</span>
</div>
</a>
</div>
<div class="clearfix visible-sm-block"></div>
<div class="col-md-4 col-sm-12">
<a href="https://docs.nethereum.com/docs/unity/overview" class="fh5co-project-item to-animate" target="_blank" rel="noopener">
<img src="images/unity-game.png" alt="Unity Integration" class="img-responsive work-img" />
<div class="fh5co-text">
<h2>Unity Integration</h2>
<span>Build blockchain games with Unity3d</span>
</div>
</a>
</div>
<div class="clearfix visible-sm-block"></div>
<div class="col-md-4 col-sm-12">
<a href="https://docs.nethereum.com/docs/what-do-you-want-to-do" class="fh5co-project-item to-animate" target="_blank" rel="noopener">
<img src="images/walletsdk-evm-decoding.png" alt="What Do You Want to Do?" class="img-responsive work-img" />
<div class="fh5co-text">
<h2>What Do You Want to Do?</h2>
<span>Find the right guide for your task</span>
</div>
</a>
</div>
<div class="clearfix visible-sm-block"></div>
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<p>Head over to the <a href="https://github.com/Nethereum">Nethereum Github</a> or the <a href="https://docs.nethereum.com">Docs</a> for more templates, utilities and a tour of .NET ecosystem examples</p>
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<h2 class="to-animate">See It In Action</h2>
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<h3>From EVM simulation and transaction decoding to cross-chain portfolio management — see what Nethereum looks like in production.</h3>
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<!-- 1. INFRA: Aspire orchestration -->
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<h3 class="slide-title">.NET Aspire DevChain</h3>
<p class="slide-summary">One command gives you a complete Ethereum dev environment: <code>dotnet new nethereum-devchain</code>. Aspire orchestrates a DevChain node, PostgreSQL database, blockchain indexer, ERC-4337 bundler, and Blazor explorer — all wired with service discovery, health checks, and OpenTelemetry. <a href="https://docs.nethereum.com/docs/devchain/overview">Learn more</a></p>
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<img src="images/aspire-devchain.png" alt="Aspire dashboard showing DevChain, Explorer, Indexer, Bundler, and PostgreSQL resources" class="img-responsive" />
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<!-- 2. SDK: Portfolio -->
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<h3 class="slide-title">Cross-Chain Portfolio Scanning</h3>
<p class="slide-summary">Scan token holdings across multiple chains simultaneously using multicall — no indexer required. The Wallet SDK queries ERC-20 balances directly from each chain's RPC, with live prices from CoinGecko via Token Services. Works with any EVM chain you add. <a href="https://docs.nethereum.com/docs/data-services/guide-token-portfolio">Learn more</a></p>
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<img src="images/walletsdk-holdings.png" alt="Cross-chain portfolio scanning showing token balances across multiple chains" class="img-responsive" />
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<!-- 3. EXPLORER: Dashboard -->
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<h3 class="slide-title">Explorer: Dashboard</h3>
<p class="slide-summary">Full Blazor Server blockchain explorer with live dashboard showing latest blocks and transactions. Built-in localisation (English, Spanish). Indexes to PostgreSQL with automatic token transfer tracking. <a href="https://docs.nethereum.com/docs/data-and-indexing/guide-explorer">Learn more</a></p>
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<img src="images/explorer-dashboard.png" alt="Blockchain Explorer dashboard showing latest blocks and transactions" class="img-responsive" />
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<!-- 4. EVM: Simulation -->
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<h3 class="slide-title">EVM Simulation & Transaction Preview</h3>
<p class="slide-summary">Before sending a transaction, simulate it entirely in-process. This Aave deposit shows the full EVM execution: nested contract calls, balance changes across tokens, decoded events, and gas costs — all computed locally without touching a node. Catch errors before they cost gas. <a href="https://docs.nethereum.com/docs/evm-simulator/overview">Learn more</a></p>
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<img src="images/evm-simulation.gif" alt="EVM simulation of an Aave deposit showing contract calls, balance changes, and decoded events" class="img-responsive" />
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<!-- 5. INFRA: Indexer PostgreSQL -->
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<h3 class="slide-title">Blockchain Indexer & PostgreSQL Storage</h3>
<p class="slide-summary">Index blocks, transactions, event logs, ERC-20/721/1155 token transfers, and MUD table records to PostgreSQL, SQL Server, or SQLite. Run as a hosted service with resume-after-restart and reorg handling. The foundation that powers the explorer, token tracking, and MUD browsing. <a href="https://docs.nethereum.com/docs/data-and-indexing/guide-database-storage">Learn more</a></p>
