Umbra

Privacy preserving stealth payments on the Ethereum blockchain. Built for everyone. Stewarded by @ScopeLift.

[Umbra @UmbraCash]

Umbra v1 remains a workhorse in the privacy ecosystem. The most widely used stealth address system in crypto, with a hundred thousand users, @ScopeLift is committed to maintaining v1, even while we work to ship Umbra v2.

Here are some improvements we've made recently 👇

[Umbra @UmbraCash]

@ohdatskate Regarding 6) we can say we'll be launching Umbra v2 this year and are actively exploring integrations and collaborations with other industry projects.

If you're reading this, hit us up if you feel stealth addresses can be useful to your project or a project you know!

[Umbra @UmbraCash]

Access to the hosted frontend has been restored. Thank you for your patience and understanding.

[Umbra @UmbraCash]

As has been reported, Umbra was used to move funds associated with recent, high profile hacks. In total, we are aware of 349 ETH (~$800K) of stolen funds moving through the protocol. Reports of much higher amounts are inaccurate. A few notes:

First, as a stealth address system, Umbra is primarily useful for protecting the identity of the receiver, not the sender. Since hackers want to erase the association of funds with the hack-tainted sending address, it is not particularly helpful to hackers to move the funds through Umbra. All the stolen funds moved through the protocol can be identified, and we have been in touch with security researchers who are involved.

Second, Umbra is a permissionless protocol powered by autonomous smart contracts. There is nothing we can do to stop anyone from using these contracts, nor is there anything we can do to stop anyone from using a local or self hosted version of the Umbra frontend, which is fully open source.

We did, however, make the decision to move our hosted version of the frontend into maintenance mode. We did so this morning at 6:45 AM ET.

Please note that all funds in stealth addresses are completely safe and were never at risk. The Umbra protocol continues to operate normally, we've simply turned off our instance of the frontend.

We will restore access to the hosted frontend as soon as we are assured that doing so won't create obstacles to the current recovery efforts.

Updates will be posted here.

[Umbra @UmbraCash]

As has been reported, Umbra was used to move funds associated with recent, high profile hacks. In total, we are aware of 349 ETH (~$800K) of stolen funds moving through the protocol. Reports of much higher amounts are inaccurate. A few notes:

First, as a stealth address system, Umbra is primarily useful for protecting the identity of the receiver, not the sender. Since hackers want to erase the association of funds with the hack-tainted sending address, it is not particularly helpful to hackers to move the funds through Umbra. All the stolen funds moved through the protocol can be identified, and we have been in touch with security researchers who are involved.

Second, Umbra is a permissionless protocol powered by autonomous smart contracts. There is nothing we can do to stop anyone from using these contracts, nor is there anything we can do to stop anyone from using a local or self hosted version of the Umbra frontend, which is fully open source.

We did, however, make the decision to move our hosted version of the frontend into maintenance mode. We did so this morning at 6:45 AM ET.

Please note that all funds in stealth addresses are completely safe and were never at risk. The Umbra protocol continues to operate normally, we've simply turned off our instance of the frontend.

We will restore access to the hosted frontend as soon as we are assured that doing so won't create obstacles to the current recovery efforts.

Updates will be posted here.

[Umbra @UmbraCash]

Arguably, Ethereum's biggest mistake was not designing for privacy from the start.

It has always been a solvable problem that only recently got addressed.

Ethereum's privacy roadmap is looking good now. But we need to accelerate it.

[Pedro Gomes @pedrouid]

Ethereum biggest mistake?

Not solving Account Abstraction natively from the very beginning

It has always been a solvable problem that just got overengineered

[Ben DiFrancesco @BenDiFrancesco]

While it's bittersweet, I'm very excited to share this news. @ScopeLift has reached an agreement to operate Tally (soon to be rebranded) moving forward. Major props to the Tally team for prioritizing their users, and thus making this possible. Onward!

https://t.co/p2Mebmdgte

[Umbra @UmbraCash]

🗣️ Announcing another Umbra v1 improvement: we now support USDS on Ethereum mainnet, Base, and Arbitrum.

[Umbra @UmbraCash]

@ionlab_inc Thanks for the breakdown!

[Umbra @UmbraCash]

In the past couple of weeks we:

• Made optimizations that reduce scanning times by 50% or more
• Cut down on RPC calls made by the client to reduce errors for users with spotty or slow internet
• Migrated from MATIC to POL
• Improved wallet support & squashed bugs

[Umbra @UmbraCash]

Umbra v1 remains a workhorse in the privacy ecosystem. The most widely used stealth address system in crypto, with a hundred thousand users, @ScopeLift is committed to maintaining v1, even while we work to ship Umbra v2.

Here are some improvements we've made recently 👇

[ScopeLift @ScopeLift]

Westworld taught us all the lessons.

But did we learn?

This is why we're building @UmbraCash.

Reject surveillance tech.

Embrace privacy-preserving tools.

[Umbra @UmbraCash]

@ScopeLift Here's the video: https://t.co/oQWaVhxOKQ

Shout out to @ekang426 and the BUIDL team for what's surely going to be one of the best conferences of 2026.

Sad we aren't able to make it to Seoul for BUIDL Asia this April!

[Umbra @UmbraCash]

During @buidl_conf's BUIDL Europe 26, @huvoliveira asked a room full of builders if anyone had used stealth addresses. Not a single hand.

Well, now the video's out!

Check the link below learn about the privacy paradox and the untapped potential of stealth addresses (& Umbra!)

[Umbra @UmbraCash]

Very cool proof of concept by EF researcher @nero_eth, our co-author on the stealth address ERC standards, demonstrating privacy preserving agentic interactions using stealth addresses. This leverages our SDKs under the hood. Very nice!

[Toni Wahrstätter ⟠ @nero_eth]

AI agents need privacy, and Ethereum can provide it.

Here’s a clip of two autonomous agents discovering each other, generating stealth addresses, and interacting privately on Ethereum.

More details in the 🧵👇

[Umbra @UmbraCash]

If you're not already following @ScopeLift, the team behind Umbra, you should! We're publishing a lot more technically focused cypto content.

[ScopeLift @ScopeLift]

ScopeLift was one of the first Solidity teams in the world to use Foundry in production back in early 2022. Since then, we've honed our best practices, and today we're sharing a piece of that with the world. We've improved scopelint, our open source Foundry linter 👇

[andyguzman.eth | privacy/acc @AndyGuzmanEth]

Great to see the OG team in stealth addresses coming back 🐦‍🔥

Say privacy!

@UmbraCash

[Umbra @UmbraCash]

Umbra wouldn't have been possible without the generous support of various stakeholders, large organizations & individuals alike. We hope to pay it forward and play a significant part in contributing towards making Ethereum cypherpunk again 🫡

/end

[Umbra @UmbraCash]

*Dusts off the mic*

🎤 Can anyone hear us out there?

It's been a while since we last gave an update on the state of Umbra. Let's rectify that 👇

[Umbra @UmbraCash]

We plan to launch v2 this summer. We're looking to develop partnerships that can extend the impact of stealth addresses. If you're interested in using stealth addresses to provide better privacy for your users, please reach out!