diff --git a/rfc/0010_Duniter_Blockchain_Protocol_V12.md b/rfc/0010_Duniter_Blockchain_Protocol_V12.md
index 54c97abbb093313f57dbbb8d4c2c9c5714b0e0fb..bc92c69f5482ad787a4f2eefd3e7f930c91c8c80 100644
--- a/rfc/0010_Duniter_Blockchain_Protocol_V12.md
+++ b/rfc/0010_Duniter_Blockchain_Protocol_V12.md
@@ -2172,8 +2172,19 @@ For each ENTRY in local MINDEX where `op = 'UPDATE', expired_on = 0`:
 
 For each ENTRY in local MINDEX where `type == 'JOIN' OR type == 'ACTIVE'`:
 
+If `HEAD.version >= 12`
+
+    BLOCKCHAIN = REDUCE_BY(GLOBAL_CINDEX[receiver=ENTRY.pub], 'issuer')[expired_on=0]
+    INCOMING = LOCAL_CINDEX[receiver=ENTRY.pub]
+    UNIQUE_ISSUERS = UNIQ(CONCAT(
+        PICK(BLOCKCHAIN, 'issuer'),
+        PICK(INCOMING, 'issuer')))
+    ENTRY.enoughCerts = COUNT(UNIQUE_ISSUERS) >= sigQty
+
+else
+
     ENTRY.enoughCerts = COUNT(GLOBAL_CINDEX[receiver=ENTRY.pub,expired_on=null]) + COUNT(LOCAL_CINDEX[receiver=ENTRY.pub,expired_on=null]) >= sigQty 
-    
+
 > Functionally: any member or newcomer needs `[sigQty]` certifications coming *to* him to be in the WoT
 
 For each ENTRY in local MINDEX where `!(type == 'JOIN' OR type == 'ACTIVE')`: