DEV-222: Changed type of TxOut.Value and util.Amount to uin64 (#108)

* [DEV-222] Changed type of TxOut.Value and util.Amount to uin64

* [DEV-222] Replaced math.MaxUint64 with 0

* [DEV-222] Fixed comment to reflect uint64 instead of int64

* [DEV-222] Fixed overflow comment

blockdag/dagio.go

@@ -555,7 +555,7 @@ func deserializeUTXOEntry(serialized []byte) (*UTXOEntry, error) {
 	}
 
 	entry := &UTXOEntry{
-		amount:      int64(amount),
+		amount:      amount,
 		pkScript:    pkScript,
 		blockHeight: blockHeight,
 		packedFlags: 0,

blockdag/fullblocktests/generate.go

@@ -383,7 +383,7 @@ func additionalCoinbase(amount util.Amount) func(*wire.MsgBlock) {
 	return func(b *wire.MsgBlock) {
 		// Increase the first proof-of-work coinbase subsidy by the
 		// provided amount.
-		b.Transactions[0].TxOut[0].Value += int64(amount)
+		b.Transactions[0].TxOut[0].Value += uint64(amount)
 	}
 }
 
@@ -396,12 +396,12 @@ func additionalSpendFee(fee util.Amount) func(*wire.MsgBlock) {
 	return func(b *wire.MsgBlock) {
 		// Increase the fee of the spending transaction by reducing the
 		// amount paid.
-		if int64(fee) > b.Transactions[1].TxOut[0].Value {
+		if uint64(fee) > b.Transactions[1].TxOut[0].Value {
 			panic(fmt.Sprintf("additionalSpendFee: fee of %d "+
 				"exceeds available spend transaction value",
 				fee))
 		}
-		b.Transactions[1].TxOut[0].Value -= int64(fee)
+		b.Transactions[1].TxOut[0].Value -= uint64(fee)
 	}
 }
 
@@ -441,7 +441,7 @@ func createSpendTx(spend *spendableOut, fee util.Amount) *wire.MsgTx {
 		Sequence:         wire.MaxTxInSequenceNum,
 		SignatureScript:  nil,
 	})
-	spendTx.AddTxOut(wire.NewTxOut(int64(spend.amount-fee),
+	spendTx.AddTxOut(wire.NewTxOut(uint64(spend.amount-fee),
 		opTrueScript))
 	spendTx.AddTxOut(wire.NewTxOut(0, uniqueOpReturnScript()))
 
@@ -487,7 +487,7 @@ func (g *testGenerator) nextBlock(blockName string, spend *spendableOut, mungers
 		// Create the transaction with a fee of 1 atom for the
 		// miner and increase the coinbase subsidy accordingly.
 		fee := util.Amount(1)
-		coinbaseTx.TxOut[0].Value += int64(fee)
+		coinbaseTx.TxOut[0].Value += uint64(fee)
 
 		// Create a transaction that spends from the provided spendable
 		// output and includes an additional unique OP_RETURN output to
@@ -1695,7 +1695,7 @@ func Generate(includeLargeReorg bool) (tests [][]TestInstance, err error) {
 	//                 \-> b59(17)
 	g.setTip("b57")
 	g.nextBlock("b59", outs[17], func(b *wire.MsgBlock) {
-		b.Transactions[1].TxOut[0].Value = int64(outs[17].amount) + 1
+		b.Transactions[1].TxOut[0].Value = uint64(outs[17].amount) + 1
 	})
 	rejected(blockdag.ErrSpendTooHigh)
 
