Fix Copy equality/hashCode contract

pom.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
- * SPDX-FileCopyrightText: Copyright (c) 2018-2026 Zerocracy
- * SPDX-License-Identifier: MIT
+* SPDX-FileCopyrightText: Copyright (c) 2018-2026 Zerocracy
+* SPDX-License-Identifier: MIT
 -->
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>

src/main/java/io/zold/api/Copies.java

@@ -116,7 +116,7 @@ public int compareTo(final Copy other) {
         @Override
         public boolean equals(final Object obj) {
             return obj instanceof Copy
-                && this.compareTo((Copy) obj) == 0;
+                && this.wlt.equals(((Copy) obj).wlt);
         }
 
         @Override

src/test/java/io/zold/api/CopiesTest.java

@@ -41,6 +41,23 @@ void groupsRemotesScoresIntoSingleCopy() {
         );
     }
 
+    @Test
+    void distinguishesCopiesWithDifferentWallets() {
+        final Remote remote = new Remote.Fake(
+            new RtScore(new IterableOf<>(new TextOf("a")))
+        );
+        MatcherAssert.assertThat(
+            "wallet identity defines copy equality",
+            new Copies.Copy(new Wallet.Fake(1L), remote).equals(
+                new Copies.Copy(
+                    new Wallet.Fake(2L),
+                    remote
+                )
+            ),
+            new IsEqual<>(false)
+        );
+    }
+
     private static Iterable<Copies.Copy> copies() {
         return new Copies(
             1L,