# Haust Network

Markdown version of https://l2beat.com/layer2s/projects/haust

## Summary

- Total Value Secured: $10.69 M (-0.31% compared to seven days ago; canonically bridged $10.69 M, natively minted $0.00, externally bridged $0.00; 0.00% with additional trust assumptions compared to the tokens involved and the Stage assigned to the project's canonical messaging bridge)
  - **Warning:** The HAUST token associated with Haust Network accounts for 99.6% of the TVS! (sentiment: bad)
- Past day UOPS: 0.01 (+0.19% compared to seven days ago)
- Gas token: HAUST
- Type: Other
- Purpose: Exchange
- Host chain: Ethereum
- Chain ID: 3864

### Risks

- Sequencer failure: No mechanism (sentiment: bad)
- State validation: None (sentiment: bad)
- Data availability: External (sentiment: bad)
- Exit window: None (sentiment: bad)
- Proposer failure: Cannot withdraw (sentiment: bad)

### About

Haust Network is a Layer 2 blockchain built on the Polygon CDK, integrating with the Agglayer and Account Abstraction from the outset.

## Value Secured

Shown as an interactive chart or widget on [the HTML page](https://l2beat.com/layer2s/projects/haust#tvs).

- [TVS chart (JSON)](https://l2beat.com/api/scaling/tvs/haust)
- [TVS breakdown by token (JSON)](https://l2beat.com/api/scaling/tvs/haust/breakdown)

## Activity

Shown as an interactive chart or widget on [the HTML page](https://l2beat.com/layer2s/projects/haust#activity).

- [Activity chart (JSON)](https://l2beat.com/api/scaling/activity/haust)

## Milestones & Incidents

- 2025-09-27: [Haust Public Launch](https://x.com/HaustNetwork/status/1982805150260666681). Haust is live on mainnet, integrated with Agglayer.

## Risk summary

### Funds can be stolen if

1. the operator manipulates the L2 state, which is not validated on Ethereum, (CRITICAL)
2. a contract receives a malicious code upgrade. There is no delay on code upgrades (CRITICAL).

### Funds can be lost if

3. the accounting proof system for the bridge (pessimistic proofs, SP1) is implemented incorrectly.

### Users can be censored if

4. the operator refuses to include their transactions.

## Risk analysis

### Sequencer failure

No mechanism (sentiment: bad)

There is no mechanism to have transactions be included if the sequencer is down or censoring. Although the functionality exists in the code, it is currently disabled.

### State validation

None (sentiment: bad)

Currently the system permits invalid state roots. 'Pessimistic' proofs only validate the bridge accounting.

### Data availability

External (sentiment: bad)

Proof construction and state derivation rely fully on data that is NOT published onchain.

### Exit window

None (sentiment: bad)

There is no window for users to exit in case of an unwanted upgrade since contracts are instantly upgradable.

### Proposer failure

Cannot withdraw (sentiment: bad)

Only the whitelisted proposers can publish state roots on L1, so in the event of failure the withdrawals are frozen.

## Data availability

### Data is not stored on chain

Transaction data is kept off-chain. Bridge accounting is protected by pessimistic proofs while L2 state transitions are not proven on Ethereum.

## Upgrades & Governance

The regular upgrade process for shared system contracts and L2-specific validium contracts starts at the PolygonAdminMultisig. For the shared contracts, they schedule a transaction that targets the ProxyAdmin via the Timelock, wait for 3d and then execute the upgrade. An upgrade of the Layer 2 specific validium contract requires first adding a new rollupType through the Timelock and the AgglayerManager (defining the new implementation and verifier contracts). Now that the rollupType is created, either the local admin or the PolygonAdminMultisig can immediately upgrade the local system contracts to it. Chains using pessimistic proofs often have completely sovereign upgrade paths from the ones described here, but the shared contracts still remain relevant to them because they use them as escrow.

The PolygonSecurityCouncil can expedite the upgrade process by declaring an emergency state. This state pauses both the shared bridge and the AgglayerManager and allows for instant upgrades through the timelock. Accordingly, instant upgrades for all system contracts are possible with the cooperation of the SecurityCouncil. The emergency state has been activated 1 time(s) since inception.

Furthermore, the PolygonAdminMultisig is permissioned to manage the shared trusted aggregator (proposer and prover) for all participating Layer 2s, deactivate the emergency state, obsolete rollupTypes and manage operational parameters and fees in the AgglayerManager directly. The local admin of a specific Aggchain can manage their chain by choosing the trusted sequencer, manage forced batches and set the data availability config. For sovereign chains using pessimistic proofs they can manage any proof logic that might be used on top of the minimal pessimistic one. Creating new Layer 2s (of existing rollupType) is outsourced to the PolygonCreateRollupMultisig but can also be done by the PolygonAdminMultisig. Custom non-shared bridge escrows have their custom upgrade admins listed in the permissions section.

## Updates

Shown as an interactive chart or widget on [the HTML page](https://l2beat.com/layer2s/projects/haust#updates).

## Operator

### Users can't force any transaction

There is no general mechanism to force the sequencer to include the transaction.

