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Commit 9d68af5b authored by clabby's avatar clabby
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Move to `H(traceIndex,state)` for stf 

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parent 1625a289
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Showing with 82 additions and 80 deletions
packages/contracts-bedrock/.gas-snapshot
View file @ 9d68af5b
......@@ -32,12 +32,12 @@ DisputeGameFactory_SetImplementation_Test:test_setImplementation_notOwner_revert
DisputeGameFactory_SetImplementation_Test:test_setImplementation_succeeds() (gas: 44243)
DisputeGameFactory_TransferOwnership_Test:test_transferOwnership_notOwner_reverts() (gas: 15950)
DisputeGameFactory_TransferOwnership_Test:test_transferOwnership_succeeds() (gas: 18642)
FaultDisputeGame_ResolvesCorrectly_CorrectRoot2:test_resolvesCorrectly_succeeds() (gas: 510380)
FaultDisputeGame_ResolvesCorrectly_CorrectRoot3:test_resolvesCorrectly_succeeds() (gas: 512246)
FaultDisputeGame_ResolvesCorrectly_CorrectRoot:test_resolvesCorrectly_succeeds() (gas: 500144)
FaultDisputeGame_ResolvesCorrectly_IncorrectRoot2:test_resolvesCorrectly_succeeds() (gas: 507255)
FaultDisputeGame_ResolvesCorrectly_IncorrectRoot3:test_resolvesCorrectly_succeeds() (gas: 509121)
FaultDisputeGame_ResolvesCorrectly_IncorrectRoot:test_resolvesCorrectly_succeeds() (gas: 497019)
FaultDisputeGame_ResolvesCorrectly_CorrectRoot2:test_resolvesCorrectly_succeeds() (gas: 502842)
FaultDisputeGame_ResolvesCorrectly_CorrectRoot3:test_resolvesCorrectly_succeeds() (gas: 504699)
FaultDisputeGame_ResolvesCorrectly_CorrectRoot:test_resolvesCorrectly_succeeds() (gas: 492706)
FaultDisputeGame_ResolvesCorrectly_IncorrectRoot2:test_resolvesCorrectly_succeeds() (gas: 501717)
FaultDisputeGame_ResolvesCorrectly_IncorrectRoot3:test_resolvesCorrectly_succeeds() (gas: 503574)
FaultDisputeGame_ResolvesCorrectly_IncorrectRoot:test_resolvesCorrectly_succeeds() (gas: 491581)
FaultDisputeGame_Test:test_defendRoot_invalidMove_reverts() (gas: 13250)
FaultDisputeGame_Test:test_extraData_succeeds() (gas: 17409)
FaultDisputeGame_Test:test_gameData_succeeds() (gas: 17834)
......
packages/contracts-bedrock/contracts/dispute/interfaces/IBigStepper.sol
View file @ 9d68af5b
......@@ -4,24 +4,24 @@ pragma solidity ^0.8.15;
/// @title IBigStepper
/// @notice An interface for a contract with a state transition function that
/// will accept a pre state and return a post state.