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<img src="images/indexer-postgres.png" alt="PostgreSQL table view showing indexed blockchain data, tokens, and MUD tables" class="img-responsive" />
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<!-- 6. SDK: Accounts -->
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<h3 class="slide-title">Pluggable Account Types</h3>
<p class="slide-summary">Create accounts from mnemonic phrases (12 or 24 words with optional passphrase), import private keys, add view-only addresses for monitoring, or connect hardware wallets like Trezor and Ledger. All stored in encrypted Web3 keystore format. <a href="https://docs.nethereum.com/docs/wallet-sdk/guide-wallet-accounts">Learn more</a></p>
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<img src="images/walletsdk-accounts.png" alt="Account creation supporting mnemonic, private key, view-only, and Trezor hardware wallet" class="img-responsive" />
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<!-- 7. EXPLORER: Contract Interaction -->
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<h3 class="slide-title">Explorer: Contract Interaction</h3>
<p class="slide-summary">Query and transact with any verified contract directly in the browser. Function calls are decoded with parameter names, receipt events are decoded automatically, and transaction history is fully browsable. Works with ABI from Sourcify, Etherscan, or 4Byte. <a href="https://docs.nethereum.com/docs/data-and-indexing/guide-explorer">Learn more</a></p>
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<img src="images/explorer-contract-interaction.gif" alt="Contract interaction showing query, transact, receipt decoding with event decoding" class="img-responsive" />
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<!-- 8. SDK: Transfer with EVM sim -->
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<h3 class="slide-title">Transfer with EVM Simulation</h3>
<p class="slide-summary">Send native ETH or any ERC-20 token with a built-in EVM simulation step. Before the transaction goes on-chain, you see exactly what will happen: balance changes, gas cost, and any potential reverts. Supported across all configured chains. <a href="https://docs.nethereum.com/docs/wallet-sdk/guide-wallet-transactions">Learn more</a></p>
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<img src="images/walletsdk-evm-transfer.png" alt="Token transfer with EVM simulation preview showing expected balance changes" class="img-responsive" />
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<!-- 9. EXPLORER: MUD Tables -->
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<h3 class="slide-title">Explorer: MUD Tables</h3>
<p class="slide-summary">Browse MUD World tables directly in the explorer. Query and filter records, see table schemas, and inspect on-chain state from MUD-based applications. MUD Store events are indexed to PostgreSQL and normalised into queryable tables. <a href="https://docs.nethereum.com/docs/mud-framework/overview">Learn more</a></p>
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<img src="images/explorer-mud-tables.gif" alt="MUD World tables with querying and filtering in the blockchain explorer" class="img-responsive" />
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<!-- 10. SDK: Hardware wallets -->
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<h3 class="slide-title">Hardware Wallet Support</h3>
<p class="slide-summary">Full Trezor integration with PIN prompts, passphrase entry, and account index scanning. Supports legacy and modern derivation paths. Also works on mobile via USB with MAUI. Ledger support available too. Keys never leave the device. <a href="https://docs.nethereum.com/docs/signing-and-key-management/guide-hardware-wallets">Learn more</a></p>
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<img src="images/walletsdk-trezor.png" alt="Trezor hardware wallet integration with PIN prompt and account scanning" class="img-responsive" />
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<!-- 11. EXPLORER: Debugging -->
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<h3 class="slide-title">Explorer: Transaction Debugging</h3>
<p class="slide-summary">Step-through debug any transaction at the EVM opcode level directly in the browser. Inspect the stack, memory, storage, and program counter at each step. Decode nested call trees to understand complex contract-to-contract interactions. <a href="https://docs.nethereum.com/docs/evm-simulator/guide-evm-debugging">Learn more</a></p>
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<img src="images/explorer-debugging.png" alt="EVM transaction debugging with opcode-level step-through" class="img-responsive" />
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<!-- 12. SDK: Prices -->
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<h3 class="slide-title">Portfolio with Live Prices</h3>
<p class="slide-summary">Token holdings with real-time pricing from CoinGecko. The portfolio view combines on-chain balance scanning (via multicall, independent of any indexer) with off-chain price feeds, giving you a complete picture of holdings across all configured chains. <a href="https://docs.nethereum.com/docs/wallet-sdk/overview">Learn more</a></p>
