diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 52c14ada..21c30dad 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -60,11 +60,11 @@ jobs:
           egress-policy: audit
 
       - name: Checkout repository
-        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+        uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@d39d31e687223d841ef683f52467bd88e9b21c14 # v3.25.3
+        uses: github/codeql-action/init@b7cec7526559c32f1616476ff32d17ba4c59b2d6 # v3.25.5
         with:
           languages: ${{ matrix.language }}
           # If you wish to specify custom queries, you can do so here or in a config file.
@@ -74,7 +74,7 @@ jobs:
       # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
       # If this step fails, then you should remove it and run the build manually (see below)
       - name: Autobuild
-        uses: github/codeql-action/autobuild@d39d31e687223d841ef683f52467bd88e9b21c14 # v3.25.3
+        uses: github/codeql-action/autobuild@b7cec7526559c32f1616476ff32d17ba4c59b2d6 # v3.25.5
 
       # ℹ️ Command-line programs to run using the OS shell.
       # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
@@ -87,6 +87,6 @@ jobs:
       #   ./location_of_script_within_repo/buildscript.sh
 
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@d39d31e687223d841ef683f52467bd88e9b21c14 # v3.25.3
+        uses: github/codeql-action/analyze@b7cec7526559c32f1616476ff32d17ba4c59b2d6 # v3.25.5
         with:
           category: "/language:${{matrix.language}}"
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
index becc20f0..8d997cad 100644
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@@ -36,6 +36,6 @@ jobs:
           egress-policy: audit
 
       - name: 'Checkout Repository'
-        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+        uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
       - name: 'Dependency Review'
         uses: actions/dependency-review-action@0c155c5e8556a497adf53f2c18edabf945ed8e70 # v4.3.2
diff --git a/.github/workflows/fossa.yml b/.github/workflows/fossa.yml
index 6c2e688e..9dfca894 100644
--- a/.github/workflows/fossa.yml
+++ b/.github/workflows/fossa.yml
@@ -20,7 +20,7 @@ jobs:
       steps:
         - if: ${{ env.FOSSA_API_KEY != '' }}
           name: "Checkout Code"
-          uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+          uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
         - if: ${{ env.FOSSA_API_KEY != '' }}
           name: "Run FOSSA Scan"
           uses: fossas/fossa-action@47ef11b1e1e3812e88dae436ccbd2d0cbd1adab0 # v1.3.3
diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
index 998c73df..d796bd9f 100644
--- a/.github/workflows/golangci-lint.yml
+++ b/.github/workflows/golangci-lint.yml
@@ -34,12 +34,12 @@ jobs:
         with:
           egress-policy: audit
 
-      - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+      - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
       - uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
         with:
           go-version-file: "go.mod"
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@38e1018663fa5173f3968ea0777460d3de38f256 # v5.3.0
+        uses: golangci/golangci-lint-action@a4f60bb28d35aeee14e6880718e0c85ff1882e64 # v6.0.1
         with:
           version: latest
           args: --timeout=3m
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index f182fb40..e12845b2 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -62,6 +62,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+        uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
       - name: Release
-        uses: softprops/action-gh-release@9d7c94cfd0a1f3ed45544c887983e9fa900f0564 # v2.0.4
+        uses: softprops/action-gh-release@69320dbe05506a9a39fc8ae11030b214ec2d1f87 # v2.0.5
diff --git a/.github/workflows/scorecards.yml b/.github/workflows/scorecards.yml
index da8b71a4..84e777e2 100644
--- a/.github/workflows/scorecards.yml
+++ b/.github/workflows/scorecards.yml
@@ -50,12 +50,12 @@ jobs:
           egress-policy: audit
 
       - name: "Checkout code"
-        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+        uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
         with:
           persist-credentials: false
 
       - name: "Run analysis"
-        uses: ossf/scorecard-action@0864cf19026789058feabb7e87baa5f140aac736 # v2.3.1
+        uses: ossf/scorecard-action@dc50aa9510b46c811795eb24b2f1ba02a914e534 # v2.3.3
         with:
           results_file: results.sarif
           results_format: sarif
@@ -85,6 +85,6 @@ jobs:
 
       # Upload the results to GitHub's code scanning dashboard.
       - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@d39d31e687223d841ef683f52467bd88e9b21c14 # v3.25.3
+        uses: github/codeql-action/upload-sarif@b7cec7526559c32f1616476ff32d17ba4c59b2d6 # v3.25.5
         with:
           sarif_file: results.sarif
diff --git a/.github/workflows/verify-licence.yml b/.github/workflows/verify-licence.yml
index b91fd747..0351c529 100644
--- a/.github/workflows/verify-licence.yml
+++ b/.github/workflows/verify-licence.yml
@@ -31,7 +31,7 @@ jobs:
           with:
             egress-policy: audit
 
