// isNonstandardTransaction determines whether a transaction contains any
// scripts which are not one of the standard types.
func isNonstandardTransaction(tx *dcrutil.Tx) bool {
// Check all of the output public key scripts for non-standard scripts.
for _, txOut := range tx.MsgTx().TxOut {
scriptClass := txscript.GetScriptClass(txOut.Version, txOut.PkScript)
if scriptClass == txscript.NonStandardTy {
return true
}
}
return false
}
// TestScriptClass ensures all the scripts in scriptClassTests have the expected
// class.
func TestScriptClass(t *testing.T) {
t.Parallel()
for _, test := range scriptClassTests {
script := mustParseShortForm(test.script)
class := txscript.GetScriptClass(txscript.DefaultScriptVersion, script)
if class != test.class {
t.Errorf("%s: expected %s got %s", test.name,
test.class, class)
return
}
}
}
// maybeAddOutpoint potentially adds the passed outpoint to the bloom filter
// depending on the bloom update flags and the type of the passed public key
// script.
//
// This function MUST be called with the filter lock held.
func (bf *Filter) maybeAddOutpoint(pkScrVer uint16, pkScript []byte, outHash *chainhash.Hash, outIdx uint32, outTree int8) {
switch bf.msgFilterLoad.Flags {
case wire.BloomUpdateAll:
outpoint := wire.NewOutPoint(outHash, outIdx, outTree)
bf.addOutPoint(outpoint)
case wire.BloomUpdateP2PubkeyOnly:
class := txscript.GetScriptClass(pkScrVer, pkScript)
if class == txscript.PubKeyTy || class == txscript.MultiSigTy {
outpoint := wire.NewOutPoint(outHash, outIdx, outTree)
bf.addOutPoint(outpoint)
}
}
}
// IsDustOutput determines whether a transaction output is considered dust.
// Transactions with dust outputs are not standard and are rejected by mempools
// with default policies.
func IsDustOutput(output *wire.TxOut, relayFeePerKb dcrutil.Amount) bool {
// Unspendable outputs which solely carry data are not checked for dust.
if txscript.GetScriptClass(output.Version, output.PkScript) == txscript.NullDataTy {
return false
}
// All other unspendable outputs are considered dust.
if txscript.IsUnspendable(output.Value, output.PkScript) {
return true
}
return IsDustAmount(dcrutil.Amount(output.Value), len(output.PkScript),
relayFeePerKb)
}
// checkTransactionStandard performs a series of checks on a transaction to
// ensure it is a "standard" transaction. A standard transaction is one that
// conforms to several additional limiting cases over what is considered a
// "sane" transaction such as having a version in the supported range, being
// finalized, conforming to more stringent size constraints, having scripts
// of recognized forms, and not containing "dust" outputs (those that are
// so small it costs more to process them than they are worth).
func checkTransactionStandard(tx *dcrutil.Tx, txType stake.TxType, height int64,
timeSource blockchain.MedianTimeSource,
minRelayTxFee dcrutil.Amount) error {
// The transaction must be a currently supported version.
msgTx := tx.MsgTx()
if !wire.IsSupportedMsgTxVersion(msgTx) {
str := fmt.Sprintf("transaction version %d is not in the "+
"valid range of %d-%d", msgTx.Version, 1,
wire.TxVersion)
return txRuleError(wire.RejectNonstandard, str)
}
// The transaction must be finalized to be standard and therefore
// considered for inclusion in a block.
adjustedTime := timeSource.AdjustedTime()
if !blockchain.IsFinalizedTransaction(tx, height, adjustedTime) {
return txRuleError(wire.RejectNonstandard,
"transaction is not finalized")
}
// Since extremely large transactions with a lot of inputs can cost
// almost as much to process as the sender fees, limit the maximum
// size of a transaction. This also helps mitigate CPU exhaustion
// attacks.
serializedLen := msgTx.SerializeSize()
if serializedLen > maxStandardTxSize {
str := fmt.Sprintf("transaction size of %v is larger than max "+
"allowed size of %v", serializedLen, maxStandardTxSize)
return txRuleError(wire.RejectNonstandard, str)
}
for i, txIn := range msgTx.TxIn {
// Each transaction input signature script must not exceed the
// maximum size allowed for a standard transaction. See
// the comment on maxStandardSigScriptSize for more details.