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<img src="images/walletsdk-prices.png" alt="Token portfolio with live prices from CoinGecko" class="img-responsive" />
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<!-- 13. EXPLORER: EIP-6963 -->
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<h3 class="slide-title">Explorer: Wallet Connection (EIP-6963)</h3>
<p class="slide-summary">Connect browser wallets server-side in Blazor — not just WASM. EIP-6963 discovery automatically detects MetaMask, Brave Wallet, Coinbase Wallet, and any injected provider. Sign transactions and interact with contracts directly from the explorer. <a href="https://docs.nethereum.com/docs/blazor-dapp-integration/guide-blazor-wallet-connect">Learn more</a></p>
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<img src="images/explorer-eip6963.png" alt="EIP-6963 wallet discovery detecting MetaMask, Brave, and Coinbase wallets" class="img-responsive" />
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<!-- 14. SDK: Chains -->
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<h3 class="slide-title">Multi-Chain Configuration</h3>
<p class="slide-summary">Add any EVM-compatible chain. Configure single, random, or load-balanced RPC endpoints for privacy and reliability. For Ethereum mainnet, add a Beacon Chain endpoint to enable light client proof verification of balances — trustless state queries without trusting the RPC provider. <a href="https://docs.nethereum.com/docs/consensus-light-client/guide-verified-state">Learn more</a></p>
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<img src="images/walletsdk-chains.png" alt="Chain configuration showing RPC endpoint management and Beacon Chain integration" class="img-responsive" />
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<!-- 15. SDK: Decoding -->
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<h3 class="slide-title">Contract Call & Event Decoding</h3>
<p class="slide-summary">Every transaction is automatically decoded using ABI data from Sourcify, Etherscan, or 4Byte signature lookup. See function names, parameter values, and emitted events in human-readable form instead of raw hex. Works for any verified contract. <a href="https://docs.nethereum.com/docs/core-foundation/guide-decode-transactions">Learn more</a></p>
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<img src="images/walletsdk-evm-decoding.png" alt="Decoded contract calls and events showing function names and parameter values" class="img-responsive" />
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<!-- 16. SDK: Mobile -->
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<h3 class="slide-title">Mobile & Cross-Platform</h3>
<p class="slide-summary">The same Wallet SDK runs on desktop (Blazor, Avalonia) and mobile (MAUI on Android and iOS). MVVM architecture means shared ViewModels across all platforms — only the renderer changes. Hardware wallets work on mobile too via USB. <a href="https://docs.nethereum.com/docs/wallet-sdk/overview">Learn more</a></p>
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<img src="images/walletsdk-mobile.png" alt="Nethereum Wallet SDK running on mobile devices" class="img-responsive" />
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<!-- 17. GAME: Unity -->
<div class="carousel-single">
<h3 class="slide-title">Unity Game Integration</h3>
<p class="slide-summary">Build blockchain games with Unity3d. Nethereum supports deployment to WebGL, iOS, Android, desktop, and consoles. Connect browser wallets via EIP-6963 discovery, interact with smart contracts using typed services, and manage in-game tokens and NFTs. <a href="https://docs.nethereum.com/docs/unity/overview">Learn more</a></p>
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<img src="images/unity-game.png" alt="CafeCosmos - a Unity game using Nethereum for Ethereum integration" class="img-responsive" />
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<!-- 18. GAME: Flappy (nostalgic) -->
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<h3 class="slide-title">Nethereum Flappy</h3>
<p class="slide-summary">The original Nethereum Unity demo — a blockchain-powered Flappy Unicorn game. One of the first Ethereum games built with .NET and Unity3d, demonstrating smart contract interaction from a game engine. Still playable today. <br><br><a href="http://flappyeth.nethereum.com/">Play Online</a> | <a href="https://github.com/Nethereum/Nethereum.Flappy">Source Code</a> | <a href="https://docs.nethereum.com/docs/unity/overview">Unity Docs</a></p>
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<img src="images/flappy.jpg" alt="Nethereum Flappy - blockchain-powered Flappy Unicorn game" class="img-responsive" />
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<h3>We’re dedicated to an open source .NET ecosystem and have years of experience in Enterprise software development and blockchain.</h3>
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