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This is used to\n * determine what the value at I is a prefix for.\n * @param I commitment\n */\n public static calcIndex(I: bigint): number {\n for (let i = BigInt(0); i < BigInt(48); i++) {\n if (I & (BigInt(1) << i)) return Number(i);\n }\n return 48; // seed\n }\n\n private secrets: CommitmentSecretStoreItem[];\n\n constructor() {\n this.secrets = new Array(49) as CommitmentSecretStoreItem[];\n for (let i = 0; i < this.secrets.length; i++) {\n this.secrets[i] = { index: BigInt(0), secret: undefined };\n }\n }\n\n /**\n * Insert the commitment secret into the store and verify that the\n * secret is able to derive all prior commitment secrets that we\n * already know about.\n *\n * @param secret 32-byte secp256k1 secret\n * @param i commitment number\n */\n public insert(secret: Buffer, i: bigint) {\n const B = CommitmentSecretStore.calcIndex(i);\n\n // validate that the new secret allows derivation of known keys\n // up to the new key\n for (let b = 0; b < B; b++) {\n const existing = this.secrets[b].secret;\n const derived = CommitmentSecret.derive(secret, this.secrets[b].index, B);\n if (!derived.equals(existing)) {\n throw new Error('The secret for I is incorrect');\n }\n }\n\n // update the position\n this.secrets[Number(B)].index = i;\n this.secrets[Number(B)].secret = secret;\n }\n\n /**\n * Derives old commitment secrets from the from the compact store.\n * Throws if we do not have the commitment secret for the specified\n * commitment nmber.\n * @param i derivation number starting at 2^48-1 down to zero.\n */\n public derive(i: bigint) {\n for (let b = 0; b < this.secrets.length; b++) {\n // construct a mask of the upper bits. 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{ OpCode, Script } from '@node-dlc/bitcoin';\nimport { hash160, ripemd160 } from '@node-dlc/crypto';\n\nexport class ScriptFactory {\n /**\n * Constructs the P2MS commit script used in in the funding transaction\n * as defined in BOLT3. The pubkeys must be sorted in lexicographical\n * order.\n *\n * @param openPubKey funding_pubkey sent in open_channel\n * @param acceptPubKey funding_pubkey sent in accept_channel\n */\n public static fundingScript(\n openPubKey: Buffer,\n acceptPubKey: Buffer,\n ): Script {\n const pubkeys = [openPubKey, acceptPubKey].sort((a, b) => a.compare(b));\n return Script.p2msLock(2, ...pubkeys);\n }\n\n /**\n * Constructs an revocable sequence maturing contract using the\n * provided keys and delay. This script is used in the `to_local`\n * output of the commmitment transaction as well as the secondary\n * HTLC-Success and HTLC-Timeout transactions.\n *\n * @param revocationPubKey the revocation pubkey that has the ability\n * to perform a penalty transaction should a revoked version of this\n * output be spend.\n * @param delayedPubKey the delayed pubkey spendable after the\n * sequence delay\n * @param toSelfDelay the sequence delay in blocks\n */\n public static toLocalScript(\n revocationPubKey: Buffer,\n delayedPubKey: Buffer,\n toSelfDelay: number,\n ): Script {\n return new Script(\n OpCode.OP_IF,\n revocationPubKey,\n OpCode.OP_ELSE,\n Script.number(toSelfDelay),\n OpCode.OP_CHECKSEQUENCEVERIFY,\n OpCode.OP_DROP,\n delayedPubKey,\n OpCode.OP_ENDIF,\n OpCode.OP_CHECKSIG,\n ); // prettier-ignore\n }\n\n /**\n * Constructs the script for an offered HTLC output of a commitment\n * transaction as defined in BOLT3. This enables on-chain resolution\n * of an HTLC to the local node via the secondary HTLC-Timeout\n * transaction. This secondary transaction is both sequence delayed\n * and timelocked and requires signatures by both parties to prevent\n * premature spending. The remote node can immediately resolve the\n * transaction wit knowledge of the preimage.