Add predeploys

packages/contracts-bedrock/contracts/libraries/Predeploys.sol

@@ -71,4 +71,10 @@ library Predeploys {
 
     /// @notice Address of the GovernanceToken predeploy.
     address internal constant GOVERNANCE_TOKEN = 0x4200000000000000000000000000000000000042;
+
+    /// @notice Address of the SchemaRegistry predeploy.
+    address internal constant SCHEMA_REGISTRY = 0x4200000000000000000000000000000000000020;
+
+    /// @notice Address of the EAS predeploy.
+    address internal constant EAS = 0x4200000000000000000000000000000000000021;
 }

specs/predeploys.md

@@ -311,3 +311,20 @@ Address: `0x420000000000000000000000000000000000001a`
 The `L1FeeVault` predeploy receives the L1 portion of the transaction fees.
 Once the contract has received a certain amount of fees, the ETH can be
 withdrawn to an immutable address on L1.
+
+## SchemaRegistry
+
+[Implementation](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/contracts/EAS/SchemaRegistry.sol)
+
+Address: `0x4200000000000000000000000000000000000020`
+
+The `SchemaRegistry` predeploy implements the global attestation schemas for the `Ethereum Attestation Service`
+protocol.
+
+## EAS
+
+[Implementation](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/contracts/EAS/EAS.sol)
+
+Address: `0x4200000000000000000000000000000000000021`
+
+The `EAS` predeploy implements the `Ethereum Attestation Service` protocol.