safe mode by default (#3547)

* safe mode by default

* doc

Author: ARR552

config/default.go

@@ -102,7 +102,7 @@ EnableHttpLog = true
 SyncInterval = "1s"
 SyncChunkSize = 100
 TrustedSequencerURL = "" # If it is empty or not specified, then the value is read from the smc
-SyncBlockProtection = "latest" # latest, finalized, safe
+SyncBlockProtection = "safe" # latest, finalized, safe
 L1SynchronizationMode = "sequential"
 L1SyncCheckL2BlockHash = true
 L1SyncCheckL2BlockNumberhModulus = 30