\n *\n * Revocable with witness:\n * [revocationSig, revocationPubKey]\n *\n * Pay to local via the HTLC-Timeout transaction by using witness\n * [0, remoteHtlcSig, localHtlcSig, <>]\n *\n * Pay to remote counterparty without delay using witness\n * [remoteHtlcSig, preimage]\n *\n * @param paymentHash\n * @param revocationPubKey\n * @param localHtlcPubKey\n * @param remoteHtlcPubKey\n */\n public static offeredHtlcScript(\n paymentHash: Buffer,\n revocationPubKey: Buffer,\n localHtlcPubKey: Buffer,\n remoteHtlcPubKey: Buffer,\n ): Script {\n return new Script(\n // to remote with revocation key\n OpCode.OP_DUP, OpCode.OP_HASH160, hash160(revocationPubKey), OpCode.OP_EQUAL,\n OpCode.OP_IF,\n OpCode.OP_CHECKSIG,\n OpCode.OP_ELSE,\n remoteHtlcPubKey, OpCode.OP_SWAP, OpCode.OP_SIZE, Script.number(32), OpCode.OP_EQUAL,\n OpCode.OP_NOTIF,\n // to local via HTLC-Timeout transaction (timelocked)\n OpCode.OP_DROP, OpCode.OP_2, OpCode.OP_SWAP, localHtlcPubKey, OpCode.OP_2, OpCode.OP_CHECKMULTISIG,\n OpCode.OP_ELSE,\n // to remote with preimage and signature\n OpCode.OP_HASH160, ripemd160(paymentHash), OpCode.OP_EQUALVERIFY,\n OpCode.OP_CHECKSIG,\n OpCode.OP_ENDIF,\n OpCode.OP_ENDIF,\n ); // prettier-ignore\n }\n\n /**\n * Constructs the script for a received HTLC output of a commitment\n * transaction as defined in BOLT3. This enables on-chain resolution\n * of an HTLC to the local node via the secondary HTLC-Success\n * transaction. This secondary transaction is sequence delayed and\n * thus local spends require both parties signatures. The remote\n * node can perform a timeout of this output after the timelock\n * expires.\n *\n * Revocable with witness:\n * [revocationSig, revocationPubKey]\n *\n * Pay to local via the HTLC-Success transaction by using witness\n * [0, remoteHtlcSig, localHtlcSig, preimage]\n *\n * Pay to remote counterparty after the CLTV expiry using witness\n * [remoteHtlcSig, <>]\n *\n * @param paymentHash\n * @param cltvExpiry\n * @param revocationPubKey\n * @param localHtlcPubKey\n * @param remoteHtlcPubKey\n */\n public static receivedHtlcScript(\n paymentHash: Buffer,\n cltvExpiry: number,\n revocationPubKey: Buffer,\n localHtlcPubKey: Buffer,\n remoteHtlcPubKey: Buffer,\n ): Script {\n return new Script(\n // to remote with revocation key\n OpCode.OP_DUP, OpCode.OP_HASH160, hash160(revocationPubKey), OpCode.OP_EQUAL,\n OpCode.OP_IF,\n OpCode.OP_CHECKSIG,\n OpCode.OP_ELSE,\n remoteHtlcPubKey, OpCode.OP_SWAP, OpCode.OP_SIZE, Script.number(32), OpCode.OP_EQUAL,\n OpCode.OP_IF,\n // to local via 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BigInt(663) : BigInt(703);\n }\n\n // Calculate the HTLC less fees\n const feeInSats = (feeWeight * feePerKw) / BigInt(1000);\n const satsLessFee = valueInSats - feeInSats;\n\n // Only keep HTLCs greater than the dustLimitSatoshi for the tx\n if (satsLessFee >= dustLimitSatoshi.sats) {\n unprunedHtlcs.push(htlc);\n }\n }\n\n // 4. calculate base fee\n const weight = 724 + unprunedHtlcs.length * 172;\n const baseFee = (BigInt(weight) * feePerKw) / BigInt(1000);\n\n // 5. substract base fee from funding node\n if (isFunderLocal) {\n const newValue = localValue.sats - baseFee;\n if (newValue > BigInt(0)) {\n localValue = Value.fromSats(newValue);\n } else {\n localValue = Value.zero();\n }\n } else {\n const newValue = remoteValue.sats - baseFee;\n if (newValue > BigInt(0)) {\n remoteValue = Value.fromSats(newValue);\n } else {\n remoteValue = Value.zero();\n }\n }\n\n // 6/7. add unpruned offered/received HTLCs\n const txouts: Array<[TxOut, Htlc?]> = [];\n for (const htlc of unprunedHtlcs) {\n const witnessScript: Script =\n (!reverseHtlcs && htlc.direction === HtlcDirection.Offered) ||\n (reverseHtlcs && htlc.direction === HtlcDirection.Accepted)\n ? 