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diff --git a/defs/ethereum/artis_sigma1.png b/defs/ethereum/ats.png
similarity index 100%
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rename to defs/ethereum/ats.png
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diff --git a/defs/ethereum/rsk.png b/defs/ethereum/rsk.png
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diff --git a/defs/ethereum/artis_tau1.png b/defs/ethereum/tats.png
similarity index 100%
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rename to defs/ethereum/tats.png
diff --git a/defs/ethereum/tkov.png b/defs/ethereum/tkov.png
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diff --git a/defs/ethereum/trop.png b/defs/ethereum/trop.png
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diff --git a/defs/ethereum/ubq.png b/defs/ethereum/ubq.png
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diff --git a/tools/cointool.py b/tools/cointool.py
index c7b7f0c9b0..d9ad5526ff 100755
--- a/tools/cointool.py
+++ b/tools/cointool.py
@@ -176,6 +176,18 @@ def check_eth(coins):
         chain_name_str = "colliding chain name " + crayon(None, key, bold=True) + ":"
         print_log(logging.ERROR, chain_name_str, bucket_str)
         check_passed = False
+    for coin in coins:
+        icon_file = "defs/ethereum/%s.png" % coin["shortcut"].lower()
+        try:
+            icon = Image.open(icon_file)
+        except Exception:
+            print(coin["key"], ": failed to open icon file", icon_file)
+            check_passed = False
+            continue
+
+        if icon.size != (128, 128) or icon.mode != "RGBA":
+            print(coin["key"], ": bad icon format (must be RGBA 128x128)")
+            check_passed = False
     return check_passed