sigScriptLen := len(txIn.SignatureScript)
if sigScriptLen > maxStandardSigScriptSize {
str := fmt.Sprintf("transaction input %d: signature "+
"script size of %d bytes is large than max "+
"allowed size of %d bytes", i, sigScriptLen,
maxStandardSigScriptSize)
return txRuleError(wire.RejectNonstandard, str)
}
// Each transaction input signature script must only contain
// opcodes which push data onto the stack.
if !txscript.IsPushOnlyScript(txIn.SignatureScript) {
str := fmt.Sprintf("transaction input %d: signature "+
"script is not push only", i)
return txRuleError(wire.RejectNonstandard, str)
}
}
// None of the output public key scripts can be a non-standard script or
// be "dust" (except when the script is a null data script).
numNullDataOutputs := 0
for i, txOut := range msgTx.TxOut {
scriptClass := txscript.GetScriptClass(txOut.Version, txOut.PkScript)
err := checkPkScriptStandard(txOut.Version, txOut.PkScript, scriptClass)
if err != nil {
// Attempt to extract a reject code from the error so
// it can be retained. When not possible, fall back to
// a non standard error.
rejectCode, found := extractRejectCode(err)
if !found {
rejectCode = wire.RejectNonstandard
}
str := fmt.Sprintf("transaction output %d: %v", i, err)
return txRuleError(rejectCode, str)
}
// Accumulate the number of outputs which only carry data. For
// all other script types, ensure the output value is not
// "dust".
if scriptClass == txscript.NullDataTy {
numNullDataOutputs++
} else if isDust(txOut, minRelayTxFee) &&
txType != stake.TxTypeSStx {
str := fmt.Sprintf("transaction output %d: payment "+
"of %d is dust", i, txOut.Value)
return txRuleError(wire.RejectDust, str)
}
}
// A standard transaction must not have more than one output script that
// only carries data. However, certain types of standard stake transactions
// are allowed to have multiple OP_RETURN outputs, so only throw an error here
// if the tx is TxTypeRegular.
if numNullDataOutputs > maxNullDataOutputs && txType == stake.TxTypeRegular {
str := "more than one transaction output in a nulldata script for a " +
"regular type tx"
return txRuleError(wire.RejectNonstandard, str)
}
return nil
}
// TestCheckPkScriptStandard tests the checkPkScriptStandard API.
func TestCheckPkScriptStandard(t *testing.T) {
var pubKeys [][]byte
for i := 0; i < 4; i++ {
pk := chainec.Secp256k1.NewPrivateKey(big.NewInt(int64(chainec.ECTypeSecp256k1)))
pubKeys = append(pubKeys, chainec.Secp256k1.NewPublicKey(pk.Public()).SerializeCompressed())
}
tests := []struct {
name string // test description.
script *txscript.ScriptBuilder
isStandard bool
}{
{
"key1 and key2",
txscript.NewScriptBuilder().AddOp(txscript.OP_2).
AddData(pubKeys[0]).AddData(pubKeys[1]).
AddOp(txscript.OP_2).AddOp(txscript.OP_CHECKMULTISIG),
true,
},
{
"key1 or key2",
txscript.NewScriptBuilder().AddOp(txscript.OP_1).
AddData(pubKeys[0]).AddData(pubKeys[1]).
AddOp(txscript.OP_2).AddOp(txscript.OP_CHECKMULTISIG),
true,
},
{
"escrow",
txscript.NewScriptBuilder().AddOp(txscript.OP_2).
AddData(pubKeys[0]).AddData(pubKeys[1]).
AddData(pubKeys[2]).
AddOp(txscript.OP_3).AddOp(txscript.OP_CHECKMULTISIG),
true,
},
{
"one of four",
txscript.NewScriptBuilder().AddOp(txscript.OP_1).
AddData(pubKeys[0]).AddData(pubKeys[1]).
AddData(pubKeys[2]).AddData(pubKeys[3]).
AddOp(txscript.OP_4).AddOp(txscript.OP_CHECKMULTISIG),
false,
},
{
"malformed1",
txscript.NewScriptBuilder().AddOp(txscript.OP_3).
AddData(pubKeys[0]).AddData(pubKeys[1]).
AddOp(txscript.OP_2).AddOp(txscript.OP_CHECKMULTISIG),
false,
},
{
"malformed2",
txscript.NewScriptBuilder().AddOp(txscript.OP_2).
AddData(pubKeys[0]).AddData(pubKeys[1]).
AddOp(txscript.OP_3).AddOp(txscript.OP_CHECKMULTISIG),
false,
},
{
"malformed3",
txscript.NewScriptBuilder().AddOp(txscript.OP_0).
