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rollup_prover.ts
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rollup_prover.ts
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import {
createEmptyValue,
DeepMerkleSubTree,
ProvableMerkleTreeUtils,
} from 'snarky-smt';
import {
Circuit,
Experimental,
Field,
isReady,
SelfProof,
Struct,
AccountUpdate,
} from 'snarkyjs';
import { NFT_SUPPLY } from './constant';
import { Action } from './models/action';
import { ActionBatch } from './models/action_batch';
import { DUMMY_NFT_HASH, DUMMY_NFT_ID, NFT } from './models/nft';
import { MerkleProof } from './models/proofs';
import { RollupState } from './models/rollup_state';
import { RollupStateTransition } from './models/rollup_state_transition';
export { NftRollupProver, NftRollupProof, NftRollupProverHelper };
await isReady;
class NFTResult extends Struct({ id: Field, hash: Field }) {}
function rollupStateTransform(currStateData: {
currAction: Action;
currMerkleProof: MerkleProof;
currentActionsHash: Field;
currentIndex: Field;
currentNftsCommitment: Field;
}): {
currentActionsHash: Field;
currentIndex: Field;
currentNftsCommitment: Field;
} {
let {
currAction,
currMerkleProof,
currentActionsHash,
currentIndex,
currentNftsCommitment,
} = currStateData;
// compute actions hash
let eventHash = AccountUpdate.SequenceEvents.hash([currAction.toFields()]);
currentActionsHash = Circuit.if(
currAction.isDummyData(),
currentActionsHash,
AccountUpdate.SequenceEvents.updateSequenceState(
currentActionsHash,
eventHash
)
);
// process mint
let isMint = currAction.isMint();
currentIndex = Circuit.if(
isMint.and(currentIndex.lt(NFT_SUPPLY)),
currentIndex.add(1),
currentIndex
);
let mintNftHash = (currAction.nft as NFT).assignId(currentIndex).hash();
let mintResult = { id: currentIndex, hash: mintNftHash };
// process transfer
let isTransfer = currAction.isTransfer();
let transferNftHash = (currAction.nft as NFT).hash();
let transferResult = {
id: currAction.nft.id,
hash: transferNftHash,
};
// process dummy data
let isDummyData = currAction.isDummyData();
let dummyResult = { id: DUMMY_NFT_ID, hash: DUMMY_NFT_HASH };
let originalHashValid = ProvableMerkleTreeUtils.checkMembership(
currMerkleProof,
currentNftsCommitment,
Circuit.if(isMint, currentIndex, currAction.nft.id),
currAction.originalNFTHash,
Field,
{ hashValue: false }
);
let nftResult = Circuit.switch([isMint, isTransfer, isDummyData], NFTResult, [
Circuit.if(
currentIndex.lt(NFT_SUPPLY).and(originalHashValid),
mintResult,
dummyResult
),
Circuit.if(originalHashValid, transferResult, dummyResult),
dummyResult,
]);
Circuit.log('isProofValid: ', originalHashValid);
currentNftsCommitment = Circuit.if(
Circuit.equal(nftResult, dummyResult),
currentNftsCommitment,
ProvableMerkleTreeUtils.computeRoot(
currMerkleProof,
nftResult.id,
nftResult.hash,
Field,
{ hashValue: false }
)
);
return { currentActionsHash, currentIndex, currentNftsCommitment };
}
let NftRollupProver = Experimental.ZkProgram({
publicInput: RollupStateTransition,
methods: {
commitActionBatch: {
privateInputs: [ActionBatch],
method(stateTransition: RollupStateTransition, actionBatch: ActionBatch) {
let prevNftsCommitment = stateTransition.source.nftsCommitment;
let prevCurrIndex = stateTransition.source.currentIndex;
let prevCurrActionsHash = stateTransition.source.currentActionsHash;
let afterNfsCommitment = stateTransition.target.nftsCommitment;