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣼⠶⢅⠒⢄⢔⣶⡦⣤⡤⠄⣀⠀⠀⠀⠀⠀⠀⠀
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠨⡏⠀⠀⠈⠢⣙⢯⣄⠀⢨⠯⡺⡘⢄⠀⠀⠀⠀⠀
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣶⡆⠀⠀⠀⠀⠈⠓⠬⡒⠡⣀⢙⡜⡀⠓⠄⠀⠀⠀
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⡷⠿⣧⣀⡀⠀⠀⠀⠀⠀⠀⠉⠣⣞⠩⠥⠀⠼⢄⠀⠀
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⡇⠀⠀⠀⠉⢹⣶⠒⠒⠂⠈⠉⠁⠘⡆⠀⣿⣿⠫⡄⠀
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⢶⣤⣀⡀⠀⠀⢸⡿⠀⠀⠀⠀⠀⢀⠞⠀⠀⢡⢨⢀⡄⠀
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⡒⣿⢿⡤⠝⡣⠉⠁⠚⠛⠀⠤⠤⣄⡰⠁⠀⠀⠀⠉⠙⢸⠀⠀
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⡤⢯⡌⡿⡇⠘⡷⠀⠁⠀⠀⢀⣰⠢⠲⠛⣈⣸⠦⠤⠶⠴⢬⣐⣊⡂⠀
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣤⡪⡗⢫⠞⠀⠆⣀⠻⠤⠴⠐⠚⣉⢀⠦⠂⠋⠁⠀⠁⠀⠀⠀⠀⢋⠉⠇⠀
///⠀⠀⠀⠀⣀⡤⠐⠒⠘⡹⠉⢸⠇⠸⠀⠀⠀⠀⣀⣤⠴⠚⠉⠈⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠼⠀⣾⠀
///⠀⠀⠀⡰⠀⠉⠉⠀⠁⠀⠀⠈⢇⠈⠒⠒⠘⠈⢀⢡⡂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢰⠀⢸⡄
///⠀⠀⠸⣿⣆⠤⢀⡀⠀⠀⠀⠀⢘⡌⠀⠀⣀⣀⣀⡈⣤⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⠀⢸⡇
///⠀⠀⢸⣀⠀⠉⠒⠐⠛⠋⠭⠭⠍⠉⠛⠒⠒⠒⠀⠒⠚⠛⠛⠛⠩⠭⠭⠭⠭⠤⠤⠤⠤⠤⠭⠭⠉⠓⡆
///⠀⠀⠘⠿⣷⣶⣤⣤⣀⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⣤⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡇
///⠀⠀⠀⠀⠀⠉⠙⠛⠛⠻⠿⢿⣿⣿⣷⣶⣶⣶⣤⣤⣀⣁⣛⣃⣒⠿⠿⠿⠤⠠⠄⠤⠤⢤⣛⣓⣂⣻⡇
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠉⠉⠉⠙⠛⠻⠿⠿⠿⢿⣿⣿⣿⣷⣶⣶⣾⣿⣿⣿⣿⠿⠟⠁
///⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠈⠉⠉⠉⠉⠁⠀⠀⠀⠀⠀
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣼⠶⢅⠒⢄⢔⣶⡦⣤⡤⠄⣀⠀⠀⠀⠀⠀⠀⠀
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠨⡏⠀⠀⠈⠢⣙⢯⣄⠀⢨⠯⡺⡘⢄⠀⠀⠀⠀⠀
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣶⡆⠀⠀⠀⠀⠈⠓⠬⡒⠡⣀⢙⡜⡀⠓⠄⠀⠀⠀
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⡷⠿⣧⣀⡀⠀⠀⠀⠀⠀⠀⠉⠣⣞⠩⠥⠀⠼⢄⠀⠀
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⡇⠀⠀⠀⠉⢹⣶⠒⠒⠂⠈⠉⠁⠘⡆⠀⣿⣿⠫⡄⠀
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⢶⣤⣀⡀⠀⠀⢸⡿⠀⠀⠀⠀⠀⢀⠞⠀⠀⢡⢨⢀⡄⠀
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⡒⣿⢿⡤⠝⡣⠉⠁⠚⠛⠀⠤⠤⣄⡰⠁⠀⠀⠀⠉⠙⢸⠀⠀
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⡤⢯⡌⡿⡇⠘⡷⠀⠁⠀⠀⢀⣰⠢⠲⠛⣈⣸⠦⠤⠶⠴⢬⣐⣊⡂⠀
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣤⡪⡗⢫⠞⠀⠆⣀⠻⠤⠴⠐⠚⣉⢀⠦⠂⠋⠁⠀⠁⠀⠀⠀⠀⢋⠉⠇⠀
/// ⠀⠀⠀⠀⣀⡤⠐⠒⠘⡹⠉⢸⠇⠸⠀⠀⠀⠀⣀⣤⠴⠚⠉⠈⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠼⠀⣾⠀
/// ⠀⠀⠀⡰⠀⠉⠉⠀⠁⠀⠀⠈⢇⠈⠒⠒⠘⠈⢀⢡⡂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢰⠀⢸⡄
/// ⠀⠀⠸⣿⣆⠤⢀⡀⠀⠀⠀⠀⢘⡌⠀⠀⣀⣀⣀⡈⣤⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⠀⢸⡇
/// ⠀⠀⢸⣀⠀⠉⠒⠐⠛⠋⠭⠭⠍⠉⠛⠒⠒⠒⠀⠒⠚⠛⠛⠛⠩⠭⠭⠭⠭⠤⠤⠤⠤⠤⠭⠭⠉⠓⡆
/// ⠀⠀⠘⠿⣷⣶⣤⣤⣀⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⣤⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡇
/// ⠀⠀⠀⠀⠀⠉⠙⠛⠛⠻⠿⢿⣿⣿⣷⣶⣶⣶⣤⣤⣀⣁⣛⣃⣒⠿⠿⠿⠤⠠⠄⠤⠤⢤⣛⣓⣂⣻⡇
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠉⠉⠉⠙⠛⠻⠿⠿⠿⢿⣿⣿⣿⣷⣶⣶⣾⣿⣿⣿⣿⠿⠟⠁
/// ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠈⠉⠉⠉⠉⠁⠀⠀⠀⠀⠀
interface IBigStepper {
/// @notice Performs a single instruction step from a given prestate and returns the poststate
/// hash.