@@ -1967,7 +1967,7 @@ func Generate(includeLargeReorg bool) (tests [][]TestInstance, err error) {
 		// Add 4 outputs to the spending transaction that are spent
 		// below.
 		const numAdditionalOutputs = 4
-		const zeroCoin = int64(0)
+		const zeroCoin = uint64(0)
 		spendTx := b.Transactions[1]
 		for i := 0; i < numAdditionalOutputs; i++ {
 			spendTx.AddTxOut(wire.NewTxOut(zeroCoin, opTrueScript))
@@ -2032,7 +2032,7 @@ func Generate(includeLargeReorg bool) (tests [][]TestInstance, err error) {
 	g.setTip("b79")
 	g.nextBlock("b81", outs[27], func(b *wire.MsgBlock) {
 		const numAdditionalOutputs = 4
-		const zeroCoin = int64(0)
+		const zeroCoin = uint64(0)
 		spendTx := b.Transactions[1]
 		for i := 0; i < numAdditionalOutputs; i++ {
 			opRetScript := uniqueOpReturnScript()

blockdag/utxoset.go

@@ -20,7 +20,7 @@ type UTXOEntry struct {
 	// specifically crafted to result in minimal padding.  There will be a
 	// lot of these in memory, so a few extra bytes of padding adds up.
 
-	amount      int64
+	amount      uint64
 	pkScript    []byte // The public key script for the output.
 	blockHeight int32  // Height of block containing tx.
 
@@ -43,7 +43,7 @@ func (entry *UTXOEntry) BlockHeight() int32 {
 }
 
 // Amount returns the amount of the output.
-func (entry *UTXOEntry) Amount() int64 {
+func (entry *UTXOEntry) Amount() uint64 {
 	return entry.amount
 }
 

blockdag/utxoset_test.go

@@ -822,8 +822,8 @@ func createCoinbaseTx(blockHeight int32, numOutputs uint32) (*wire.MsgTx, error)
 		Sequence:        wire.MaxTxInSequenceNum,
 	})
 	totalInput := CalcBlockSubsidy(blockHeight, &dagconfig.MainNetParams)
-	amountPerOutput := totalInput / int64(numOutputs)
-	remainder := totalInput - amountPerOutput*int64(numOutputs)
+	amountPerOutput := totalInput / uint64(numOutputs)
+	remainder := totalInput - amountPerOutput*uint64(numOutputs)
 	for i := uint32(0); i < numOutputs; i++ {
 		// Ensure the final output accounts for any remainder that might
 		// be left from splitting the input amount.
@@ -861,7 +861,7 @@ func TestApplyUTXOChanges(t *testing.T) {
 	})
 	chainedTx.AddTxOut(&wire.TxOut{
 		PkScript: OpTrueScript,
-		Value:    int64(1),
+		Value:    uint64(1),
 	})
 
 	//Fake block header
@@ -891,7 +891,7 @@ func TestApplyUTXOChanges(t *testing.T) {
 	})
 	nonChainedTx.AddTxOut(&wire.TxOut{
 		PkScript: OpTrueScript,
-		Value:    int64(1),
+		Value:    uint64(1),
 	})
 
 	msgBlock2 := &wire.MsgBlock{
@@ -930,7 +930,7 @@ func TestDiffFromTx(t *testing.T) {
 	})
 	tx.AddTxOut(&wire.TxOut{
 		PkScript: OpTrueScript,
-		Value:    int64(1),
+		Value:    uint64(1),
 	})
 	diff, err := fus.diffFromTx(tx, node)
 	if err != nil {
@@ -957,7 +957,7 @@ func TestDiffFromTx(t *testing.T) {
 	})
 	invalidTx.AddTxOut(&wire.TxOut{
 		PkScript: OpTrueScript,
-		Value:    int64(1),
+		Value:    uint64(1),
 	})
 	_, err = fus.diffFromTx(invalidTx, node)
 	if err == nil {

blockdag/validate.go

@@ -162,7 +162,7 @@ func IsFinalizedTransaction(tx *util.Tx, blockHeight int32, blockTime time.Time)
 //
 // At the target block generation rate for the main network, this is
 // approximately every 4 years.
-func CalcBlockSubsidy(height int32, dagParams *dagconfig.Params) int64 {
+func CalcBlockSubsidy(height int32, dagParams *dagconfig.Params) uint64 {
 	if dagParams.SubsidyReductionInterval == 0 {
 		return baseSubsidy
 	}
@@ -200,7 +200,7 @@ func CheckTransactionSanity(tx *util.Tx) error {
 	// restrictions.  All amounts in a transaction are in a unit value known
 	// as a satoshi.  One bitcoin is a quantity of satoshi as defined by the
 	// SatoshiPerBitcoin constant.
-	var totalSatoshi int64
+	var totalSatoshi uint64
 	for _, txOut := range msgTx.TxOut {
 		satoshi := txOut.Value
 		if satoshi < 0 {
@@ -215,16 +215,17 @@ func CheckTransactionSanity(tx *util.Tx) error {
 			return ruleError(ErrBadTxOutValue, str)
 		}
 