-        - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+        - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
         - uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
           with:
             go-version: '1.21.x'
diff --git a/.github/workflows/verify-schemagen.yaml b/.github/workflows/verify-schemagen.yaml
index 0e346fdb..b11775bc 100644
--- a/.github/workflows/verify-schemagen.yaml
+++ b/.github/workflows/verify-schemagen.yaml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
+      - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
       - uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # v5.0.0
         with:
           go-version: "1.21.x"
diff --git a/.github/workflows/witness.yml b/.github/workflows/witness.yml
index ea448075..10dfd44d 100644
--- a/.github/workflows/witness.yml
+++ b/.github/workflows/witness.yml
@@ -55,7 +55,7 @@ jobs:
             with:
               egress-policy: audit
 
-          - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+          - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
           - uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
             with:
               go-version: 1.21.x
diff --git a/go.mod b/go.mod
index 5ba023c8..ee71e2dd 100644
--- a/go.mod
+++ b/go.mod
@@ -5,15 +5,15 @@ go 1.21
 require (
 	cloud.google.com/go/kms v1.15.9
 	github.com/aws/aws-sdk-go-v2 v1.26.1
-	github.com/aws/aws-sdk-go-v2/config v1.27.11
-	github.com/aws/aws-sdk-go-v2/service/kms v1.31.0
+	github.com/aws/aws-sdk-go-v2/config v1.27.13
+	github.com/aws/aws-sdk-go-v2/service/kms v1.31.1
 	github.com/digitorus/pkcs7 v0.0.0-20230818184609-3a137a874352
 	github.com/digitorus/timestamp v0.0.0-20231217203849-220c5c2851b7
 	github.com/edwarnicke/gitoid v0.0.0-20220710194850-1be5bfda1f9d
 	github.com/go-git/go-git/v5 v5.11.0
 	github.com/go-jose/go-jose/v3 v3.0.3
 	github.com/in-toto/archivista v0.4.0
-	github.com/in-toto/attestation v1.0.1
+	github.com/in-toto/attestation v1.0.2
 	github.com/invopop/jsonschema v0.12.0
 	github.com/jellydator/ttlcache/v3 v3.2.0
 	github.com/mattn/go-isatty v0.0.20
@@ -40,16 +40,16 @@ require (
 	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/agnivade/levenshtein v1.1.1 // indirect
 	github.com/apparentlymart/go-textseg/v15 v15.0.0 // indirect
-	github.com/aws/aws-sdk-go-v2/credentials v1.17.11 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.17.13 // indirect
 	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.1 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.5 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.5 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0 // indirect
 	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.2 // indirect
 	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.7 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sso v1.20.5 // indirect
-	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.23.4 // indirect
-	github.com/aws/aws-sdk-go-v2/service/sts v1.28.6 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.20.6 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.24.0 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.28.7 // indirect
