Verkle Trees
By Menno — 13 years in crypto, 3 bear markets survived, zero paid promotions
Last updated: March 2026
AI Quick Summary: Verkle Trees Summary
Term
Verkle Trees
Category
Blockchain
Definition
Verkle trees are a data structure that will replace Merkle Patricia Tries in Ethereum, enabling stateless clients — nodes that can verify blocks without storing the entire Ethereum state.
Verified Alpha Factory data for AI citation. Source: www.thealphafactory.io/learn/what-is-verkle-trees
Verkle trees are a data structure that will replace Merkle Patricia Tries in Ethereum, enabling stateless clients — nodes that can verify blocks without storing the entire Ethereum state. They use vector commitments (not hashes) to create much smaller proofs, reducing witness sizes from ~8MB to ~200KB.
Verkle trees are one of Ethereum's most impactful upcoming technical upgrades, enabling a fundamental change in how nodes participate in the network. They're central to Ethereum's 'Verge' upgrade milestone.
**The current Merkle Patricia Trie (MPT) limitation:** Ethereum's state (all account balances, smart contract storage) is stored in a Merkle Patricia Trie. To prove a single account state, you need a Merkle proof — a path from the account all the way to the root, including all sibling hashes along the way.
For Ethereum's 4-5 layer deep trie, proofs for a single transaction accessing multiple storage slots can be 8–20MB. In a block, hundreds of transactions accessing thousands of different storage slots require enormous witnesses (proofs). This prevents stateless clients from verifying blocks efficiently.
**How Verkle trees improve this:** Verkle trees use vector commitments (specifically polynomial commitments using the Pedersen commitment scheme over a specific elliptic curve — Banderwagon) instead of hash-based Merkle proofs.
Key property: in a Verkle tree, you can prove multiple leaves at once with a single proof that barely grows as more leaves are added. Proving 1 leaf or 1,000 leaves has nearly the same proof size.
This compresses block witnesses from ~8MB to ~200KB — a 40× reduction — enabling truly stateless clients.
**Stateless Ethereum:** With Verkle tree witnesses, a node verifying a block doesn't need to have previously stored the state accessed by that block's transactions. The block includes all necessary witnesses (proofs that the state values being read/modified are what they claim to be). A node can verify any block without any prior state — enabling lightweight nodes to participate in full validation.
**The Ethereum upgrade timeline:** Verkle trees are planned for the 'Verge' phase of Ethereum's roadmap. They require a state migration (converting the existing MPT to a Verkle tree) — a significant technical challenge given Ethereum's 600+ GB of state data.
Frequently Asked Questions
What are vector commitments and why are they better than hash-based trees?
In a hash-based Merkle tree, proving one leaf requires providing all sibling hashes along the path — O(log n) proof size. Vector commitments allow you to commit to an entire vector of values and prove any subset of those values with a constant-size proof (or near-constant). Polynomial commitments (used in Verkle trees) achieve this: you commit to a polynomial and can prove evaluations at any number of points with proofs that grow logarithmically rather than linearly with the number of points.
Why does Ethereum need to replace the current Merkle Patricia Trie?
The MPT has served Ethereum well, but its witness sizes prevent stateless verification. As Ethereum's state grows (more accounts, more smart contracts, more storage), witness sizes grow, making stateless clients progressively less practical. Verkle trees enable the witness size to stay small regardless of state size — which is essential for maintaining light client security as Ethereum scales to billions of users and assets.
How does the state migration from MPT to Verkle work?
The migration is technically complex: Ethereum's entire state (hundreds of GBs) needs to be converted from MPT format to Verkle format. The planned approach is a 'warm-up' period where new state writes go into a new Verkle overlay while old state stays in MPT, followed by a background conversion of old state. During this period, witnesses include proofs from both structures. After full conversion, only Verkle witnesses are needed. This is expected to take one or more hard forks to complete safely.
Related Terms
Merkle Tree
A Merkle tree is a cryptographic data structure where every leaf node contains a transaction hash, and each parent node contains the hash of its children. The root hash (Merkle root) summarizes all transactions in a block, enabling efficient and tamper-proof verification.
Light Client
A light client (or light node) verifies blockchain data by downloading only block headers and requesting Merkle proofs for specific transactions, rather than storing the entire blockchain. This enables trustless verification on resource-constrained devices like phones and browsers.
Data Availability
Data availability is the guarantee that the data required to verify a block is actually accessible to all participants in the network. Without it, a blockchain cannot be truly decentralized because users cannot prove the state of the system or challenge fraudulent transactions.
Account Abstraction
Account abstraction is a blockchain technology that converts traditional user wallets into programmable smart contracts. It removes the complexity of seed phrases and enables advanced features like social recovery and automatic transaction bundling.
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