-		// Two's complement int64 overflow guarantees that any overflow
-		// is detected and reported.  This is impossible for Bitcoin, but
-		// perhaps possible if an alt increases the total money supply.
-		totalSatoshi += satoshi
-		if totalSatoshi < 0 {
+		// Binary arithmetic guarantees that any overflow is detected and reported.
+		// This is impossible for Bitcoin, but perhaps possible if an alt increases
+		// the total money supply.
+		newTotalSatoshi := totalSatoshi + satoshi
+		if newTotalSatoshi < totalSatoshi {
 			str := fmt.Sprintf("total value of all transaction "+
 				"outputs exceeds max allowed value of %v",
 				util.MaxSatoshi)
 			return ruleError(ErrBadTxOutValue, str)
 		}
+		totalSatoshi = newTotalSatoshi
 		if totalSatoshi > util.MaxSatoshi {
 			str := fmt.Sprintf("total value of all transaction "+
 				"outputs is %v which is higher than max "+
@@ -815,14 +816,14 @@ func (dag *BlockDAG) ensureNoDuplicateTx(node *blockNode, block *util.Block) err
 //
 // NOTE: The transaction MUST have already been sanity checked with the
 // CheckTransactionSanity function prior to calling this function.
-func CheckTransactionInputs(tx *util.Tx, txHeight int32, utxoSet UTXOSet, dagParams *dagconfig.Params) (int64, error) {
+func CheckTransactionInputs(tx *util.Tx, txHeight int32, utxoSet UTXOSet, dagParams *dagconfig.Params) (uint64, error) {
 	// Coinbase transactions have no inputs.
 	if IsCoinBase(tx) {
 		return 0, nil
 	}
 
 	txHash := tx.Hash()
-	var totalSatoshiIn int64
+	var totalSatoshiIn uint64
 	for txInIndex, txIn := range tx.MsgTx().TxIn {
 		// Ensure the referenced input transaction is available.
 		entry, ok := utxoSet.Get(txIn.PreviousOutPoint)
@@ -858,11 +859,6 @@ func CheckTransactionInputs(tx *util.Tx, txHeight int32, utxoSet UTXOSet, dagPar
 		// bitcoin is a quantity of satoshi as defined by the
 		// SatoshiPerBitcoin constant.
 		originTxSatoshi := entry.Amount()
-		if originTxSatoshi < 0 {
-			str := fmt.Sprintf("transaction output has negative "+
-				"value of %v", util.Amount(originTxSatoshi))
-			return 0, ruleError(ErrBadTxOutValue, str)
-		}
 		if originTxSatoshi > util.MaxSatoshi {
 			str := fmt.Sprintf("transaction output value of %v is "+
 				"higher than max allowed value of %v",
@@ -889,7 +885,7 @@ func CheckTransactionInputs(tx *util.Tx, txHeight int32, utxoSet UTXOSet, dagPar
 	// Calculate the total output amount for this transaction.  It is safe
 	// to ignore overflow and out of range errors here because those error
 	// conditions would have already been caught by checkTransactionSanity.
-	var totalSatoshiOut int64
+	var totalSatoshiOut uint64
 	for _, txOut := range tx.MsgTx().TxOut {
 		totalSatoshiOut += txOut.Value
 	}
@@ -990,7 +986,7 @@ func (dag *BlockDAG) checkConnectBlock(node *blockNode, block *util.Block) error
 	// still relatively cheap as compared to running the scripts) checks
 	// against all the inputs when the signature operations are out of
 	// bounds.
-	var totalFees int64
+	var totalFees uint64
 	for _, tx := range transactions {
 		txFee, err := CheckTransactionInputs(tx, node.height, dag.virtual.utxoSet,
 			dag.dagParams)
@@ -1013,7 +1009,7 @@ func (dag *BlockDAG) checkConnectBlock(node *blockNode, block *util.Block) error
 	// mining the block.  It is safe to ignore overflow and out of range
 	// errors here because those error conditions would have already been
 	// caught by checkTransactionSanity.
-	var totalSatoshiOut int64
+	var totalSatoshiOut uint64
 	for _, txOut := range transactions[0].MsgTx().TxOut {
 		totalSatoshiOut += txOut.Value
 	}