**Risks**

- Users can be censored if the operator refuses to include their transactions.

## Withdrawals

### Regular messaging

The user initiates L2->L1 messages by submitting a regular transaction on this chain. When the block containing that transaction is settled, the message becomes available for processing on L1. ZK proofs are required to settle blocks.

**References**

- [AgglayerBridge.sol - source code, claimAsset function](https://etherscan.io/address/0x66E0120e3c965552a89AcC37b03f762624baC5Ad#code)

## Other considerations

### Shared bridge and Pessimistic Proofs

Polygon Agglayer uses a shared bridge escrow for Rollups, Validiums and external chains that opt in to participate in interoperability. Each participating chain needs to provide zk proofs to access any assets in the shared bridge. In addition to the full execution proofs that are used for the state validation of Rollups and Validiums, accounting proofs over the bridges state (Polygon calls them 'Pessimistic Proofs') are used by external chains (cdk-erigon-sovereign and cdk-opgeth-sovereign variants). Using the SP1 zkVM by Succinct, even projects without a full proof system on Ethereum are able to share the bridge with any other Aggchain without adding additional trust assumptions.

**Risks**

- Funds can be lost if the accounting proof system for the bridge (pessimistic proofs, SP1) is implemented incorrectly.
- Funds can be stolen if the operator manipulates the L2 state, which is not validated on Ethereum (CRITICAL).

**References**

- [Pessimistic Proof - Polygon Knowledge Layer](https://docs.polygon.technology/cdk/concepts/pessimistic-proofs)
- [Etherscan: AgglayerManager.sol - verifyPessimisticTrustedAggregator() function](https://etherscan.io/address/0x15cAF18dEd768e3620E0f656221Bf6B400ad2618#code#F1#L1300)

## Permissions

### Ethereum

#### Actors

##### PolygonAdminMultisig

Addresses: [0x242daE44F5d8fb54B198D03a94dA45B5a4413e21](https://etherscan.io/address/0x242daE44F5d8fb54B198D03a94dA45B5a4413e21)

A Multisig with 5/9 threshold. 
* Can upgrade **with 3d delay**
  * AgglayerGateway [via: Timelock with 3d delay (no delay if in emergency state) → SharedProxyAdmin]
  * AgglayerBridge [via: Timelock with 3d delay (no delay if in emergency state) → SharedProxyAdmin]
  * AgglayerManager [via: Timelock with 3d delay (no delay if in emergency state) → SharedProxyAdmin]
  * AgglayerGER [via: 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** [via: Timelock with 3d delay (no delay if in emergency state)]
  * add or update default aggchain verification keys (aggchainVkey) for any given selectors 
  * change the aggchainSigners and threshold (a multisig used for permissioned state transitions) 
  * freeze routes from proof selector to verifier / pessimisticVkey for pessimistic proofs 
* Can interact with AgglayerBridge
  * upgrade the implementation of wrapped tokens deployed by the bridge **with 3d delay** [via: Timelock with 3d delay (no delay if in emergency state)]
* Can interact with AgglayerManager
  * 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** [via: 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** [via: 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)]

##### AgglayerManager

Addresses: [0x5132A183E9F3CB7C848b0AAC5Ae0c4f0491B7aB2](https://etherscan.io/address/0x5132A183E9F3CB7C848b0AAC5Ae0c4f0491B7aB2)

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.
* Can upgrade **with no delay**
  * AggchainECDSAMultisig 

##### PolygonSecurityCouncil

Addresses: [0x37c58Dfa7BF0A165C5AAEdDf3e2EdB475ac6Dcb6](https://etherscan.io/address/0x37c58Dfa7BF0A165C5AAEdDf3e2EdB475ac6Dcb6)

A Multisig with 6/8 threshold. 
* Can interact with AgglayerManager
  * 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 

##### PolygonCreateRollupMultisig

Addresses: [0xC74eFc7fdb3BeC9c6930E91FFDF761b160dF79dB](https://etherscan.io/address/0xC74eFc7fdb3BeC9c6930E91FFDF761b160dF79dB)

A Multisig with 3/5 threshold. 
* Can interact with AgglayerManager
  * deploy new projects that use predefined rollup types (implementations) and connect them or other Agglayer chains to the PolygonRollupManager 

##### EOA 1

Addresses: [0xc68685bBcb11F05ACE5117f9693a073be5fb55Ca](https://etherscan.io/address/0xc68685bBcb11F05ACE5117f9693a073be5fb55Ca)

* Can interact with AggchainECDSAMultisig
  * set the trusted sequencer address 

##### EOA 2

Addresses: [0xd4eb5EcF61FF2eCFA9069787ED14820E9A53bF2b](https://etherscan.io/address/0xd4eb5EcF61FF2eCFA9069787ED14820E9A53bF2b)

* Can interact with AggchainECDSAMultisig
  * sign state transitions (replaces state validation for this aggchain) 

##### EOA 3

Addresses: [0x20A53dCb196cD2bcc14Ece01F358f1C849aA51dE](https://etherscan.io/address/0x20A53dCb196cD2bcc14Ece01F358f1C849aA51dE)

