diff --git a/src/interfaces/multichain/IBN254CertificateVerifier.sol b/src/interfaces/multichain/IBN254CertificateVerifier.sol
new file mode 100644
index 00000000..185f0b9b
--- /dev/null
+++ b/src/interfaces/multichain/IBN254CertificateVerifier.sol
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.27;
+
+import {BN254} from "../../libraries/BN254.sol";
+import {OperatorSet} from "eigenlayer-contracts/src/contracts/libraries/OperatorSetLib.sol";
+import {IBN254TableCalculatorTypes} from "./IBN254TableCalculator.sol";
+import {ICertificateVerifier} from "./ICertificateVerifier.sol";
+
+interface IBN254CertificateVerifierTypes is IBN254TableCalculatorTypes {
+    /**
+     * @notice A witness for an operator
+     * @param operatorIndex the index of the nonsigner in the `BN254OperatorInfo` tree
+     * @param operatorInfoProofs merkle proofs of the nonsigner at the index. Empty if operator is in cache.
+     * @param operatorInfo the `BN254OperatorInfo` for the operator
+     */
+    struct BN254OperatorInfoWitness {
+        uint32 operatorIndex;
+        bytes operatorInfoProof;
+        BN254OperatorInfo operatorInfo;
+    }
+
+    /**
+     * @notice A BN254 Certificate
+     * @param referenceTimestamp the timestamp at which the certificate was created
+     * @param messageHash the hash of the message that was signed by operators and used to verify the aggregated signature
+     * @param signature the G1 signature of the message
+     * @param apk the G2 aggregate public key
+     * @param nonSignerWitnesses an array of witnesses of non-signing operators
+     */
+    struct BN254Certificate {
+        uint32 referenceTimestamp;
+        bytes32 messageHash;
+        BN254.G1Point signature;
+        BN254.G2Point apk;
+        BN254OperatorInfoWitness[] nonSignerWitnesses;
+    }
+}
+
+interface IBN254CertificateVerifierEvents is IBN254CertificateVerifierTypes {
+    /// @notice Emitted when a table is updated
+    event TableUpdated(uint32 referenceTimestamp, BN254OperatorSetInfo operatorSetInfo);
+}
+
+/// @notice A base table manager interface that handles operator table updates
+/// @dev We separate out this interface for forwards-compatibility with a future `TableManager` contract that stores all operatorSet's tables on a chain
+interface IBN254TableManager is IBN254CertificateVerifierTypes {
+    /**
+     * @notice updates the operator table
+     * @param operatorSet the operatorSet to update the operator table for
+     * @param referenceTimestamp the timestamp at which the operatorSetInfo and
+     * operatorInfoTreeRoot were sourced
+     * @param operatorSetInfo the aggregate information about the operatorSet
+     * @dev only callable by the operatorTableUpdater
+     * @dev We pass in an `operatorSet` for future-proofing a global `TableManager` contract
+     */
+    function updateOperatorTable(
+        OperatorSet calldata operatorSet,
+        uint32 referenceTimestamp,
+        BN254OperatorSetInfo memory operatorSetInfo
+    ) external;
+
+    /**
+     * @notice ejects operators from the operatorSet
+     * @param referenceTimestamp the timestamp of the operator tbale against which
+     * the ejection is being done
+     * @param operatorIndices the indices of the operators to eject
+     * @param witnesses for the operators that are not already in storage
+     * @dev only callable by the ejector
+     * @dev We pass in an `operatorSet` for future-proofing a global `TableManager` contract
+     */
+    function ejectOperators(
+        OperatorSet calldata operatorSet,
+        uint32 referenceTimestamp,
+        uint32[] calldata operatorIndices,
