# What is Base58 and How Does BSV use it?

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#### What is the “Check”?

The **“check” in Base58Check** refers to a short **checksum** (a hash value) that is **appended** to the end of the Base58-encoded data.

* This checksum acts as a **built-in integrity check**.
* If any character in the data changes, the checksum will no longer match.
* This ensures errors (such as typos or tampering) can be **detected automatically**.

***

#### Real-World Example

Suppose **Alice wants to send BSV to Bob**:

1. Alice scans Bob’s wallet address via QR code.
2. Her wallet saves the **checksum bytes** of Bob’s address.
3. Unknown to Alice, her phone has **malware** that tries to swap Bob’s address with an attacker’s address.
4. Before broadcasting the transaction, Alice’s wallet runs a **checksum integrity check**.
5. The altered address **fails validation**, and the transaction is blocked.
6. Alice removes the malware and successfully resends the funds to Bob.

👉 **Key takeaway:** The checksum helps protect against **errors and malicious tampering** before transactions are sent.

***

#### Features of Base58Check

Base58Check encoding provides several important features:

* **Flexible input size** → Works with arbitrary-length data.
* **58 alphanumeric characters** → No ambiguous symbols (avoids 0/O, I/l).
* **Version byte** → Indicates type of data (e.g., `0x00` for addresses, `0x05` for alternatives).
* **Checksum (4 bytes)** → Based on SHA-256, detects errors automatically.
* **Preserves leading zeros** → Ensures correct handling of padded values.

***

#### How BSV Uses Base58Check

In the **BSV system**, Base58Check is used to:

* **Encode addresses** → Derived from public keys during address creation.
* **Export/import private keys** → Through **Wallet Import Format (WIF)**, making wallet transfers more secure and user-friendly.

**🔗 Learn more on the BSV Wiki:**

* [Encoding a BSV Address in Base58Check](https://wiki.bitcoinsv.io/index.php/Base58Check_encoding) &#x20;
* [Wallet Import Format](https://wiki.bitcoinsv.io/index.php/Wallet_Import_Format_\(WIF\))


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