feat: remove next sequencer hash (#7)

Author: eigmax

script/README.md

@@ -8,6 +8,6 @@ export OWNER=0x8943545177806ED17B9F23F0a21ee5948eCaa776
 forge script script/SSPDeploy.s.sol:Deploy \
     --rpc-url https://rpc.testnet3.goat.network --private-key=$prv --broadcast --legacy
 
-forge verify-contract --compiler-version 0.8.28 0xEE0fCB8E5cCAD0b4197BAabd633333886f5C364d SequencerSetPublisher --verifier blockscout --verifier-url 'https://explorer.testnet3.goat.network/api/'
+forge verify-contract --compiler-version 0.8.28 0x3901C4670aA92a626636f7Ea1e3F029A0ECd6b68 SequencerSetPublisher --verifier blockscout --verifier-url 'https://explorer.testnet3.goat.network/api/'
 
 ```

src/SequencerSetPublisher.sol

@@ -57,7 +57,6 @@ contract SequencerSetPublisher is Initializable, OwnableUpgradeable, ISequencerS
         bytes32 cmt = keccak256(
             abi.encodePacked(
                 ss.sequencerSetHash,
-                ss.nextSequencerSetHash,
                 ss.publishersHash,
                 ss.nextPublishersHash,
                 ss.p2wshSigHash,
@@ -97,8 +96,6 @@ contract SequencerSetPublisher is Initializable, OwnableUpgradeable, ISequencerS
             bytes32 prevCmt = calcMajoritySequencerSetCmtAtHeightOrLatest(latestConfirmedHeight);
             SequencerSet storage prevSs = cmtSequencerSet[prevCmt];
             require(prevSs.nextPublishersHash == ss.publishersHash, InvalidPublisherSet());
-            // TODO: we should check this when update sequencer set.
-            //require(prevSs.nextSequencerSetHash == ss.sequencerSetHash, InvalidSequencerSet());
         }
 
         // ensure valid sigs >= 2/3

src/interfaces/ISequencerSetPublisher.sol

@@ -4,7 +4,6 @@ pragma solidity ^0.8.28;
 interface ISequencerSetPublisher {
     struct SequencerSet {
         bytes32 sequencerSetHash; // validator_hash
-        bytes32 nextSequencerSetHash; // next_validator_hash
         bytes32 publishersHash;
         bytes32 nextPublishersHash;
         bytes32 p2wshSigHash; // anchor the BTC txn

test/SequencerSetPublisher.t.sol

@@ -158,7 +158,6 @@ contract SequencerSetPublisherTest is Test {
 
         ISequencerSetPublisher.SequencerSet memory ss = ISequencerSetPublisher.SequencerSet({
             sequencerSetHash: sequencerSetHash,
-            nextSequencerSetHash: nextSequencerSetHash,
             publishersHash: keccak256(abi.encodePacked(publishers)),
             nextPublishersHash: keccak256(abi.encodePacked(nextPublishers)),
             p2wshSigHash: p2wshSigHash.toEthSignedMessageHash(),