+        BN254OperatorInfoWitness[] calldata witnesses
+    ) external;
+}
+
+interface IBN254CertificateVerifier is
+    ICertificateVerifier,
+    IBN254TableManager,
+    IBN254CertificateVerifierEvents
+{
+    /**
+     * @notice verifies a certificate
+     * @param cert a certificate
+     * @return signedStakes amount of stake that signed the certificate for each stake
+     * type
+     */
+    function verifyCertificate(
+        BN254Certificate memory cert
+    ) external returns (uint96[] memory signedStakes);
+
+    /**
+     * @notice verifies a certificate and makes sure that the signed stakes meet
+     * provided portions of the total stake on the AVS
+     * @param cert a certificate
+     * @param totalStakeProportionThresholds the proportion of total stake that
+     * the signed stake of the certificate should meet
+     * @return whether or not certificate is valid and meets thresholds
+     */
+    function verifyCertificateProportion(
+        BN254Certificate memory cert,
+        uint16[] memory totalStakeProportionThresholds
+    ) external returns (bool);
+
+    /**
+     * @notice verifies a certificate and makes sure that the signed stakes meet
+     * provided nominal stake thresholds
+     * @param cert a certificate
+     * @param totalStakeNominalThresholds the nominal amount of stake that
+     * the signed stake of the certificate should meet
+     * @return whether or not certificate is valid and meets thresholds
+     */
+    function verifyCertificateNominal(
+        BN254Certificate memory cert,
+        uint96[] memory totalStakeNominalThresholds
+    ) external returns (bool);
+}
diff --git a/src/interfaces/multichain/IBN254TableCalculator.sol b/src/interfaces/multichain/IBN254TableCalculator.sol
new file mode 100644
index 00000000..af0ef22d
--- /dev/null
+++ b/src/interfaces/multichain/IBN254TableCalculator.sol
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.27;
+
+import {BN254} from "../../libraries/BN254.sol";
+import {OperatorSet} from "eigenlayer-contracts/src/contracts/libraries/OperatorSetLib.sol";
+import {IOperatorTableCalculator} from "./IOperatorTableCalculator.sol";
+
+interface IBN254TableCalculatorTypes {
+    /**
+     * @notice A struct that contains information about a single operator
+     * @param pubkey The G1 public key of the operator.
+     * @param weights The weights of the operator for a single operatorSet.
+     * @dev The `weights` array can be defined as a list of arbitrary groupings. For example,
+     * it can be [slashable_stake, delegated_stake, strategy_i_stake, ...]
+     */
+    struct BN254OperatorInfo {
+        BN254.G1Point pubkey;
+        uint96[] weights;
+    }
+
+    /**
+     * @notice A struct that contains information about all operators for a given operatorSet
+     * @param operatorInfoTreeRoot The root of the operatorInfo tree.
+     * @param numOperators The number of operators in the operatorSet.
+     * @param aggregatePubkey The aggregate G1 public key of the operators in the operatorSet.
+     * @param totalWeights The total weights of the operators in the operatorSet.
+     *
+     * @dev The operatorInfoTreeRoot is the root of a merkle tree that contains the operatorInfos for each operator in the operatorSet.
+     * It is calculated in this function and used by the `IBN254CertificateVerifier` to verify stakes against the non-signing operators
+     *
+     * @dev Retrieval of the `aggregatePubKey` depends on maintaining a key registry contract, see `BLSAPKRegistry` for an example implementation.
+     *
+     * @dev The `totalWeights` array should be the same length as each individual `weights` array in `operatorInfos`.