let afterCurrIndex = stateTransition.target.currentIndex;
let afterCurrActonsHash = stateTransition.target.currentActionsHash;
let currentActionsHash = prevCurrActionsHash;
let currentIndex = prevCurrIndex;
let currentNftsCommitment = prevNftsCommitment;
for (let i = 0, len = ActionBatch.batchSize; i < len; i++) {
let currAction = actionBatch.actions[i];
let currMerkleProof = actionBatch.merkleProofs[i];
let newState = rollupStateTransform({
currAction: currAction as Action,
currMerkleProof,
currentActionsHash,
currentIndex,
currentNftsCommitment,
});
currentActionsHash = newState.currentActionsHash;
currentIndex = newState.currentIndex;
currentNftsCommitment = newState.currentNftsCommitment;
}
currentActionsHash.assertEquals(
afterCurrActonsHash,
'currentActionsHash assertion failed'
);
currentIndex.assertEquals(
afterCurrIndex,
'currentIndex assertion failed'
);
currentNftsCommitment.assertEquals(
afterNfsCommitment,
'currentNftsCommitment assertion failed'
);
},
},
commitAction: {
privateInputs: [Action, MerkleProof],
method(
stateTransition: RollupStateTransition,
currAction: Action,
currMerkleProof: MerkleProof
) {
let prevNftsCommitment = stateTransition.source.nftsCommitment;
let prevCurrIndex = stateTransition.source.currentIndex;
let prevCurrActionsHash = stateTransition.source.currentActionsHash;
let afterNfsCommitment = stateTransition.target.nftsCommitment;
let afterCurrIndex = stateTransition.target.currentIndex;
let afterCurrActonsHash = stateTransition.target.currentActionsHash;
let { currentActionsHash, currentIndex, currentNftsCommitment } =
rollupStateTransform({
currAction,
currMerkleProof,
currentActionsHash: prevCurrActionsHash,
currentIndex: prevCurrIndex,
currentNftsCommitment: prevNftsCommitment,
});
currentActionsHash.assertEquals(
afterCurrActonsHash,
'currentActionsHash assertion failed'
);
currentIndex.assertEquals(
afterCurrIndex,
'currentIndex assertion failed'
);
currentNftsCommitment.assertEquals(
afterNfsCommitment,
'currentNftsCommitment assertion failed'
);
},
},
merge: {
privateInputs: [SelfProof, SelfProof],
method(
stateTransition: RollupStateTransition,
p1: SelfProof<RollupStateTransition>,
p2: SelfProof<RollupStateTransition>
) {
p1.verify();
p2.verify();
(p1.publicInput.source as RollupState).assertEquals(
stateTransition.source as RollupState
);
(p1.publicInput.target as RollupState).assertEquals(
p2.publicInput.source as RollupState
);
(p2.publicInput.target as RollupState).assertEquals(
stateTransition.target as RollupState
);
},
},
},
});
class NftRollupProof extends Experimental.ZkProgram.Proof(NftRollupProver) {}
let NftRollupProverHelper = {
commitActionBatch(
actions: Action[],
currState: RollupState,
deepSubTree: DeepMerkleSubTree<Field>
): { stateTransition: RollupStateTransition; actionBatch: ActionBatch } {
if (actions.length > ActionBatch.batchSize) {
throw new Error(
`Actions exceeding a fixed batch size of ${ActionBatch.batchSize} cannot be processed`
);
}
let currentActionsHash = currState.currentActionsHash;
let currentIndex = currState.currentIndex.toBigInt();
let newMerkleProofs: MerkleProof[] = [];
let dummyProof = createEmptyValue(MerkleProof);
for (let i = 0, len = actions.length; i < len; i++) {
let currAction = actions[i];
// compute new actions hash
let eventHash = AccountUpdate.SequenceEvents.hash([
currAction.toFields(),
]);