AddData(pubKeys[0]).AddData(pubKeys[1]).
AddOp(txscript.OP_2).AddOp(txscript.OP_CHECKMULTISIG),
false,
},
{
"malformed4",
txscript.NewScriptBuilder().AddOp(txscript.OP_1).
AddData(pubKeys[0]).AddData(pubKeys[1]).
AddOp(txscript.OP_0).AddOp(txscript.OP_CHECKMULTISIG),
false,
},
{
"malformed5",
txscript.NewScriptBuilder().AddOp(txscript.OP_1).
AddData(pubKeys[0]).AddData(pubKeys[1]).
AddOp(txscript.OP_CHECKMULTISIG),
false,
},
{
"malformed6",
txscript.NewScriptBuilder().AddOp(txscript.OP_1).
AddData(pubKeys[0]).AddData(pubKeys[1]),
false,
},
}
for _, test := range tests {
script, err := test.script.Script()
if err != nil {
t.Fatalf("TestCheckPkScriptStandard test '%s' "+
"failed: %v", test.name, err)
continue
}
scriptClass := txscript.GetScriptClass(0, script)
got := checkPkScriptStandard(0, script, scriptClass)
if (test.isStandard && got != nil) ||
(!test.isStandard && got == nil) {
t.Fatalf("TestCheckPkScriptStandard test '%s' failed",
test.name)
return
}
}
}
// IsSSGen returns whether or not a transaction is an SSGen tx. It does some
// simple validation steps to make sure the number of inputs, number of
// outputs, and the input/output scripts are valid.
//
// This does NOT check to see if the subsidy is valid or whether or not the
// value of input[0] + subsidy = value of the outputs.
//
// SSGen transactions are specified as below.
// Inputs:
// Stakebase null input [index 0]
// SStx-tagged output [index 1]
//
// Outputs:
// OP_RETURN push of 40 bytes containing: [index 0]
// i. 32-byte block header of block being voted on.
// ii. 8-byte int of this block's height.
// OP_RETURN push of 2 bytes containing votebits [index 1]
// SSGen-tagged output to address from SStx-tagged output's tx index output 1
// [index 2]
// SSGen-tagged output to address from SStx-tagged output's tx index output 2
// [index 3]
// ...
// SSGen-tagged output to address from SStx-tagged output's tx index output
// MaxInputsPerSStx [index MaxOutputsPerSSgen - 1]
//
// The errors in this function can be ignored if you want to use it in to
// identify SSGen from a list of stake tx.
func IsSSGen(tx *wire.MsgTx) (bool, error) {
// Check to make sure there aren't too many inputs.
// CheckTransactionSanity already makes sure that number of inputs is
// greater than 0, so no need to check that.
if len(tx.TxIn) != NumInputsPerSSGen {
return false, stakeRuleError(ErrSSGenWrongNumInputs, "SSgen tx has an "+
"invalid number of inputs")
}
// Check to make sure there aren't too many outputs.
if len(tx.TxOut) > MaxOutputsPerSSGen {
return false, stakeRuleError(ErrSSGenTooManyOutputs, "SSgen tx has too "+
"many outputs")
}
// Check to make sure there are some outputs.
if len(tx.TxOut) == 0 {
return false, stakeRuleError(ErrSSGenNoOutputs, "SSgen tx no "+
"many outputs")
}
// Ensure that the first input is a stake base null input.
// Also checks to make sure that there aren't too many or too few inputs.
if !IsStakeBase(tx) {
return false, stakeRuleError(ErrSSGenNoStakebase, "SSGen tx did not "+
"include a stakebase in the zeroeth input position")
}
// Check to make sure that the output used as input came from TxTreeStake.
for i, txin := range tx.TxIn {
// Skip the stakebase
if i == 0 {
continue
}
if txin.PreviousOutPoint.Index != 0 {
errStr := fmt.Sprintf("SSGen used an invalid input idx (got %v, "+
"want 0)", txin.PreviousOutPoint.Index)
return false, stakeRuleError(ErrSSGenWrongIndex, errStr)
}
if txin.PreviousOutPoint.Tree != wire.TxTreeStake {
return false, stakeRuleError(ErrSSGenWrongTxTree, "SSGen used "+
"a non-stake input")
}
}
// Check to make sure that all output scripts are the default version.
for _, txOut := range tx.TxOut {
if txOut.Version != txscript.DefaultScriptVersion {
return false, stakeRuleError(ErrSSGenBadGenOuts, "invalid "+
"script version found in txOut")
}
}
// Ensure the number of outputs is equal to the number of inputs found in
// the original SStx + 2.
