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Anti-MEV functionality has launched on the Neo X EVM sidechain TestNet. Activated at block height 2,088,000, the upgrade introduces enveloped transactions and threshold signature support to enhance transaction fairness and network security.
MEV strategies – where miners, validators, or bots reorder, insert, or censor transactions to extract profit – are responsible for billions of dollars in user losses annually. These practices disproportionately affect retail users and undermine the integrity of DeFi products built on blockchains. Neo X is being developed in part to mitigate these exploits through an approach designed to prevent transaction-level manipulation by its network validators.
Enveloped transactions: A three-step MEV defense
The Neo X approach centers on “enveloped transactions,” a technique designed to obscure transaction details until after block finalization. The mechanism follows a three-step process:
- Encryption: Transactions are encrypted, or “enveloped,” before reaching consensus nodes. This prevents validators and MEV searchers from identifying transactions that could yield extractable value.
- Uniform Processing: Consensus nodes treat all enveloped transactions identically and package them alongside ordinary, unencrypted transactions.
- Threshold Decryption: Once the transaction order is finalized, the network performs threshold decryption. This step requires two-thirds of the consensus nodes to collaborate in decrypting transactions and finalizing the block.
The three-step process is made possible by “distributed key generation,” a cryptographic technique implemented by the Neo X development team.
Achieving single-block finality
Previously, Neo X required a one-block delay for block hash finality due to potential reorganization issues. A reorganization, or “reorg,” occurs when a node discovers a new, longer chain and switches to this chain from the previous longest chain, effectively changing the network’s historical record. This one-block delay impacted services dependent on immediate finality, such as XSig’s multi-signature wallet.
With the integration of threshold block signatures, the network now achieves single-block hash finality. This improvement reduces the potential for reorgs and enhances the sidechain’s usability and security.
Developers interested in experimenting with the MEV-resistant EVM environment can explore available documentation or join the official Neo Discord server for further engagement.
The full announcement can be found at the link below:
https://medium.com/neo-smart-economy/anti-mev-feature-now-live-on-neo-x-testnet-6f3cf667e794
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