Solana Unity CoreSolana Development Library for C# and Unity

What Is Solana Unity Core?

Solana Unity Core, published under the name Solana.Unity, is a port of Solnet, an earlier .NET client for Solana. The main change is compatibility: the code targets .NET Standard 2.0, which means it can be referenced from many .NET projects, including those that run on older runtimes.

The library can also be used with Unity. That matters because Unity is a common environment for games, simulations and interactive apps, and developers who work in C# there usually want to avoid switching languages just to talk to a blockchain. With this package, the same C# logic can handle account lookups, token transfers and transaction building inside a game.

Think of the library as a toolkit rather than a finished product. It does not give end users a graphical app. Instead, it provides classes and methods that a developer calls from their own code to read network data, manage keys and assemble transactions.

Who Is This Library For?

Solana Unity Core is built for programmers who already work in C# or Unity. A typical user is a game developer who wants to show a player's token balance, reward players with SPL tokens, or let them sign simple on-chain actions from within the game.

Backend developers are another audience. A .NET service that monitors account changes, decodes incoming transactions for an internal dashboard, or prepares token transfers can use the RPC and transaction tools without writing low-level request code.

People who are not programmers will get little direct use from the library on its own. If you want to check a balance or send tokens without writing code, a finished wallet application is a better fit. Solana Unity Core is the layer underneath such applications, which is why its features focus on building blocks rather than on a user interface.

How Rent Exemption and Token Accounts Work

Two concepts come up repeatedly when working with this library: rent exemption and Associated Token Accounts. On Solana, an account must hold a minimum balance of lamports to be considered rent-exempt, so it is not reclaimed by the network. The library's examples call GetMinimumBalanceForRentExemption for both token accounts and mint accounts, using the data sizes defined in the Token Program, and then wait for the result before creating the account.

An Associated Token Account is a standard address derived from a wallet and a token mint. Each wallet and token pair has one predictable account, which makes it easier for applications to know where tokens should go. When the recipient does not have such an account yet, one can be created during the transfer. The library's comment in its examples notes that the account is created if required and funded by the fee payer.

Understanding these two points helps you budget for transactions and avoid surprises. If you build the account setup yourself, you must calculate the rent amount correctly. If you rely on the TokenWallet, much of that work is handled for you, but you still need to know who pays the fees and account rent in your application.

Supported coins

The library's documentation mentions Ethereum (ETH) alongside Solana (SOL). The API surface is centered on Solana, including its JSON RPC interface, SPL token programs and native programs, so Solana is the network most developers will plan around when using this package.