Privacy blockchain is not a monolith. Zcash, Aztec, and Sanect all claim to provide transaction privacy, but they have made fundamentally different architectural bets. Each approach has genuine strengths. This comparison attempts to be fair to all three while being precise about the actual tradeoffs.
Background on Each System
Zcash is the original shielded blockchain, launched in 2016. It introduced the Sapling protocol for efficient ZK proofs and has years of real-world cryptographic battle-testing. Zcash uses a UTXO model, similar to Bitcoin, where shielded transactions consume and create private "notes."
Aztec is a privacy-first Layer 2 built on Ethereum, currently in active development with a testnet live in 2026. Aztec builds on Ethereum's settlement security and uses its own Noir programming language for writing private smart contracts. It inherits Ethereum's ecosystem while adding privacy via a rollup design.
Sanect is a privacy-native EVM Layer 1 chain (chain ID 7628) built on Cosmos SDK and CometBFT. Its core differentiator is MetaMask-native UX — users do not need a separate wallet or seed phrase to access shielded transactions. Privacy is handled via Noir ZK circuits on Barretenberg's universal SRS (UltraHonk proving system).
Comparison Across 8 Dimensions
1. Privacy Model
Zcash: UTXO-based shielded pool. Fully private transactions use zk-SNARKs (Sapling/Orchard) to hide sender, receiver, and amount. "Transparent" transactions also exist and are publicly visible — privacy is opt-in, which limits the anonymity set.
Aztec: Account-based model with private state. Smart contracts can hold private state that is only readable by the state owner. Privacy is enforced at the smart contract level using Noir proofs.
Sanect: Hybrid model — EVM public transactions coexist with a shielded pool for private transfers. Shielded transactions use UltraHonk proofs via a custom Noir circuit on Barretenberg's universal SRS. The long-term goal is to increase the shielded anonymity set so privacy becomes the default path, not the exception.
2. Wallet UX
Zcash: Requires a dedicated Zcash wallet (ZecWallet, Nighthawk, or similar). Users manage a new seed phrase. MetaMask cannot be used. High onboarding friction for users already in the EVM ecosystem.
Aztec: Requires Aztec's own wallet infrastructure for private functions. Public Ethereum interactions can use MetaMask, but private interactions require additional tooling. The UX story is still evolving on testnet.
Sanect: MetaMask-native. Users add Sanect as a custom network in their existing MetaMask wallet. No additional seed phrase. Shielded transactions are initiated from the same wallet interface. This is Sanect's most significant UX advantage.
3. Settlement Layer
Zcash: Native L1. Settles on its own chain with its own validator/miner set. No dependency on Ethereum.
Aztec: Ethereum L2. Inherits Ethereum's security for settlement, which is a genuine advantage — Ethereum's validator set is the largest and most battle-tested. However, this also means Aztec inherits Ethereum's cost structure and any L1-visible metadata from deposits and withdrawals.
Sanect: Native L1 via Cosmos SDK and CometBFT. BFT finality in ~400ms. Independent from Ethereum, which means no inherited security from Ethereum's validator set, but also no inherited privacy leaks from L1 settlement.
4. Block Time
Zcash: ~75 seconds (Bitcoin-like PoW mining with halved intervals). This is the slowest of the three by a significant margin.
Aztec: L2 block time is fast (seconds), but L1 finality on Ethereum is 12 seconds per slot, with full economic finality at 2 epochs (~13 minutes).
Sanect: ~400ms BFT finality. Instant and irreversible — no waiting for confirmations or epoch finalization.
5. ZK Proof System
Zcash: Groth16 (Sapling) and Halo2 (Orchard). Groth16 requires a trusted setup per circuit; the Sapling ceremony involved hundreds of participants. Orchard uses Halo2 and eliminates the trusted setup requirement.
Aztec: Honk/UltraPlonk proving system, developed in-house. Uses KZG polynomial commitments which require a universal trusted setup (but a universal one, not circuit-specific). Aztec's proving infrastructure is designed to support in-browser proving via WASM.
Sanect: UltraHonk via a custom 2-in/2-out Noir circuit on Barretenberg's universal SRS. No per-circuit trusted setup. Designed for in-browser proving, with proof generation running in the staking dApp via WebAssembly.
6. EVM Compatibility
Zcash: No EVM compatibility. Zcash smart contracts use its own scripting system, which is intentionally limited in scope. No Solidity, no existing EVM tooling.
Aztec: Public functions on Aztec are EVM-compatible. Private functions use Noir, which is a new language that requires learning. Existing Solidity contracts cannot be directly ported to private state without rewriting.
Sanect: Full EVM compatibility via cosmos/evm. Any Solidity contract can deploy on Sanect without changes. Standard EVM tooling (Hardhat, Foundry, MetaMask) works out of the box.
7. Staking and Token Economics
Zcash: Proof-of-work mining with a halving schedule. No staking. ZEC holders cannot earn yield without running mining hardware.
Aztec: Decentralized sequencer/prover network with staking mechanics still being designed. Token launch and economics not finalized as of mid-2026.
Sanect: DPoS with SNCT staking. Validators stake SNCT to enter the top-50 active set. Delegators earn staking rewards proportional to stake without running hardware. Inflation-funded rewards target 7–20% APR depending on bonded ratio.
8. Current Network Status
Zcash: Mainnet has been live since 2016. Highly stable, battle-tested, with established tooling and exchange support.
Aztec: Public testnet live in 2026. Sandbox environment available for developers. Mainnet launch timeline not announced as of this writing.
Sanect: Mainnet live (chain ID 7628) with EVM RPC, block explorer, staking dApp, DEX, .snct name service, and Hyperlane bridge to Ethereum. Shielded pool deployed with real UltraHonk verifier — full shield/send/unshield round-trip verified on-chain. Testnet continues to run alongside for development.
Which One Should You Use?
The honest answer depends on your priorities. Zcash has years of battle-testing that neither Aztec nor Sanect can yet match — if you need proven cryptographic security for high-value transactions today, Zcash's Orchard shielded pool is the most mature option. Aztec is the best bet if you want Ethereum ecosystem leverage and are comfortable with early-stage testnet tooling. Sanect is the right choice if MetaMask UX and fast finality are priorities — mainnet is live with a working shielded pool, DEX, and bridge infrastructure.
No privacy blockchain has solved all the tradeoffs simultaneously. The space is still early. The right question is not "which one wins" but "which tradeoffs do you accept given your specific use case."