From 48e0a989c1101103df1986ba9acc033a0a455a51 Mon Sep 17 00:00:00 2001
From: Duke <duke@hush.is>
Date: Thu, 29 May 2025 02:39:58 -0400
Subject: [PATCH] Decode utf8 in opreturn and convert to hex

---
 src/wallet/rpcwallet.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 54a5310dd..1852db336 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -5157,9 +5157,14 @@ UniValue z_sendmany(const UniValue& params, bool fHelp, const CPubKey& mypk)
     if(params.size() == 5) {
         opretValue = params[4].get_str();
 
+        // Support a prefix "utf8:" which allows giving utf8 text instead of hex
         if(opretValue.get_str().substr(0,5) == "utf8:") {
-            // TODO: 1) remove the first 5 chars
-            //       2) convert remaining text to hex and store in opretValue
+            auto str = opretValue.get_str().substr(5);
+            if (utf8::is_valid(str)) {
+                opretValue = HexStr(str);
+            } else {
+                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid utf8 in opreturn");
+            }
         }
     }