fix import

diff --git a/federation/synchron/mainchain_keeper.go b/federation/synchron/mainchain_keeper.go
index 853e9ce..f6b2f29 100644 (file)
--- a/federation/synchron/mainchain_keeper.go
+++ b/federation/synchron/mainchain_keeper.go
@@ -4,7 +4,9 @@ import (
        "bytes"
        "database/sql"
        "encoding/hex"
+       "encoding/json"
        "fmt"
+       "strings"
        "time"
 
        btmConsensus "github.com/bytom/consensus"