diff --git a/README.md b/README.md
index b379d23a..d5080421 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ go build
 ## Example command
 To run blockbook with fast synchronization, connection to ZeroMQ and providing https and socket.io interface, with database in local directory *data* and connected to local bitcoind with configuration specified by parameter  *-blockchaincfg*:
 ```
-./blockbook -sync -blockchaincfg=configs/bitcoin_testnet.json -internal=127.0.0.1:8333 -public=127.0.01:8334 -certfile=server/testcert -logtostderr 
+./blockbook -sync -blockchaincfg=configs/bitcoin_testnet.json -internal=127.0.0.1:8333 -public=127.0.0.1:8334 -certfile=server/testcert -logtostderr
 ```
 Blockbook logs to stderr *-logtostderr* or to directory specified by parameter *-log_dir* . Verbosity of logs can be tuned by command line parameters *-v* and *-vmodule*, details at https://godoc.org/github.com/golang/glog
 
diff --git a/db/rocksdb.go b/db/rocksdb.go
index 37b0c085..30285dab 100644
--- a/db/rocksdb.go
+++ b/db/rocksdb.go
@@ -21,6 +21,7 @@ import (
 // when doing huge scan, it is better to close it and reopen from time to time to free the resources
 const refreshIterator = 5000000
 const packedHeightBytes = 4
+const dbVersion = 0
 
 // RepairRocksDB calls RocksDb db repair function
 func RepairRocksDB(name string) error {
@@ -928,9 +929,13 @@ func (d *RocksDB) LoadInternalState(rpcCoin string) (*common.InternalState, erro
 	nc := make([]common.InternalStateColumn, len(cfNames))
 	for i := 0; i < len(nc); i++ {
 		nc[i].Name = cfNames[i]
+		nc[i].Version = dbVersion
 		for j := 0; j < len(sc); j++ {
 			if sc[j].Name == nc[i].Name {
-				nc[i].Version = sc[j].Version
+				// check the version of the column, if it does not match, the db is not compatible
+				if sc[j].Version != dbVersion {
+					return nil, errors.Errorf("DB version %v of column '%v' does not match the required version %v. DB is not compatible.", sc[j].Version, sc[j].Name, dbVersion)
+				}
 				nc[i].Rows = sc[j].Rows
 				nc[i].KeyBytes = sc[j].KeyBytes
 				nc[i].ValueBytes = sc[j].ValueBytes