diff --git a/src/blockchain_poc_core_v1.proto b/src/blockchain_poc_core_v1.proto
index 118a075b..5e904f40 100644
--- a/src/blockchain_poc_core_v1.proto
+++ b/src/blockchain_poc_core_v1.proto
@@ -4,6 +4,15 @@ package helium;
 enum origin {
   p2p = 0;
   radio = 1;
+  grpc = 2;
+}
+
+message attestation {
+  uint64 height = 1;
+  uint64 block_time = 2;
+  uint64 block_age = 3;
+  bytes address = 4;
+  bytes signature = 5;
 }
 
 message blockchain_poc_receipt_v1 {
@@ -21,6 +30,7 @@ message blockchain_poc_receipt_v1 {
   // Transmit power at which this packet was transmitted
   // It is x10, for example: 270 = 27db, 36 = 3.6db etc
   int32 tx_power = 12;
+  attestation attestation = 13;
 }
 
 message blockchain_poc_witness_v1 {
@@ -33,6 +43,7 @@ message blockchain_poc_witness_v1 {
   float frequency = 7;
   int32 channel = 8;
   string datarate = 9;
+  attestation attestation = 13;
 }
 
 message blockchain_poc_response_v1 {
@@ -46,4 +57,4 @@ message blockchain_poc_path_element_v1 {
   bytes challengee = 1;
   blockchain_poc_receipt_v1 receipt = 2;
   repeated blockchain_poc_witness_v1 witnesses = 3;
-}
\ No newline at end of file
+}
diff --git a/src/service/gateway.proto b/src/service/gateway.proto
index f6fe9322..8ccf4896 100644
--- a/src/service/gateway.proto
+++ b/src/service/gateway.proto
@@ -69,6 +69,7 @@ message gateway_resp_v1 {
   }
   uint64 block_time = 10;
   uint64 block_age = 11;
+  bytes address = 19;
 }
 
 /* state channels */