Ethereum’s mainnet has long faced two major hurdles to mass adoption: limited transaction throughput and volatile gas fees. These bottlenecks have made Layer 2 scaling solutions a critical focus in the evolution of blockchain infrastructure. Among the various approaches, ZK-Rollups—leveraging cryptographic proofs for instant finality and robust security—are widely regarded as one of the ultimate solutions for scaling Ethereum.
Taiko stands out as the first Type 1 ZK-EVM project in the Ethereum ecosystem built on a Based Rollup architecture. After its mainnet launch, Taiko quickly attracted over $200 million in total value locked (TVL). Its core design principle is to eliminate centralized sequencers, instead returning transaction ordering rights to Ethereum L1 validators. This approach preserves Ethereum’s core strengths: decentralization and censorship resistance.
Starting from the foundational principles of zk-Rollups, this article systematically breaks down Taiko’s scaling architecture—including the process for generating validity proofs, transaction batching mechanisms, decentralized verification structures, and its integration with Ethereum mainnet—to provide a comprehensive technical roadmap from theory to engineering implementation.
The Technology Behind zk-Rollups and the Core Mechanism of Validity Proofs
From Off-Chain Computation to On-Chain Verification: How zk-Rollups Work
ZK-Rollups are a Layer 2 scaling solution that shifts most transaction computation and state storage off-chain. Only succinct summary data and cryptographic proofs are submitted to Ethereum mainnet. Specifically, a ZK-Rollup bundles ("rolls up") thousands of transactions into a batch, executes them off-chain, and then generates a compact validity proof. This proof is submitted to a Rollup smart contract deployed on Ethereum for verification.
The key advantage of this mechanism is that Ethereum mainnet doesn’t need to verify each transaction individually. Instead, it only needs to validate a single cryptographic proof to confirm the correctness of the entire batch. Unlike traditional Optimistic Rollups, which rely on a seven-day challenge period, ZK-Rollups achieve instant finality through mathematical proofs. By 2026, ZK proof verification times had dropped below 50 milliseconds, with per-transaction costs falling under $0.01.
How Validity Proofs Are Generated
Validity proofs are the foundation of ZK-Rollup security. Their generation typically involves the following steps:
Step 1: Transaction Execution and State Update
After users initiate transactions on the Layer 2 network, Rollup nodes execute these transactions off-chain, calculating changes to the state root. The state root is a Merkle tree hash representing the current state of all accounts on the Rollup chain.
Step 2: Proof Generation (Proving)
A prover collects the transaction batch and its execution trace, then uses a zero-knowledge proof system (such as zk-SNARK or zk-STARK) to generate a validity proof. This cryptographic proof asserts that, given the initial state root, executing the batch of transactions correctly produces the new state root. The process reveals no transaction details—only that "the state transition is correct."
Step 3: Proof Submission and On-Chain Verification
The prover submits the validity proof and the new state root to the Rollup contract on Ethereum. The on-chain verifier contract checks the proof’s validity using mathematical operations—without re-executing transactions—at a fraction of the computational cost of individual transaction verification.
Step 4: Final State Confirmation
Once the proof passes verification, the Rollup contract updates its recorded state root, granting finality to the batch at the Ethereum layer. Users can withdraw from the Rollup to Ethereum mainnet immediately, without waiting for a challenge period.
At the proof generation layer, Taiko employs a multi-proof architecture that combines SGX (trusted execution environment-based proofs) and ZK proofs as independent systems. No single proof type is considered sufficient—multiple independent systems must agree on the state transition for final verification. This design significantly enhances system redundancy and security.
Transaction Batching and Aggregation: Achieving Efficient Off-Chain Processing
The Economics of Batching
Batching is central to ZK-Rollup scalability. Each off-chain virtual machine execution consumes computational resources, and submitting data to Ethereum mainnet incurs gas fees. The essence of batching is to strike an optimal balance between "off-chain computation costs" and "on-chain data publication costs."