......
packages/contracts-bedrock/contracts/test/FaultDisputeGame.t.sol
View file @ 9d68af5b
......@@ -11,7 +11,6 @@ import "../libraries/DisputeTypes.sol";
import "../libraries/DisputeErrors.sol";
import { LibClock } from "../dispute/lib/LibClock.sol";
import { LibPosition } from "../dispute/lib/LibPosition.sol";
import { Bytes } from "../libraries/Bytes.sol";
import { IBigStepper } from "../dispute/interfaces/IBigStepper.sol";
contract FaultDisputeGame_Init is DisputeGameFactory_Init {
......@@ -30,7 +29,7 @@ contract FaultDisputeGame_Init is DisputeGameFactory_Init {
function init(Claim rootClaim, Claim absolutePrestate) public {
super.setUp();
// Deploy an implementation of the fault game
gameImpl = new FaultDisputeGame(absolutePrestate, 4, new BigStepper(absolutePrestate));
gameImpl = new FaultDisputeGame(absolutePrestate, 4, new AlphabetVM(absolutePrestate));
// Register the game implementation with the factory.
factory.setImplementation(GAME_TYPE, gameImpl);
// Create a new game.
......@@ -369,7 +368,6 @@ contract GamePlayer {
// If we are past the maximum depth, break the recursion and step.
if (movePos.depth() > maxDepth) {
uint256 stateIndex;
Position statePos;
bytes memory preStateTrace;
// First, we need to find the pre/post state index depending on whether we
......@@ -380,7 +378,7 @@ contract GamePlayer {
Position leafPos = isAttack
? Position.wrap(Position.unwrap(parentPos) - 1)
: Position.wrap(Position.unwrap(parentPos) + 1);
statePos = leafPos;
Position statePos = leafPos;
// Walk up until the valid position that commits to the prestate's
// trace index is found.
......@@ -403,7 +401,11 @@ contract GamePlayer {
}
// Grab the trace up to the prestate's trace index.
preStateTrace = traceAt(isAttack ? statePos : parentPos);
if (isAttack) {
preStateTrace = abi.encode(statePos.traceIndex(maxDepth), traceAt(statePos));
} else {
preStateTrace = abi.encode(parentPos.traceIndex(maxDepth), traceAt(parentPos));
}
}
// Perform the step and halt recursion.
......@@ -446,19 +448,19 @@ contract GamePlayer {
return uint256(vm.load(address(gameProxy), bytes32(uint256(1))));
}
/// @notice Returns the preimage of a player's claim that commits to a given trace index.
function traceAt(Position _position) public view returns (bytes memory trace_) {
/// @notice Returns the state at the trace index within the player's trace.
function traceAt(Position _position) public view returns (uint256 state_) {
return traceAt(_position.traceIndex(maxDepth));
}
/// @notice Returns the preimage of a player's claim that commits to a given trace index.
function traceAt(uint256 _traceIndex) public view returns (bytes memory trace_) {
return Bytes.slice(trace, 0, _traceIndex + 1);
/// @notice Returns the state at the trace index within the player's trace.
function traceAt(uint256 _traceIndex) public view returns (uint256 state_) {
return uint256(uint8(trace[_traceIndex]));
}
/// @notice Returns the player's claim that commits to a given trace index.
function claimAt(uint256 _traceIndex) public view returns (Claim claim_) {
return Claim.wrap(keccak256(traceAt(_traceIndex)));
return Claim.wrap(keccak256(abi.encode(_traceIndex, traceAt(_traceIndex))));
}
/// @notice Returns the player's claim that commits to a given trace index.
