Update to follow DB spec

common/slot.go

@@ -1,12 +1,28 @@
 package common
 
+import (
+	"math/big"
+)
+
 // Slot represents a slot of the Hermez network
 // WARNING: this is strongly based on the previous implementation, once the new spec is done, this may change a lot.
 type Slot struct {
 	SlotNum       SlotNum
-	StartingBlock uint64      // Etherum block in which the slot starts
+	StartingBlock uint64      // Ethereum block in which the slot starts
 	Forger        Coordinator // Current Operaror winner information
 }
 
+// SlotMinPrice is the policy of minimum prices for strt bidding in the slots
+type SlotMinPrice struct {
+	EthBlockNum uint64 // Etherum block in which the min price was updated
+	MinPrices   [6]big.Int
+}
+
+// GetMinPrice returns the minimum bid to enter the auction for a specific slot
+func (smp *SlotMinPrice) GetMinPrice(slotNum SlotNum) *big.Int {
+	// TODO
+	return nil
+}
+
 // SlotNum identifies a slot
 type SlotNum uint32