feat(protocol): allow whitelisting proposers

.gitignore

@@ -109,4 +109,8 @@ dist
 # vscode
 .vscode/
 
-.pdf
+# python
+__pycache__/
+
+# whitepaper
+.pdf

packages/protocol/.solhintignore

@@ -3,4 +3,6 @@ contracts/aux/tokens/ERC20Upgradeable.sol
 contracts/test/TestLibRLPReader.sol
 contracts/test/TestLibRLPWriter.sol
 contracts/libs/Lib1559Math.sol
+contracts/libs/LibAddress.sol
+contracts/libs/LibMath.sol
 **/contracts/thirdparty/**/*.sol

packages/protocol/contracts/L1/LibData.sol

@@ -26,17 +26,21 @@ library LibData {
         uint64 commitSlot;
     }
 
+    // 3 slots
     struct ProposedBlock {
         bytes32 metaHash;
+        address proposer;
+        uint64 proposedAt;
     }
 
+    // 3 + n slots
     struct ForkChoice {
         bytes32 blockHash;
-        uint64 proposedAt;
         uint64 provenAt;
         address[] provers;
     }
 
+    // This struct takes 9 slots.
     struct State {
         // block id => block hash
         mapping(uint256 => bytes32) l2Hashes;
@@ -46,39 +50,59 @@ library LibData {
         mapping(uint256 => mapping(bytes32 => ForkChoice)) forkChoices;
         // proposer => commitSlot => hash(commitHash, commitHeight)
         mapping(address => mapping(uint256 => bytes32)) commits;
-        mapping(address => bool) provers; // Whitelisted provers
-        uint64 statusBits;
+        // Never or rarely changed
         uint64 genesisHeight;
+        uint64 genesisTimestamp;
+        uint64 __reservedA1;
+        uint64 statusBits; // rarely change
+        // Changed when a block is proposed
+        uint64 nextBlockId;
+        uint64 lastProposedAt; // Timestamp when the last block is proposed.
+        uint64 avgBlockTime; // The block time moving average
+        uint64 __avgGasLimit; // the block gaslimit moving average, not updated.
+        // Changed when a block is proven/finalized
         uint64 latestVerifiedHeight;
         uint64 latestVerifiedId;
-        uint64 nextBlockId;
+        uint64 avgProofTime; // the proof time moving average
+        uint64 __reservedC1;
+        // Reserved
+        uint256[42] __gap;
+    }
+
+    struct TentativeState {
+        mapping(address => bool) proposers; // Whitelisted proposers
+        mapping(address => bool) provers; // Whitelisted provers
+        bool whitelistProposers;
+        bool whitelistProvers;
+        // // Reserved
+        uint256[46] __gap;
     }
 
     function saveProposedBlock(
-        LibData.State storage s,
+        LibData.State storage state,
         uint256 id,
         ProposedBlock memory blk
     ) internal {
-        s.proposedBlocks[id % LibConstants.TAIKO_MAX_PROPOSED_BLOCKS] = blk;
+        state.proposedBlocks[id % LibConstants.K_MAX_NUM_BLOCKS] = blk;
     }
 
     function getProposedBlock(
-        State storage s,
+        State storage state,
         uint256 id
     ) internal view returns (ProposedBlock storage) {
-        return s.proposedBlocks[id % LibConstants.TAIKO_MAX_PROPOSED_BLOCKS];
+        return state.proposedBlocks[id % LibConstants.K_MAX_NUM_BLOCKS];
     }
 
     function getL2BlockHash(
-        State storage s,
+        State storage state,
         uint256 number
     ) internal view returns (bytes32) {
-        require(number <= s.latestVerifiedHeight, "L1:id");
-        return s.l2Hashes[number];
+        require(number <= state.latestVerifiedHeight, "L1:id");
+        return state.l2Hashes[number];
     }
 
     function getStateVariables(
-        State storage s
+        State storage state
     )
         internal
         view
@@ -89,10 +113,10 @@ library LibData {
             uint64 nextBlockId
         )
     {
-        genesisHeight = s.genesisHeight;
-        latestVerifiedHeight = s.latestVerifiedHeight;
-        latestVerifiedId = s.latestVerifiedId;
-        nextBlockId = s.nextBlockId;
+        genesisHeight = state.genesisHeight;
+        latestVerifiedHeight = state.latestVerifiedHeight;
+        latestVerifiedId = state.latestVerifiedId;
+        nextBlockId = state.nextBlockId;
     }
 
     function hashMetadata(