{
"consensusAlgorithm": {
"name": "CometBFT",
"description": "CometBFT is the canonical implementation of the Tendermint consensus algorithm.\n CometBFT allows for a state transition machine to be written in any programming language, and it allows for secure replication across many machines.\n The consensus protocol is fork-free by construction under an honest majority of stake assumption.",
"blockTime": 6,
"consensusFinality": 1,
"unbondingPeriod": 1213200
},
"dataAvailabilitySampling": {
"erasureCodingScheme": "2D Reed-Solomon",
"erasureCodingProof": "Fraud proofs"
},
"economicSecurity": {
"token": {
"symbol": "TIA",
"decimals": 6,
"coingeckoId": "celestia"
}
},
"finality": 6,
"pruningWindow": 608400,
"risks": {
"economicSecurity": {
"value": {
"value": "Staked assets",
"sentiment": "good",
"description": "There are staked assets on the DA layer that can be slashed in case of a data withholding attack. A dishonest supermajority of validators must collude to finalize a block with missing or invalid data. The invalid block would be added to the chain but rejected by honest full nodes.\n "
},
"adjustSecurityRisk": true
},
"fraudDetection": {
"value": "DAS",
"sentiment": "warning",
"description": "The DA layer uses data availability sampling (DAS) to protect against data withholding attacks. However, the block reconstruction protocol, which enables the minimum number of light nodes to collectively reconstruct the block, is still under development.",
"secondLine": ""
}
},
"sovereignProjectsTrackingConfig": [
{
"projectId": "battle-for-blockchain",
"name": "Battle for Blockchain",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5047670,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAKzFLTn1xOipecg="
}
]
},
{
"projectId": "bullet",
"name": "Bullet",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 10168980,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAGJsdGJhdGNoLWw="
},
{
"type": "celestia",
"sinceBlock": 10183821,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAGJsdGJhdGNoLXQ="
},
{
"type": "celestia",
"sinceBlock": 10456208,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAGJsdGJhdGNoLXo="
}
]
},
{
"projectId": "camp",
"name": "Camp",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 6459709,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAAB7AAAAAAAAAeQ="
}
]
},
{
"projectId": "civitia",
"name": "Civitia",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 4492300,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAEwLOhV+kOUlUq4="
}
]
},
{
"projectId": "clique",
"name": "Clique",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 3161819,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAARQV7t6sd4A="
}
]
},
{
"projectId": "echelon",
"name": "Echelon",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5659637,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAItyY42OaTC/skE="
}
]
},
{
"projectId": "echos",
"name": "Echos",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 3161819,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAA/cZMN1XLG8="
}
]
},
{
"projectId": "eden",
"name": "Eden",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 9409947,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAORr5sRrVhwIjmU="
},
{
"type": "celestia",
"sinceBlock": 9413424,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAAoxK5AW18ozObY="
}
]
},
{
"projectId": "embr-fun",
"name": "Embr.fun",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5954601,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAMbONmnisjTDz4I="
}
]
},
{
"projectId": "flame",
"name": "Flame",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 3161819,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAL2dxfeNrJ+tg6Y="
}
]
},
{
"projectId": "flynet",
"name": "Flynet",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5188001,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAAAACyPE7Ql9zwA="
}
]
},
{
"projectId": "forma",
"name": "Forma",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 3161819,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAKKnitomrCy/HoY="
}
]
},
{
"projectId": "foundation-network",
"name": "Foundation Network",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 3667737,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAN/xAxpagCrjLVQ="
}
]
},
{
"projectId": "hibachi",
"name": "Hibachi",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5979823,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAABoaWJhY2hpLXM="
},
{
"type": "celestia",
"sinceBlock": 5981133,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAGhpYmFjaGk="
}
]
},
{
"projectId": "ing",
"name": "ING",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5945453,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAALdhUSKgKHU0Zx0="
}
]
},
{
"projectId": "inertia",
"name": "Inertia",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5941532,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAEg2If2QGyq4ZRQ="
}
]
},
{
"projectId": "intergaze",
"name": "Intergaze",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5748411,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAIoZCJNLh1XvOZA="
}
]
},
{
"projectId": "milkyway",
"name": "Milkyway",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5298640,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAB2AZsEwLd1LLHk="
}
]
},
{
"projectId": "onchain",
"name": "Onchain",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 3161819,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAAAABNfLrOLSCTY="
}
]
},
{
"projectId": "perennial",
"name": "Perennial",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 3886561,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAaToZYrE0tA="
}
]
},
{
"projectId": "rave",
"name": "Rave",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5645296,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAF45zaUciayEPXE="
}
]
},
{
"projectId": "relay-chain",
"name": "Relay Chain",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 9272873,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAHJlbGF5LWRhdGE="
}
]
},
{
"projectId": "rena",
"name": "Rena",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5775045,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAMxohfftlR5t59s="
}
]
},
{
"projectId": "rivalz-network",
