zk Privacy Solution Comparison

zkBob | zk.money | Railgun | Tornado.cash |

How does zkBob compare to other privacy protocols?

zkBob provides everyday privacy to everyday users. Limits, compliant wallet checks, and other security features ensure that zkBob is a safe place for honest users to discreetly transfer stable value.

Different privacy solutions offer different tradeoffs for users seeking anonymity on-chain. Below are some features that set zkBob apart.

zkBobRailgunSecret Networkzk.Money (sunset & no longer active)Tornado.cash (pre-ban)

Stable fees

Optional KYC

No additional wallet required

No native tokens required


Deposit limits (non-KYC)

Tiered deposit limits (KYC'd)

Current withdrawal limits

Current pool size limits

TRM compliance integration

Cloud API

A big differentiator between the protocols is zkBob’s use of tokens such as USDC for transactions and fees. With stable pools, transaction fees do not fluctuate for users (hard coded to $0.10 per tx on Polygon/ $0.50 per tx on Optimism). If the actual tx cost is less, the extra amount is collected and dedicated to protocol and user support. In rare cases when it costs more, txs are divided and processed in several transactions.

zkBob pools have the additional utility including the ability to introduce compounding and lost/expired token redistribution. These features on the roadmap will provide future incentives for zkBob users.

Multitransfer is another unique zkBob feature, allowing users to transfer to multiple zk addresses with a single transaction. This is especially useful for employers sending salary payments to many employees. Rather than create proofs and pay fees for each tx, these can be sent in bulk, saving time and overhead costs.

Additional zkBob roadmap items include multi-chain deployment, decentralized relayer infrastructure, and fast client state sync also set it apart from competitors in the space.

In the table below we explore some technical and operational differences between zkBob, zk.money and Tornado.cash (pre-ban).

Operational Comparison Table

Note comparisons were made to show varying technology and zk tech. As zk.money and tornado.cash are no longer in active operation (sunset or banned), zkBob is currently the primary solution for optional privacy.

zkBobzk.money (now sunset)Tornado.cash (pre-ban)

Deployment Chain


Aztec Network Rollup

Ethereum/Gnosis Chain





Verification time

~3 ms

~ 6ms

~3 ms

Prover algorithm RAM requirements




Trusted setup

Deposit gas size




Arbitrary Deposits/Transfers/Withdrawals?

Gas fee token(s)

-> USDC/ETH/BOB deposits & withdrawals (no native token required)

-> ETH deposits & withdrawals

-> ETH deposits & withdrawals

Transfer token(s)


zkETH / zkDAI / zkrenBTC


Transaction times

< 1 minute, Polygon infra

Variable (4hours to < 5 min) based on desired fee

< 1 minute, Nova on Gnosis Chain infra


Geo restrictions

Multi-chain deployment

Decentralized relayers

Fast client-state sync

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