diff --git a/YdnEoYtqvbBGv0hhENLDUYmc3tNfm5V5NIG5hCovHyM/reviews/2021-01-package-WXpLsg.proof.crev b/YdnEoYtqvbBGv0hhENLDUYmc3tNfm5V5NIG5hCovHyM/reviews/2021-01-package-WXpLsg.proof.crev
new file mode 100644
index 0000000..1af92f0
--- /dev/null
+++ b/YdnEoYtqvbBGv0hhENLDUYmc3tNfm5V5NIG5hCovHyM/reviews/2021-01-package-WXpLsg.proof.crev
@@ -0,0 +1,29 @@
+----- BEGIN CREV PROOF -----
+kind: package review
+version: -1
+date: "2021-01-30T23:12:08.843720526+01:00"
+from:
+  id-type: crev
+  id: YdnEoYtqvbBGv0hhENLDUYmc3tNfm5V5NIG5hCovHyM
+  url: "https://git.jcg.re/jcgruenhage/crev-proofs.git"
+package:
+  source: "https://crates.io"
+  name: yggdrasil-keys
+  version: 0.2.1
+  revision: dae6e3d7188ec5480d65dc1918a358a67e6da89d
+  digest: m78ggbdzQ6XiZ3eKPLbycKjOApscuR8gxpC15jVIi7k
+review:
+  thoroughness: high
+  understanding: high
+  rating: positive
+comment: |-
+  I've authored this and we've used it in production. We've had one overflow
+  bug for a while, but we've not experienced any issues after fixing that one.
+  
+  We had multiple people look over it by now, and we've not found any more
+  issues. The keys generated by this work fine with yggdrasil-go, and after
+  fixing that one bug we've not experienced any incompatibilites anymore.
+----- SIGN CREV PROOF -----
+EIEqdSaScpp4UwO7LCg3EBn5y1PQfJAbzQ63KZOUnei8O5bOkSluMvh1YAqN4o2PmNZbYRX3N3s467fLzPAjCA
+----- END CREV PROOF -----
+