"name": "Rivalz Network",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 4932528,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAMJ/xGlNMdE="
}
]
},
{
"projectId": "xo-market",
"name": "XO Market",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 8164261,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAACnGTcXcpKRnenc="
},
{
"type": "celestia",
"sinceBlock": 8383370,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAEjr00EdZDGvoMU="
}
]
},
{
"projectId": "yominet",
"name": "Yominet",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5966190,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAFjh+OUc/ORU/0o="
}
]
},
{
"projectId": "zaar",
"name": "Zaar",
"daTrackingConfig": [
{
"type": "celestia",
"sinceBlock": 5587852,
"namespace": "AAAAAAAAAAAAAAAAAAAAAAAAAM8NBxiaOQwFwQc="
}
]
}
],
"systemCategory": "public",
"technology": {
"description": "## Architecture\n\n\n\n## Consensus\nCelestia uses CometBFT, the canonical implementation of Tendermint consensus protocol. The consensus protocol is fork-free by construction under an honest majority of stake assumption.\nCelestia achieves finality at each block, with an average time between blocks of 6 seconds.\n## Blobs\nIn Celestia, blobs are user-submitted data that do not modify the blockchain state. \nEach blob has two components, one is a binary object of raw data bytes, and the other is the namespace of the specific application for which the blob data is intended for.\n\n\n\n\nAll data posted in a Celestia blob is divided into chunks of fixed size, called shares, and each blob is arranged in a k * k matrix of shares. The maximum original square size is 512 (k = 512), for a total of 262,144 shares.\n\n\n\n\nCelestia shares' rows and columns are erasure-coded into a 2k * 2k matrix and committed to in a Namespaced Merkle Trees (NMTs), a version of a standard Merkle tree using a namespaced hash function. \nIn NMTs, every node in the tree includes the range of namespaces of all its child nodes, allowing applications to request and retrieve data for a specific namespace sub-tree while maintaining all functionalities (e.g., inclusion and range proofs) of a standard Merkle tree.\n\n\n\n\nUltimately, a single data root (availableDataRoot) of the Merkle tree is computed with the row and column roots as leaves. This data root is included in the block header as the root of commitments to erasure-coded data so that individual shares in the matrix can be proven to belong to a single data root.\n\n\n\n\n## Data Availability Sampling (DAS)\n\nTo ensure data availability, Celestia light nodes perform sampling on the 2k x 2k data matrix. Each light node randomly selects a set of unique coordinates within the extended matrix and requests the corresponding data shares and Merkle proofs from full nodes.\nCurrently, a Celestia light node must perform a minimum of 16 samples before declaring that a block is available.\nThis sampling rate ensures that given the minimum number of unavailable shares, a light client will sample at least one unavailable share with a 99% probability.\n\nFor more details on DAS probabilistic analysis, see the Fraud and Data Availability Proofs paper.\n\n\n\n\n## Erasure Coding Proof\nLight nodes performing data availability sampling must have the guarantee that the sampled data is erasure coded correctly. In Celestia, light nodes can be notified of a maliciously encoded block through Bad Encoding Fraud Proofs (BEFPs). Full nodes receiving invalid erasure-coded data can generate a fraud-proof to be transmitted to all light and full nodes in the DA network. The proof is generated by full nodes reconstructing the original data from the block data, and verifying that the recomputed data root matches the data root of the block header. \nUpon receiving and verifying the BEFP, all Celestia nodes should halt providing services (e.g., submitTx).\n\n## L2s Data Availability\nL2s can post data to Celestia by submitting blobs through a payForBlobs transaction. The transaction can include data as a single blob or multiple blobs, with the total maximum size determined by the maximum block size. The transaction fee is determined by the size of the data and the current gas price. \nApplications can then retrieve the data by querying the Celestia blockchain for the data root of the blob and the namespace of the application. The data can be reconstructed by querying the Celestia network for the shares of the data matrix and reconstructing the data using the erasure coding scheme.",
"references": [
{
"title": "Celestia Specifications",
"url": "https://celestiaorg.github.io/celestia-app/data_structures.html"
},
{
"title": "Celestia Core - CometBFT",
"url": "https://github.com/celestiaorg/celestia-core"
},
{
"title": "Celestia Node - Data Retrieval",
"url": "https://github.com/celestiaorg/celestia-node/blob/9ff58570ef86e505b718abfc755fd18643a2284c/share/eds/retriever.go#L60"
},
{
"title": "Bad Encoding Fraud Proofs",
"url": "https://github.com/celestiaorg/celestia-node/blob/main/docs/adr/adr-006-fraud-service.md"
},
{
"title": "Fraud and Data Availability Proofs paper",
"url": "https://arxiv.org/pdf/1809.09044"
}
],
"risks": [
{
"category": "Funds can be lost if",
"text": "a dishonest supermajority of Celestia validators finalizes an unavailable block, and there aren't light nodes on the network verifying data availability, or they fail at social signaling unavailable data."
},
{
"category": "Funds can be lost if",
"text": "a dishonest supermajority of Celestia validators finalizes an unavailable block, and the light nodes on the network cannot collectively reconstruct the block."
}
]
},
"throughput": [
{
"size": 33554432,
"frequency": 6,
"sinceTimestamp": 1764802980
},
{
"size": 8388608,
"frequency": 6,
"sinceTimestamp": 1738022400
},
{
"size": 1974272,
"frequency": 6,
"sinceTimestamp": 1733961600
},
{
"size": 1974272,
"frequency": 12,
"sinceTimestamp": 1698710400
}
],
"type": "Public Blockchain",
"usedWithoutBridgeIn": [
{
"id": "ancient",
"name": "Ancient8",
"slug": "ancient8"
},
{
"id": "b3",
"name": "B3",
"slug": "b3"
},
{
"id": "lyra",
"name": "Derive",
"slug": "derive"
},
{
"id": "eclipse",
"name": "Eclipse",
"slug": "eclipse"
},
{
"id": "karak",
"name": "K2",
"slug": "k2"
},
{
"id": "lightlink",
"name": "LightLink",
"slug": "lightlink"
