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Narrow rules of what is considered a possible coinjoin #1961

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Jan 12, 2021
Merged

Narrow rules of what is considered a possible coinjoin #1961

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9 changes: 9 additions & 0 deletions wallet/mixing.go
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Original file line number Diff line number Diff line change
Expand Up @@ -329,8 +329,17 @@ func PossibleCoinJoin(tx *wire.MsgTx) (isMix bool, mixDenom int64, mixCount uint
numberOfInputs := len(tx.TxIn)

mixedOuts := make(map[int64]uint32)
scripts := make(map[string]int)
for _, o := range tx.TxOut {
scripts[string(o.PkScript)]++
if scripts[string(o.PkScript)] > 1 {
return false, 0, 0
}
val := o.Value
// Multiple zero valued outputs do not count as a coinjoin mix.
if val == 0 {
continue
}
mixedOuts[val]++
}

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3 changes: 3 additions & 0 deletions wallet/wallet.go
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Expand Up @@ -5230,6 +5230,9 @@ func (w *Wallet) getCoinjoinTxsSumbByAcct(ctx context.Context) (map[uint32]int,
_, tipHeight := w.txStore.MainChainTip(dbtx)
rangeFn := func(details []udb.TxDetails) (bool, error) {
for _, detail := range details {
if detail.TxType != stake.TxTypeRegular {
continue
}
isMixedTx, mixDenom, _ := PossibleCoinJoin(&detail.MsgTx)
if !isMixedTx {
continue
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