......@@ -470,29 +472,24 @@ contract GamePlayer {
contract OneVsOne_Arena is FaultDisputeGame_Init {
/// @dev The absolute prestate of the trace.
Claim internal constant ABSOLUTE_PRESTATE = Claim.wrap(bytes32(uint256(15)));
/// @dev The honest participant.
GamePlayer internal honest;
/// @dev The dishonest participant.
GamePlayer internal dishonest;
/// @dev The defender.
GamePlayer internal defender;
/// @dev The challenger.
GamePlayer internal challenger;
function init(
GamePlayer _honest,
GamePlayer _dishonest,
Claim _rootClaim
) public {
super.init(_rootClaim, ABSOLUTE_PRESTATE);
// Deploy a new honest player.
honest = _honest;
// Deploy a new dishonest player.
dishonest = _dishonest;
function init(GamePlayer _defender, GamePlayer _challenger) public {
Claim rootClaim = Claim.wrap(keccak256(abi.encode(15, _defender.traceAt(15))));
super.init(rootClaim, ABSOLUTE_PRESTATE);
defender = _defender;
challenger = _challenger;
// Set the counterparties.
honest.init(gameProxy, dishonest, vm);
dishonest.init(gameProxy, honest, vm);
defender.init(gameProxy, challenger, vm);
challenger.init(gameProxy, defender, vm);
// Label actors for trace.
vm.label(address(honest), "HonestPlayer");
vm.label(address(dishonest), "DishonestPlayer");
vm.label(address(challenger), "Challenger");
vm.label(address(defender), "Defender");
}
}
......@@ -500,17 +497,17 @@ contract FaultDisputeGame_ResolvesCorrectly_IncorrectRoot is OneVsOne_Arena {
function setUp() public override {
GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
GamePlayer dishonest = new FullyDivergentPlayer(ABSOLUTE_PRESTATE);
super.init(honest, dishonest, Claim.wrap(keccak256(dishonest.trace())));
super.init(dishonest, honest);
}
function test_resolvesCorrectly_succeeds() public {
// Play the game until a step is forced.
honest.play(0);
challenger.play(0);
// Resolve the game and assert that the honest player challenged the root
// claim successfully.
assertEq(uint8(gameProxy.resolve()), uint8(GameStatus.CHALLENGER_WINS));
assertFalse(honest.failedToStep());
assertFalse(defender.failedToStep());
}
}
......@@ -518,17 +515,17 @@ contract FaultDisputeGame_ResolvesCorrectly_CorrectRoot is OneVsOne_Arena {
function setUp() public override {
GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
GamePlayer dishonest = new FullyDivergentPlayer(ABSOLUTE_PRESTATE);
super.init(honest, dishonest, Claim.wrap(keccak256(honest.trace())));
super.init(honest, dishonest);
}
function test_resolvesCorrectly_succeeds() public {
// Play the game until a step is forced.
dishonest.play(0);
challenger.play(0);
// Resolve the game and assert that the dishonest player challenged the root
// claim unsuccessfully.
assertEq(uint8(gameProxy.resolve()), uint8(GameStatus.DEFENDER_WINS));
assertTrue(dishonest.failedToStep());
assertTrue(challenger.failedToStep());
}
}
......@@ -536,17 +533,17 @@ contract FaultDisputeGame_ResolvesCorrectly_IncorrectRoot2 is OneVsOne_Arena {
function setUp() public override {
GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
GamePlayer dishonest = new HalfDivergentPlayer(ABSOLUTE_PRESTATE);
super.init(honest, dishonest, Claim.wrap(keccak256(dishonest.trace())));
super.init(dishonest, honest);
}
function test_resolvesCorrectly_succeeds() public {
// Play the game until a step is forced.
honest.play(0);
challenger.play(0);
// Resolve the game and assert that the honest player challenged the root
// claim successfully.