},
{
"id": "mantapacific",
"name": "Manta Pacific",
"slug": "mantapacific"
},
{
"id": "nillion",
"name": "Nillion",
"slug": "nillion"
},
{
"id": "orderly",
"name": "Orderly Network",
"slug": "orderly"
},
{
"id": "river",
"name": "Towns",
"slug": "towns"
}
],
"validators": {
"type": "dynamic"
}
}
karak+63-18
statuses+2-1
{
"unverifiedContracts": []
"unverifiedContracts": [],
"yellowWarning": "K2 has been shut down. On 2026-09-15 the OptimismPortal and L1StandardBridge were upgraded to disable deposits and standard withdrawals: escrowed ETH and ERC20s can only be claimed on L1 with a Merkle proof against roots set by the KarakMultisig, which can recover all remaining funds after 2027-09-12. No claim interface or Merkle tree has been published. The only public notice is a [Discord announcement from November 2025](https://farcaster.xyz/pranjal/0x030bd1ba) asking users to unstake and bridge out by 2025-12-31."
}
milestones+7-0
[
{
"title": "K2 shut down, exits replaced by Merkle claims",
"url": "https://etherscan.io/tx/0x59515cbe7245d0856751523549d7b4524beb5f31930b2bc7bc3016b8071e65fd",
"date": "2026-09-15T00:00:00Z",
"description": "Batch posting stopped; bridge contracts only allow Merkle-proof claims of escrowed funds.",
"type": "incident"
},
{
"title": "Karak rebrands to OpenGDP",
"url": "https://x.com/OpenGDP/status/1990437951529226293",
"date": "2025-11-17T00:00:00Z",
"description": "Karak rebrands to OpenGDP.",
"type": "general"
},
{
"title": "K2 Network Early Access Launch",
"url": "https://x.com/Karak_Network/status/1762561646999068899?s=20",
"date": "2024-02-27T00:00:00Z",
"description": "K2 Network is live on mainnet.",
"type": "general"
}
]
{
"architectureImage": "opstack-optimium",
"dataAvailability": [
{
"name": "Data is posted to Celestia",
"description": "Transactions roots are posted onchain and the full data is posted on Celestia. Since the Blobstream bridge is not used, availability of the data is not verified against Celestia validators, meaning that the Sequencer can single-handedly publish unavailable roots.",
"risks": [
{
"category": "Funds can be lost if",
"text": "the sequencer posts an unavailable transaction root.",
"isCritical": true
},
{
"category": "Funds can be lost if",
"text": "the data is not available on the external provider.",
"isCritical": true
}
],
"references": [
{
"title": "Introducing Blobstream: streaming modular DA to Ethereum",
"url": "https://blog.celestia.org/introducing-blobstream/"
},
{
"title": "Derivation: Batch submission - OP Mainnet specs",
"url": "https://github.com/ethereum-optimism/specs/blob/main/specs/protocol/derivation.md#batch-submission"
},
{
"title": "BatchInbox - address",
"url": "https://etherscan.io/address/0xff00000000000000000000000000000000002410#code"
},
{
"title": "OptimismPortal.sol - source code, depositTransaction function",
"url": "https://etherscan.io/address/0x3fe449Ef47228F03f979F9D955196494243cdf7E#code"
"url": "https://etherscan.io/address/0xB1762246367681e5b335968950e8A17b0c56021D#code"
}
]
}
],
"exitMechanisms": [
{
"name": "Regular messaging",
"description": "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. The process of block finalization takes a challenge period of 3d to complete.",
"risks": [
{
"category": "Funds can be frozen if",
"text": "the centralized validator goes down. Users cannot produce blocks themselves and exiting the system requires new block production.",
"isCritical": true
}
],
"references": [
{
"title": "OptimismPortal.sol - source code, proveWithdrawalTransaction function",
"url": "https://etherscan.io/address/0x3fe449Ef47228F03f979F9D955196494243cdf7E#code"
"url": "https://etherscan.io/address/0xB1762246367681e5b335968950e8A17b0c56021D#code"
},
{
"title": "OptimismPortal.sol - source code, finalizeWithdrawalTransaction function",
"url": "https://etherscan.io/address/0x3fe449Ef47228F03f979F9D955196494243cdf7E#code"
"url": "https://etherscan.io/address/0xB1762246367681e5b335968950e8A17b0c56021D#code"
},
{
"title": "L2OutputOracle.sol - source code, PROPOSER check",
"url": "https://etherscan.io/address/0x394317B191f5c7A371e74594776B1EfDc33d10D6#code"
}
]
},
{
"name": "Forced messaging",
"description": "If the user experiences censorship from the operator with regular L2->L1 messaging they can submit their messages directly on L1. The system is then obliged to service this request or halt all messages, including forced withdrawals from L1 and regular messages initiated on L2. Once the force operation is submitted and if the request is serviced, the operation follows the flow of a regular message.",
"risks": [],
"references": [
{
"title": "Forced withdrawal from an OP Stack blockchain",
"url": "https://docs.optimism.io/stack/transactions/forced-transaction"
}
]
}
],
"forceTransactions": {
"name": "Users can force any transaction",
"description": "Because the state of the system is based on transactions submitted on the underlying host chain and anyone can submit their transactions there it allows the users to circumvent censorship by interacting with the smart contract on the host chain directly.",
"risks": [],
"references": [
{
"title": "Sequencing Window - OP Mainnet Specs",
"url": "https://github.com/ethereum-optimism/optimism/blob/51eeb76efeb32b3df3e978f311188aa29f5e3e94/specs/glossary.md#sequencing-window"
},
{
"title": "OptimismPortal.sol - source code, depositTransaction function",
"url": "https://etherscan.io/address/0x3fe449Ef47228F03f979F9D955196494243cdf7E#code"
"url": "https://etherscan.io/address/0xB1762246367681e5b335968950e8A17b0c56021D#code"
}
]
},
"operator": {
"name": "The system has a centralized operator",
"description": "The operator is the only entity that can propose blocks. A live and trustworthy operator is vital to the health of the system.",
"risks": [
{
"category": "MEV can be extracted if",
"text": "the operator exploits their centralized position and frontruns user transactions."
}
],
"references": [
{
"title": "L2OutputOracle.sol - source code, CHALLENGER address",
"url": "https://etherscan.io/address/0x394317B191f5c7A371e74594776B1EfDc33d10D6#code"
},
{
"title": "L2OutputOracle.sol - source code, PROPOSER address",
"url": "https://etherscan.io/address/0x394317B191f5c7A371e74594776B1EfDc33d10D6#code"
}
]
},
"otherConsiderations": [