ZK-Rollups compress multiple transactions into a batch, generate a single validity proof, and submit it to the mainnet in one go. Compared to submitting transactions individually, batching dramatically lowers the average cost per transaction. According to Ethereum’s official documentation, ZK-Rollups use data compression techniques such as account indexing instead of addresses, saving roughly 28 bytes of on-chain data per transaction.
Taiko’s Block Proposal and Batching Process
In Taiko’s protocol, proposers are responsible for bundling one or more L2 transactions into a block and submitting it to Ethereum L1 via the Inbox contract’s propose method. Proposal data is carried through blob-backed derivation sources.
In April 2026, Taiko’s mainnet underwent the Shasta upgrade, which significantly overhauled the batching process. The protocol streamlined its core contracts to three modules: Inbox, Anchor, and SignalService. Block proposal costs dropped from about 1 million gas to 45,000 gas—a 22-fold reduction. Proof verification costs fell from about 500,000 gas to 28,000 gas—an 8-fold decrease.
Decentralized Verification: Taiko’s Based Rollup and Multi-Proof Architecture
Based Rollup: Returning Sequencing Power to Ethereum
Traditional Rollups (like Arbitrum and Optimism) rely on centralized sequencers operated by project teams to bundle and order transactions. While efficient, this introduces centralization risks—sequencers can censor transactions, extract MEV, or become single points of failure.
Taiko’s Based Rollup architecture fundamentally changes this paradigm. In a Based Rollup, transaction ordering isn’t controlled by a project-run sequencer. Instead, Ethereum L1 validators directly handle transaction sequencing. L2 block order is determined by Ethereum validators as they propose L1 blocks. This means:
- Maximum Decentralization: No additional trust assumptions required
- Full Censorship Resistance: Inherits Ethereum L1’s guarantees
- Permissionless Participation: Anyone can become a proposer or prover
Taiko is thus the first L2 on Ethereum to adopt a Based Rollup design. As its official documentation states: "No centralized sequencer. No compromise."
Multi-Proof Verification System
Taiko’s verification architecture involves several roles working together:
Proposer: Submits proposals containing one or more L2 blocks to Ethereum L1 via the Inbox contract.
Prover: Generates validity proofs (SGX + ZK) to confirm correct execution of proposed blocks.
Verifier Contract: Orchestrates multiple sub-verifiers (SGX, ZK) on L1 to perform multi-proof validation.
Following the Shasta upgrade, a successful proof submission immediately finalizes the proven range. The Inbox contract checks whether the range links to the current finalized head, writes a checkpoint to SignalService, and updates the finalized proposal ID and block hash. There is no longer a separate "post-proof finalization" step—once a proposal range is proven, it is final.
Type 1 ZK-EVM: Full Ethereum Equivalence
Taiko runs an unmodified Ethereum execution layer (Type 1 ZK-EVM). Every opcode, every precompile, and every tool available on Ethereum works on Taiko without any changes. Developers can deploy the same Solidity contracts and use the same toolchains (Hardhat, Foundry, etc.).
This bytecode-level equivalence makes Taiko one of the most compatible ZK-Rollups in the Ethereum ecosystem. In May 2026, Polygon zkEVM completed its Type 1 equivalence upgrade, while Taiko has operated as a Type 1 ZK-EVM since its mainnet launch.
Interacting with Ethereum Mainnet
Cross-Layer Communication Architecture
Taiko integrates with Ethereum mainnet through a comprehensive cross-chain communication system. Key components include:
Inbox: An L1 smart contract managing proposal reception, proof submission, checkpoint recording, and finalization.
Anchor: An L2 smart contract anchoring L1 checkpoints and related metadata to the L2 chain.
Bridge: The asset and message transfer system between L1 and L2.
SignalService: A low-level cross-chain signaling contract that provides Merkle proof-based message verification for the bridge.
Deposit and Withdrawal Processes
When users deposit assets to Taiko, they send assets to the Rollup contract on Ethereum mainnet, which records the deposit event. Taiko’s off-chain nodes detect the event and mint corresponding assets for users on L2.
Withdrawals depend on validity proof verification. Once the proof is accepted by the L1 verifier contract, users can withdraw assets directly from the Rollup contract—no seven-day challenge period as required by Optimistic Rollups.