* Can interact with AgglayerManager
  * Permissioned to post new state roots and global exit roots accompanied by ZK proofs 

## Smart contracts

### Ethereum

#### AggchainECDSAMultisig

Addresses: [0xaD83Cd3e5A725546daDC5A25088c5c098d320Ca8](https://etherscan.io/address/0xaD83Cd3e5A725546daDC5A25088c5c098d320Ca8#code), [0x0D49fD0d79723e4D24AaC83f604ED2D3d5fC0f21](https://etherscan.io/address/0x0D49fD0d79723e4D24AaC83f604ED2D3d5fC0f21#code) (Implementation (Upgradable)), [0x5132A183E9F3CB7C848b0AAC5Ae0c4f0491B7aB2](https://etherscan.io/address/0x5132A183E9F3CB7C848b0AAC5Ae0c4f0491B7aB2#code) (Admin)

System contract defining the Haust Network Aggchain logic. It only enforces bridge accounting (pessimistic) proofs to protect the shared bridge while the Aggchain state transitions are not proven. They must instead be signed by 1 aggchainSigner(s).
* Roles:
  * **admin**: AgglayerManager, EOA 1
  * **aggchainSigners**: EOA 2

Can be upgraded by: AgglayerManager with no delay

#### AgglayerGateway

Addresses: [0x046Bb8bb98Db4ceCbB2929542686B74b516274b3](https://etherscan.io/address/0x046Bb8bb98Db4ceCbB2929542686B74b516274b3#code), [0xD062B7f9fbB89bdA59262E77015C34a27Dc9aB49](https://etherscan.io/address/0xD062B7f9fbB89bdA59262E77015C34a27Dc9aB49#code) (Implementation (Upgradable)), [0x0F99738B2Fc14D77308337f3e2596b63aE7BCC4A](https://etherscan.io/address/0x0F99738B2Fc14D77308337f3e2596b63aE7BCC4A#code) (Admin)

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
  * **alMultisig**: PolygonAdminMultisig
  * **freezePpRoute**: PolygonAdminMultisig

Can be upgraded by: PolygonAdminMultisig with 3d delay

#### AgglayerBridge

Addresses: [0x2a3DD3EB832aF982ec71669E178424b10Dca2EDe](https://etherscan.io/address/0x2a3DD3EB832aF982ec71669E178424b10Dca2EDe#code), [0x66E0120e3c965552a89AcC37b03f762624baC5Ad](https://etherscan.io/address/0x66E0120e3c965552a89AcC37b03f762624baC5Ad#code) (Implementation (Upgradable)), [0x0F99738B2Fc14D77308337f3e2596b63aE7BCC4A](https://etherscan.io/address/0x0F99738B2Fc14D77308337f3e2596b63aE7BCC4A#code) (Admin)

The shared bridge contract, escrowing user funds sent to Agglayer chains. 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

Can be upgraded by: PolygonAdminMultisig with 3d delay

#### AgglayerGER

Addresses: [0x580bda1e7A0CFAe92Fa7F6c20A3794F169CE3CFb](https://etherscan.io/address/0x580bda1e7A0CFAe92Fa7F6c20A3794F169CE3CFb#code), [0x7F1655d9d570167B2a3FfD1Ef809D3Fdd74427C5](https://etherscan.io/address/0x7F1655d9d570167B2a3FfD1Ef809D3Fdd74427C5#code) (Implementation (Upgradable)), [0x0F99738B2Fc14D77308337f3e2596b63aE7BCC4A](https://etherscan.io/address/0x0F99738B2Fc14D77308337f3e2596b63aE7BCC4A#code) (Admin)

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

Can be upgraded by: PolygonAdminMultisig with 3d delay

#### Timelock

Addresses: [0xEf1462451C30Ea7aD8555386226059Fe837CA4EF](https://etherscan.io/address/0xEf1462451C30Ea7aD8555386226059Fe837CA4EF#code)

A timelock with access control. In the case of an activated emergency state in the AgglayerManager, 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)

#### SP1Verifier

Addresses: [0x0459d576A6223fEeA177Fb3DF53C9c77BF84C459](https://etherscan.io/address/0x0459d576A6223fEeA177Fb3DF53C9c77BF84C459#code)

Verifier contract for SP1 proofs (v5.0.0).


#### SharedProxyAdmin

Addresses: [0x0F99738B2Fc14D77308337f3e2596b63aE7BCC4A](https://etherscan.io/address/0x0F99738B2Fc14D77308337f3e2596b63aE7BCC4A#code)

* Roles:
  * **owner**: Timelock

#### BridgeLib

Addresses: [0x3622Fcf450ca40a340b7492Ae5F60E7c7Ea68aB3](https://etherscan.io/address/0x3622Fcf450ca40a340b7492Ae5F60E7c7Ea68aB3#code)

Extension contract of the AgglayerBridge for asset metadata..


#### SP1Verifier

Addresses: [0xc3c6dDDAc8829b233Dc6536Ec024775a57b0AF2A](https://etherscan.io/address/0xc3c6dDDAc8829b233Dc6536Ec024775a57b0AF2A#code)

Verifier contract for SP1 proofs (v6.1.0).


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).