btcjson/dagsvrresults.go

@@ -118,7 +118,7 @@ type GetBlockTemplateResultTx struct {
 	Data    string  `json:"data"`
 	Hash    string  `json:"hash"`
 	Depends []int64 `json:"depends"`
-	Fee     int64   `json:"fee"`
+	Fee     uint64  `json:"fee"`
 	SigOps  int64   `json:"sigops"`
 }
 
@@ -143,7 +143,7 @@ type GetBlockTemplateResult struct {
 	Version        int32                      `json:"version"`
 	CoinbaseAux    *GetBlockTemplateResultAux `json:"coinbaseaux,omitempty"`
 	CoinbaseTxn    *GetBlockTemplateResultTx  `json:"coinbasetxn,omitempty"`
-	CoinbaseValue  *int64                     `json:"coinbasevalue,omitempty"`
+	CoinbaseValue  *uint64                    `json:"coinbasevalue,omitempty"`
 	WorkID         string                     `json:"workid,omitempty"`
 
 	// Optional long polling from BIP 0022.

integration/rpctest/memwallet.go

@@ -16,9 +16,9 @@ import (
 	"github.com/daglabs/btcd/dagconfig/daghash"
 	"github.com/daglabs/btcd/rpcclient"
 	"github.com/daglabs/btcd/txscript"
-	"github.com/daglabs/btcd/wire"
 	"github.com/daglabs/btcd/util"
 	"github.com/daglabs/btcd/util/hdkeychain"
+	"github.com/daglabs/btcd/wire"
 )
 
 var (
@@ -428,7 +428,7 @@ func (m *memWallet) fundTx(tx *wire.MsgTx, amt util.Amount, feeRate util.Amount)
 				return err
 			}
 			changeOutput := &wire.TxOut{
-				Value:    int64(changeVal),
+				Value:    uint64(changeVal),
 				PkScript: pkScript,
 			}
 			tx.AddTxOut(changeOutput)

mempool/estimatefee.go

@@ -78,7 +78,7 @@ func (rate SatoshiPerByte) ToBtcPerKb() BtcPerKilobyte {
 func (rate SatoshiPerByte) Fee(size uint32) util.Amount {
 	// If our rate is the error value, return that.
 	if rate == SatoshiPerByte(-1) {
-		return util.Amount(-1)
+		return math.MaxUint64
 	}
 
 	return util.Amount(float64(rate) * float64(size))

mempool/estimatefee_test.go

@@ -11,8 +11,8 @@ import (
 
 	"github.com/daglabs/btcd/dagconfig/daghash"
 	"github.com/daglabs/btcd/mining"
-	"github.com/daglabs/btcd/wire"
 	"github.com/daglabs/btcd/util"
+	"github.com/daglabs/btcd/wire"
 )
 
 // newTestFeeEstimator creates a feeEstimator with some different parameters
@@ -54,7 +54,7 @@ func (eft *estimateFeeTester) testTx(fee util.Amount) *TxDesc {
 				Version: eft.version,
 			}),
 			Height: eft.height,
-			Fee:    int64(fee),
+			Fee:    uint64(fee),
 		},
 		StartingPriority: 0,
 	}

