diff --git a/examples/common/lora_interface/LoRaInterface.cpp b/examples/common/lora_interface/LoRaInterface.cpp
index 9cf0279..9d01265 100644
--- a/examples/common/lora_interface/LoRaInterface.cpp
+++ b/examples/common/lora_interface/LoRaInterface.cpp
@@ -109,6 +109,13 @@ bool LoRaInterface::start() {
 	// begin(freq MHz, bw kHz, sf, cr, syncWord, power dBm, preamble symbols, LNA gain 0=AGC)
 	int state = chip->begin(frequency, bandwidth, spreading, coding,
 	                        RADIOLIB_SX127X_SYNC_WORD, power, 20, 0);
+	// SX127x hardware default leaves RxPayloadCrcOn=0 and RadioLib's
+	// SX127x::begin() does not touch it. Upstream RNode firmware enables
+	// CRC unconditionally (sx127x::enableCrc, RNode_Firmware.ino:531), so
+	// real RNodes silently drop frames without a CRC. Enable it here to
+	// interoperate. SX126x branches below inherit CRC-on from
+	// SX126x::begin() (setCRC(2)), so no explicit call is needed there.
+	if (state == RADIOLIB_ERR_NONE) state = chip->setCRC(true);
 
 #elif defined(BOARD_RAK4631)
 	// nRF52: SPI pins must be configured before SPI.begin()
diff --git a/src/Destination.cpp b/src/Destination.cpp
index 4259389..c0a60b0 100644
--- a/src/Destination.cpp
+++ b/src/Destination.cpp
@@ -268,8 +268,16 @@ Packet Destination::announce(const Bytes& app_data, bool path_response, const In
 		else {
 			Bytes destination_hash = _object->_hash;
 			//p random_hash = Identity::get_random_hash()[0:5] << int(time.time()).to_bytes(5, "big")
-			// CBA TODO add in time to random hash
-			Bytes random_hash = Cryptography::random(Type::Identity::RANDOM_HASH_LENGTH/8);
+			// CBA Append 5-byte big-endian timestamp to random_hash
+			uint64_t now = (uint64_t)OS::time();
+			uint8_t time_bytes[5] = {
+				(uint8_t)((now >> 32) & 0xFF),
+				(uint8_t)((now >> 24) & 0xFF),
+				(uint8_t)((now >> 16) & 0xFF),
+				(uint8_t)((now >>  8) & 0xFF),
+				(uint8_t)( now        & 0xFF)
+			};
+			Bytes random_hash = Cryptography::random(5) + Bytes(time_bytes, 5);
 
 			Bytes new_app_data(app_data);
 			if (new_app_data.empty() && !_object->_default_app_data.empty()) {