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{ Value } from '@node-dlc/bitcoin';\nimport {\n ContractDescriptorV1,\n ContractInfoV0,\n DigitDecompositionEventDescriptorV0,\n MessageType,\n OracleAnnouncementV0,\n OracleInfoV0,\n OrderOfferV0,\n OrderPositionInfoV0,\n PayoutFunctionV0,\n RoundingIntervalsV0,\n} from '@node-dlc/messaging';\nimport {\n BitcoinNetwork,\n BitcoinNetworks,\n chainHashFromNetwork,\n} from 'bitcoin-networks';\nimport Decimal from 'decimal.js';\n\nimport { dustThreshold } from '../CoinSelect';\nimport { getFinalizerByCount } from '../TxFinalizer';\nimport { CoveredCall } from './CoveredCall';\nimport { LinearPayout } from './LinearPayout';\nimport { LongCall } from './LongCall';\nimport { LongPut } from './LongPut';\nimport { ShortPut } from './ShortPut';\n\nexport const UNIT_MULTIPLIER = {\n bits: BigInt(1e2),\n sats: BigInt(1),\n};\n\n/**\n * Round a number to the nearest multiple of a given multiplier.\n *\n * @param num - The number to be rounded.\n * @param multiplier - The multiplier to round to.\n * @returns The number rounded to the nearest multiple of the multiplier.\n *\n * @example\n * ```typescript\n * // Example: rounding to nearest 100\n * const number = BigInt(354);\n * const multiplier = BigInt(100);\n * const roundedNumber = roundToNearestMultiplier(number, multiplier);\n * console.log(roundedNumber); // Output: 300\n * ```\n */\nexport const roundToNearestMultiplier = (\n num: bigint,\n multiplier: bigint,\n): bigint => (num / multiplier) * multiplier;\n\n/**\n * Round a number up to the nearest multiple of a given multiplier.\n *\n * @param num - The number to be rounded.\n * @param multiplier - The multiplier to round to.\n * @returns The number rounded up to the nearest multiple of the multiplier.\n *\n * @example\n * ```typescript\n * // Example: rounding up to nearest 100\n * const number = BigInt(354);\n * const multiplier = BigInt(100);\n * const roundedNumber = roundToNearestMultiplier(number, multiplier);\n * console.log(roundedNumber); // Output: 400\n * ```\n */\nexport const roundUpToNearestMultiplier = (\n num: bigint,\n multiplier: bigint,\n): bigint => ((num + multiplier - BigInt(1)) / multiplier) * multiplier;\n\nexport const roundDownToNearestMultiplier = (\n num: bigint,\n multiplier: bigint,\n): bigint => num - (num % multiplier);\n\nexport type DlcParty = 'offeror' | 'acceptor' | 'neither';\n\n/**\n * Compute rounding intervals for a linear or hyperbola payout curve\n *\n * @param {number | bigint | Value} rounding rounding interval in sats\n * @param {number | bigint | Value} contractSize contract size in sats\n * @returns rounding mod for contract size\n */\nexport const computeRoundingModulus = (\n rounding: number | bigint | Value,\n contractSize: number | bigint | Value,\n): bigint => {\n const roundingInSats =\n rounding instanceof Value ? rounding.sats : BigInt(rounding);\n\n const contractSizeInSats =\n contractSize instanceof Value ? contractSize.sats : BigInt(contractSize);\n\n return (roundingInSats * contractSizeInSats) / BigInt(1e8);\n};\n\n/**\n * Get digit decomposition event descriptor from oracle announcement\n *\n * @param {OracleAnnouncementV0} announcement oracle announcement\n * @returns {DigitDecompositionEventDescriptorV0} event descriptor\n */\nexport const getDigitDecompositionEventDescriptor = (\n announcement: OracleAnnouncementV0,\n): DigitDecompositionEventDescriptorV0 => {\n if (\n announcement.oracleEvent.eventDescriptor.type !==\n MessageType.DigitDecompositionEventDescriptorV0\n )\n throw Error('Only DigitDecompositionEventDescriptorV0 currently supported');\n\n const eventDescriptor = announcement.oracleEvent\n .eventDescriptor as DigitDecompositionEventDescriptorV0;\n\n return eventDescriptor;\n};\n\n/**\n * Build an orderoffer for ContractDescriptorV1\n *\n * @param {OracleAnnouncementV0} announcement oracle announcement\n * @param {bigint} totalCollateral total collateral in satoshis\n * @param {bigint} offerCollateral offer collateral in satoshis\n * 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contractInfo.contractDescriptor = contractDescriptor;\n contractInfo.oracleInfo = oracleInfo;\n\n const orderOffer = new OrderOfferV0();\n\n