 	github.com/aws/smithy-go v1.20.2 // indirect
 	github.com/bahlo/generic-list-go v0.2.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
@@ -148,7 +148,7 @@ require (
 	golang.org/x/term v0.19.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
 	google.golang.org/genproto v0.0.0-20240401170217-c3f982113cda // indirect
-	google.golang.org/protobuf v1.34.0
+	google.golang.org/protobuf v1.34.1
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
diff --git a/go.sum b/go.sum
index 666a34f3..013fd7a3 100644
--- a/go.sum
+++ b/go.sum
@@ -38,10 +38,10 @@ github.com/aws/aws-sdk-go v1.50.38 h1:h8wxaLin7sFGK4sKassc1VpNcDbgAAEQJ5PHjqLAvX
 github.com/aws/aws-sdk-go v1.50.38/go.mod h1:LF8svs817+Nz+DmiMQKTO3ubZ/6IaTpq3TjupRn3Eqk=
 github.com/aws/aws-sdk-go-v2 v1.26.1 h1:5554eUqIYVWpU0YmeeYZ0wU64H2VLBs8TlhRB2L+EkA=
 github.com/aws/aws-sdk-go-v2 v1.26.1/go.mod h1:ffIFB97e2yNsv4aTSGkqtHnppsIJzw7G7BReUZ3jCXM=
-github.com/aws/aws-sdk-go-v2/config v1.27.11 h1:f47rANd2LQEYHda2ddSCKYId18/8BhSRM4BULGmfgNA=
-github.com/aws/aws-sdk-go-v2/config v1.27.11/go.mod h1:SMsV78RIOYdve1vf36z8LmnszlRWkwMQtomCAI0/mIE=
-github.com/aws/aws-sdk-go-v2/credentials v1.17.11 h1:YuIB1dJNf1Re822rriUOTxopaHHvIq0l/pX3fwO+Tzs=
-github.com/aws/aws-sdk-go-v2/credentials v1.17.11/go.mod h1:AQtFPsDH9bI2O+71anW6EKL+NcD7LG3dpKGMV4SShgo=
+github.com/aws/aws-sdk-go-v2/config v1.27.13 h1:WbKW8hOzrWoOA/+35S5okqO/2Ap8hkkFUzoW8Hzq24A=
+github.com/aws/aws-sdk-go-v2/config v1.27.13/go.mod h1:XLiyiTMnguytjRER7u5RIkhIqS8Nyz41SwAWb4xEjxs=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.13 h1:XDCJDzk/u5cN7Aple7D/MiAhx1Rjo/0nueJ0La8mRuE=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.13/go.mod h1:FMNcjQrmuBYvOTZDtOLCIu0esmxjF7RuA/89iSXWzQI=
 github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.1 h1:FVJ0r5XTHSmIHJV6KuDmdYhEpvlHpiSd38RQWhut5J4=
 github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.1/go.mod h1:zusuAeqezXzAB24LGuzuekqMAEgWkVYukBec3kr3jUg=
 github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.5 h1:aw39xVGeRWlWx9EzGVnhOR4yOjQDHPQ6o6NmBlscyQg=
@@ -54,14 +54,14 @@ github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.2 h1:Ji0DY1x
 github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.2/go.mod h1:5CsjAbs3NlGQyZNFACh+zztPDI7fU6eW9QsxjfnuBKg=
 github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.7 h1:ogRAwT1/gxJBcSWDMZlgyFUM962F51A5CRhDLbxLdmo=
 github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.7/go.mod h1:YCsIZhXfRPLFFCl5xxY+1T9RKzOKjCut+28JSX2DnAk=
-github.com/aws/aws-sdk-go-v2/service/kms v1.31.0 h1:yl7wcqbisxPzknJVfWTLnK83McUvXba+pz2+tPbIUmQ=
-github.com/aws/aws-sdk-go-v2/service/kms v1.31.0/go.mod h1:2snWQJQUKsbN66vAawJuOGX7dr37pfOq9hb0tZDGIqQ=
-github.com/aws/aws-sdk-go-v2/service/sso v1.20.5 h1:vN8hEbpRnL7+Hopy9dzmRle1xmDc7o8tmY0klsr175w=
-github.com/aws/aws-sdk-go-v2/service/sso v1.20.5/go.mod h1:qGzynb/msuZIE8I75DVRCUXw3o3ZyBmUvMwQ2t/BrGM=
-github.com/aws/aws-sdk-go-v2/service/ssooidc v1.23.4 h1:Jux+gDDyi1Lruk+KHF91tK2KCuY61kzoCpvtvJJBtOE=
