--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/puppy/helpers.py	Sun Oct 24 17:38:23 2021 +0200
@@ -0,0 +1,41 @@
+import hashlib
+
+"""
+Helper methods
+"""
+
+
+def get_var_int(f):
+    """
+    A VarInt (variable integer) is a field used in transaction data to indicate the number of upcoming fields,
+    or the length of an upcoming field.
+    More info: https://learnmeabitcoin.com/technical/varint
+    :param f: buffer, required
+    :return: string
+    """
+
+    prefix = f.read(1).hex()
+
+    if int(prefix, 16) == 253:
+        number_of_transactions = f.read(2)[::-1].hex()
+    elif int(prefix, 16) == 254:
+        number_of_transactions = f.read(4)[::-1].hex()
+    elif int(prefix, 16) == 255:
+        number_of_transactions = f.read(8)[::-1].hex()
+    else:
+        number_of_transactions = prefix
+
+    return number_of_transactions
+
+
+def compute_hash(data):
+    """
+    Get hash
+    :param data: bytes, required
+    :return: string
+    """
+
+    h = hashlib.sha256(data).digest()
+    h = hashlib.sha256(h).digest()
+
+    return h[::-1].hex()
\ No newline at end of file