+     */
+    struct BN254OperatorSetInfo {
+        bytes32 operatorInfoTreeRoot;
+        uint256 numOperators;
+        BN254.G1Point aggregatePubkey;
+        uint96[] totalWeights;
+    }
+}
+
+interface IBN254TableCalculator is IOperatorTableCalculator, IBN254TableCalculatorTypes {
+    /**
+     * @notice calculates the operatorInfos for a given operatorSet
+     * @param operatorSet the operatorSet to calculate the operator table for
+     * @return operatorSetInfo the operatorSetInfo for the given operatorSet
+     * @dev The output of this function is converted to bytes via the `calculateOperatorTableBytes` function
+     */
+    function calculateOperatorTable(
+        OperatorSet calldata operatorSet
+    ) external view returns (BN254OperatorSetInfo memory operatorSetInfo);
+
+    /**
+     * @notice Get the operatorInfos for a given operatorSet
+     * @param operatorSet the operatorSet to get the operatorInfos for
+     * @return operatorInfos the operatorInfos for the given operatorSet
+     */
+    function getOperatorInfos(
+        OperatorSet calldata operatorSet
+    ) external view returns (BN254OperatorInfo[] memory operatorInfos);
+}
diff --git a/src/interfaces/multichain/ICertificateVerifier.sol b/src/interfaces/multichain/ICertificateVerifier.sol
new file mode 100644
index 00000000..37ae5f29
--- /dev/null
+++ b/src/interfaces/multichain/ICertificateVerifier.sol
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.27;
+
+import {OperatorSet} from "eigenlayer-contracts/src/contracts/libraries/OperatorSetLib.sol";
+
+interface ICertificateVerifierErrors {
+    /// @notice Thrown when the table updater is not caller
+    error OnlyTableUpdater();
+    /// @notice Thrown when the table is too stale
+    error TableStale();
+    /// @notice Thrown when certificate verification fails
+    error CertVerificationFailed();
+}
+
+/// @notice A base interface that verifies certificates for a given operatorSet
+/// @notice This is a base interface that all curve certificate verifiers (eg. BN254, ECDSA) must implement
+/// @dev A single `CertificateVerifier` can be used for ONLY 1 operatorSet
+interface ICertificateVerifier is ICertificateVerifierErrors {
+    /**
+     * @notice sets the operator table updater
+     * @param operatorTableUpdater the address of the operator table updater
+     * @dev only callable by the owner
+     */
+    function setOperatorTableUpdater(
+        address operatorTableUpdater
+    ) external;
+
+    /**
+     * @notice Sets the ejector
+     * @param ejector the address of the ejector
+     * @dev only callable by the owner
+     */
+    function setEjector(
+        address ejector
+    ) external;
+
+    /**
+     * @notice sets the max operator table staleness
+     * @param maxOperatorTableStaleness the max operator table staleness
+     * @dev only callable by the owner
+     */
+    function setMaxOperatorTableStaleness(
+        uint32 maxOperatorTableStaleness
+    ) external;
+
+    /// @notice the operatorSet the CertificateVerifier is for
+    function operatorSet() external returns (OperatorSet memory);
+
+    /// @notice the address of the entity that can update the operator table
+    function operatorTableUpdater() external returns (address);
+
+    /// @notice the address of the entity that can eject operators
+    function ejector() external returns (address);
+
+    /// @return the maximum amount of seconds that a operator table can be in the past
+    function maxOperatorTableStaleness() external returns (uint32);
+
+    /// @notice The latest reference timestamp of the operator table
+    function latestReferenceTimestamp() external returns (uint32);
+}
diff --git a/src/interfaces/multichain/IECDSACertificateVerifier.sol b/src/interfaces/multichain/IECDSACertificateVerifier.sol
new file mode 100644
index 00000000..01dd370e
--- /dev/null
+++ b/src/interfaces/multichain/IECDSACertificateVerifier.sol
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.27;
+
+import {OperatorSet} from "eigenlayer-contracts/src/contracts/libraries/OperatorSetLib.sol";
+import {ICertificateVerifier} from "./ICertificateVerifier.sol";
+import {IECDSATableCalculatorTypes} from "./IECDSATableCalculator.sol";
+
+interface IECDSCertificateVerifierTypes is IECDSATableCalculatorTypes {
+    /**
+     * @notice A ECDSA Certificate
+     * @param referenceTimestamp the timestamp at which the certificate was created
+     * @param messageHash the hash of the message that was signed by operators
+     * @param signature the concatenated signature of each signing operator
+     */
+    struct ECDSACertificate {
+        uint32 referenceTimestamp;
+        bytes32 messageHash;
+        bytes sig;
+    }
+}
+
+interface IECDSACertificateVerifierEvents is IECDSCertificateVerifierTypes {
+    /// @notice Emitted when a table is updated
+    event TableUpdated(uint32 referenceTimestamp, ECDSAOperatorInfo[] operatorInfos);
+}
+
+/// @notice A base table manager interface that handles operator table updates
+/// @dev We separate out this interface for forwards-compatibility with a future `TableManager` contract that stores all operatorSet's tables on a chain
+interface IECDSATableManager is IECDSCertificateVerifierTypes {
+    /**
+     * @notice updates the operator table
+     * @param operatorSet the operatorSet to update the operator table for
+     * @param referenceTimestamp the timestamp at which the operatorInfos were sourced
+     * @param operatorInfos the operatorInfos to update the operator table with
+     * @dev only callable by the operatorTableUpdater
+     * @dev We pass in an `operatorSet` for future-proofing a global `TableManager` contract
+     */
+    function updateOperatorTable(
+        OperatorSet calldata operatorSet,
+        uint32 referenceTimestamp,
+        ECDSAOperatorInfo[] calldata operatorInfos
+    ) external;
+
+    /**
+     * @notice ejects operators from the operatorSet
+     * @param operatorSet the operatorSet to eject operators from
+     * @param referenceTimestamp the timestamp of the operator table against which
+     * the ejection is being done
+     * @param operatorIndices the indices of the operators to eject
+     * @dev only callable by the ejector
+     * @dev We pass in an `operatorSet` for future-proofing a global `TableManager` contract
+     */
+    function ejectOperators(
+        OperatorSet calldata operatorSet,
+        uint32 referenceTimestamp,
+        uint32[] calldata operatorIndices
+    ) external;
+}
+
+interface IECDSACertificateVerifier is
+    ICertificateVerifier,
+    IECDSATableManager,
+    IECDSACertificateVerifierEvents
+{
+    /**
+     * @notice verifies a certificate
+     * @param cert a certificate
+     * @return signedStakes amount of stake that signed the certificate for each stake
+     * type
+     */
+    function verifyCertificate(
+        ECDSACertificate memory cert
+    ) external returns (uint96[] memory signedStakes);
+
+    /**
+     * @notice verifies a certificate and makes sure that the signed stakes meet
+     * provided portions of the total stake on the AVS
+     * @param cert a certificate
+     * @param totalStakeProportionThresholds the proportion of total stake that
+     * the signed stake of the certificate should meet
+     * @return whether or not certificate is valid and meets thresholds
+     */
+    function verifyCertificateProportion(
+        ECDSACertificate memory cert,
+        uint16[] memory totalStakeProportionThresholds
+    ) external returns (bool);
+
+    /**
+     * @notice verifies a certificate and makes sure that the signed stakes meet
+     * provided portions of the total stake on the AVS
+     * @param cert a certificate
+     * @param totalStakeNominalThresholds the proportion of total stake that
+     * the signed stake of the certificate should meet
+     * @return whether or not certificate is valid and meets thresholds
+     */
+    function verifyCertificateNominal(
+        ECDSACertificate memory cert,
+        uint96[] memory totalStakeNominalThresholds
+    ) external returns (bool);
+}
diff --git a/src/interfaces/multichain/IECDSATableCalculator.sol b/src/interfaces/multichain/IECDSATableCalculator.sol
new file mode 100644
index 00000000..929b73c6
--- /dev/null
+++ b/src/interfaces/multichain/IECDSATableCalculator.sol
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.27;
+
+import {OperatorSet} from "eigenlayer-contracts/src/contracts/libraries/OperatorSetLib.sol";
+import {IOperatorTableCalculator} from "./IOperatorTableCalculator.sol";
+
+interface IECDSATableCalculatorTypes {
+    /**
+     * @notice A struct that contains information about a single operator
+     * @param pubkey The address of the operator
+     * @param weights The weights of the operator for a single operatorSet
+     * @dev The `weights` array can be defined as a list of arbitrary groupings. For example,
+     * it can be [slashable_stake, delegated_stake, strategy_i_stake, ...]