mempool/mempool.go

@@ -540,7 +540,7 @@ func (mp *TxPool) RemoveDoubleSpends(tx *util.Tx) {
 // helper for maybeAcceptTransaction.
 //
 // This function MUST be called with the mempool lock held (for writes).
-func (mp *TxPool) addTransaction(tx *util.Tx, height int32, fee int64) *TxDesc {
+func (mp *TxPool) addTransaction(tx *util.Tx, height int32, fee uint64) *TxDesc {
 	mp.cfg.DAG.UTXORLock()
 	defer mp.cfg.DAG.UTXORUnlock()
 	// Add the transaction to the pool and mark the referenced outpoints
@@ -551,7 +551,7 @@ func (mp *TxPool) addTransaction(tx *util.Tx, height int32, fee int64) *TxDesc {
 			Added:    time.Now(),
 			Height:   height,
 			Fee:      fee,
-			FeePerKB: fee * 1000 / int64(tx.MsgTx().SerializeSize()),
+			FeePerKB: fee * 1000 / uint64(tx.MsgTx().SerializeSize()),
 		},
 		StartingPriority: mining.CalcPriority(tx.MsgTx(), mp.mpUTXOSet, height),
 	}
@@ -816,8 +816,8 @@ func (mp *TxPool) maybeAcceptTransaction(tx *util.Tx, isNew, rateLimit, rejectDu
 	// transaction does not exceeed 1000 less than the reserved space for
 	// high-priority transactions, don't require a fee for it.
 	serializedSize := int64(tx.MsgTx().SerializeSize())
-	minFee := calcMinRequiredTxRelayFee(serializedSize,
-		mp.cfg.Policy.MinRelayTxFee)
+	minFee := uint64(calcMinRequiredTxRelayFee(serializedSize,
+		mp.cfg.Policy.MinRelayTxFee))
 	if serializedSize >= (DefaultBlockPrioritySize-1000) && txFee < minFee {
 		str := fmt.Sprintf("transaction %v has %d fees which is under "+
 			"the required amount of %d", txHash, txFee,

mempool/mempool_test.go

@@ -134,8 +134,8 @@ func (p *poolHarness) CreateCoinbaseTx(blockHeight int32, numOutputs uint32) (*u
 		Sequence:        wire.MaxTxInSequenceNum,
 	})
 	totalInput := blockdag.CalcBlockSubsidy(blockHeight, p.chainParams)
-	amountPerOutput := totalInput / int64(numOutputs)
-	remainder := totalInput - amountPerOutput*int64(numOutputs)
+	amountPerOutput := totalInput / uint64(numOutputs)
+	remainder := totalInput - amountPerOutput*uint64(numOutputs)
 	for i := uint32(0); i < numOutputs; i++ {
 		// Ensure the final output accounts for any remainder that might
 		// be left from splitting the input amount.
@@ -163,8 +163,8 @@ func (p *poolHarness) CreateSignedTx(inputs []spendableOutpoint, numOutputs uint
 	for _, input := range inputs {
 		totalInput += input.amount
 	}
-	amountPerOutput := int64(totalInput) / int64(numOutputs)
-	remainder := int64(totalInput) - amountPerOutput*int64(numOutputs)
+	amountPerOutput := uint64(totalInput) / uint64(numOutputs)
+	remainder := uint64(totalInput) - amountPerOutput*uint64(numOutputs)
 
 	tx := wire.NewMsgTx(wire.TxVersion)
 	for _, input := range inputs {
@@ -220,7 +220,7 @@ func (p *poolHarness) CreateTxChain(firstOutput spendableOutpoint, numTxns uint3
 		})
 		tx.AddTxOut(&wire.TxOut{
 			PkScript: p.payScript,
-			Value:    int64(spendableAmount),
+			Value:    uint64(spendableAmount),
 		})
 
 		// Sign the new transaction.
@@ -362,14 +362,14 @@ func testPoolMembership(tc *testContext, tx *util.Tx, inOrphanPool, inTxPool boo
 	}
 }
 