orderOffer.chainHash = chainHashFromNetwork(BitcoinNetworks[network]);\n orderOffer.contractInfo = contractInfo;\n orderOffer.offerCollateralSatoshis = offerCollateral;\n orderOffer.feeRatePerVb = feePerByte;\n orderOffer.cetLocktime = Math.floor(new Date().getTime() / 1000); // set to current time\n orderOffer.refundLocktime =\n announcement.oracleEvent.eventMaturityEpoch + 2419200; // 4 weeks after maturity\n\n return orderOffer;\n};\n\n/**\n * Builds an order offer for a covered call or short put\n *\n * @param {OracleAnnouncementV0} announcement oracle announcement\n * @param {number} contractSize contract size in satoshis\n * @param {number} strikePrice strike price of contract\n * @param {number} premium premium of contract in satoshis\n * @param {number | bigint} feePerByte sats/vbyte\n * @param {number} rounding rounding interval\n * @param {string} network bitcoin network type\n * @param {string} type call or put\n * @param {number} _totalCollateral total collateral in satoshis (applicable only for short put)\n * @returns {OrderOfferV0} Returns order offer\n */\nexport const buildOptionOrderOffer = (\n announcement: OracleAnnouncementV0,\n contractSize: Value,\n strikePrice: number,\n premium: Value,\n feePerByte: number | bigint,\n rounding: number,\n network: string,\n type: 'call' | 'put',\n direction: 'long' | 'short',\n _totalCollateral?: Value,\n): OrderOfferV0 => {\n const eventDescriptor = getDigitDecompositionEventDescriptor(announcement);\n\n let totalCollateral: bigint;\n let payoutFunctionInfo: {\n payoutFunction: PayoutFunctionV0;\n totalCollateral?: bigint;\n };\n\n const roundingIntervals = new RoundingIntervalsV0();\n const roundingMod = computeRoundingModulus(rounding, contractSize);\n\n if (direction === 'short') {\n if (type === 'call') {\n payoutFunctionInfo = CoveredCall.buildPayoutFunction(\n BigInt(strikePrice),\n contractSize.sats,\n eventDescriptor.base,\n eventDescriptor.nbDigits,\n );\n\n totalCollateral = payoutFunctionInfo.totalCollateral;\n roundingIntervals.intervals = [\n {\n beginInterval: BigInt(0),\n roundingMod: BigInt(1),\n },\n {\n beginInterval: BigInt(strikePrice),\n roundingMod,\n },\n ];\n } else {\n payoutFunctionInfo = ShortPut.buildPayoutFunction(\n BigInt(strikePrice),\n contractSize.sats,\n _totalCollateral.sats,\n eventDescriptor.base,\n eventDescriptor.nbDigits,\n );\n totalCollateral = _totalCollateral.sats;\n roundingIntervals.intervals = [\n {\n beginInterval: BigInt(0),\n roundingMod,\n },\n {\n beginInterval: BigInt(strikePrice),\n roundingMod: BigInt(1),\n },\n ];\n }\n } else {\n totalCollateral = _totalCollateral.sats;\n\n if (type === 'call') {\n payoutFunctionInfo = LongCall.buildPayoutFunction(\n BigInt(strikePrice),\n contractSize.sats,\n totalCollateral,\n eventDescriptor.base,\n eventDescriptor.nbDigits,\n );\n\n roundingIntervals.intervals = [\n {\n beginInterval: BigInt(0),\n roundingMod: BigInt(1),\n },\n {\n beginInterval: BigInt(strikePrice),\n roundingMod,\n },\n ];\n } else {\n payoutFunctionInfo = LongPut.buildPayoutFunction(\n BigInt(strikePrice),\n contractSize.sats,\n totalCollateral,\n eventDescriptor.base,\n eventDescriptor.nbDigits,\n );\n\n roundingIntervals.intervals = [\n {\n beginInterval: BigInt(0),\n roundingMod,\n },\n {\n beginInterval: BigInt(strikePrice),\n roundingMod: BigInt(1),\n },\n ];\n }\n }\n\n const payoutFunction = payoutFunctionInfo.payoutFunction;\n\n const offerCollateral =\n direction === 'short' ? totalCollateral - premium.sats : premium.sats;\n\n return buildOrderOffer(\n announcement,\n totalCollateral,\n offerCollateral,\n payoutFunction,\n roundingIntervals,\n BigInt(feePerByte),\n network,\n );\n};\n\n/**\n * Builds an order offer for a covered call\n *\n * @param {OracleAnnouncementV0} announcement oracle announcement\n * @param {number} contractSize contract size in satoshis\n * @param {number} strikePrice strike price of contract\n * @param {number} premium