+     */
+    struct ECDSAOperatorInfo {
+        address pubkey;
+        uint96[] weights;
+    }
+}
+
+interface IECDSATableCalculator is IOperatorTableCalculator, IECDSATableCalculatorTypes {
+    /**
+     * @notice calculates the operatorInfos for a given operatorSet
+     * @param operatorSet the operatorSet to calculate the operator table for
+     * @return operatorInfos the list of operatorInfos for the given operatorSet
+     * @dev The output of this function is converted to bytes via the `calculateOperatorTableBytes` function
+     */
+    function calculateOperatorTable(
+        OperatorSet calldata operatorSet
+    ) external view returns (ECDSAOperatorInfo[] memory operatorInfos);
+}
diff --git a/src/interfaces/multichain/IOperatorTableCalculator.sol b/src/interfaces/multichain/IOperatorTableCalculator.sol
new file mode 100644
index 00000000..1fbf1ed4
--- /dev/null
+++ b/src/interfaces/multichain/IOperatorTableCalculator.sol
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.20;
+
+import {OperatorSet} from "eigenlayer-contracts/src/contracts/libraries/OperatorSetLib.sol";
+import {IOperatorWeightCalculator} from "./IOperatorWeightCalculator.sol";
+
+/// @notice A base interface that calculates an operator table for a given operatorSet and returns its bytes representation
+/// @notice This is a base interface that all curve table calculators (eg. BN254, ECDSA) must implement
+/// @dev A single `OperatorTableCalculator` can be used for multiple operatorSets of an AVS
+interface IOperatorTableCalculator {
+    /// @notice Thrown when the operatorSet does not exist.
+    error InvalidOperatorSet();
+
+    /**
+     * @notice Sets the operatorWeightCalculator for a given operatorSet
+     * @param operatorSet The operatorSet to set the operatorWeightCalculator for
+     * @param operatorWeightCalculator The operatorWeightCalculator to set for the given operatorSet
+     * @dev This function is only callable by the owner of the contract
+     */
+    function setOperatorWeightCalculator(
+        OperatorSet calldata operatorSet,
+        IOperatorWeightCalculator operatorWeightCalculator
+    ) external;
+
+    /**
+     * @notice calculates the operatorTableBytes for a given operatorSet
+     * @param operatorSet the operatorSet to calculate the operatorTableBytes for
+     * @return operatorTableBytes The operatorTable bytes
+     */
+    function calculateOperatorTableBytes(
+        OperatorSet calldata operatorSet
+    ) external view returns (bytes memory operatorTableBytes);
+
+    /**
+     * @notice For a given operatorSet, returns the operatorWeightCalculator
+     * @param operatorSet The operatorSet to get the operatorWeightCalculator for
+     * @return operatorWeightCalculator The operatorWeightCalculator for the given operatorSet
+     * @dev This contract
+     */
+    function getOperatorWeightCalculator(
+        OperatorSet calldata operatorSet
+    ) external view returns (IOperatorWeightCalculator);
+}
diff --git a/src/interfaces/multichain/IOperatorWeightCalculator.sol b/src/interfaces/multichain/IOperatorWeightCalculator.sol
new file mode 100644
index 00000000..020c9d9a
--- /dev/null
+++ b/src/interfaces/multichain/IOperatorWeightCalculator.sol
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.27;
+
+import {OperatorSet} from "eigenlayer-contracts/src/contracts/interfaces/IAllocationManager.sol";
+
+/// @notice A contract that calculates the weights for all operators in a given operatorSet
+/// @notice This is a base interface to send operator weights to the `IOperatorTableCalculator`
+/// @notice We separate this out to be able to plug-in different operator weight calculators for each operatorSet
+interface IOperatorWeightCalculator {
+    /**
+     * @notice Get the weights for all operators in a given operatorSet
+     * @param operatorSet The operatorSet to get the weights for
+     * @return operators The addresses of the operators in the operatorSet
+     * @return weights The weights for each operator in the operatorSet
+     */
+    function getOperatorWeights(
+        OperatorSet calldata operatorSet
+    ) external view returns (address[] memory operators, uint96[][] memory weights);
+}