// TODO: Do this in validate, requires DB and valid chain.
// Ensure that the second input is an SStx tagged output.
// TODO: Do this in validate, as we don't want to actually lookup
// old tx here. This function is for more general sorting.
// Ensure that the first output is an OP_RETURN push.
zeroethOutputVersion := tx.TxOut[0].Version
zeroethOutputScript := tx.TxOut[0].PkScript
if txscript.GetScriptClass(zeroethOutputVersion, zeroethOutputScript) !=
txscript.NullDataTy {
return false, stakeRuleError(ErrSSGenNoReference, "First SSGen output "+
"should have been an OP_RETURN data push, but was not")
}
// Ensure that the first output is the correct size.
if len(zeroethOutputScript) != SSGenBlockReferenceOutSize {
return false, stakeRuleError(ErrSSGenBadReference, "First SSGen output "+
"should have been 43 bytes long, but was not")
}
// The OP_RETURN output script prefix for block referencing should
// conform to the standard.
zeroethOutputScriptBuffer := bytes.NewBuffer(zeroethOutputScript)
zeroethOutputScriptPrefix := zeroethOutputScriptBuffer.Next(2)
if !bytes.Equal(zeroethOutputScriptPrefix,
validSSGenReferenceOutPrefix) {
return false, stakeRuleError(ErrSSGenBadReference, "First SSGen output "+
"had an invalid prefix")
}
// Ensure that the block header hash given in the first 32 bytes of the
// OP_RETURN push is a valid block header and found in the main chain.
// TODO: This is validate level stuff, do this there.
// Ensure that the second output is an OP_RETURN push.
firstOutputVersion := tx.TxOut[1].Version
firstOutputScript := tx.TxOut[1].PkScript
if txscript.GetScriptClass(firstOutputVersion, firstOutputScript) !=
txscript.NullDataTy {
return false, stakeRuleError(ErrSSGenNoVotePush, "Second SSGen output "+
"should have been an OP_RETURN data push, but was not")
}
// The length of the output script should be between 4 and 77 bytes long.
if len(firstOutputScript) < SSGenVoteBitsOutputMinSize ||
len(firstOutputScript) > SSGenVoteBitsOutputMaxSize {
str := fmt.Sprintf("SSGen votebits output at output index 1 was a " +
"NullData (OP_RETURN) push of the wrong size")
return false, stakeRuleError(ErrSSGenBadVotePush, str)
}
// The OP_RETURN output script prefix for voting should conform to the
// standard.
firstOutputScriptBuffer := bytes.NewBuffer(firstOutputScript)
firstOutputScriptPrefix := firstOutputScriptBuffer.Next(2)
minPush := uint8(validSSGenVoteOutMinPrefix[1])
maxPush := uint8(validSSGenVoteOutMinPrefix[1]) +
(MaxSingleBytePushLength - minPush)
pushLen := uint8(firstOutputScriptPrefix[1])
pushLengthValid := (pushLen >= minPush) && (pushLen <= maxPush)
// The first byte should be OP_RETURN, while the second byte should be a
// valid push length.
if !(firstOutputScriptPrefix[0] == validSSGenVoteOutMinPrefix[0]) ||
!pushLengthValid {
return false, stakeRuleError(ErrSSGenBadVotePush, "Second SSGen output "+
"had an invalid prefix")
}
// Ensure that the tx height given in the last 8 bytes is StakeMaturity
// many blocks ahead of the block in which that SStx appears, otherwise
// this ticket has failed to mature and the SStx must be invalid.
// TODO: This is validate level stuff, do this there.
// Ensure that the remaining outputs are OP_SSGEN tagged.
for outTxIndex := 2; outTxIndex < len(tx.TxOut); outTxIndex++ {
scrVersion := tx.TxOut[outTxIndex].Version
rawScript := tx.TxOut[outTxIndex].PkScript
// The script should be a OP_SSGEN tagged output.
if txscript.GetScriptClass(scrVersion, rawScript) !=
txscript.StakeGenTy {
str := fmt.Sprintf("SSGen tx output at output index %d was not "+
"an OP_SSGEN tagged output", outTxIndex)
return false, stakeRuleError(ErrSSGenBadGenOuts, str)
}
}
return true, nil
}
// IsSStx returns whether or not a transaction is an SStx. It does some
// simple validation steps to make sure the number of inputs, number of
// outputs, and the input/output scripts are valid.
