TLDR
- Starknet launches STRK20 to bring private transfers to ERC20 assets.
- STRK20 adds shielded balances without using traditional mixer models.
- Viewing keys allow selective wallet disclosure for legal requests.
- strkBTC becomes the first major asset to deploy Starknet’s STRK20.
- Starknet frames STRK20 as compliant privacy for ERC20 activity.
Starknet has introduced STRK20, a zero-knowledge privacy framework for ERC20 assets on its network. The framework supports shielded balances and private transfers, while it keeps disclosure paths open for legal requests. It also gives developers a direct way to add privacy features without separate infrastructure.
STRK20 Adds Privacy to ERC20 Transfers
STRK20 allows any ERC20 asset on Starknet to support private movement and balance shielding. Developers can use it across transfers, swaps, lending, staking, payments, and donations. As a result, privacy becomes part of normal asset activity on the network.
The framework uses an embedded masking mechanism instead of a traditional mixer model. Mixers usually move funds through separate pools or addresses to hide transaction links. STRK20 places shielding inside the ERC20 asset flow itself.
This structure allows users to move between public and private modes through supported Starknet wallets and applications. It also reduces the need for separate privacy tools. Therefore, developers can build private ERC20 experiences with fewer technical layers.
Viewing Keys Support Selective Disclosure
STRK20 includes a viewing key system for controlled disclosure of wallet information. These keys allow specific information to be shared when legally binding requests require it. The system does not open full wallet activity to public review.
The Starknet team said this design separates STRK20 from mixer-based privacy systems. It aims to protect transaction confidentiality while keeping compliance tools available. Institutions and developers can use privacy features without removing legal response options.
Starknet Foundation VP of Growth Damian Chen said STRK20 enables practical privacy for users, builders, and institutions. He added that it preserves confidentiality from public view and supports lawful disclosure when required. His comments place STRK20 within the wider push for compliant blockchain privacy.
strkBTC Becomes First STRK20 Use Case
The framework has already launched on strkBTC, which represents bitcoin activity on Starknet. STRK20 now allows strkBTC users to shield balances and send private transfers. This gives the framework its first major live use case.
The strkBTC rollout shows how ERC20 assets can add privacy without leaving Starknet’s application layer. Users can move bitcoin-linked assets between public and private states through supported tools. Meanwhile, developers can connect these features to broader DeFi and payment systems.
StarkWare CEO Eli Ben-Sasson said zero-knowledge privacy tools could support more targeted regulatory actions over time. He argued that current privacy investigations can affect many wallets beyond a specific case. Therefore, STRK20 positions Starknet’s ERC20 privacy model around selective access, technical shielding, and regulated disclosure.
