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305 lines
10 KiB
305 lines
10 KiB
// Copyright (c) 2016-2021 The Hush developers
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// Distributed under the GPLv3 software license, see the accompanying
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// file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html
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/******************************************************************************
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* Copyright © 2014-2019 The SuperNET Developers. *
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* *
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* See the AUTHORS, DEVELOPER-AGREEMENT and LICENSE files at *
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* the top-level directory of this distribution for the individual copyright *
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* holder information and the developer policies on copyright and licensing. *
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* *
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* Unless otherwise agreed in a custom licensing agreement, no part of the *
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* SuperNET software, including this file may be copied, modified, propagated *
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* or distributed except according to the terms contained in the LICENSE file *
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* *
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* Removal or modification of this copyright notice is prohibited. *
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* *
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******************************************************************************/
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#include <cryptoconditions.h>
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#include "hash.h"
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#include "main.h"
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#include "chain.h"
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#include "streams.h"
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#include "script/cc.h"
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#include "cc/betprotocol.h"
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#include "cc/eval.h"
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#include "cc/utils.h"
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#include "primitives/transaction.h"
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int32_t hush_nextheight();
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std::vector<CC*> BetProtocol::PlayerConditions()
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{
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std::vector<CC*> subs;
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for (int i=0; i<players.size(); i++)
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subs.push_back(CCNewSecp256k1(players[i]));
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return subs;
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}
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CC* BetProtocol::MakeDisputeCond()
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{
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CC *disputePoker = CCNewEval(E_MARSHAL(
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ss << disputeCode << VARINT(waitBlocks) << vmParams;
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));
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CC *anySig = CCNewThreshold(1, PlayerConditions());
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return CCNewThreshold(2, {disputePoker, anySig});
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}
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/*
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* spendFee is the amount assigned to each output, for the purposes of posting
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* dispute / evidence.
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*/
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CMutableTransaction BetProtocol::MakeSessionTx(CAmount spendFee)
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{
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CMutableTransaction mtx = CreateNewContextualCMutableTransaction(Params().GetConsensus(), hush_nextheight());
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CC *disputeCond = MakeDisputeCond();
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mtx.vout.push_back(CTxOut(spendFee, CCPubKey(disputeCond)));
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cc_free(disputeCond);
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for (int i=0; i<players.size(); i++) {
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CC *cond = CCNewSecp256k1(players[i]);
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mtx.vout.push_back(CTxOut(spendFee, CCPubKey(cond)));
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cc_free(cond);
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}
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return mtx;
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}
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CMutableTransaction BetProtocol::MakeDisputeTx(uint256 signedSessionTxHash, uint256 vmResultHash)
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{
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CMutableTransaction mtx = CreateNewContextualCMutableTransaction(Params().GetConsensus(), hush_nextheight());
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CC *disputeCond = MakeDisputeCond();
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mtx.vin.push_back(CTxIn(signedSessionTxHash, 0, CScript()));
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std::vector<unsigned char> result(vmResultHash.begin(), vmResultHash.begin()+32);
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mtx.vout.push_back(CTxOut(0, CScript() << OP_RETURN << result));
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return mtx;
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}
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CMutableTransaction BetProtocol::MakePostEvidenceTx(uint256 signedSessionTxHash,
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int playerIdx, std::vector<unsigned char> state)
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{
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CMutableTransaction mtx = CreateNewContextualCMutableTransaction(Params().GetConsensus(), hush_nextheight());
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mtx.vin.push_back(CTxIn(signedSessionTxHash, playerIdx+1, CScript()));
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mtx.vout.push_back(CTxOut(0, CScript() << OP_RETURN << state));
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return mtx;
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}
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CC* BetProtocol::MakePayoutCond(uint256 signedSessionTxHash)
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{
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// TODO: 2/3 majority
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CC* agree = CCNewThreshold(players.size(), PlayerConditions());
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CC *import;
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{
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CC *importEval = CCNewEval(E_MARSHAL(
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ss << EVAL_IMPORTPAYOUT << signedSessionTxHash;
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));
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CC *oneof = CCNewThreshold(1, PlayerConditions());
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import = CCNewThreshold(2, {oneof, importEval});
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}
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return CCNewThreshold(1, {agree, import});
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}
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CMutableTransaction BetProtocol::MakeStakeTx(CAmount totalPayout, uint256 signedSessionTxHash)
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{
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CMutableTransaction mtx = CreateNewContextualCMutableTransaction(Params().GetConsensus(), hush_nextheight());
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CC *payoutCond = MakePayoutCond(signedSessionTxHash);
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mtx.vout.push_back(CTxOut(totalPayout, CCPubKey(payoutCond)));
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cc_free(payoutCond);
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return mtx;
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}
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CMutableTransaction BetProtocol::MakeAgreePayoutTx(std::vector<CTxOut> payouts,
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uint256 signedStakeTxHash)
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{
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CMutableTransaction mtx = CreateNewContextualCMutableTransaction(Params().GetConsensus(), hush_nextheight());
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mtx.vin.push_back(CTxIn(signedStakeTxHash, 0, CScript()));
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mtx.vout = payouts;
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return mtx;
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}
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CMutableTransaction BetProtocol::MakeImportPayoutTx(std::vector<CTxOut> payouts,
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CTransaction signedDisputeTx, uint256 signedStakeTxHash, MoMProof momProof)
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{
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CMutableTransaction mtx = CreateNewContextualCMutableTransaction(Params().GetConsensus(), hush_nextheight());
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mtx.vin.push_back(CTxIn(signedStakeTxHash, 0, CScript()));
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mtx.vout = payouts;
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CScript proofData;
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proofData << OP_RETURN << E_MARSHAL(ss << momProof << signedDisputeTx);
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mtx.vout.insert(mtx.vout.begin(), CTxOut(0, proofData));
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return mtx;
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}
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bool GetOpReturnHash(CScript script, uint256 &hash)
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{
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std::vector<unsigned char> vHash;
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GetOpReturnData(script, vHash);
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if (vHash.size() != 32) return false;
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hash = uint256(vHash);
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return true;
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}
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/*
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* Crypto-Condition EVAL method that verifies a payout against a transaction
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* notarised on another chain.