//
// SStx transactions are specified as below.
// Inputs:
// untagged output 1 [index 0]
// untagged output 2 [index 1]
// ...
// untagged output MaxInputsPerSStx [index MaxInputsPerSStx-1]
//
// Outputs:
// OP_SSTX tagged output [index 0]
// OP_RETURN push of input 1's address for reward receiving [index 1]
// OP_SSTXCHANGE tagged output for input 1 [index 2]
// OP_RETURN push of input 2's address for reward receiving [index 3]
// OP_SSTXCHANGE tagged output for input 2 [index 4]
// ...
// OP_RETURN push of input MaxInputsPerSStx's address for reward receiving
// [index (MaxInputsPerSStx*2)-2]
// OP_SSTXCHANGE tagged output [index (MaxInputsPerSStx*2)-1]
//
// The output OP_RETURN pushes should be of size 20 bytes (standard address).
//
// The errors in this function can be ignored if you want to use it in to
// identify SStx from a list of stake tx.
func IsSStx(tx *wire.MsgTx) (bool, error) {
// Check to make sure there aren't too many inputs.
// CheckTransactionSanity already makes sure that number of inputs is
// greater than 0, so no need to check that.
if len(tx.TxIn) > MaxInputsPerSStx {
return false, stakeRuleError(ErrSStxTooManyInputs, "SStx has too many "+
"inputs")
}
// Check to make sure there aren't too many outputs.
if len(tx.TxOut) > MaxOutputsPerSStx {
return false, stakeRuleError(ErrSStxTooManyOutputs, "SStx has too many "+
"outputs")
}
// Check to make sure there are some outputs.
if len(tx.TxOut) == 0 {
return false, stakeRuleError(ErrSStxNoOutputs, "SStx has no "+
"outputs")
}
// Check to make sure that all output scripts are the default version.
for idx, txOut := range tx.TxOut {
if txOut.Version != txscript.DefaultScriptVersion {
errStr := fmt.Sprintf("invalid script version found in "+
"txOut idx %v", idx)
return false, stakeRuleError(ErrSStxInvalidOutputs, errStr)
}
}
// Ensure that the first output is tagged OP_SSTX.
if txscript.GetScriptClass(tx.TxOut[0].Version, tx.TxOut[0].PkScript) !=
txscript.StakeSubmissionTy {
return false, stakeRuleError(ErrSStxInvalidOutputs, "First SStx output "+
"should have been OP_SSTX tagged, but it was not")
}
// Ensure that the number of outputs is equal to the number of inputs
// + 1.
if (len(tx.TxIn)*2 + 1) != len(tx.TxOut) {
return false, stakeRuleError(ErrSStxInOutProportions, "The number of "+
"inputs in the SStx tx was not the number of outputs/2 - 1")
}
// Ensure that the rest of the odd outputs are 28-byte OP_RETURN pushes that
// contain putative pubkeyhashes, and that the rest of the odd outputs are
// OP_SSTXCHANGE tagged.
for outTxIndex := 1; outTxIndex < len(tx.TxOut); outTxIndex++ {
scrVersion := tx.TxOut[outTxIndex].Version
rawScript := tx.TxOut[outTxIndex].PkScript
// Check change outputs.
if outTxIndex%2 == 0 {
if txscript.GetScriptClass(scrVersion, rawScript) !=
txscript.StakeSubChangeTy {
str := fmt.Sprintf("SStx output at output index %d was not "+
"an sstx change output", outTxIndex)
return false, stakeRuleError(ErrSStxInvalidOutputs, str)
}
continue
}
// Else (odd) check commitment outputs. The script should be a
// NullDataTy output.
if txscript.GetScriptClass(scrVersion, rawScript) !=
txscript.NullDataTy {
str := fmt.Sprintf("SStx output at output index %d was not "+
"a NullData (OP_RETURN) push", outTxIndex)
return false, stakeRuleError(ErrSStxInvalidOutputs, str)
}
// The length of the output script should be between 32 and 77 bytes long.
if len(rawScript) < SStxPKHMinOutSize ||
len(rawScript) > SStxPKHMaxOutSize {
str := fmt.Sprintf("SStx output at output index %d was a "+
"NullData (OP_RETURN) push of the wrong size", outTxIndex)
return false, stakeRuleError(ErrSStxInvalidOutputs, str)
}
// The OP_RETURN output script prefix should conform to the standard.
