diff --git a/dist/index.js b/dist/index.js
index a141952..86b3eed 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -70755,8 +70755,10 @@ const createAttestation = async (subjects, predicate, opts) => {
         predicateType: predicate.type,
         predicate: predicate.params,
         sigstore: opts.sigstoreInstance,
-        token: opts.githubToken
+        token: opts.githubToken,
+        skipWrite: true
     });
+    console.log(JSON.stringify(attestation.bundle));
     const result = attestation;
     if (subjects.length === 1 && opts.pushToRegistry) {
         const subject = subjects[0];
@@ -71262,10 +71264,18 @@ const getSubjectFromChecksumsString = (checksums) => {
         if (!HEX_STRING_RE.test(digest)) {
             throw new Error(`Invalid digest: ${digest}`);
         }
-        subjects.push({
-            name,
-            digest: { [digestAlgorithm(digest)]: digest }
-        });
+        if (digestAlgorithm(digest) === 'sha1') {
+            subjects.push({
+                uri: name,
+                digest: { [digestAlgorithm(digest)]: digest }
+            });
+        }
+        else {
+            subjects.push({
+                name,
+                digest: { [digestAlgorithm(digest)]: digest }
+            });
+        }
     }
     return subjects;
 };
@@ -71296,6 +71306,8 @@ const parseSubjectPathList = (input) => {
 };
 const digestAlgorithm = (digest) => {
     switch (digest.length) {
+        case 40:
+            return 'sha1';
         case 64:
             return 'sha256';
         case 128:
diff --git a/src/attest.ts b/src/attest.ts
index 3b59cdb..786845f 100644
--- a/src/attest.ts
+++ b/src/attest.ts
@@ -25,9 +25,12 @@ export const createAttestation = async (
     predicateType: predicate.type,
     predicate: predicate.params,
     sigstore: opts.sigstoreInstance,
-    token: opts.githubToken
+    token: opts.githubToken,
+    skipWrite: true
   })
 
+  console.log(JSON.stringify(attestation.bundle))
+
   const result: AttestResult = attestation
 
   if (subjects.length === 1 && opts.pushToRegistry) {
diff --git a/src/subject.ts b/src/subject.ts
index b977f18..5ce899d 100644
--- a/src/subject.ts
+++ b/src/subject.ts
@@ -189,10 +189,17 @@ const getSubjectFromChecksumsString = (checksums: string): Subject[] => {
       throw new Error(`Invalid digest: ${digest}`)
     }
 
-    subjects.push({
-      name,
-      digest: { [digestAlgorithm(digest)]: digest }
-    })
+    if (digestAlgorithm(digest) === 'sha1') {
+      subjects.push({
+        uri: name,
+        digest: { [digestAlgorithm(digest)]: digest }
+      } as any)
+    } else {
+      subjects.push({
+        name,
+        digest: { [digestAlgorithm(digest)]: digest }
+      })
+    }
   }
 
   return subjects
@@ -233,6 +240,8 @@ const parseSubjectPathList = (input: string): string[] => {
 
 const digestAlgorithm = (digest: string): string => {
   switch (digest.length) {
+    case 40:
+      return 'sha1'
     case 64:
       return 'sha256'
     case 128: