diff --git a/data/identities.nix b/data/identities.nix
new file mode 100644
index 0000000..0d4d521
--- /dev/null
+++ b/data/identities.nix
@@ -0,0 +1,51 @@
+rec {
+  # API
+  getAccessKeys = user: map (k: k.key) (builtins.attrValues users.${user}.access);
+  getSigningEntries = user: map (k: k.entry) (builtins.attrValues users.${user}.sign);
+
+  # Data
+  users = {
+    artem = {
+      access = {
+        ssh-mars = {
+          key = "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBJg7zQ4H0LQeQcILZBwCzQ+MYKtCgKm7HPe9oFeoyprKZXAvpm+HDHtaYdU39JF9f+nvRztzXuMhgETAQMAQCkc= ssh@mars";
+        };
+        yubikey-office = {
+          key = "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIPAtIXXHm58julnr7S0xzBTM1jN5JkKxOL4JpuWDOa2jAAAABHNzaDo= yubikey-office";
+        };
+        yubikey-keychain = {
+          key = "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIHY1xx0huqV6Mcc2WngYDabITeNUbGamJ8//206MxxVTAAAABHNzaDo= yubikey-keychain";
+        };
+        yubikey-safe = {
+          key = "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIHzY2eOz+JdaKOpIgZbF5FsZzQy0l8vPJjAQdTpBFGsoAAAABHNzaDo= yubikey-safe";
+        };
+        artem = {
+          key = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBxRBsFGa8OFbviYDGSAKLgfm/K2XUxvCo+31FW37yab artem";
+        };
+      };
+
+      sign = {
+        # Access keys as signers
+        artem = {
+          entry = "dot.doom@gmail.com namespaces=\"git\" ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBxRBsFGa8OFbviYDGSAKLgfm/K2XUxvCo+31FW37yab artem";
+        };
+
+        # Sign-only keys
+        sign-mars = {
+          entry = "dot.doom@gmail.com namespaces=\"git\" ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBNwSX/Ib6kNzgRKqWfcb3HsAQQo++Gt9KeXSvP6NDk6YQPjDsi+//IiBovgLjQ34El+x8l8y3aYhfIGlCyX7aOM= sign@mars";
+        };
+        yubikey-office = {
+          entry = "dot.doom@gmail.com namespaces=\"git\" sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIHqC278Y4NCvNh4qiGtfpK5+CNQv+tTDseP67HLFX6u3AAAAEXNzaDpnaXQtc2lnbmF0dXJl yubikey-keychain";
+          serial = "36027052";
+        };
+        yubikey-keychain = {
+          entry = "dot.doom@gmail.com namespaces=\"git\" sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIPBpgGDNkJHMtpZQ+1CcWdZRDUEXdjcZsxH9M9ebexb6AAAAEXNzaDpnaXQtc2lnbmF0dXJl yubikey-keychain";
+          serial = "20723090";
+        };
+        yubikey-safe = {
+          entry = "dot.doom@gmail.com namespaces=\"git\" sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIOd/DCO4lo8PH9EjKMtgGBGoc6SevLvTdWVlNbjrc6NsAAAAEXNzaDpnaXQtc2lnbmF0dXJl yubikey-safe";
+        };
+      };
+    };
+  };
+}
diff --git a/flake.nix b/flake.nix
index 79bdc23..47e788b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -28,6 +28,9 @@
         futureware = import ./modules/futureware.nix;
         tools = import ./modules/tools.nix;
         sshd = import ./modules/sshd.nix;
+        identities = {
+          _module.args.identities = import ./data/identities.nix;
+        };
       };
 
       lib.pre-commit = import ./pre-commit.nix;