{
"name": "EVM compatible smart contracts are supported",
"description": "OP stack chains are pursuing the EVM Equivalence model. No changes to smart contracts are required regardless of the language they are written in, i.e. anything deployed on L1 can be deployed on L2.",
"risks": [],
"references": [
{
"title": "Introducing EVM Equivalence",
"url": "https://medium.com/ethereum-optimism/introducing-evm-equivalence-5c2021deb306"
}
]
}
],
"stateValidation": {
"categories": [
{
"title": "No state validation",
"description": "OP Stack projects can use the OP fault proof system, already being deployed on some. This project though is not using fault proofs yet and is relying on the honesty of the permissioned Proposer and Challengers to ensure state correctness. The smart contract system permits invalid state roots.",
"risks": [
{
"category": "Funds can be stolen if",
"text": "an invalid state root is submitted to the system.",
"isCritical": true
}
],
"references": [
{
"title": "L2OutputOracle.sol - source code, deleteL2Outputs function",
"url": "https://etherscan.io/address/0x394317B191f5c7A371e74594776B1EfDc33d10D6#code"
}
]
}
]
},
"warning": "Fraud proof system is currently under development. Users need to trust the block proposer to submit correct L1 state roots."
}
{
"ethereum": {
"roles": [],
"actors": [
{
"id": "KarakMultisig",
"name": "KarakMultisig",
"description": "A Multisig with 3/5 threshold. \n* Can upgrade **with no delay**\n * L2OutputOracle [via: ProxyAdmin]\n * SystemConfig [via: ProxyAdmin]\n * L1ERC721Bridge [via: ProxyAdmin]\n * L1CrossDomainMessenger [via: ProxyAdmin]\n * L1StandardBridge [via: ProxyAdmin]\n * OptimismPortal [via: ProxyAdmin]\n * OptimismMintableERC20Factory [via: ProxyAdmin]\n* Can interact with L2OutputOracle\n * Allowed to challenge or delete state roots proposed by a Proposer \n* Can interact with SystemConfig\n * it can update the preconfer address, the batch submitter (Sequencer) address and the gas configuration of the system \n* Can interact with OptimismPortal\n * Allowed to pause withdrawals. In op stack systems with a proof system, the Guardian can also blacklist dispute games and set the respected game type (permissioned / permissionless) \n* Can interact with AddressManager\n * set and change address mappings [via: ProxyAdmin]",
"description": "A Multisig with 3/5 threshold. \n* Can upgrade **with no delay**\n * L2OutputOracle [via: ProxyAdmin]\n * SystemConfig [via: ProxyAdmin]\n * L1ERC721Bridge [via: ProxyAdmin]\n * L1CrossDomainMessenger [via: ProxyAdmin]\n * L1StandardBridge [via: ProxyAdmin]\n * OptimismPortal [via: ProxyAdmin]\n * OptimismMintableERC20Factory [via: ProxyAdmin]\n* Can interact with L2OutputOracle\n * Allowed to challenge or delete state roots proposed by a Proposer \n* Can interact with SystemConfig\n * it can update the preconfer address, the batch submitter (Sequencer) address and the gas configuration of the system \n* Can interact with L1StandardBridge\n * set merkleRoot, sweep the bridge's ETH into the OptimismPortal while claims are paused, and after the recovery timestamp withdraw all tokens and ETH \n* Can interact with OptimismPortal\n * set merkleRootETH, pause and unpause claims, and after RECOVERY_TIMESTAMP (while paused) withdraw the whole ETH balance \n* Can interact with AddressManager\n * set and change address mappings [via: ProxyAdmin]",
"accounts": [
{
"address": "eth:0x28A227d4faF0f4f75897438E24C43EF1CDABb920",
"type": "Contract",
"isVerified": true,
"name": "0x28A2…b920",
"url": "https://etherscan.io/address/0x28A227d4faF0f4f75897438E24C43EF1CDABb920"
}
],
"chain": "ethereum",
"references": [],
"participants": [
{
"address": "eth:0xAb86E21e9BFA559B93ca6f783362BFf5504f2cac",
"type": "EOA",
"isVerified": true,
"name": "0xAb86…2cac",
"url": "https://etherscan.io/address/0xAb86E21e9BFA559B93ca6f783362BFf5504f2cac"
},
{
"address": "eth:0x7E973c8f8aCDb71E4e00A19631739FFBF9748Cd0",
"type": "EOA",
"isVerified": true,
"name": "0x7E97…8Cd0",
"url": "https://etherscan.io/address/0x7E973c8f8aCDb71E4e00A19631739FFBF9748Cd0"
},
{
"address": "eth:0xBcB3EaB21eCe8864aFcC07f7613bD6D8bB5C28d3",
"type": "EOA",
"isVerified": true,
"name": "0xBcB3…28d3",
"url": "https://etherscan.io/address/0xBcB3EaB21eCe8864aFcC07f7613bD6D8bB5C28d3"
},
{
"address": "eth:0x988378eD49F538104fDBaC1A0ac2Edf9890EA4f2",
"type": "EOA",
"isVerified": true,
"name": "0x9883…A4f2",
"url": "https://etherscan.io/address/0x988378eD49F538104fDBaC1A0ac2Edf9890EA4f2"
},
{
"address": "eth:0x282DB123D1cbf5437c295EA0df0137E5FaDbD117",
"type": "EOA",
"isVerified": true,
"name": "0x282D…D117",
"url": "https://etherscan.io/address/0x282DB123D1cbf5437c295EA0df0137E5FaDbD117"
}
],
"discoveryDrivenData": true
},
{
"id": "EOA-1",
"name": "EOA 1",
"accounts": [
{
"address": "eth:0x4179f43f3b994e97090557363b09F403138a729e",
"type": "EOA",
"isVerified": true,
"name": "0x4179…729e",
"url": "https://etherscan.io/address/0x4179f43f3b994e97090557363b09F403138a729e",
"displayName": "EOA 1"
}
],
"chain": "ethereum",
"description": "* Can interact with L2OutputOracle\n * Allowed to post new state roots of the current layer to the host chain ",
"discoveryDrivenData": true
},
{
"id": "EOA-2",
"name": "EOA 2",
"accounts": [
{
"address": "eth:0x84BdFb21ed7C8B332a42bFD595744a84F3101e4E",
"type": "EOA",
"isVerified": true,
"name": "0x84Bd…1e4E",
"url": "https://etherscan.io/address/0x84BdFb21ed7C8B332a42bFD595744a84F3101e4E",
"displayName": "EOA 2"
}
],
"chain": "ethereum",
"description": "* Can interact with SystemConfig\n * Allowed to commit transactions from the current layer to the host chain ",
"discoveryDrivenData": true
}
]
}
}
contracts+20-6
{
"addresses": {
"ethereum": [
{
"name": "L2OutputOracle",
"isVerified": true,
"address": "eth:0x0a23342520Aa8Ca963c4201801F4D3E95e731637",
"upgradeability": {
"proxyType": "EIP1967 proxy",
"admins": [
"eth:0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C"
],
"implementations": [
"eth:0x394317B191f5c7A371e74594776B1EfDc33d10D6"
]
},
"chain": "ethereum",
"pastUpgrades": [
{
"timestamp": 1703143883,
"transactionHash": "0x0c0f24dc018c3729da70c02c63d573dfac8fe99a9937b31da75b64d3ec98c88e",
"implementations": [
"eth:0x394317B191f5c7A371e74594776B1EfDc33d10D6"
]
}
],