-github.com/aws/aws-sdk-go-v2/service/ssooidc v1.23.4/go.mod h1:mUYPBhaF2lGiukDEjJX2BLRRKTmoUSitGDUgM4tRxak=
-github.com/aws/aws-sdk-go-v2/service/sts v1.28.6 h1:cwIxeBttqPN3qkaAjcEcsh8NYr8n2HZPkcKgPAi1phU=
-github.com/aws/aws-sdk-go-v2/service/sts v1.28.6/go.mod h1:FZf1/nKNEkHdGGJP/cI2MoIMquumuRK6ol3QQJNDxmw=
+github.com/aws/aws-sdk-go-v2/service/kms v1.31.1 h1:5wtyAwuUiJiM3DHYeGZmP5iMonM7DFBWAEaaVPHYZA0=
+github.com/aws/aws-sdk-go-v2/service/kms v1.31.1/go.mod h1:2snWQJQUKsbN66vAawJuOGX7dr37pfOq9hb0tZDGIqQ=
+github.com/aws/aws-sdk-go-v2/service/sso v1.20.6 h1:o5cTaeunSpfXiLTIBx5xo2enQmiChtu1IBbzXnfU9Hs=
+github.com/aws/aws-sdk-go-v2/service/sso v1.20.6/go.mod h1:qGzynb/msuZIE8I75DVRCUXw3o3ZyBmUvMwQ2t/BrGM=
+github.com/aws/aws-sdk-go-v2/service/ssooidc v1.24.0 h1:Qe0r0lVURDDeBQJ4yP+BOrJkvkiCo/3FH/t+wY11dmw=
+github.com/aws/aws-sdk-go-v2/service/ssooidc v1.24.0/go.mod h1:mUYPBhaF2lGiukDEjJX2BLRRKTmoUSitGDUgM4tRxak=
+github.com/aws/aws-sdk-go-v2/service/sts v1.28.7 h1:et3Ta53gotFR4ERLXXHIHl/Uuk1qYpP5uU7cvNql8ns=
+github.com/aws/aws-sdk-go-v2/service/sts v1.28.7/go.mod h1:FZf1/nKNEkHdGGJP/cI2MoIMquumuRK6ol3QQJNDxmw=
 github.com/aws/smithy-go v1.20.2 h1:tbp628ireGtzcHDDmLT/6ADHidqnwgF57XOXZe6tp4Q=
 github.com/aws/smithy-go v1.20.2/go.mod h1:krry+ya/rV9RDcV/Q16kpu6ypI4K2czasz0NC3qS14E=
 github.com/bahlo/generic-list-go v0.2.0 h1:5sz/EEAK+ls5wF+NeqDpk5+iNdMDXrh3z3nPnH1Wvgk=
@@ -204,8 +204,8 @@ github.com/grpc-ecosystem/grpc-gateway/v2 v2.19.1 h1:/c3QmbOGMGTOumP2iT/rCwB7b0Q
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.19.1/go.mod h1:5SN9VR2LTsRFsrEC6FHgRbTWrTHu6tqPeKxEQv15giM=
 github.com/in-toto/archivista v0.4.0 h1:5g79iqmyXblnnwuD+768lrEbeoE0V5H7URYJFnr0p4I=
 github.com/in-toto/archivista v0.4.0/go.mod h1:HgqAu7az0Ql0Jf844Paf0Ji5PdUMKxO5JIBh4hOjMs8=
-github.com/in-toto/attestation v1.0.1 h1:DgX1XuBkryTpj1Piq8AiMK3CMfEcec3Qv6+Ku+uI3WY=
-github.com/in-toto/attestation v1.0.1/go.mod h1:hCR5COCuENh5+VfojEkJnt7caOymbEgvyZdKifD6pOw=
+github.com/in-toto/attestation v1.0.2 h1:ICqV41bfaDC3ixVUzAtFxFu+Dy56EPcjiIrJQe+4LVM=
+github.com/in-toto/attestation v1.0.2/go.mod h1:3uRayZSKuCHDDZOxLm5UfYulqqd1L1NdzYvxX/jyZEM=
 github.com/invopop/jsonschema v0.12.0 h1:6ovsNSuvn9wEQVOyc72aycBMVQFKz7cPdMJn10CvzRI=
 github.com/invopop/jsonschema v0.12.0/go.mod h1:ffZ5Km5SWWRAIN6wbDXItl95euhFz2uON45H2qjYt+0=
 github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 h1:BQSFePA1RWJOlocH6Fxy8MmwDt+yVQYULKfN0RoTN8A=
@@ -513,8 +513,8 @@ google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-google.golang.org/protobuf v1.34.0 h1:Qo/qEd2RZPCf2nKuorzksSknv0d3ERwp1vFG38gSmH4=
-google.golang.org/protobuf v1.34.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
+google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
diff --git a/internal/policy/policy.go b/internal/policy/policy.go
index d1d32aee..483ee359 100644
--- a/internal/policy/policy.go
+++ b/internal/policy/policy.go
@@ -25,6 +25,7 @@ import (
 	"github.com/in-toto/go-witness/log"
 	"github.com/in-toto/go-witness/policy"
 	"github.com/in-toto/go-witness/timestamp"
+	"github.com/sigstore/fulcio/pkg/certificate"
 )
 