premium of contract in satoshis\n * @param {number} feePerByte sats/vbyte\n * @param {number} rounding rounding interval\n * @param {string} network bitcoin network type\n * @returns {OrderOfferV0} Returns order offer\n */\nexport const buildCoveredCallOrderOffer = (\n announcement: OracleAnnouncementV0,\n contractSize: Value,\n strikePrice: number,\n premium: Value,\n feePerByte: number,\n rounding: number,\n network: string,\n): OrderOfferV0 => {\n return buildOptionOrderOffer(\n announcement,\n contractSize,\n strikePrice,\n premium,\n feePerByte,\n rounding,\n network,\n 'call',\n 'short',\n );\n};\n\n/**\n * Builds an order offer for a short put\n *\n * @param {OracleAnnouncementV0} announcement oracle announcement\n * @param {number} contractSize contract size in satoshis\n * @param {number} strikePrice strike price of contract\n * @param {number} totalCollateral total collateral in satoshis\n * @param {number} premium premium of contract in satoshis\n * @param {number} feePerByte sats/vbyte\n * @param {number} rounding rounding interval\n * @param {string} network bitcoin network type\n * @returns {OrderOfferV0} Returns order offer\n */\nexport const buildShortPutOrderOffer = (\n announcement: OracleAnnouncementV0,\n contractSize: Value,\n strikePrice: number,\n totalCollateral: Value,\n premium: Value,\n feePerByte: number,\n rounding: number,\n network: string,\n): OrderOfferV0 => {\n return buildOptionOrderOffer(\n announcement,\n contractSize,\n strikePrice,\n premium,\n feePerByte,\n rounding,\n network,\n 'put',\n 'short',\n totalCollateral,\n );\n};\n\n/**\n * Builds an order offer for a long call\n *\n * @param {OracleAnnouncementV0} announcement oracle announcement\n * @param {number} contractSize contract size in satoshis\n * @param {number} strikePrice strike price of contract\n * @param {number} maxGain maximum amount that can be gained (totalCollateral)\n * @param {number} premium premium of contract in satoshis\n * @param {number} feePerByte sats/vbyte\n * @param {number} rounding rounding interval\n * @param {string} network bitcoin network type\n * @returns {OrderOfferV0} Returns order offer\n */\nexport const buildLongCallOrderOffer = (\n announcement: OracleAnnouncementV0,\n contractSize: Value,\n strikePrice: number,\n maxGain: Value,\n premium: Value,\n feePerByte: number,\n rounding: number,\n network: string,\n): OrderOfferV0 => {\n return buildOptionOrderOffer(\n announcement,\n contractSize,\n strikePrice,\n premium,\n feePerByte,\n rounding,\n network,\n 'call',\n 'long',\n maxGain,\n );\n};\n\n/**\n * Builds an order offer for a long put\n *\n * @param {OracleAnnouncementV0} announcement oracle announcement\n * @param {number} contractSize contract size in satoshis\n * @param {number} strikePrice strike price of contract\n * @param {number} maxGain maximum amount that can be gained (totalCollateral)\n * @param {number} premium premium of contract in satoshis\n * @param {number} feePerByte sats/vbyte\n * @param {number} rounding rounding interval\n * @param {string} network bitcoin network type\n * @returns {OrderOfferV0} Returns order offer\n */\nexport const buildLongPutOrderOffer = (\n announcement: OracleAnnouncementV0,\n contractSize: Value,\n strikePrice: number,\n maxGain: Value,\n premium: Value,\n feePerByte: number,\n rounding: number,\n network: string,\n): OrderOfferV0 => {\n return buildOptionOrderOffer(\n announcement,\n contractSize,\n strikePrice,\n premium,\n feePerByte,\n rounding,\n network,\n 'put',\n 'long',\n maxGain,\n );\n};\n\n/**\n * Builds an order offer for a linear curve\n *\n * @param {OracleAnnouncementV0} announcement oracle announcement\n * @param {Value} offerCollateral offer collateral amount\n * @param {Value} minPayout minimum payout\n * @param {Value} maxPayout maximum payout (also total collateral)\n * @param {bigint} startOutcome oracle outcome (in bits or sats)\n * @param {bigint} endOutcome oracle outcome (in bits or sats)\n * @param {bigint} feePerByte sats/vbyte\n * @param {Value} rounding rounding mod for RoundingInterval\n * @param {BitcoinNetwork} network bitcoin, bitcoin_testnet or bitcoin_regtest\n * @param {DlcParty} [shiftForFees] shift for offerer, acceptor or neither (who should pay fees)\n * @param {Value} [fees] fees to shift\n * @returns {OrderOfferV0}\n */\nexport const buildLinearOrderOffer = (\n announcement: OracleAnnouncementV0,\n offerCollateral: Value,\n minPayout: Value,\n maxPayout: Value,\n startOutcome: bigint,\n endOutcome: bigint,\n feePerByte: bigint,\n roundingIntervals: RoundingIntervalsV0,\n network: BitcoinNetwork,\n shiftForFees: DlcParty = 'neither',\n fees: Value = Value.fromSats(0),\n): OrderOfferV0 => {\n if (maxPayout.lt(minPayout))\n throw Error('maxPayout must be greater than minPayout');\n if (endOutcome < startOutcome)\n throw Error('endOutcome must be greater than startOutcome');\n\n const eventDescriptor = getDigitDecompositionEventDescriptor(announcement);\n\n const totalCollateral = maxPayout.sats;\n\n const { payoutFunction } = LinearPayout.buildPayoutFunction(\n minPayout.sats,\n maxPayout.sats,\n startOutcome,\n endOutcome,\n eventDescriptor.base,\n eventDescriptor.nbDigits,\n );\n\n const orderOffer = buildOrderOffer(\n announcement,\n totalCollateral,\n offerCollateral.sats,\n payoutFunction,\n roundingIntervals,\n feePerByte,\n network.name,\n );\n\n const positionInfo = new OrderPositionInfoV0();\n positionInfo.shiftForFees = shiftForFees;\n positionInfo.fees = shiftForFees === 'neither' ? BigInt(0) : fees.sats;\n orderOffer.positionInfo = positionInfo;\n\n return orderOffer;\n};\n\n/**\n * Builds a custom strategy order offer\n *\n * Calculates offer fees\n * calculates the minimum max gain\n * maxLoss and maxGain are normalized to 1 BTC contracts\n *\n * shiftForFees 'offeror' means 'offeror' pays network fees\n * shiftForFees 'acceptor' means 'acceptor' pays network fees\n *\n * numContracts refers to the number of DLCs in the funding transaction\n * if it's not a batch dlc funding transaction, then this is not relevant\n *\n * @param {OracleAnnouncementV0} announcement oracle announcement\n * @param {Value} contractSize contract size\n * @param {Value} normalizedMaxLoss maximum amount that can be lost based on 1 BTC contract\n * @param {Value} normalizedMaxGain maximum amount that can be gained based on 1 BTC contract\n * @param {bigint} feePerByte sats/vbyte\n * @param {Value} roundingIntervals rounding mod for RoundingInterval\n * @param {BitcoinNetwork} network bitcoin, bitcoin_testnet or bitcoin_regtest\n * @param {DlcParty} [shiftForFees] shift for offerer, acceptor or neither\n * @param {Value} [fees_] fees to shift\n * @param {Value} [collateral] collateral to use\n * @param {number} [numOfferInputs] number of inputs to use\n * @param {number} [numContracts] number of DLCs in the funding transaction\n *\n * @returns {OrderOfferV0}\n */\nexport const buildCustomStrategyOrderOffer = (\n announcement: OracleAnnouncementV0,\n contractSize: Value,\n normalizedMaxLoss: Value,\n normalizedMaxGain: Value,\n feePerByte: bigint,\n roundingIntervals: RoundingIntervalsV0,\n network: BitcoinNetwork,\n shiftForFees: DlcParty = 'neither',\n fees_: Value = Value.fromSats(0), // NOTE: fees should be divided before doing batch transaction\n collateral: Value = Value.fromSats(0),\n numOfferInputs = 1,\n numContracts = 1,\n skipValidation = false,\n): OrderOfferV0 => {\n if (contractSize.eq(Value.zero())) {\n throw Error('contractSize must be greater than 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contractSize.sats) / BigInt(1e8),\n BigInt(UNIT_MULTIPLIER[unit.toLowerCase()]),\n ),\n );\n const tempMaxGainForContractSize = Value.fromSats(\n roundUpToNearestMultiplier(\n (normalizedMaxGain.sats * contractSize.sats) / BigInt(1e8),\n BigInt(UNIT_MULTIPLIER[unit.toLowerCase()]),\n ),\n );\n\n const maxGainForContractSize = Value.zero();\n\n if (tempMaxGainForContractSize.lt(minMaxGainForContractSize)) {\n maxGainForContractSize.add(minMaxGainForContractSize);\n } else {\n maxGainForContractSize.add(tempMaxGainForContractSize);\n }\n\n const maxGainAdjusted = Value.fromSats(\n roundToNearestMultiplier(\n (maxGainForContractSize.sats * BigInt(1e8)) / contractSize.sats,\n BigInt(UNIT_MULTIPLIER[unit.toLowerCase()]),\n ),\n );\n\n const feesAdjusted = Value.fromSats(\n roundToNearestMultiplier(\n (fees.sats * BigInt(1e8)) / contractSize.sats,\n BigInt(UNIT_MULTIPLIER[unit.toLowerCase()]),\n ),\n );\n\n const minPayout = collateral.clone();\n if (minPayout.lt(maxLossForContractSize.addn(maxGainForContractSize))) {\n throw new Error(\n 'Subtraction would result in a negative value for minPayout.',\n );\n }\n minPayout.sub(maxLossForContractSize);\n minPayout.sub(maxGainForContractSize);\n const maxPayout = collateral.clone();\n\n const startOutcomeValue = Value.fromBitcoin(1);\n startOutcomeValue.sub(normalizedMaxLoss);\n const endOutcomeValue = Value.fromBitcoin(1);\n endOutcomeValue.add(maxGainAdjusted);\n\n if (shiftForFees === 'offeror') {\n startOutcomeValue.add(feesAdjusted);\n endOutcomeValue.add(feesAdjusted);\n } else if (shiftForFees === 'acceptor') {\n startOutcomeValue.sub(feesAdjusted);\n endOutcomeValue.sub(feesAdjusted);\n }\n\n const startOutcome =\n startOutcomeValue.sats / BigInt(UNIT_MULTIPLIER[unit.toLowerCase()]);\n const endOutcome =\n endOutcomeValue.sats / BigInt(UNIT_MULTIPLIER[unit.toLowerCase()]);\n\n const offerCollateral = collateral.clone();\n if (offerCollateral.lt(maxGainForContractSize)) {\n 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Date;\n}\n\nexport interface CsoInfoParams {\n normalizedMaxGain: Value; // Max Gain Relative to 1 BTC Contract\n normalizedMaxLoss: Value; // Max Loss Relative to 1 BTC Contract\n maxGainForContractSize: Value; // Max Gain Relative to Contract Size\n maxLossForContractSize: Value; // Max Loss Relative to Contract Size\n offerCollateral: Value; // Offer Collateral\n}\n\nconst ONE_BTC_CONTRACT = Value.fromBitcoin(1);\n\nexport type MaybeHasPositionInfo = {\n positionInfo?: OrderPositionInfo;\n};\n\n/**\n * getCsoInfoParamsFromContractInfo V0\n *\n * Old getCsoInfoParamsFromContractInfo implementation\n *\n * @param {Value} contractSize - The size of the contract in terms of value.\n * @param {Value} collateral - The collateral value put up for the contract.\n * @param {DlcParty} shiftForFees - Specifies which party ('offeror' or 'acceptor') will bear the fees, affecting the outcome values.\n * @param {Value} fees - The fees associated with the contract.\n * @param {string} unit - The unit of measurement for the contract outcomes (e.g., 'BTC').\n * @param {Value} startOutcomeValue - The starting outcome value for the contract.\n * @param {Value} endOutcomeValue - The ending outcome value for the contract.\n * @returns {CsoInfoParams} An object containing the calculated CSO parameters:\n * - normalizedMaxGain: Maximum gain relative to a 1 BTC contract.\n * - normalizedMaxLoss: Maximum loss relative to a 1 BTC contract.\n * - maxGainForContractSize: Maximum gain for the actual contract size.\n * - maxLossForContractSize: Maximum loss for the actual contract size.\n * - offerCollateral: The offer collateral value after adjustments.\n *\n * Note: This function calculates the adjusted fees incorrectly, using collateral instead of contract size. 