1 files changed, 37 insertions, 5 deletions
diff --git a/src/script/standard.h b/src/script/standard.h
index 7619192264..fa07ea88c1 100644
--- a/src/script/standard.h
+++ b/src/script/standard.h
@@ -64,6 +64,7 @@ enum txnouttype
     TX_NULL_DATA, //!< unspendable OP_RETURN script that carries data
     TX_WITNESS_V0_SCRIPTHASH,
     TX_WITNESS_V0_KEYHASH,
+    TX_WITNESS_UNKNOWN, //!< Only for Witness versions not already defined above
 };
 
 class CNoDestination {
@@ -72,14 +73,45 @@ public:
     friend bool operator<(const CNoDestination &a, const CNoDestination &b) { return true; }
 };
 
+struct WitnessV0ScriptHash : public uint256 {};
+struct WitnessV0KeyHash : public uint160 {};
+
+//! CTxDestination subtype to encode any future Witness version
+struct WitnessUnknown
+{
+    unsigned int version;
+    unsigned int length;
+    unsigned char program[40];
+
+    friend bool operator==(const WitnessUnknown& w1, const WitnessUnknown& w2) {
+        if (w1.version != w2.version) return false;
+        if (w1.length != w2.length) return false;
+        return std::equal(w1.program, w1.program + w1.length, w2.program);
+    }
+
+    friend bool operator<(const WitnessUnknown& w1, const WitnessUnknown& w2) {
+        if (w1.version < w2.version) return true;
+        if (w1.version > w2.version) return false;
+        if (w1.length < w2.length) return true;
+        if (w1.length > w2.length) return false;
+        return std::lexicographical_compare(w1.program, w1.program + w1.length, w2.program, w2.program + w2.length);
+    }
+};
+
 /**
  * A txout script template with a specific destination. It is either:
  *  * CNoDestination: no destination set
- *  * CKeyID: TX_PUBKEYHASH destination
- *  * CScriptID: TX_SCRIPTHASH destination
- *  A CTxDestination is the internal data type encoded in a CBitcoinAddress
+ *  * CKeyID: TX_PUBKEYHASH destination (P2PKH)
+ *  * CScriptID: TX_SCRIPTHASH destination (P2SH)
+ *  * WitnessV0ScriptHash: TX_WITNESS_V0_SCRIPTHASH destination (P2WSH)
+ *  * WitnessV0KeyHash: TX_WITNESS_V0_KEYHASH destination (P2WPKH)
+ *  * WitnessUnknown: TX_WITNESS_UNKNOWN destination (P2W???)
+ *  A CTxDestination is the internal data type encoded in a bitcoin address
  */
-typedef boost::variant<CNoDestination, CKeyID, CScriptID> CTxDestination;
+typedef boost::variant<CNoDestination, CKeyID, CScriptID, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessUnknown> CTxDestination;
+
+/** Check whether a CTxDestination is a CNoDestination. */
+bool IsValidDestination(const CTxDestination& dest);
 
 /** Get the name of a txnouttype as a C string, or nullptr if unknown. */
 const char* GetTxnOutputType(txnouttype t);
@@ -101,7 +133,7 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::v
  * Parse a standard scriptPubKey for the destination address. Assigns result to
  * the addressRet parameter and returns true if successful. For multisig
  * scripts, instead use ExtractDestinations. Currently only works for P2PK,
- * P2PKH, and P2SH scripts.
+ * P2PKH, P2SH, P2WPKH, and P2WSH scripts.
  */
 bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);