Improve ConfirmProof and print it out in main()

main.go

@@ -1,6 +1,9 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"strconv"
+)
 
 func main() {
 	bc := NewBlockchain()
@@ -12,6 +15,8 @@ func main() {
 		fmt.Printf("Prev. hash: %x\n", block.PrevBlockHash)
 		fmt.Printf("Data: %s\n", block.Data)
 		fmt.Printf("Hash: %x\n", block.Hash)
+		pow := NewProofOfWork(block)
+		fmt.Printf("PoF: %s\n", strconv.FormatBool(pow.ConfirmProof()))
 		fmt.Println()
 	}
 }

proofofwork.go

@@ -75,10 +75,10 @@ func (pow *ProofOfWork) Run() (int, []byte) {
 }
 
 // ConfirmProof confirms that the proof is correct
-func (pow *ProofOfWork) ConfirmProof(nonce int) bool {
+func (pow *ProofOfWork) ConfirmProof() bool {
 	var hashInt big.Int
 
-	data := pow.prepareData(nonce)
+	data := pow.prepareData(pow.block.Nonce)
 	hash := sha256.Sum256(data)
 	hashInt.SetBytes(hash[:])