# Changelog #4

By [Lett3r](https://paragraph.com/@lett3r) · 2023-05-09

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Hello, Lett3r Beta testers! We're excited to announce our **fourth platform update**, which introduces some **new features and improvements** to make your blockchain transactions **even more secure**. Let's take a closer look at the changes.

Uniswap Permit2
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Uniswap Permit2 is a token approval contract that **standardizes token approvals** across different smart contracts. It improves user experience by **reducing transaction costs** and **enhancing smart contract security**.

The **traditional token approval** method had some **weaknesses**, such as requiring users to **send an approval transaction** for each new application they wanted to use, and applications asking users to **approve the maximum allowance**, giving them **access to** the user's **entire token balance**. **EIP-2612** iterated on token approvals by allowing users to **append a signed permit message** to their transaction, but **not all tokens have adopted it**.

Permit2 introduces **signature-based approvals and transfers** for any ERC-20 token, **regardless of EIP-2612 support**, and comes with features such as **expiring approvals** and batch approvals and transfers.

![Example of Permit2](https://storage.googleapis.com/papyrus_images/cce4a438ac835461456c9f504f7dd223c1402ed87f263a558b277b33c2bdd1ed.png)

Example of Permit2

We've added **support for Permit2 events**, so you will receive an email notification **every time a permit you signed is used**.

Address Poisoning Alerts
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Address poisoning is a **scam** that relies on **users copying and pasting** incorrect wallet **addresses** due to the difficulty of remembering long hexadecimal numbers.

**Scammers** use a vanity address generator to create an **address that closely matches the victim's**, then **send a small transaction** to the victim's wallet from the dummy account they created. If the **victim copies this address** by accident, they will **send funds to the scammer** instead of the intended recipient, and the **lost funds will be irretrievable**.

![Example of an Address Poisoning Alert](https://storage.googleapis.com/papyrus_images/cbdf14419cdebfb5d5c74371579bc85977d511deb705ba267009767e7daa39d1.png)

Example of an Address Poisoning Alert

We are **introducing Address Poisoning Alerts** to notify you when someone **tries to “poison” your transaction list** by sending a fake transaction. This feature will help you to **stay safe and informed** about any **potential risks** related to your transactions.

Operators for Sent Tokens Events
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We've **enhanced support for Approvals** on ERC-20 tokens. This update introduces a **new compressed format for Transfer** events operated by someone else. This new format **will let you know** when the **operator** is **still approved to trade** your tokens. Approvals **signed with Permit2** will be **supported** too.

![Example of a Sent tokens event where the operator cannot trade anymore](https://storage.googleapis.com/papyrus_images/b8e203bb2e421ae5191e89bbae24d858954b738537810f5971b1dc778684b6b8.png)

Example of a Sent tokens event where the operator cannot trade anymore

![Example of a Sent tokens event where the operator can still trade tokens](https://storage.googleapis.com/papyrus_images/0f6f530c272e54db4fa6361fda7ba1258df243b81fa7f54b36ba4e5ead54887c.png)

Example of a Sent tokens event where the operator can still trade tokens

Unknown Token Alert
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In the last update, we started using **Token Lists** to build and maintain a database of **trusted fungible tokens**. In this update, we **enhanced** the ERC-20 **token related events** to include an **alert** when the **token is unknown**.

![Example of Unknown Token Alert](https://storage.googleapis.com/papyrus_images/47bbc06832ad3ad8b7eb714882f176919b2e1424514bbb0a56e7cc4d79fab0b7.png)

Example of Unknown Token Alert

Improvements and Fixes
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This release also includes:

*   Improved approval events
    
*   Minor bug fixes
    

Feedback
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We always **appreciate your feedback**, so please don't hesitate to **let us know what you think** of these updates or any other aspect of Lett3r. You can **respond directly to our emails** or **fill out our feedback survey**.

**Thank you** for being a part of Lett3r's Private Beta! Please **spread the word** and **invite your friends** to join us.

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*Originally published on [Lett3r](https://paragraph.com/@lett3r/changelog-4)*