 type VerifyPolicySignatureOptions struct {
@@ -37,6 +38,7 @@ type VerifyPolicySignatureOptions struct {
 	policyEmails               []string
 	policyOrganizations        []string
 	policyURIs                 []string
+	fulcioCertExtensions       certificate.Extensions
 }
 
 type Option func(*VerifyPolicySignatureOptions)
@@ -81,6 +83,12 @@ func NewVerifyPolicySignatureOptions(opts ...Option) *VerifyPolicySignatureOptio
 	return vo
 }
 
+func VerifyWithPolicyFulcioCertExtensions(extensions certificate.Extensions) Option {
+	return func(vo *VerifyPolicySignatureOptions) {
+		vo.fulcioCertExtensions = extensions
+	}
+}
+
 func VerifyWithPolicyCertConstraints(commonName string, dnsNames []string, emails []string, organizations []string, uris []string) Option {
 	return func(vo *VerifyPolicySignatureOptions) {
 		vo.policyCommonName = commonName
@@ -125,6 +133,7 @@ func VerifyPolicySignature(ctx context.Context, envelope dsse.Envelope, vo *Veri
 					Emails:        vo.policyEmails,
 					Organizations: vo.policyOrganizations,
 					DNSNames:      vo.policyDNSNames,
+					Extensions:    vo.fulcioCertExtensions,
 				},
 			}
 
diff --git a/policy/constraints.go b/policy/constraints.go
index 194b4464..d1c15bfb 100644
--- a/policy/constraints.go
+++ b/policy/constraints.go
@@ -110,7 +110,7 @@ func (cc CertConstraint) checkExtensions(ext []pkix.Extension) error {
 	for _, field := range fields {
 		constraintField := reflect.ValueOf(cc.Extensions).FieldByName(field.Name)
 		if constraintField.String() == "" {
-			log.Infof("No constraint for field %s, allowing all values", field.Name)
+			log.Debugf("No constraint for field %s, allowing all values", field.Name)
 			continue
 		}
 		extensionsField := reflect.ValueOf(extensions).FieldByName(field.Name)
diff --git a/run.go b/run.go
index b904999e..cac035e9 100644
--- a/run.go
+++ b/run.go
@@ -89,9 +89,12 @@ type RunResult struct {
 // Deprecated: Use RunWithExports instead
 func Run(stepName string, opts ...RunOption) (RunResult, error) {
 	results, err := run(stepName, opts)
-	if len(results) > 1 {
+	if len(results) == 0 {
+		return RunResult{}, err
+	} else if len(results) > 1 {
 		return RunResult{}, errors.New("expected a single result, got multiple")
 	}
+
 	return results[0], err
 }
 
diff --git a/verify.go b/verify.go
index 21f40002..f24b9224 100644
--- a/verify.go
+++ b/verify.go
@@ -16,6 +16,7 @@ package witness
 
 import (
 	"context"
+	"crypto/x509"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -28,6 +29,8 @@ import (
 	"github.com/in-toto/go-witness/policy"
 	"github.com/in-toto/go-witness/slsa"
 	"github.com/in-toto/go-witness/source"
+	"github.com/in-toto/go-witness/timestamp"
+	"github.com/sigstore/fulcio/pkg/certificate"
 )
 
 func VerifySignature(r io.Reader, verifiers ...cryptoutil.Verifier) (dsse.Envelope, error) {
@@ -88,12 +91,36 @@ func VerifyWithRunOptions(opts ...RunOption) VerifyOption {
 	}
 }
 
+func VerifyWithPolicyFulcioCertExtensions(extensions certificate.Extensions) VerifyOption {
+	return func(vo *verifyOptions) {
+		vo.verifyPolicySignatureOptions = append(vo.verifyPolicySignatureOptions, ipolicy.VerifyWithPolicyFulcioCertExtensions(extensions))
+	}
+}
+
 func VerifyWithPolicyCertConstraints(commonName string, dnsNames []string, emails []string, organizations []string, uris []string) VerifyOption {
 	return func(vo *verifyOptions) {
 		vo.verifyPolicySignatureOptions = append(vo.verifyPolicySignatureOptions, ipolicy.VerifyWithPolicyCertConstraints(commonName, dnsNames, emails, organizations, uris))
 	}
 }
 
+func VerifyWithPolicyTimestampAuthorities(verifiers []timestamp.TimestampVerifier) VerifyOption {
+	return func(vo *verifyOptions) {
+		vo.verifyPolicySignatureOptions = append(vo.verifyPolicySignatureOptions, ipolicy.VerifyWithPolicyTimestampAuthorities(verifiers))
+	}
+}
+
+func VerifyWithPolicyCARoots(certs []*x509.Certificate) VerifyOption {
+	return func(vo *verifyOptions) {
+		vo.verifyPolicySignatureOptions = append(vo.verifyPolicySignatureOptions, ipolicy.VerifyWithPolicyCARoots(certs))
+	}
+}
+
+func VerifyWithPolicyCAIntermediates(certs []*x509.Certificate) VerifyOption {
+	return func(vo *verifyOptions) {
+		vo.verifyPolicySignatureOptions = append(vo.verifyPolicySignatureOptions, ipolicy.VerifyWithPolicyCAIntermediates(certs))
+	}
+}
+
 type VerifyResult struct {
 	RunResult
 	VerificationSummary slsa.VerificationSummary