-func (p *poolHarness) createTx(outpoint spendableOutpoint, fee int64, numOutputs int64) (*util.Tx, error) {
+func (p *poolHarness) createTx(outpoint spendableOutpoint, fee uint64, numOutputs int64) (*util.Tx, error) {
 	tx := wire.NewMsgTx(wire.TxVersion)
 	tx.AddTxIn(&wire.TxIn{
 		PreviousOutPoint: outpoint.outPoint,
 		SignatureScript:  nil,
 		Sequence:         wire.MaxTxInSequenceNum,
 	})
-	amountPerOutput := (int64(outpoint.amount) - fee) / numOutputs
+	amountPerOutput := (uint64(outpoint.amount) - fee) / uint64(numOutputs)
 	for i := int64(0); i < numOutputs; i++ {
 		tx.AddTxOut(&wire.TxOut{
 			PkScript: p.payScript,

mempool/policy.go

@@ -235,7 +235,7 @@ func isDust(txOut *wire.TxOut, minRelayTxFee util.Amount) bool {
 	//
 	// The following is equivalent to (value/totalSize) * (1/3) * 1000
 	// without needing to do floating point math.
-	return txOut.Value*1000/(3*int64(totalSize)) < int64(minRelayTxFee)
+	return txOut.Value*1000/(3*uint64(totalSize)) < uint64(minRelayTxFee)
 }
 
 // checkTransactionStandard performs a series of checks on a transaction to

mining/mining.go

@@ -46,10 +46,10 @@ type TxDesc struct {
 	Height int32
 
 	// Fee is the total fee the transaction associated with the entry pays.
-	Fee int64
+	Fee uint64
 
 	// FeePerKB is the fee the transaction pays in Satoshi per 1000 bytes.
-	FeePerKB int64
+	FeePerKB uint64
 }
 
 // TxSource represents a source of transactions to consider for inclusion in
@@ -76,9 +76,9 @@ type TxSource interface {
 // which have not been mined into a block yet.
 type txPrioItem struct {
 	tx       *util.Tx
-	fee      int64
+	fee      uint64
 	priority float64
-	feePerKB int64
+	feePerKB uint64
 
 	// dependsOn holds a map of transaction hashes which this one depends
 	// on.  It will only be set when the transaction references other
@@ -195,7 +195,7 @@ type BlockTemplate struct {
 	// template pays in base units.  Since the first transaction is the
 	// coinbase, the first entry (offset 0) will contain the negative of the
 	// sum of the fees of all other transactions.
-	Fees []int64
+	Fees []uint64
 
 	// SigOpCounts contains the number of signature operations each
 	// transaction in the generated template performs.
@@ -455,9 +455,9 @@ func (g *BlkTmplGenerator) NewBlockTemplate(payToAddress util.Address) (*BlockTe
 	// a transaction as it is selected for inclusion in the final block.
 	// However, since the total fees aren't known yet, use a dummy value for
 	// the coinbase fee which will be updated later.
-	txFees := make([]int64, 0, len(sourceTxns))
+	txFees := make([]uint64, 0, len(sourceTxns))
 	txSigOpCounts := make([]int64, 0, len(sourceTxns))
-	txFees = append(txFees, -1) // Updated once known
+	txFees = append(txFees, 0) // Updated once known
 	txSigOpCounts = append(txSigOpCounts, numCoinbaseSigOps)
 
 	log.Debugf("Considering %d transactions for inclusion to new block",
@@ -541,7 +541,7 @@ mempoolLoop:
 	// transaction.
 	blockSize := blockHeaderOverhead + uint32(coinbaseTx.MsgTx().SerializeSize())
 	blockSigOps := numCoinbaseSigOps
-	totalFees := int64(0)
+	totalFees := uint64(0)
 
 	// Choose which transactions make it into the block.
 	for priorityQueue.Len() > 0 {
@@ -595,7 +595,7 @@ mempoolLoop:
 		// Skip free transactions once the block is larger than the
 		// minimum block size.
 		if sortedByFee &&
-			prioItem.feePerKB < int64(g.policy.TxMinFreeFee) &&
+			prioItem.feePerKB < uint64(g.policy.TxMinFreeFee) &&
 			blockPlusTxSize >= g.policy.BlockMinSize {
 
