diff --git a/.github/workflows/aws-prod.yaml b/.github/workflows/aws-prod.yaml
index 5ea3719..b33c772 100644
--- a/.github/workflows/aws-prod.yaml
+++ b/.github/workflows/aws-prod.yaml
@@ -16,10 +16,10 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Configure AWS credentials
-      uses: aws-actions/configure-aws-credentials@v1
+      uses: aws-actions/configure-aws-credentials@v1-node16
       with:
         aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
         aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 28670e4..9dea42d 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -13,7 +13,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Start and test chainlog containers
       id: start-containers
diff --git a/index.html b/index.html
index 5d6c070..1f17b55 100644
--- a/index.html
+++ b/index.html
@@ -365,6 +365,34 @@
     }
   });
   formatsDiv.append(bash);
+  const solidity = document.createElement("button");
+  solidity.setAttribute("class", "copy");
+  solidity.setAttribute("name", "Solidity");
+  solidity.innerHTML = "Solidity";
+  solidity.style.marginLeft = "5px";
+  solidity.addEventListener("click", () => {
+    solidity.innerHTML = "loading…";
+    solidity.setAttribute("disabled", true);
+    const header = "contract Addresses {\n\n    mapping (bytes32 => address) public addr;\n\n    constructor() public {\n";
+    const footer = "    }\n}";
+    let text = "";
+    for (let i = 0; i < data.length; i += 64) {
+        const keyHex = data.substring(i, i + 64);
+        getAddress(keyHex, address => {
+            const key = hex2a(keyHex);
+            const space = " ".repeat(40 - key.length);
+            const statement = `        addr["${key}"]${space}= ${address};\n`;
+            text += statement;
+            if (text.match(/addr/g).length === data.length / 64) {
+                navigator.clipboard.writeText(header + text + footer);
+                uncopy();
+                solidity.innerHTML = "copied";
+                solidity.removeAttribute("disabled");
+            }
+        });
+    }
+  });
+  formatsDiv.append(solidity);
   canvas.append(formatsDiv);
   const table = document.createElement("table");
   const header = document.createElement("tr");