"description": "Contains a list of proposed state roots which Proposers assert to be a result of block execution. Currently only the PROPOSER address can submit new state roots.\n* Roles:\n * **admin**: ProxyAdmin; ultimately KarakMultisig\n * **challenger**: KarakMultisig\n * **proposer**: EOA 1",
"upgradableBy": [
{
"name": "KarakMultisig",
"delay": "no"
}
],
"discoveryDrivenData": true,
"url": "https://etherscan.io/address/0x0a23342520Aa8Ca963c4201801F4D3E95e731637#code"
},
{
"name": "SystemConfig",
"isVerified": true,
"address": "eth:0x622333688CC1878C7ff4205c89bDe051798788A7",
"upgradeability": {
"proxyType": "EIP1967 proxy",
"admins": [
"eth:0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C"
],
"implementations": [
"eth:0x01D5303F326B992845eef2782D4c9a7c6DdE4470"
]
},
"chain": "ethereum",
"pastUpgrades": [
{
"timestamp": 1703128511,
"transactionHash": "0xf5b7950924dfea5813bc7b14b1e0d19c87cd862ee9717f7d24806b92e57c5ada",
"implementations": [
"eth:0x01D5303F326B992845eef2782D4c9a7c6DdE4470"
]
}
],
"description": "Contains configuration parameters such as the Sequencer address, gas limit on this chain and the unsafe block signer address.\n* Roles:\n * **admin**: ProxyAdmin; ultimately KarakMultisig\n * **batcherHash**: EOA 2\n * **owner**: KarakMultisig",
"upgradableBy": [
{
"name": "KarakMultisig",
"delay": "no"
}
],
"discoveryDrivenData": true,
"url": "https://etherscan.io/address/0x622333688CC1878C7ff4205c89bDe051798788A7#code"
},
{
"name": "OptimismPortal",
"isVerified": true,
"address": "eth:0xeeCE9CD7Abd1CC84d9dfc7493e7e68079E47eA73",
"upgradeability": {
"proxyType": "EIP1967 proxy",
"admins": [
"eth:0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C"
],
"implementations": [
"eth:0x3fe449Ef47228F03f979F9D955196494243cdf7E"
"eth:0xB1762246367681e5b335968950e8A17b0c56021D"
]
},
"chain": "ethereum",
"pastUpgrades": [
{
"timestamp": 1703143967,
"transactionHash": "0x8a473670c3340bb6aa707beddf92664cf6d4ac8c79b785a6a0963531ba0e066d",
"implementations": [
"eth:0x3fe449Ef47228F03f979F9D955196494243cdf7E"
]
},
{
"timestamp": 1789447535,
"transactionHash": "0x59515cbe7245d0856751523549d7b4524beb5f31930b2bc7bc3016b8071e65fd",
"implementations": [
"eth:0xB1762246367681e5b335968950e8A17b0c56021D"
]
}
],
"description": "The main entry point to deposit funds from host chain to this chain. It also allows to prove and finalize withdrawals.\n* Roles:\n * **admin**: ProxyAdmin; ultimately KarakMultisig\n * **guardian**: KarakMultisig",
"description": "Modified OptimismPortal: deposits, proving and finalizing withdrawals are disabled. ETH held by the contract can only be claimed with a Merkle proof against merkleRootETH. After RECOVERY_TIMESTAMP and while claims are paused, the guardian can withdraw the whole ETH balance.\n* Roles:\n * **admin**: ProxyAdmin; ultimately KarakMultisig\n * **guardian**: KarakMultisig",
"upgradableBy": [
{
"name": "KarakMultisig",
"delay": "no"
}
],
"discoveryDrivenData": true,
"url": "https://etherscan.io/address/0xeeCE9CD7Abd1CC84d9dfc7493e7e68079E47eA73#code"
},
{
"name": "L1ERC721Bridge",
"isVerified": true,
"address": "eth:0x952851CecB07705A5bb483C1CE080F97e1E7491E",
"upgradeability": {
"proxyType": "EIP1967 proxy",
"admins": [
"eth:0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C"
],
"implementations": [
"eth:0xc4550911Df26E604aA560dee6a9b66D0CA933482"
]
},
"chain": "ethereum",
"pastUpgrades": [
{
"timestamp": 1703143415,
"transactionHash": "0x47bceb663a46c76e798b58969b6d6154ea215e03822c2a76faf0caeb34fb2216",
"implementations": [
"eth:0xc4550911Df26E604aA560dee6a9b66D0CA933482"
]
}
],
"description": "Used to bridge ERC-721 tokens from host chain to this chain.\n* Roles:\n * **admin**: ProxyAdmin; ultimately KarakMultisig",
"upgradableBy": [
{
"name": "KarakMultisig",
"delay": "no"
}
],
"discoveryDrivenData": true,
"url": "https://etherscan.io/address/0x952851CecB07705A5bb483C1CE080F97e1E7491E#code"
},
{
"name": "L1CrossDomainMessenger",
"isVerified": true,
"address": "eth:0x9BFfA66a8FcAAd7AC9ea7c7d4b9a6fc46777022d",
"upgradeability": {
"proxyType": "resolved delegate proxy",
"admins": [
"eth:0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C"
],
"implementations": [
"eth:0xc5c3DF92714aAf510F8dD9a4c9C67D35f7d7376b"
],
"immutable": false
},
"chain": "ethereum",
"pastUpgrades": [
{
"timestamp": 1703048687,
"transactionHash": "0x2fcb412e58cba3af863cd4a0397c65bf6347a726aae1d698b79aa30cdaf877fa",
"implementations": [
"eth:0x9BFfA66a8FcAAd7AC9ea7c7d4b9a6fc46777022d"
]
},
{
"timestamp": 1703143751,
"transactionHash": "0x99fc5a58e224a9b519ed673d54b977070cb7093fe0aeb7ac5b2a93b1a541727b",
"implementations": [
"eth:0xc5c3DF92714aAf510F8dD9a4c9C67D35f7d7376b"
]
}
],
"description": "Sends messages from host chain to this chain, and relays messages back onto host chain. In the event that a message sent from host chain to this chain is rejected for exceeding this chain's epoch gas limit, it can be resubmitted via this contract's replay function.\n* Roles:\n * **admin**: ProxyAdmin; ultimately KarakMultisig",
"upgradableBy": [
{
"name": "KarakMultisig",
"delay": "no"
}
],
"discoveryDrivenData": true,
"url": "https://etherscan.io/address/0x9BFfA66a8FcAAd7AC9ea7c7d4b9a6fc46777022d#code"
},
{
"name": "L1StandardBridge",
"isVerified": true,
"address": "eth:0xBA61F25dd9f2d5f02D01B1C2c1c5F0B14c4B48A3",
"upgradeability": {
"proxyType": "EIP1967 proxy",
"admins": [
"eth:0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C"
],
"implementations": [
"eth:0xC4De51792746960FC0ac78360b8e9c6E103F3B13"
"eth:0xF44B55E152e872FF5CbD3d9F3bd732F67d5B366A"
]
},
"chain": "ethereum",
"pastUpgrades": [],
"description": "The main entry point to deposit ERC20 tokens from host chain to this chain.\n* Roles:\n * **admin**: ProxyAdmin; ultimately KarakMultisig",
"description": "Modified L1StandardBridge: deposits and finalizing withdrawals are disabled. ERC20 tokens held by the contract can only be claimed with a Merkle proof against merkleRoot. After the recovery timestamp and while claims are paused (both read from OPTIMISM_PORTAL), the guardian can withdraw all tokens and ETH.\n* Roles:\n * **admin**: ProxyAdmin; ultimately KarakMultisig\n * **guardian**: KarakMultisig",
"upgradableBy": [
{
"name": "KarakMultisig",
"delay": "no"
}
],
"discoveryDrivenData": true,
"url": "https://etherscan.io/address/0xBA61F25dd9f2d5f02D01B1C2c1c5F0B14c4B48A3#code"
