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X Layer
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About
X Layer is a Layer 2 by OKX with seamless integration with OKX products. It is powered by the Polygon CDK.
Badges
About
X Layer is a Layer 2 by OKX with seamless integration with OKX products. It is powered by the Polygon CDK.
Why is the project listed in others?
Consequence: projects without a sufficiently decentralized data availability committee rely on few entities to safely attest data availability on Ethereum. A small set of entities can collude with the proposer to finalize an unavailable state, which can cause loss of funds.
Consequence: projects without a proper proof system fully rely on single entities to safely update the state. A malicious proposer can finalize an invalid state, which can cause loss of funds.
Learn more about the recategorisation here.
2024 Aug 29 — 2025 Aug 28
2024 Aug 28 — 2025 Aug 27
There is no mechanism to have transactions be included if the sequencer is down or censoring.
Currently the system permits invalid state roots. ‘Pessimistic’ proofs only validate the bridge accounting.
Proof construction and state derivation rely fully on data that is NOT published onchain.
There is no window for users to exit in case of an unwanted regular upgrade since contracts are instantly upgradable.
Only the whitelisted proposers can publish state roots on L1, so in the event of failure the withdrawals are frozen.
Ethereum
Roles:
Permissioned to post new state roots and global exit roots accompanied by ZK proofs.
Actors:
A Multisig with 5/12 threshold.
- Can upgrade with 3d delay
- AggLayerGateway Timelock with 3d delay (no delay if in emergency state) → SharedProxyAdmin
- PolygonSharedBridge Timelock with 3d delay (no delay if in emergency state) → SharedProxyAdmin
- PolygonRollupManager Timelock with 3d delay (no delay if in emergency state) → SharedProxyAdmin
- PolygonGlobalExitRootV2 Timelock with 3d delay (no delay if in emergency state) → SharedProxyAdmin
- Can interact with AggLayerGateway
- add new routes from proof selector to verifier / pessimisticVkey for pessimistic proofs with 3d delay Timelock with 3d delay (no delay if in emergency state)
- add or update default aggchain verification keys (aggchainVkey) for any given selectors
- freeze routes from proof selector to verifier / pessimisticVkey for pessimistic proofs
- Can interact with PolygonSharedBridge
- upgrade the implementation of wrapped tokens deployed by the bridge with 3d delay Timelock with 3d delay (no delay if in emergency state)
- Can interact with PolygonRollupManager
- deploy new projects that use predefined rollup types (implementations) and connect them or other Agglayer chains to the PolygonRollupManager
- manage all access control roles, add new rollup types (which are implementation contracts that can then be upgraded to by connected projects), update any connected projects to new rollup types, migrate to pessimistic proofs and rollback batches, connect existing rollups to the PolygonRollupManager with 3d delay Timelock with 3d delay (no delay if in emergency state)
- manage parameters like fees for all connected projects, set the trusted aggregator, stop the emergency state, update projects and obsolete rollup types
- Can interact with Timelock
- propose, cancel and execute transactions in the timelock, manage all access control roles and change the minimum delay with 6d delay or with 3d delay Timelock with 3d delay (no delay if in emergency state) with 3d delay (no delay if in emergency state) - or - acting directly with 3d delay (no delay if in emergency state)
Participants (12):
0xcAB3…62f90xAb35…235E0x54c4…65d90x2161…d4170xED7c…B5a20xdFEd…56Da0xffbf…32380xeD44…dB370x516e…46B70x4c16…88910xA0B0…f2270xEad7…9dB2A Multisig with 6/8 threshold.
- Can interact with PolygonRollupManager
- activate the emergency state in the PolygonRollupManager and in the shared bridge immediately, effectively pausing all projects connected to them and making system contracts instantly upgradable
Participants (8):
0xFe45…2e4b0xaF46…261D0xBDc2…FEFf0x4c16…88910x3ab9…D6220x49c1…0E860x9F7d…86A00x2188…1C28A Multisig with 3/8 threshold.
- Can interact with PolygonRollupManager
- deploy new projects that use predefined rollup types (implementations) and connect them or other Agglayer chains to the PolygonRollupManager
Participants (8):
0xAb35…235E0x3038…D3b50xa439…AE310xD947…fCFC0xCE27…AaAc0x0B84…Ca770x0185…22A60x7316…4496- Can interact with PolygonPessimisticConsensus
- sole address that can force batches
- Can interact with PolygonPessimisticConsensus
- must provide a signature for each pessimistic proof, attesting to a valid state transition
- Can interact with PolygonPessimisticConsensus
- set the trusted sequencer address
Ethereum
A verifier gateway for pessimistic proofs. Manages a map of chains and their verifier keys and is used to route proofs based on the first 4 bytes of proofBytes data in a proof submission. The SP1 verifier is used for all proofs.
- Roles:
- addPpRoute: Timelock; ultimately PolygonAdminMultisig
- admin: SharedProxyAdmin; ultimately PolygonAdminMultisig
- aggchainDefaultVKey: PolygonAdminMultisig
- freezePpRoute: PolygonAdminMultisig
The shared bridge contract, escrowing user funds sent to Agglayer participants. It is usually mirrored on each chain and can be used to transfer both ERC20 assets and arbitrary messages.
- Roles:
- admin: SharedProxyAdmin; ultimately PolygonAdminMultisig
- proxiedTokensManager: Timelock; ultimately PolygonAdminMultisig
- This contract can store any token.
The central shared managing contract for Polygon Agglayer chains. This contract coordinates chain deployments and proof validation. All connected Layer 2s can be globally paused by activating the ‘Emergency State’. This can be done by the PolygonSecurityCouncil or by anyone after 1 week of inactive verifiers.
- Roles:
- admin: SharedProxyAdmin; ultimately PolygonAdminMultisig
- createRollup: PolygonAdminMultisig, PolygonCreateRollupMultisig
- defaultAdmin: Timelock; ultimately PolygonAdminMultisig
- emergencyCouncilAdmin: PolygonSecurityCouncil
- trustedAggregator: EOA 4, EOA 5
- tweakParameters: PolygonAdminMultisig
A merkle tree storage contract aggregating state roots of each participating Layer 2, thus creating a single global merkle root representing the global state of the Agglayer, the ‘global exit root’. The global exit root is synchronized to all connected Layer 2s to help with their interoperability.
- Roles:
- admin: SharedProxyAdmin; ultimately PolygonAdminMultisig
A timelock with access control. In the case of an activated emergency state in the PolygonRollupManager, all transactions through this timelock are immediately executable. The current minimum delay is 3d.
- Roles:
- timelockAdmin: PolygonAdminMultisig (no delay if in emergency state), Timelock (no delay if in emergency state); ultimately PolygonAdminMultisig (no delay if in emergency state)
Value Secured is calculated based on these smart contracts and tokens:
The current deployment carries some associated risks:
Funds can be stolen if a contract receives a malicious code upgrade. There is no delay on code upgrades (CRITICAL).