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Value.fromSats(\n roundToNearestMultiplier(\n (fees.sats * defaultContractSize.sats) / collateral.sats, // WARNING: this should be contract size not collateral\n UNIT_MULTIPLIER[unit.toLowerCase()], // (use v1 if possible)\n ),\n )\n : Value.zero();\n\n if (shiftForFees === 'offeror') {\n startOutcomeValue.sub(shiftValue);\n endOutcomeValue.sub(shiftValue);\n } else if (shiftForFees === 'acceptor') {\n startOutcomeValue.add(shiftValue);\n endOutcomeValue.add(shiftValue);\n }\n\n const normalizedMaxGain = endOutcomeValue.clone();\n normalizedMaxGain.sub(ONE_BTC_CONTRACT);\n\n const normalizedMaxLoss = ONE_BTC_CONTRACT.clone();\n normalizedMaxLoss.sub(startOutcomeValue);\n\n const maxGainForContractSize = Value.fromBitcoin(\n new Decimal(normalizedMaxGain.bitcoin)\n .times(leverageMultiplier)\n .toDecimalPlaces(5)\n .toNumber(),\n );\n\n const maxLossForContractSize = Value.fromBitcoin(\n new Decimal(normalizedMaxLoss.bitcoin)\n .times(contractSize.bitcoin)\n .toDecimalPlaces(\n 8 - Math.log10(Number(UNIT_MULTIPLIER[unit.toLowerCase()])),\n )\n .toNumber(),\n );\n\n const offerCollateral = collateral.clone();\n offerCollateral.sub(\n Value.fromSats(\n (maxGainForContractSize.sats * collateral.sats) / BigInt(1e8),\n ),\n );\n\n return {\n normalizedMaxGain,\n normalizedMaxLoss,\n maxGainForContractSize,\n maxLossForContractSize,\n offerCollateral,\n };\n};\n\n/**\n * getCsoInfoParamsFromContractInfo V1\n *\n * Fixed getCsoInfoParamsFromContractInfo implementation\n *\n * @param {Value} contractSize - The size of the contract in terms of value.\n * @param {Value} collateral - The collateral value put up for the contract.\n * @param {DlcParty} shiftForFees - Specifies which party ('offeror' or 'acceptor') will bear the fees, affecting the outcome values.\n * @param {Value} fees - The fees associated with the contract.\n * @param {string} unit - The unit of measurement for the contract outcomes (e.g., 'BTC').\n * @param {Value} startOutcomeValue - The starting outcome value for the contract.\n * @param {Value} endOutcomeValue - The ending outcome value for the contract.\n * @returns {CsoInfoParams} An object containing the calculated CSO parameters:\n * - normalizedMaxGain: Maximum gain relative to a 1 BTC contract.\n * - normalizedMaxLoss: Maximum loss relative to a 1 BTC contract.\n * - maxGainForContractSize: Maximum gain for the actual contract size.\n * - maxLossForContractSize: Maximum loss for the actual contract size.\n * - offerCollateral: The offer collateral value after adjustments.\n *\n * This version improves upon the previous by correctly adjusting fees based on the contract size, leading to more accurate\n * calculations of CSO parameters.\n */\nexport const getCsoInfoParamsFromContractInfoV1 = (\n contractSize: Value,\n collateral: Value,\n shiftForFees: DlcParty,\n fees: Value,\n unit: string,\n startOutcomeValue: Value,\n endOutcomeValue: Value,\n): CsoInfoParams => {\n const feesAdjusted = Value.fromSats(\n roundToNearestMultiplier(\n (fees.sats * BigInt(1e8)) / contractSize.sats, // NOTE: this is done correctly using contractSize\n BigInt(UNIT_MULTIPLIER[unit.toLowerCase()]),\n ),\n );\n\n if (shiftForFees === 'offeror') {\n startOutcomeValue.sub(feesAdjusted);\n endOutcomeValue.sub(feesAdjusted);\n } else if (shiftForFees === 'acceptor') {\n startOutcomeValue.add(feesAdjusted);\n endOutcomeValue.add(feesAdjusted);\n }\n\n const normalizedMaxGain = endOutcomeValue.clone();\n normalizedMaxGain.sub(ONE_BTC_CONTRACT);\n\n const normalizedMaxLoss = ONE_BTC_CONTRACT.clone();\n normalizedMaxLoss.sub(startOutcomeValue);\n\n const maxGainForContractSize = Value.fromSats(\n roundUpToNearestMultiplier(\n (normalizedMaxGain.sats * contractSize.sats) / BigInt(1e8),\n BigInt(UNIT_MULTIPLIER[unit.toLowerCase()]),\n ),\n );\n\n const maxLossForContractSize = Value.fromSats(\n roundUpToNearestMultiplier(\n (normalizedMaxLoss.sats * contractSize.sats) / BigInt(1e8),\n BigInt(UNIT_MULTIPLIER[unit.toLowerCase()]),\n ),\n );\n\n const offerCollateral = collateral.clone();\n offerCollateral.sub(maxGainForContractSize);\n\n return {\n normalizedMaxGain,\n normalizedMaxLoss,\n maxGainForContractSize,\n maxLossForContractSize,\n offerCollateral,\n };\n};\n\n/**\n * Decode CsoInfo from a ContractInfo object. 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