},
{
"name": "ProxyAdmin",
"isVerified": true,
"address": "eth:0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C",
"upgradeability": {
"proxyType": "immutable",
"admins": [],
"implementations": [],
"immutable": true
},
"chain": "ethereum",
"description": "* Roles:\n * **owner**: KarakMultisig",
"discoveryDrivenData": true,
"url": "https://etherscan.io/address/0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C#code"
},
{
"name": "OptimismMintableERC20Factory",
"isVerified": true,
"address": "eth:0xF04a74899FF4c4410fAF3B5faa29B8Fd199C13DB",
"upgradeability": {
"proxyType": "EIP1967 proxy",
"admins": [
"eth:0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C"
],
"implementations": [
"eth:0xe1863A873f61fDD16560cAa7692a2A994b51E76A"
]
},
"chain": "ethereum",
"pastUpgrades": [
{
"timestamp": 1703143547,
"transactionHash": "0xabefa8137a3edd703261a62514df2180cfe8251dea6867ab87386a0eb2f94281",
"implementations": [
"eth:0xe1863A873f61fDD16560cAa7692a2A994b51E76A"
]
}
],
"description": "A helper contract that generates OptimismMintableERC20 contracts on the network it's deployed to. OptimismMintableERC20 is a standard extension of the base ERC20 token contract designed to allow the L1StandardBridge contracts to mint and burn tokens. This makes it possible to use an OptimismMintableERC20 as this chain's representation of a token on the host chain, or vice-versa.\n* Roles:\n * **admin**: ProxyAdmin; ultimately KarakMultisig",
"upgradableBy": [
{
"name": "KarakMultisig",
"delay": "no"
}
],
"discoveryDrivenData": true,
"url": "https://etherscan.io/address/0xF04a74899FF4c4410fAF3B5faa29B8Fd199C13DB#code"
}
]
},
"escrows": [
{
"address": "0xeeCE9CD7Abd1CC84d9dfc7493e7e68079E47eA73",
"sinceTimestamp": 1703048687,
"tokens": [
"ETH"
],
"contract": {
"isVerified": true,
"address": "eth:0xeeCE9CD7Abd1CC84d9dfc7493e7e68079E47eA73",
"upgradeability": {
"proxyType": "EIP1967 proxy",
"admins": [
"eth:0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C"
],
"implementations": [
"eth:0x3fe449Ef47228F03f979F9D955196494243cdf7E"
"eth:0xB1762246367681e5b335968950e8A17b0c56021D"
]
},
"chain": "ethereum",
"pastUpgrades": [
{
"timestamp": 1703143967,
"transactionHash": "0x8a473670c3340bb6aa707beddf92664cf6d4ac8c79b785a6a0963531ba0e066d",
"implementations": [
"eth:0x3fe449Ef47228F03f979F9D955196494243cdf7E"
]
},
{
"timestamp": 1789447535,
"transactionHash": "0x59515cbe7245d0856751523549d7b4524beb5f31930b2bc7bc3016b8071e65fd",
"implementations": [
"eth:0xB1762246367681e5b335968950e8A17b0c56021D"
]
}
],
"description": "Main entry point for users depositing ETH.",
"upgradableBy": [
{
"name": "ProxyAdmin",
"delay": "no"
}
],
"url": "https://etherscan.io/address/0xeeCE9CD7Abd1CC84d9dfc7493e7e68079E47eA73#code"
},
"chain": "ethereum",
"includeInTotal": true,
"chainId": 1
},
{
"address": "0xBA61F25dd9f2d5f02D01B1C2c1c5F0B14c4B48A3",
"sinceTimestamp": 1703048687,
"tokens": "*",
"contract": {
"isVerified": true,
"address": "eth:0xBA61F25dd9f2d5f02D01B1C2c1c5F0B14c4B48A3",
"upgradeability": {
"proxyType": "EIP1967 proxy",
"admins": [
"eth:0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C"
],
"implementations": [
"eth:0xC4De51792746960FC0ac78360b8e9c6E103F3B13"
"eth:0xF44B55E152e872FF5CbD3d9F3bd732F67d5B366A"
]
},
"chain": "ethereum",
"pastUpgrades": [],
"description": "Main entry point for users depositing ERC20 token that do not require custom gateway.",
"upgradableBy": [
{
"name": "ProxyAdmin",
"delay": "no"
}
],
"url": "https://etherscan.io/address/0xBA61F25dd9f2d5f02D01B1C2c1c5F0B14c4B48A3#code"
},
"chain": "ethereum",
"includeInTotal": true,
"chainId": 1
}
],
"programHashes": [],
"risks": [
{
"category": "Funds can be stolen if",
"text": "a contract receives a malicious code upgrade. There is no delay on code upgrades.",
"isCritical": true
}
],
"zkVerifiers": []
}
[
{
"id": "aabca727",
"date": "Wed, 16 Sep 2026 14:50:15 GMT",
"timestamp": 1789570151,
"description": "K2 core bridge contracts replaced with a Merkle-claim exit mechanism; batch posting stopped.\n\nOptimismPortal implementation `0x3fe449Ef47228F03f979F9D955196494243cdf7E` (v1.10.0) → `0xB1762246367681e5b335968950e8A17b0c56021D` (v2.3.0), upgraded and paused by the KarakMultisig on 2026-09-15 04:45 UTC (tx `0x59515cbe7245d0856751523549d7b4524beb5f31930b2bc7bc3016b8071e65fd`). `depositTransaction()`, `receive()`, `proveWithdrawalTransaction()` and `finalizeWithdrawalTransaction()` now revert. Escrowed ETH (1876 ETH) is claimable via `claimETH(amount, proof)` against `merkleRootETH` = `0x6822879a8b8b0acb7a826beaec075d292958ffcb64c980959c0d0aea5ea0f8f9`, set on 2026-09-16 04:03 UTC (tx `0x2080dbdfa4798b9003dfe3e8b5bf8ea1772143eaf44acac1217002904eef87ec`, which also unpaused the portal); leaf = `keccak256(bytes.concat(keccak256(abi.encode(claimer, amount))))`, claims are cumulative per address. The Guardian can pause/unpause claims and, while paused and after `RECOVERY_TIMESTAMP` = 1820707200 (2027-09-12), call `recoverETH(recipient)` for the full balance.\nhttps://disco.l2beat.com/diff/eth:0x3fe449Ef47228F03f979F9D955196494243cdf7E/eth:0xB1762246367681e5b335968950e8A17b0c56021D\n\nL1StandardBridge implementation `0xC4De51792746960FC0ac78360b8e9c6E103F3B13` (v1.4.0) → `0xF44B55E152e872FF5CbD3d9F3bd732F67d5B366A` (v2.3.0) in the same tx. All deposit entrypoints and `finalizeBridgeETH()`/`finalizeBridgeERC20()` now revert. Escrowed ERC20s are claimable via `claimTokens(tokens[], amounts[], proof[])` against `merkleRoot` = `0x0747603ccf64fdae7c52f9e69c1bafbb8b171860812139d59972cd8d022e3840` (set 2026-09-16 04:03 UTC); leaf = `keccak256(bytes.concat(keccak256(abi.encode(claimer, tokens, amounts))))`, cumulative per claimer and token. The Guardian (read from the portal) can call `recoverTokens(recipient, tokens[])` under the same paused + `RECOVERY_TIMESTAMP` conditions, and `sweepETH()` while claims are paused to forward the bridge's ETH balance to the OptimismPortal.\nhttps://disco.l2beat.com/diff/eth:0xC4De51792746960FC0ac78360b8e9c6E103F3B13/eth:0xF44B55E152e872FF5CbD3d9F3bd732F67d5B366A\n\nBatcher `0x84BdFb21ed7C8B332a42bFD595744a84F3101e4E` last posted to the inbox on 2026-09-15 01:22:59 UTC; L2 blocks since then are empty sequencer-window blocks. Proposer `0x4179f43f3b994e97090557363b09F403138a729e` keeps posting output roots for them every 7200 blocks (last 2026-09-16 13:49 UTC, L2 block 43063200). Last withdrawal initiated on L2 2026-09-13 18:51 UTC; withdrawals not finalized before the upgrade cannot be finalized. No claims executed yet; no public Merkle tree or announcement of the claim mechanism found.",