outputScriptBuffer := bytes.NewBuffer(rawScript)
outputScriptPrefix := outputScriptBuffer.Next(2)
minPush := uint8(validSStxAddressOutMinPrefix[1])
maxPush := uint8(validSStxAddressOutMinPrefix[1]) +
(MaxSingleBytePushLength - minPush)
pushLen := uint8(outputScriptPrefix[1])
pushLengthValid := (pushLen >= minPush) && (pushLen <= maxPush)
// The first byte should be OP_RETURN, while the second byte should be a
// valid push length.
if !(outputScriptPrefix[0] == validSStxAddressOutMinPrefix[0]) ||
!pushLengthValid {
errStr := fmt.Sprintf("sstx commitment at output idx %v had "+
"an invalid prefix", outTxIndex)
return false, stakeRuleError(ErrSStxInvalidOutputs,
errStr)
}
}
return true, nil
}
// IsSSRtx returns whether or not a transaction is an SSRtx. It does some
// simple validation steps to make sure the number of inputs, number of
// outputs, and the input/output scripts are valid.
//
// SSRtx transactions are specified as below.
// Inputs:
// SStx-tagged output [index 0]
//
// Outputs:
// SSGen-tagged output to address from SStx-tagged output's tx index output 1
// [index 0]
// SSGen-tagged output to address from SStx-tagged output's tx index output 2
// [index 1]
// ...
// SSGen-tagged output to address from SStx-tagged output's tx index output
// MaxInputsPerSStx [index MaxOutputsPerSSRtx - 1]
//
// The errors in this function can be ignored if you want to use it in to
// identify SSRtx from a list of stake tx.
func IsSSRtx(tx *wire.MsgTx) (bool, error) {
// Check to make sure there is the correct number of inputs.
// CheckTransactionSanity already makes sure that number of inputs is
// greater than 0, so no need to check that.
if len(tx.TxIn) != NumInputsPerSSRtx {
return false, stakeRuleError(ErrSSRtxWrongNumInputs, "SSRtx has an "+
" invalid number of inputs")
}
// Check to make sure there aren't too many outputs.
if len(tx.TxOut) > MaxOutputsPerSSRtx {
return false, stakeRuleError(ErrSSRtxTooManyOutputs, "SSRtx has too "+
"many outputs")
}
// Check to make sure there are some outputs.
if len(tx.TxOut) == 0 {
return false, stakeRuleError(ErrSSRtxNoOutputs, "SSRtx has no "+
"outputs")
}
// Check to make sure that all output scripts are the default version.
for _, txOut := range tx.TxOut {
if txOut.Version != txscript.DefaultScriptVersion {
return false, stakeRuleError(ErrSSRtxBadOuts, "invalid "+
"script version found in txOut")
}
}
// Check to make sure that the output used as input came from TxTreeStake.
for _, txin := range tx.TxIn {
if txin.PreviousOutPoint.Tree != wire.TxTreeStake {
return false, stakeRuleError(ErrSSRtxWrongTxTree, "SSRtx used "+
"a non-stake input")
}
}
// Ensure that the first input is an SStx tagged output.
// TODO: Do this in validate, needs a DB and chain.
// Ensure that the tx height given in the last 8 bytes is StakeMaturity
// many blocks ahead of the block in which that SStx appear, otherwise
// this ticket has failed to mature and the SStx must be invalid.
// TODO: Do this in validate, needs a DB and chain.
// Ensure that the outputs are OP_SSRTX tagged.
// Ensure that the tx height given in the last 8 bytes is StakeMaturity
// many blocks ahead of the block in which that SStx appear, otherwise
// this ticket has failed to mature and the SStx must be invalid.
// TODO: This is validate level stuff, do this there.
// Ensure that the outputs are OP_SSRTX tagged.
for outTxIndex := 0; outTxIndex < len(tx.TxOut); outTxIndex++ {
scrVersion := tx.TxOut[outTxIndex].Version
rawScript := tx.TxOut[outTxIndex].PkScript
// The script should be a OP_SSRTX tagged output.
if txscript.GetScriptClass(scrVersion, rawScript) !=
txscript.StakeRevocationTy {
str := fmt.Sprintf("SSRtx output at output index %d was not "+
"an OP_SSRTX tagged output", outTxIndex)
return false, stakeRuleError(ErrSSRtxBadOuts, str)
}
}
// Ensure the number of outputs is equal to the number of inputs found in
// the original SStx.
// TODO: Do this in validate, needs a DB and chain.
return true, nil
}