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*
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* IN: params - condition params
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* IN: importTx - Payout transaction on value chain (KMD)
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* IN: nIn - index of input of stake
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*
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* importTx: Spends stakeTx with payouts from asset chain
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*
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* in 0: Spends Stake TX and contains ImportPayout CC
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* out 0: OP_RETURN MomProof, disputeTx
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* out 1-: arbitrary payouts
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*
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* disputeTx: Spends sessionTx.0 (opener on asset chain)
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*
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* in 0: spends sessionTx.0
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* in 1-: anything
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* out 0: OP_RETURN hash of payouts
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* out 1-: anything
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*/
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bool Eval::ImportPayout(const std::vector<uint8_t> params, const CTransaction &importTx, unsigned int nIn)
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{
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if (importTx.vout.size() == 0) return Invalid("no-vouts");
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// load data from vout[0]
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MoMProof proof;
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CTransaction disputeTx;
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{
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std::vector<unsigned char> vopret;
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GetOpReturnData(importTx.vout[0].scriptPubKey, vopret);
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if (!E_UNMARSHAL(vopret, ss >> proof; ss >> disputeTx))
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return Invalid("invalid-payload");
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}
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// Check disputeTx.0 shows correct payouts
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{
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uint256 givenPayoutsHash;
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GetOpReturnHash(disputeTx.vout[0].scriptPubKey, givenPayoutsHash);
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std::vector<CTxOut> payouts(importTx.vout.begin() + 1, importTx.vout.end());
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if (givenPayoutsHash != SerializeHash(payouts))
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return Invalid("wrong-payouts");
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}
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// Check disputeTx spends sessionTx.0
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// condition ImportPayout params is session ID from other chain
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{
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uint256 sessionHash;
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if (!E_UNMARSHAL(params, ss >> sessionHash))
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return Invalid("malformed-params");
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if (disputeTx.vin[0].prevout != COutPoint(sessionHash, 0))
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return Invalid("wrong-session");
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}
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// Check disputeTx solves momproof from vout[0]
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{
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NotarizationData data(0);
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if (!GetNotarizationData(proof.notarisationHash, data))
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return Invalid("coudnt-load-mom");
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if (data.MoM != proof.branch.Exec(disputeTx.GetHash()))
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return Invalid("mom-check-fail");
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}
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return Valid();
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}
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/*
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* Crypto-Condition EVAL method that resolves a dispute of a session
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*
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* IN: vm - AppVM virtual machine to verify states
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* IN: params - condition params
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* IN: disputeTx - transaction attempting to resolve dispute
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* IN: nIn - index of input of dispute tx
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*
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* disputeTx: attempt to resolve a dispute
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*
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* in 0: Spends Session TX first output, reveals DisputeHeader
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* out 0: OP_RETURN hash of payouts
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*/
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bool Eval::DisputePayout(AppVM &vm, std::vector<uint8_t> params, const CTransaction &disputeTx, unsigned int nIn)
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{
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if (disputeTx.vout.size() == 0) return Invalid("no-vouts");
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// get payouts hash
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uint256 payoutHash;
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if (!GetOpReturnHash(disputeTx.vout[0].scriptPubKey, payoutHash))
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return Invalid("invalid-payout-hash");
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// load params
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uint16_t waitBlocks;
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std::vector<uint8_t> vmParams;
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if (!E_UNMARSHAL(params, ss >> VARINT(waitBlocks); ss >> vmParams))
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return Invalid("malformed-params");
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// ensure that enough time has passed
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{
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CTransaction sessionTx;
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CBlockIndex sessionBlock;
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// if unconformed its too soon
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if (!GetTxConfirmed(disputeTx.vin[0].prevout.hash, sessionTx, sessionBlock))
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return Error("couldnt-get-parent");
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if (GetCurrentHeight() < sessionBlock.GetHeight() + waitBlocks)
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return Invalid("dispute-too-soon"); // Not yet
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}
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// get spends
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std::vector<CTransaction> spends;
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if (!GetSpendsConfirmed(disputeTx.vin[0].prevout.hash, spends))
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return Error("couldnt-get-spends");
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// verify result from VM
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int maxLength = -1;
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uint256 bestPayout;
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for (int i=1; i<spends.size(); i++)
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{
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std::vector<unsigned char> vmState;
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if (spends[i].vout.size() == 0) continue;
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if (!GetOpReturnData(spends[i].vout[0].scriptPubKey, vmState)) continue;
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auto out = vm.evaluate(vmParams, vmState);
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uint256 resultHash = SerializeHash(out.second);
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if (out.first > maxLength) {
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maxLength = out.first;
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bestPayout = resultHash;
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}
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// The below means that if for any reason there is a draw, the first dispute wins
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else if (out.first == maxLength) {
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if (bestPayout != payoutHash) {
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fprintf(stderr, "WARNING: VM has multiple solutions of same length\n");
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bestPayout = resultHash;
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}
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}
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}
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if (maxLength == -1) return Invalid("no-evidence");
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return bestPayout == payoutHash ? Valid() : Invalid("wrong-payout");
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}
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