"isHighSeverity": true,
"changeCount": 26,
"sections": [
{
"kind": "watched-changes",
"body": "```diff\n contract KarakMultisig (eth:0x28A227d4faF0f4f75897438E24C43EF1CDABb920) [GnosisSafe] {\n +++ description: None\n receivedPermissions.3:\n+ {\"permission\":\"interact\",\"from\":\"eth:0xBA61F25dd9f2d5f02D01B1C2c1c5F0B14c4B48A3\",\"description\":\"set merkleRoot, sweep the bridge's ETH into the OptimismPortal while claims are paused, and after the recovery timestamp withdraw all tokens and ETH.\",\"role\":\".guardian\"}\n receivedPermissions.3.description:\n- \"Allowed to pause withdrawals. In op stack systems with a proof system, the Guardian can also blacklist dispute games and set the respected game type (permissioned / permissionless).\"\n+ \"set merkleRootETH, pause and unpause claims, and after RECOVERY_TIMESTAMP (while paused) withdraw the whole ETH balance.\"\n receivedPermissions.4.description:\n- \"Allowed to pause withdrawals. In op stack systems with a proof system, the Guardian can also blacklist dispute games and set the respected game type (permissioned / permissionless).\"\n+ \"set merkleRootETH, pause and unpause claims, and after RECOVERY_TIMESTAMP (while paused) withdraw the whole ETH balance.\"\n }\n```\n\n```diff\n contract L1StandardBridge (eth:0xBA61F25dd9f2d5f02D01B1C2c1c5F0B14c4B48A3) [opstack/L1StandardBridge_K2_claim] {\n +++ description: Modified L1StandardBridge: deposits and finalizing withdrawals are disabled. ERC20 tokens held by the contract can only be claimed with a Merkle proof against merkleRoot. After the recovery timestamp and while claims are paused (both read from OPTIMISM_PORTAL), the guardian can withdraw all tokens and ETH.\n template:\n- \"opstack/L1StandardBridge\"\n+ \"opstack/L1StandardBridge_K2_claim\"\n sourceHashes.1:\n- \"0x59c3a5c6d2b22ffe8a2e4bc09e8deb308fa757230ac6f0f854c7bd1244755f8d\"\n+ \"0x32ea980305b615ec390e8c57663c0734c2ebf70465e6076b26eb8262e7400dba\"\n description:\n- \"The main entry point to deposit ERC20 tokens from host chain to this chain.\"\n+ \"Modified L1StandardBridge: deposits and finalizing withdrawals are disabled. ERC20 tokens held by the contract can only be claimed with a Merkle proof against merkleRoot. After the recovery timestamp and while claims are paused (both read from OPTIMISM_PORTAL), the guardian can withdraw all tokens and ETH.\"\n values.$implementation:\n- \"eth:0xC4De51792746960FC0ac78360b8e9c6E103F3B13\"\n+ \"eth:0xF44B55E152e872FF5CbD3d9F3bd732F67d5B366A\"\n values.version:\n- \"1.4.0\"\n+ \"2.3.0\"\n values.guardian:\n+ \"eth:0x28A227d4faF0f4f75897438E24C43EF1CDABb920\"\n+++ description: Root of the Merkle tree of (address, tokens, cumulative amounts) ERC20 claims.\n values.merkleRoot:\n+ \"0x0747603ccf64fdae7c52f9e69c1bafbb8b171860812139d59972cd8d022e3840\"\n values.OPTIMISM_PORTAL:\n+ \"eth:0xeeCE9CD7Abd1CC84d9dfc7493e7e68079E47eA73\"\n implementationNames.eth:0xC4De51792746960FC0ac78360b8e9c6E103F3B13:\n- \"L1StandardBridge\"\n implementationNames.eth:0xF44B55E152e872FF5CbD3d9F3bd732F67d5B366A:\n+ \"L1StandardBridge\"\n fieldMeta:\n+ {\"merkleRoot\":{\"description\":\"Root of the Merkle tree of (address, tokens, cumulative amounts) ERC20 claims.\"}}\n }\n```\n\n```diff\n contract OptimismPortal (eth:0xeeCE9CD7Abd1CC84d9dfc7493e7e68079E47eA73) [opstack/OptimismPortal_K2_claim] {\n +++ description: Modified OptimismPortal: deposits, proving and finalizing withdrawals are disabled. ETH held by the contract can only be claimed with a Merkle proof against merkleRootETH. After RECOVERY_TIMESTAMP and while claims are paused, the guardian can withdraw the whole ETH balance.\n template:\n- \"opstack/OptimismPortal\"\n+ \"opstack/OptimismPortal_K2_claim\"\n sourceHashes.1:\n- \"0x620d0104aa94a7390fc59343e3d3a822959da7dc77b3a42f65586020da2e4faf\"\n+ \"0x094c023344df46deb39df74619a815bc1bfced43ad55bb1f9dbb4e9c8718ba65\"\n description:\n- \"The main entry point to deposit funds from host chain to this chain. It also allows to prove and finalize withdrawals.\"\n+ \"Modified OptimismPortal: deposits, proving and finalizing withdrawals are disabled. ETH held by the contract can only be claimed with a Merkle proof against merkleRootETH. After RECOVERY_TIMESTAMP and while claims are paused, the guardian can withdraw the whole ETH balance.\"\n values.$implementation:\n- \"eth:0x3fe449Ef47228F03f979F9D955196494243cdf7E\"\n+ \"eth:0xB1762246367681e5b335968950e8A17b0c56021D\"\n values.$pastUpgrades.1:\n+ [\"2026-09-15T04:45:35.000Z\",\"0x59515cbe7245d0856751523549d7b4524beb5f31930b2bc7bc3016b8071e65fd\",[\"eth:0xB1762246367681e5b335968950e8A17b0c56021D\"]]\n values.$upgradeCount:\n- 1\n+ 2\n values.version:\n- \"1.10.0\"\n+ \"2.3.0\"\n+++ description: Root of the Merkle tree of (address, cumulative amount) ETH claims.\n values.merkleRootETH:\n+ \"0x6822879a8b8b0acb7a826beaec075d292958ffcb64c980959c0d0aea5ea0f8f9\"\n+++ description: Timestamp after which the guardian can withdraw the whole ETH balance.\n values.RECOVERY_TIMESTAMP:\n+ 1820707200\n implementationNames.eth:0x3fe449Ef47228F03f979F9D955196494243cdf7E:\n- \"OptimismPortal\"\n implementationNames.eth:0xB1762246367681e5b335968950e8A17b0c56021D:\n+ \"OptimismPortal\"\n fieldMeta:\n+ {\"merkleRootETH\":{\"description\":\"Root of the Merkle tree of (address, cumulative amount) ETH claims.\"},\"RECOVERY_TIMESTAMP\":{\"description\":\"Timestamp after which the guardian can withdraw the whole ETH balance.\"}}\n }\n```"
}
]
},
{
"id": "964f5221",
"date": "Thu, 09 Jul 2026 09:58:51 GMT",
"timestamp": 1783591047,
"description": "SystemConfig `opStackDA.isUsingCelestia: false → true`. K2 is posting to Celestia again after the brief switch to Ethereum calldata on 2026-07-01; that switch was transient and has been removed from the config.",
"isHighSeverity": false,
"changeCount": 1,
"sections": [
{
"kind": "watched-changes",
