1 files changed, 18 insertions, 0 deletions
diff --git a/validate.go b/validate.go
new file mode 100644
index 0000000..469c978
--- /dev/null
+++ b/validate.go
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
+
+package main
+
+import (
+	"crypto/sha256"
+)
+
+// validateNonce checks if the nonce for the proof of work challenge is valid
+// for the given identifier.
+func validateNonce(identifier, nonce []byte) bool {
+	h := sha256.New()
+	h.Write(identifier)
+	h.Write(nonce)
+	ck := h.Sum(nil)
+	return validateBitZeros(ck, global.NeedBits)
+}