Recent Security Incident and Recovery
In June 2026, Taiko’s bridge suffered a security incident involving approximately $1.7 million. The root cause was the public exposure of an SGX signing key in the Raiko multi-prover stack on GitHub. Attackers exploited the leaked key to forge SGX prover attestations.
Taiko’s response showcased its robust governance: the security council swiftly executed on-chain remediation, confirmed no user funds were lost, and fully replenished bridge assets 1:1. As of July 2, 2026, bridge services have been restored and the network is operating normally. Following the incident, the TAIKO token rebounded roughly 75% within 24 hours, recovering to $0.20.
Market Performance and Ecosystem Progress
As of July 3, 2026 (UTC), Gate market data shows Taiko (TAIKO) trading at $0.13466, with 24-hour volume around $11.59 million, a market cap of $26.88 million, and a neutral market sentiment. The total token supply is 1 billion, with about 198 million currently in circulation. Over the past 7 days, TAIKO surged 111.36%; up 39.27% over 30 days, but down 64.07% over the past year.
On the ecosystem front, Taiko deployed the ERC-8004 agent identity registry in early February 2026, becoming one of the first L2s to support the standard. In its first month post-mainnet, over 45,000 AI agents registered on the ERC-8004 network. Taiko’s TVL peaked at $81 million in June, a 1,000% monthly increase.
Conclusion
From generating validity proofs to transaction batching, from Based Rollup’s decentralized sequencing to multi-proof verification, Taiko offers a model Layer 2 scaling solution that balances technical completeness with deep Ethereum alignment. Its Type 1 ZK-EVM ensures zero-cost developer migration, the Based Rollup design inherits Ethereum’s decentralization, and the multi-proof architecture delivers enhanced security through redundant validation.
By 2026, the Layer 2 ecosystem has matured from early experimentation to a phase of "modular upgrades + differentiated competition." ZK-Rollups, with their instant finality and cryptographic security, are becoming the mainstream scaling approach for Ethereum. Taiko’s post-Shasta cost optimizations, architectural simplifications, and its push into emerging areas like AI agents all signal that Based Rollup scaling is moving from theory to real-world, large-scale deployment.
For readers interested in Ethereum scaling and the evolution of Layer 2 ecosystems, understanding how zk-Rollups work and why Taiko made its architectural choices is key to grasping where blockchain infrastructure is headed.
FAQ
Q1: What is the core difference between zk-Rollups and Optimistic Rollups?
zk-Rollups use validity proofs (cryptographic proofs) to ensure every transaction is correct, enabling instant finality. Optimistic Rollups assume transactions are valid by default and rely on a seven-day challenge window for fraud proofs. Withdrawals from zk-Rollups are immediate, while Optimistic Rollups require waiting out the challenge period.
Q2: What does "Based Rollup" mean in Taiko’s context?
A Based Rollup is a Rollup architecture that gives L2 transaction sequencing rights back to Ethereum L1 validators. Unlike traditional Rollups that depend on centralized sequencers, Based Rollups inherit Ethereum’s censorship resistance and decentralization. Taiko is the first L2 on Ethereum to adopt this model.
Q3: How does Taiko’s multi-proof system work?
Taiko uses both SGX (trusted execution environment) and ZK proof systems. No single proof type is considered final—multiple independent systems must agree on the state transition for validation. This redundancy significantly enhances system security.
Q4: What did the Shasta upgrade change for Taiko?
Deployed to mainnet in April 2026, the Shasta upgrade streamlined the protocol’s core contracts to Inbox, Anchor, and SignalService. Block proposal costs dropped from about 1 million gas to 45,000 gas (a 22x reduction), and proof costs from about 500,000 gas to 28,000 gas (an 8x reduction).
Q5: How does Taiko interact with Ethereum mainnet?
Taiko uses four core components: Inbox (L1 contract for proposals and proof submissions), Anchor (L2 contract anchoring L1 checkpoints), Bridge (cross-chain asset and message transfer), and SignalService (cross-chain signal verification). Deposits are recorded by L1 contracts, and withdrawals are executed directly upon validity proof verification.