"body": "```diff\n contract SystemConfig (eth:0x622333688CC1878C7ff4205c89bDe051798788A7) [opstack/SystemConfig] {\n +++ description: Contains configuration parameters such as the Sequencer address, gas limit on this chain and the unsafe block signer address.\n values.opStackDA.isUsingCelestia:\n- false\n+ true\n }\n```"
}
]
},
{
"id": "99581012",
"date": "Wed, 01 Jul 2026 16:34:19 GMT",
"timestamp": 1782923571,
"description": "SystemConfig `opStackDA.isUsingCelestia`: `true` → `false`. Karak no longer uses Celestia DA.",
"isHighSeverity": false,
"changeCount": 1,
"sections": [
{
"kind": "watched-changes",
"body": "```diff\n contract SystemConfig (eth:0x622333688CC1878C7ff4205c89bDe051798788A7) [opstack/SystemConfig] {\n +++ description: Contains configuration parameters such as the Sequencer address, gas limit on this chain and the unsafe block signer address.\n values.opStackDA.isUsingCelestia:\n- true\n+ false\n }\n```"
}
]
},
{
"id": "ff5c2ec5",
"date": "Fri, 12 Dec 2025 10:26:42 GMT",
"timestamp": 1765535115,
"description": "K2 is posting to Celestia.",
"isHighSeverity": false,
"changeCount": 1,
"sections": [
{
"kind": "watched-changes",
"body": "```diff\n contract SystemConfig (eth:0x622333688CC1878C7ff4205c89bDe051798788A7) {\n +++ description: Contains configuration parameters such as the Sequencer address, gas limit on this chain and the unsafe block signer address.\n values.opStackDA.isUsingCelestia:\n- false\n+ true\n }\n```"
}
]
},
{
"id": "4c1da421",
"date": "Fri, 28 Nov 2025 12:52:00 GMT",
"timestamp": 1764334235,
"description": "Posts calldata instead of Celestia blobs.",
"isHighSeverity": false,
"changeCount": 1,
"sections": [
{
"kind": "watched-changes",
"body": "```diff\n contract SystemConfig (eth:0x622333688CC1878C7ff4205c89bDe051798788A7) {\n +++ description: Contains configuration parameters such as the Sequencer address, gas limit on this chain and the unsafe block signer address.\n values.opStackDA.isUsingCelestia:\n- true\n+ false\n }\n```"
}
]
},
{
"id": "090316b6",
"date": "Mon, 14 Jul 2025 12:45:13 GMT",
"timestamp": 1752497113,
"description": "Discovery rerun on the same block number with only config-related changes.",
"isHighSeverity": false,
"changeCount": 10,
"sections": [
{
"kind": "config-related-changes",
"body": "```diff\n+ Status: CREATED\n contract L2OutputOracle (0x0a23342520Aa8Ca963c4201801F4D3E95e731637)\n +++ description: Contains a list of proposed state roots which Proposers assert to be a result of block execution. Currently only the PROPOSER address can submit new state roots.\n```\n\n```diff\n+ Status: CREATED\n contract ProxyAdmin (0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C)\n +++ description: None\n```\n\n```diff\n+ Status: CREATED\n contract KarakMultisig (0x28A227d4faF0f4f75897438E24C43EF1CDABb920)\n +++ description: None\n```\n\n```diff\n+ Status: CREATED\n contract SystemConfig (0x622333688CC1878C7ff4205c89bDe051798788A7)\n +++ description: Contains configuration parameters such as the Sequencer address, gas limit on this chain and the unsafe block signer address.\n```\n\n```diff\n+ Status: CREATED\n contract L1ERC721Bridge (0x952851CecB07705A5bb483C1CE080F97e1E7491E)\n +++ description: Used to bridge ERC-721 tokens from host chain to this chain.\n```\n\n```diff\n+ Status: CREATED\n contract L1CrossDomainMessenger (0x9BFfA66a8FcAAd7AC9ea7c7d4b9a6fc46777022d)\n +++ description: Sends messages from host chain to this chain, and relays messages back onto host chain. In the event that a message sent from host chain to this chain is rejected for exceeding this chain's epoch gas limit, it can be resubmitted via this contract's replay function.\n```\n\n```diff\n+ Status: CREATED\n contract L1StandardBridge (0xBA61F25dd9f2d5f02D01B1C2c1c5F0B14c4B48A3)\n +++ description: The main entry point to deposit ERC20 tokens from host chain to this chain.\n```\n\n```diff\n+ Status: CREATED\n contract OptimismPortal (0xeeCE9CD7Abd1CC84d9dfc7493e7e68079E47eA73)\n +++ description: The main entry point to deposit funds from host chain to this chain. It also allows to prove and finalize withdrawals.\n```\n\n```diff\n+ Status: CREATED\n contract OptimismMintableERC20Factory (0xF04a74899FF4c4410fAF3B5faa29B8Fd199C13DB)\n +++ description: A helper contract that generates OptimismMintableERC20 contracts on the network it's deployed to. OptimismMintableERC20 is a standard extension of the base ERC20 token contract designed to allow the L1StandardBridge contracts to mint and burn tokens. This makes it possible to use an OptimismMintableERC20 as this chain's representation of a token on the host chain, or vice-versa.\n```\n\n```diff\n+ Status: CREATED\n contract AddressManager (0xF2C89960B6D63eC6c61dF3EA8BaFa0a02c26e8C9)\n +++ description: Legacy contract used to manage a mapping of string names to addresses. Modern OP stack uses a different standard proxy system instead, but this contract is still necessary for backwards compatibility with several older contracts.\n```"
}
]
},
{
"id": "0e0797de",
"date": "Wed, 28 Feb 2024 08:50:37 GMT",
"timestamp": 1709110237,
"description": "Update discovery to include the multisig threshold.",
"isHighSeverity": false,
"changeCount": 10,
"sections": [
{
"kind": "initial-discovery",
"body": "```diff\n+ Status: CREATED\n contract L2OutputOracle (0x0a23342520Aa8Ca963c4201801F4D3E95e731637) {\n }\n```\n\n```diff\n+ Status: CREATED\n contract ProxyAdmin (0x1612F868EbA1cea65ee66bF4A7C75001b0D4065C) {\n }\n```\n\n```diff\n+ Status: CREATED\n contract KarakMultisig (0x28A227d4faF0f4f75897438E24C43EF1CDABb920) {\n }\n```\n\n```diff\n+ Status: CREATED\n contract SystemConfig (0x622333688CC1878C7ff4205c89bDe051798788A7) {\n }\n```\n\n```diff\n+ Status: CREATED\n contract L1ERC721Bridge (0x952851CecB07705A5bb483C1CE080F97e1E7491E) {\n }\n```\n\n```diff\n+ Status: CREATED\n contract L1CrossDomainMessenger (0x9BFfA66a8FcAAd7AC9ea7c7d4b9a6fc46777022d) {\n }\n```\n\n```diff\n+ Status: CREATED\n contract L1StandardBridge (0xBA61F25dd9f2d5f02D01B1C2c1c5F0B14c4B48A3) {\n }\n```\n\n```diff\n+ Status: CREATED\n contract OptimismPortal (0xeeCE9CD7Abd1CC84d9dfc7493e7e68079E47eA73) {\n }\n```\n\n```diff\n+ Status: CREATED\n contract OptimismMintableERC20Factory (0xF04a74899FF4c4410fAF3B5faa29B8Fd199C13DB) {\n }\n```\n\n```diff\n+ Status: CREATED\n contract AddressManager (0xF2C89960B6D63eC6c61dF3EA8BaFa0a02c26e8C9) {\n }\n```"
}
]
}
]