Initial dract of the common structs

common/batch.go

@@ -0,0 +1,24 @@
+package common
+
+import (
+	"time"
+
+	eth "github.com/ethereum/go-ethereum/common"
+)
+
+// Batch is a struct that represents Hermez network batch
+type Batch struct {
+	BatchNum      BatchNum
+	SlotNum       SlotNum // Slot in which the batch is forged
+	EthTxHash     eth.Hash
+	BlockNum      uint64 // Etherum block in which the batch is forged
+	Timestamp     time.Time
+	Forger        eth.Address
+	ExitRoot      Hash
+	OldRoot       Hash
+	NewRoot       Hash
+	TotalAccounts uint64
+}
+
+// BatchNum identifies a batch
+type BatchNum uint32