Add a script to show all block messages

list-block-messages.py

@@ -0,0 +1,34 @@
+#! /usr/bin/env python3
+
+import sys, time
+
+def prepare_message(bin_message):
+    length = 32
+    while length > 0 and bin_message[length-1] == 0:
+        length -= 1
+    bin_message = bin_message[0:length]
+    for byte in bin_message:
+        if byte < 32:
+            return "<some binary blob>"
+    try:
+        return bin_message.decode()
+    except UnicodeDecodeError:
+        return "<some binary blob>"
+
+def main():
+    try:
+        with open("blockchain", "rb") as f:
+            while True:
+                block = f.read(292)
+                if len(block) != 292:
+                    break
+                timestamp = int.from_bytes(block[244:252], "big")
+                time_info = time.strftime("%d.%m.%Y %H:%M.%S", time.localtime(timestamp))
+                message = prepare_message(block[148:180])
+                print(f"[{time_info}] {message}")
+    except FileNotFoundError:
+        print("Found no blockchain file", file=sys.stderr)
+        exit(1)
+
+if __name__ == '__main__':
+    main()