 			log.Tracef("Skipping tx %s with feePerKB %.2f "+

mining/mining_test.go

@@ -43,7 +43,7 @@ func TestTxFeePrioHeap(t *testing.T) {
 	prng := rand.New(rand.NewSource(randSeed))
 	for i := 0; i < 1000; i++ {
 		testItems = append(testItems, &txPrioItem{
-			feePerKB: int64(prng.Float64() * util.SatoshiPerBitcoin),
+			feePerKB: uint64(prng.Float64() * util.SatoshiPerBitcoin),
 			priority: prng.Float64() * 100,
 		})
 	}

mining/policy.go

@@ -75,7 +75,7 @@ func calcInputValueAge(tx *wire.MsgTx, utxoSet blockdag.UTXOSet, nextBlockHeight
 
 			// Sum the input value times age.
 			inputValue := entry.Amount()
-			totalInputAge += float64(inputValue * int64(inputAge))
+			totalInputAge += float64(inputValue * uint64(inputAge))
 		}
 	}
 

mining/policy_test.go

@@ -72,7 +72,7 @@ func createTxIn(originTx *wire.MsgTx, outputIndex uint32) *wire.TxIn {
 	return wire.NewTxIn(prevOut, nil)
 }
 
-func createTransaction(value int64, originTx *wire.MsgTx, originTxoutputIndex uint32, sigScript []byte) (*wire.MsgTx, error) {
+func createTransaction(value uint64, originTx *wire.MsgTx, originTxoutputIndex uint32, sigScript []byte) (*wire.MsgTx, error) {
 	lookupKey := func(a util.Address) (*btcec.PrivateKey, bool, error) {
 		// Ordinarily this function would involve looking up the private
 		// key for the provided address, but since the only thing being

server/p2p/p2p.go

@@ -1562,7 +1562,7 @@ func (s *Server) handleRelayInvMsg(state *peerState, msg relayMsg) {
 
 			// Don't relay the transaction if the transaction fee-per-kb
 			// is less than the peer's feefilter.
-			feeFilter := atomic.LoadInt64(&sp.FeeFilterInt)
+			feeFilter := uint64(atomic.LoadInt64(&sp.FeeFilterInt))
 			if feeFilter > 0 && txD.FeePerKB < feeFilter {
 				return
 			}

server/rpc/rpcserver.go

@@ -613,7 +613,7 @@ func handleCreateRawTransaction(s *Server, cmd interface{}, closeChan <-chan str
 			return nil, internalRPCError(err.Error(), context)
 		}
 
-		txOut := wire.NewTxOut(int64(satoshi), pkScript)
+		txOut := wire.NewTxOut(uint64(satoshi), pkScript)
 		mtx.AddTxOut(txOut)
 	}
 
@@ -2544,7 +2544,7 @@ func handleGetTxOut(s *Server, cmd interface{}, closeChan <-chan struct{}) (inte
 	// from there, otherwise attempt to fetch from the block database.
 	var bestBlockHash string
 	var confirmations int32
-	var value int64
+	var value uint64
 	var pkScript []byte
 	var isCoinbase bool
 	includeMempool := true
@@ -4214,7 +4214,7 @@ func NewRPCServer(
 		gbtWorkState:           newGbtWorkState(cfg.TimeSource),
 		helpCacher:             newHelpCacher(),
 		requestProcessShutdown: make(chan struct{}),
-		quit:                   make(chan int),
+		quit: make(chan int),
 	}
 	if config.MainConfig().RPCUser != "" && config.MainConfig().RPCPass != "" {
 		login := config.MainConfig().RPCUser + ":" + config.MainConfig().RPCPass

server/rpc/rpcwebsocket.go

@@ -824,7 +824,7 @@ func (m *wsNotificationManager) notifyForNewTx(clients map[chan struct{}]*wsClie
 	txHashStr := tx.Hash().String()
 	mtx := tx.MsgTx()
 
-	var amount int64
+	var amount uint64
 	for _, txOut := range mtx.TxOut {
 		amount += txOut.Value
 	}

txscript/script.go

@@ -329,7 +329,7 @@ func calcSignatureHash(script []parsedOpcode, hashType SigHashType, tx *wire.Msg
 