currentActionsHash = AccountUpdate.SequenceEvents.updateSequenceState(
currentActionsHash,
eventHash
);
let currentNftId = currAction.nft.id;
let currentNftIdBigInt = currentNftId.toBigInt();
// compute new current index and root
if (currAction.isMint().toBoolean()) {
// mint
if (currentIndex < NFT_SUPPLY) {
currentIndex = currentIndex + 1n;
let currentNftHash = (currAction.nft as NFT)
.assignId(Field(currentIndex))
.hash();
let currentMerkleProof = deepSubTree.prove(currentIndex);
newMerkleProofs.push(currentMerkleProof);
deepSubTree.update(currentIndex, currentNftHash);
} else {
newMerkleProofs.push(dummyProof);
}
}
if (currAction.isTransfer().toBoolean()) {
let nftExist = deepSubTree.has(
currentNftIdBigInt,
currAction.originalNFTHash
);
if (nftExist) {
console.log('nft exist, id: ', currentNftId.toString());
let currentMerkleProof = deepSubTree.prove(currentNftIdBigInt);
newMerkleProofs.push(currentMerkleProof);
let currentNftHash = (currAction.nft as NFT).hash();
deepSubTree.update(currentNftIdBigInt, currentNftHash);
} else {
console.log('fake nft, id: ', currentNftId.toString());
newMerkleProofs.push(dummyProof);
}
}
}
// pad action array
let dummyAction = Action.empty();
for (let i = actions.length; i < ActionBatch.batchSize; i++) {
actions.push(dummyAction);
newMerkleProofs.push(dummyProof);
}
let actionBatch = new ActionBatch({
actions,
merkleProofs: newMerkleProofs,
});
return {
stateTransition: RollupStateTransition.from({
source: currState,
target: RollupState.from({
nftsCommitment: deepSubTree.getRoot(),
currentIndex: Field(currentIndex),
currentActionsHash,
}),
}),
actionBatch,
};
},
commitAction(
currAction: Action,
index: bigint,
currState: RollupState,
deepSubTree: DeepMerkleSubTree<Field>
): { stateTransition: RollupStateTransition; merkleProof: MerkleProof } {
let currentIndex = currState.currentIndex;
let newCurrentIndex = currentIndex.toBigInt();
let nftsCommitment = currState.nftsCommitment;
let currentActionsHash = currState.currentActionsHash;
let supply = NFT_SUPPLY;
// compute new actions hash
let eventHash = AccountUpdate.SequenceEvents.hash([currAction.toFields()]);
let newCurrentActionsHash =
AccountUpdate.SequenceEvents.updateSequenceState(
currentActionsHash,
eventHash
);
let currentNftId = currAction.nft.id;
let currentNftIdBigInt = currentNftId.toBigInt();
let currentNftHash = (currAction.nft as NFT).hash();
let merkleProof = deepSubTree.prove(index);
if (currAction.isMint().toBoolean() && newCurrentIndex < supply) {
// mint
newCurrentIndex = newCurrentIndex + 1n;
currentNftHash = (currAction.nft as NFT).assignId(currentNftId).hash();
nftsCommitment = deepSubTree.update(newCurrentIndex, currentNftHash);
}
if (currAction.isTransfer().toBoolean()) {
let nftExist = deepSubTree.has(
currentNftIdBigInt,
currAction.originalNFTHash
);
if (nftExist) {
nftsCommitment = deepSubTree.update(currentNftIdBigInt, currentNftHash);
}
}
return {
stateTransition: RollupStateTransition.from({
source: currState,
target: RollupState.from({
nftsCommitment,
currentIndex: Field(newCurrentIndex),
currentActionsHash: newCurrentActionsHash,
}),
}),
merkleProof,
};
},
merge(
p1: SelfProof<RollupStateTransition>,
p2: SelfProof<RollupStateTransition>
): RollupStateTransition {
let source = p1.publicInput.source;
let target = p2.publicInput.target;
return RollupStateTransition.from({
source: source as RollupState,
target: target as RollupState,
});
},
};