assertEq(uint8(gameProxy.resolve()), uint8(GameStatus.CHALLENGER_WINS));
assertFalse(honest.failedToStep());
assertFalse(defender.failedToStep());
}
}
......@@ -554,17 +551,17 @@ contract FaultDisputeGame_ResolvesCorrectly_CorrectRoot2 is OneVsOne_Arena {
function setUp() public override {
GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
GamePlayer dishonest = new HalfDivergentPlayer(ABSOLUTE_PRESTATE);
super.init(honest, dishonest, Claim.wrap(keccak256(honest.trace())));
super.init(honest, dishonest);
}
function test_resolvesCorrectly_succeeds() public {
// Play the game until a step is forced.
dishonest.play(0);
challenger.play(0);
// Resolve the game and assert that the dishonest player challenged the root
// claim unsuccessfully.
assertEq(uint8(gameProxy.resolve()), uint8(GameStatus.DEFENDER_WINS));
assertTrue(dishonest.failedToStep());
assertTrue(challenger.failedToStep());
}
}
......@@ -572,17 +569,17 @@ contract FaultDisputeGame_ResolvesCorrectly_IncorrectRoot3 is OneVsOne_Arena {
function setUp() public override {
GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
GamePlayer dishonest = new EarlyDivergentPlayer(ABSOLUTE_PRESTATE);
super.init(honest, dishonest, Claim.wrap(keccak256(dishonest.trace())));
super.init(dishonest, honest);
}
function test_resolvesCorrectly_succeeds() public {
// Play the game until a step is forced.
honest.play(0);
challenger.play(0);
// Resolve the game and assert that the honest player challenged the root
// claim successfully.
assertEq(uint8(gameProxy.resolve()), uint8(GameStatus.CHALLENGER_WINS));
assertFalse(honest.failedToStep());
assertFalse(defender.failedToStep());
}
}
......@@ -590,17 +587,17 @@ contract FaultDisputeGame_ResolvesCorrectly_CorrectRoot3 is OneVsOne_Arena {
function setUp() public override {
GamePlayer honest = new HonestPlayer(ABSOLUTE_PRESTATE);
GamePlayer dishonest = new EarlyDivergentPlayer(ABSOLUTE_PRESTATE);
super.init(honest, dishonest, Claim.wrap(keccak256(honest.trace())));
super.init(honest, dishonest);
}
function test_resolvesCorrectly_succeeds() public {
// Play the game until a step is forced.
dishonest.play(0);
challenger.play(0);
// Resolve the game and assert that the dishonest player challenged the root
// claim unsuccessfully.
assertEq(uint8(gameProxy.resolve()), uint8(GameStatus.DEFENDER_WINS));
assertTrue(dishonest.failedToStep());
assertTrue(challenger.failedToStep());
}
}
......@@ -659,7 +656,7 @@ contract EarlyDivergentPlayer is GamePlayer {
// MOCK VMS //
////////////////////////////////////////////////////////////////
contract BigStepper is IBigStepper {
contract AlphabetVM is IBigStepper {
Claim internal immutable ABSOLUTE_PRESTATE;
constructor(Claim _absolutePrestate) {
......@@ -672,13 +669,18 @@ contract BigStepper is IBigStepper {
view
returns (bytes32 postState_)
{
// STF: n -> concat(n, n[n.len-1] + 1)
uint8 postState = (
_stateData.length == 0
? uint8(uint256(Claim.unwrap(ABSOLUTE_PRESTATE)))
: uint8(_stateData[_stateData.length - 1])
) + 1;
// Hash the trace for the claim.
postState_ = keccak256(bytes.concat(_stateData, bytes1(postState)));
uint256 traceIndex;
uint256 claim;
if (_stateData.length == 0) {
// If the state data is empty, then the absolute prestate is the claim.
traceIndex = 0;
claim = uint256(Claim.unwrap(ABSOLUTE_PRESTATE));
} else {
// Otherwise, decode the state data.
(traceIndex, claim) = abi.decode(_stateData, (uint256, uint256));
traceIndex++;
}
// STF: n -> n + 1
postState_ = keccak256(abi.encode(traceIndex, claim + 1));
}
}
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