 		// All but current output get zeroed out.
 		for i := 0; i < idx; i++ {
-			txCopy.TxOut[i].Value = -1
+			txCopy.TxOut[i].Value = 0
 			txCopy.TxOut[i].PkScript = nil
 		}
 

util/amount.go

@@ -51,7 +51,7 @@ func (u AmountUnit) String() string {
 
 // Amount represents the base bitcoin monetary unit (colloquially referred
 // to as a `Satoshi').  A single Amount is equal to 1e-8 of a bitcoin.
-type Amount int64
+type Amount uint64
 
 // round converts a floating point number, which may or may not be representable
 // as an integer, to the Amount integer type by rounding to the nearest integer.

util/amount_test.go

@@ -31,24 +31,12 @@ func TestAmountCreation(t *testing.T) {
 			valid:    true,
 			expected: MaxSatoshi,
 		},
-		{
-			name:     "min producible",
-			amount:   -21e6,
-			valid:    true,
-			expected: -MaxSatoshi,
-		},
 		{
 			name:     "exceeds max producible",
 			amount:   21e6 + 1e-8,
 			valid:    true,
 			expected: MaxSatoshi + 1,
 		},
-		{
-			name:     "exceeds min producible",
-			amount:   -21e6 - 1e-8,
-			valid:    true,
-			expected: -MaxSatoshi - 1,
-		},
 		{
 			name:     "one hundred",
 			amount:   100,
@@ -220,42 +208,6 @@ func TestAmountMulF64(t *testing.T) {
 			mul:  1.02,
 			res:  204e5, // 0.204 BTC
 		},
-		{
-			name: "Multiply 0.1 BTC by -2",
-			amt:  100e5, // 0.1 BTC
-			mul:  -2,
-			res:  -200e5, // -0.2 BTC
-		},
-		{
-			name: "Multiply 0.2 BTC by -0.02",
-			amt:  200e5, // 0.2 BTC
-			mul:  -1.02,
-			res:  -204e5, // -0.204 BTC
-		},
-		{
-			name: "Multiply -0.1 BTC by 2",
-			amt:  -100e5, // -0.1 BTC
-			mul:  2,
-			res:  -200e5, // -0.2 BTC
-		},
-		{
-			name: "Multiply -0.2 BTC by 0.02",
-			amt:  -200e5, // -0.2 BTC
-			mul:  1.02,
-			res:  -204e5, // -0.204 BTC
-		},
-		{
-			name: "Multiply -0.1 BTC by -2",
-			amt:  -100e5, // -0.1 BTC
-			mul:  -2,
-			res:  200e5, // 0.2 BTC
-		},
-		{
-			name: "Multiply -0.2 BTC by -0.02",
-			amt:  -200e5, // -0.2 BTC
-			mul:  -1.02,
-			res:  204e5, // 0.204 BTC
-		},
 		{
 			name: "Round down",
 			amt:  49, // 49 Satoshis

wire/msgtx.go

@@ -214,7 +214,7 @@ func NewTxIn(prevOut *OutPoint, signatureScript []byte) *TxIn {
 
 // TxOut defines a bitcoin transaction output.
 type TxOut struct {
-	Value    int64
+	Value    uint64
 	PkScript []byte
 }
 
@@ -228,7 +228,7 @@ func (t *TxOut) SerializeSize() int {
 
 // NewTxOut returns a new bitcoin transaction output with the provided
 // transaction value and public key script.
-func NewTxOut(value int64, pkScript []byte) *TxOut {
+func NewTxOut(value uint64, pkScript []byte) *TxOut {
 	return &TxOut{
 		Value:    value,
 		PkScript: pkScript,

wire/msgtx_test.go

@@ -79,7 +79,7 @@ func TestTx(t *testing.T) {
 	}
 
 	// Ensure we get the same transaction output back out.
-	txValue := int64(5000000000)
+	txValue := uint64(5000000000)
 	pkScript := []byte{
 		0x41, // OP_DATA_65
 		0x04, 0xd6, 0x4b, 0xdf, 0xd0, 0x9e, 0xb1, 0xc5,