How NFT "Mechs" Are Supercharging RAILGUN's Privacy

In my last article, I briefly mentioned how RAILGUN is integrating Mechs to streamline private DeFi transactions. It's a genuinely clever NFT use case, so let's dig into how the meld actually works.

RAILGUN 101

RAILGUN is an onchain privacy suite deployed on Ethereum and other EVM chains like Arbitrum and Polygon. Its infra relies on zero-knowledge cryptography to shield tokens (ERC-20s and NFTs) from public view.

As a user you're given a 0zk address, i.e. a private wallet, and any assets shielded inside this system become indistinguishable from each other.

Amid crypto's ongoing privacy renaissance and the Ethereum Foundation's Defipunk push, RAILGUN's become a rising bastion, with the protocol having crossed $4.5B in total shielded volume in 2025.

Rise of the Mechs

Mechs, built by Gnosis Guild, are NFT-based smart contract accounts with programmable ownership. They're built using a combination of ERC-6551 (which lets an NFT own/operate a wallet address) and ERC-4337 (an account abstraction framework).

As such, a Mech can do anything anyone can do onchain, from making a basic swap to managing sophisticated DeFi positions. Ownership is flexible, too, as a Mech can be controlled by whoever holds a specific NFT or ERC-20.

It's precisely this sort of flexibility that is poised to provide a breakthrough for RAILGUN's privacy suite.

The RAILGUN integration

As things stand, 0zk addresses are suited for atomic DeFi transactions, i.e. actions that complete in a single block like simple swaps.

However, for more complex "non-atomic" activities like borrowing, staking, and signing multi-sig transactions, plain 0zk addresses are insufficient. And this is where Mechs come in.

Under RAILGUN Connect, the project's "universal private DeFi connector," a Mech, which can do non-atomic transactions, will sit between your 0zk address and whatever protocol you're interacting with.

In other words, after you deposit unshielded tokens into your Mech, the Mech gets shielded into an 0zk address, and from there it can make calls via Zodiac Pilot (another Gnosis Guild tool) to a DeFi protocol like any regular address would.

Through this approach, a DeFi protocol will only see a normal account doing normal things, so to speak, while your private balance stays invisible onchain.

What to watch

The RAILGUN x Mechs meld hasn't been deployed in production just yet, but it's almost ready for primetime.

Gnosis Guild first proposed the integration to RAILGUN governance in April 2025. $RAIL governors ratified the proposal shortly thereafter, and development has been ongoing since.

The work is going well. In January 2026, Gnosis's Auryn Macmillan demoed RAILGUN Connect with the CoW Swap frontend, making a private swap on Polygon. There's no timeline yet for the full deployment, but this prototype suggests the launch isn't too far off.

Once Mechs are live in RAILGUN, look for other projects to tap into the power here, too. For example, the Ethereum Foundation's upcoming Kohaku privacy wallet is integrating RAILGUN's tech, so it will have an avenue to offers users private, non-atomic DeFi transactions.

Others will surely follow suit.