diff --git a/rpcs3/Emu/Cell/Modules/sceNpTrophy.cpp b/rpcs3/Emu/Cell/Modules/sceNpTrophy.cpp
index 497b8cd32b..67b2d4c3e9 100644
--- a/rpcs3/Emu/Cell/Modules/sceNpTrophy.cpp
+++ b/rpcs3/Emu/Cell/Modules/sceNpTrophy.cpp
@@ -244,6 +244,14 @@ void fmt_class_string<SceNpCommunicationSignature>::format(std::string& out, u64
 	fmt::append(out, "%s", sign.data);
 }
 
+template <>
+void fmt_class_string<SceNpCommunicationId>::format(std::string& out, u64 arg)
+{
+	const auto& id = get_object(arg);
+
+	fmt::append(out, "{ data='%s', term='%s' (0x%x), num=%d, dummy=%d }", id.data, std::isprint(id.data[9]) ? fmt::format("%c", id.data[9]) : "", id.data[9], id.num, id.dummy);
+}
+
 // Helpers
 
 static error_code NpTrophyGetTrophyInfo(const trophy_context_t* ctxt, s32 trophyId, SceNpTrophyDetails* details, SceNpTrophyData* data);
@@ -442,27 +450,48 @@ error_code sceNpTrophyCreateContext(vm::ptr<u32> context, vm::cptr<SceNpCommunic
 		return SCE_NP_TROPHY_ERROR_NOT_SUPPORTED;
 	}
 
+	sceNpTrophy.warning("sceNpTrophyCreateContext(): commId = %s", *commId);
+
 	// rough checks for further fmt::format call
-	if (commId->num > 99)
+	const s32 comm_num = commId->num;
+	if (comm_num > 99)
 	{
 		return SCE_NP_TROPHY_ERROR_INVALID_NP_COMM_ID;
 	}
 
 	// NOTE: commId->term is unused in our code (at least until someone finds out if we need to account for it)
 
-	// generate trophy context name, limited to 9 characters
-	std::string_view name_sv(commId->data, 9);
+	// Generate trophy context name, limited to 9 characters
+	// Read once for thread-safety reasons
+	std::string name_str(commId->data, 9);
 
 	// resize the name if it was shorter than expected
-	if (const auto pos = name_sv.find_first_of('\0'); pos != std::string_view::npos)
+	if (const auto pos = name_str.find_first_of('\0'); pos != std::string_view::npos)
 	{
-		name_sv = name_sv.substr(0, pos);
+		name_str = name_str.substr(0, pos);
 	}
 
-	sceNpTrophy.warning("sceNpTrophyCreateContext(): data='%s' term=0x%x (0x%x) num=%d", name_sv, commId->data[9], commId->data[9], commId->num);
+	const SceNpCommunicationSignature commSign_data = *commSign;
+
+	if (read_from_ptr<be_t<u32>>(commSign_data.data, 0) != NP_TROPHY_COMM_SIGN_MAGIC)
+	{
+		return SCE_NP_TROPHY_ERROR_INVALID_NP_COMM_ID;
+	}
+
+	if (std::basic_string_view<u8>(&commSign_data.data[6], 6).find_first_not_of('\0') != umax)
+	{
+		// 6 padding bytes - must be 0
+		return SCE_NP_TROPHY_ERROR_INVALID_NP_COMM_ID;
+	}
+
+	if (read_from_ptr<be_t<u16>>(commSign_data.data, 4) != 0x100)
+	{
+		// Signifies version (1.00), although only one constant is allowed
+		return SCE_NP_TROPHY_ERROR_INVALID_NP_COMM_ID;
+	}
 
 	// append the commId number as "_xx"
-	std::string name = fmt::format("%s_%02d", name_sv, commId->num);
+	std::string name = fmt::format("%s_%02d", name_str, comm_num);
 
 	// create trophy context
 	const auto ctxt = idm::make_ptr<trophy_context_t>();
diff --git a/rpcs3/Emu/Cell/Modules/sceNpTrophy.h b/rpcs3/Emu/Cell/Modules/sceNpTrophy.h
index 0f3cc729cb..565f7d0b5d 100644
--- a/rpcs3/Emu/Cell/Modules/sceNpTrophy.h
+++ b/rpcs3/Emu/Cell/Modules/sceNpTrophy.h
@@ -151,6 +151,11 @@ enum
 	SCE_NP_TROPHY_STATUS_CHANGES_DETECTED    = 9,
 };
 
+enum : u32
+{
+	NP_TROPHY_COMM_SIGN_MAGIC = 0xB9DDE13B,
+};
+
 using SceNpTrophyStatusCallback = s32(u32 context, u32 status, s32 completed, s32 total, vm::ptr<void> arg);
 
 // Forward declare this function since trophyunlock needs it