Add filter_spent to getsilentpaymentblockdata rpc

src/CMakeLists.txt

@@ -140,6 +140,7 @@ add_library(bitcoin_common STATIC EXCLUDE_FROM_ALL
   coins.cpp
   common/args.cpp
   common/bloom.cpp
+  common/bip352.cpp
   common/config.cpp
   common/init.cpp
   common/interfaces.cpp
@@ -236,6 +237,7 @@ add_library(bitcoin_node STATIC EXCLUDE_FROM_ALL
   httpserver.cpp
   i2p.cpp
   index/base.cpp
+  index/bip352.cpp
   index/blockfilterindex.cpp
   index/coinstatsindex.cpp
   index/txindex.cpp
@@ -324,6 +326,7 @@ target_link_libraries(bitcoin_node
     $<TARGET_NAME_IF_EXISTS:bitcoin_zmq>
     leveldb
     minisketch
+    secp256k1
     univalue
     Boost::headers
     $<TARGET_NAME_IF_EXISTS:libevent::core>

src/addresstype.cpp

@@ -108,6 +108,10 @@ namespace {
 class CScriptVisitor
 {
 public:
+    CScript operator()(const V0SilentPaymentDestination& dest) const
+    {
+        return CScript();
+    }
     CScript operator()(const CNoDestination& dest) const
     {
         return dest.GetScript();
@@ -156,6 +160,9 @@ class ValidDestinationVisitor
     bool operator()(const PubKeyDestination& dest) const { return false; }
     bool operator()(const PKHash& dest) const { return true; }
     bool operator()(const ScriptHash& dest) const { return true; }
+    // silent payment addresses are not valid until sending support has been implemented
+    // TODO: set this to true once sending is implemented
+    bool operator()(const V0SilentPaymentDestination& dest) const { return false; }
     bool operator()(const WitnessV0KeyHash& dest) const { return true; }
     bool operator()(const WitnessV0ScriptHash& dest) const { return true; }
     bool operator()(const WitnessV1Taproot& dest) const { return true; }

src/addresstype.h

@@ -127,6 +127,25 @@ struct PayToAnchor : public WitnessUnknown
     };
 };
 
+struct V0SilentPaymentDestination
+{
+    CPubKey m_scan_pubkey;
+    CPubKey m_spend_pubkey;
+
+    friend bool operator==(const V0SilentPaymentDestination& a, const V0SilentPaymentDestination& b) {
+        if (a.m_scan_pubkey != b.m_scan_pubkey) return false;
+        if (a.m_spend_pubkey != b.m_spend_pubkey) return false;
+        return true;
+    }
+
+    friend bool operator<(const V0SilentPaymentDestination& a, const V0SilentPaymentDestination& b) {
+        if (a.m_scan_pubkey < b.m_scan_pubkey) return true;
+        if (a.m_scan_pubkey > b.m_scan_pubkey) return false;
+        if (a.m_spend_pubkey < b.m_spend_pubkey) return true;
+        return false;
+    }
+};
+
 /**
  * A txout script categorized into standard templates.
  *  * CNoDestination: Optionally a script, no corresponding address.
@@ -140,7 +159,7 @@ struct PayToAnchor : public WitnessUnknown
  *  * WitnessUnknown: TxoutType::WITNESS_UNKNOWN destination (P2W??? address)
  *  A CTxDestination is the internal data type encoded in a bitcoin address
  */
-using CTxDestination = std::variant<CNoDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, PayToAnchor, WitnessUnknown>;
+using CTxDestination = std::variant<CNoDestination, V0SilentPaymentDestination, PubKeyDestination, PKHash, ScriptHash, WitnessV0ScriptHash, WitnessV0KeyHash, WitnessV1Taproot, PayToAnchor, WitnessUnknown>;
 
 /** Check whether a CTxDestination corresponds to one with an address. */
 bool IsValidDestination(const CTxDestination& dest);

src/bech32.h

@@ -37,6 +37,7 @@ enum class Encoding {
  *  and we would never encode an address with such a massive value */
 enum CharLimit : size_t {
     BECH32 = 90,            //!< BIP173/350 imposed character limit for Bech32(m) encoded addresses. This guarantees finding up to 4 errors.
+    SILENT_PAYMENTS = 1024, //!< BIP352 imposed 1024 character limit on Bech32m encoded silent payment addresses. This guarantees finding up to 3 errors
 };
 
 /** Encode a Bech32 or Bech32m string. If hrp contains uppercase characters, this will cause an