Base OASIS Provider

Overview

The Base OASIS Provider enables seamless integration between the OASIS ecosystem and Base, Coinbase's Layer 2 network built on Optimism. This provider implements the full OASIS storage and blockchain interfaces, allowing avatars, holons, and NFTs to be stored and managed on Base's secure, low-cost, and developer-friendly blockchain.

Features

✨ Full OASIS Integration

• Avatar management (create, read, update, delete)

• Avatar detail storage

• Holon (data object) storage

• NFT minting and transfers

• Transaction management

⚡ Base Network Support

• Optimistic rollup technology

• Ethereum security

• Low gas fees

• Fast transactions

🔐 Security Features

• Wallet integration via WalletManager

• Private key management

• Transaction signing and verification

• Backed by Coinbase

Installation

Add the Base OASIS Provider to your project:

dotnet add package NextGenSoftware.OASIS.API.Providers.BaseOASIS

Configuration

Initialize Provider

using NextGenSoftware.OASIS.API.Providers.BaseOASIS;

// Base Mainnet
var baseProvider = new BaseOASIS(
    hostUri: "https://mainnet.base.org",
    chainPrivateKey: "YOUR_PRIVATE_KEY",
    chainId: 8453,
    contractAddress: "YOUR_CONTRACT_ADDRESS"
);

// Base Sepolia Testnet
var baseProviderTestnet = new BaseOASIS(
    hostUri: "https://sepolia.base.org",
    chainPrivateKey: "YOUR_PRIVATE_KEY",
    chainId: 84532,
    contractAddress: "YOUR_CONTRACT_ADDRESS"
);

await baseProvider.ActivateProviderAsync();

Network Details

Mainnet

• RPC URL: https://mainnet.base.org

• Chain ID: 8453

• Explorer: https://basescan.org

• Currency: ETH

• Bridge: https://bridge.base.org

Sepolia Testnet

• RPC URL: https://sepolia.base.org

• Chain ID: 84532

• Explorer: https://sepolia.basescan.org

• Faucet: https://www.coinbase.com/faucets/base-ethereum-goerli-faucet

Usage Examples

Save Avatar

var avatar = new Avatar
{
    Id = Guid.NewGuid(),
    Username = "base_user",
    Email = "[e-mail]"
};

var result = await baseProvider.SaveAvatarAsync(avatar);
if (!result.IsError)
{
    Console.WriteLine($"Avatar saved on Base: {result.Result.Id}");
}

Load Avatar

var result = await baseProvider.LoadAvatarAsync(avatarId);
if (!result.IsError)
{
    Console.WriteLine($"Loaded: {result.Result.Username}");
}

Mint NFT

var mintRequest = new MintNFTTransactionRequest
{
    MintWalletAddress = "0x...",
    JSONMetaDataURL = "ipfs://...",
    MemoText = "My OASIS NFT on Base"
};

var result = await baseProvider.MintNFTAsync(mintRequest);
if (!result.IsError)
{
    Console.WriteLine($"NFT Minted on Base: {result.Result.TransactionResult}");
}

Send Transaction

var txRequest = new WalletTransactionRequest
{
    ToWalletAddress = "0x...",
    Amount = 0.01m // 0.01 ETH
};

var result = await baseProvider.SendTransactionAsync(txRequest);

Smart Contract ABI

The provider uses a standard OASIS smart contract with the following functions:

• CreateAvatar(uint256, string, string)

• CreateAvatarDetail(uint256, string, string)

• CreateHolon(uint256, string, string)

• GetAvatarById(uint256)

• GetHolonById(uint256)

• mint(address, string) - NFT minting

• sendNFT(...) - NFT transfers

Performance

• Transaction Speed: 2 seconds

• Cost: ~10-100x cheaper than Ethereum L1

• Finality: 1-2 seconds (soft), ~1 week (hard on Ethereum)

• Throughput: Scales with Ethereum

Advantages

🚀 Developer Friendly

• EVM compatible

• Easy migration from Ethereum

• Comprehensive tooling

• Coinbase support

💰 Cost Effective

• Ultra-low gas fees

• Predictable costs

• Ethereum security

🔗 Ecosystem

• Coinbase integration

• Growing DeFi ecosystem

• NFT marketplaces

• Cross-chain bridges

Why Base?

• Backed by Coinbase: Enterprise-grade reliability

• Optimistic Rollup: Ethereum security with L2 speed

• Low Fees: Affordable for all users

• Developer Tools: Full Ethereum tooling support

• Onboarding: Easy fiat on-ramps via Coinbase

License

MIT License - Copyright © NextGen Software Ltd 2025

Support

• Documentation: https://docs.base.org

• OASIS Docs: https://oasis.earth

• Base Discord: https://base.org/discord

• Issues: https://github.com/NextGenSoftwareUK/Our-World-OASIS-API-HoloNET-HoloUnity-And-.NET-HDK/issues