diff --git a/.eslintrc.json b/.eslintrc.json
index 6f19eb1..8d343cc 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -4,5 +4,8 @@
     "es6": true,
     "node": true,
     "browser": true
+  },
+  "rules": {
+    "no-console": ["error", { "allow": ["error"] }]
   }
 }
diff --git a/.gitignore b/.gitignore
index c9106a7..805eb31 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 node_modules
 .nyc_output
+package-lock.json
diff --git a/README.md b/README.md
index 26b7c42..286adb9 100644
--- a/README.md
+++ b/README.md
@@ -82,7 +82,7 @@ The SSB ids contain a tag at the end. This function returns it.
 So if you have a string like `@gaQw6zD4pHrg8zmrqku24zTSAINhRg=.ed25519` this function would return `ed25519`.
 This is useful as SSB start providing features for different encryption methods and cyphers.
 
-### loadOrCreateSync (filename) => keys
+### loadOrCreateSync (filename, [generateOpts]) => keys
 
 Load a file containing the your private key. the file will also
 contain a comment with a warning about keeping the file secret.
@@ -99,12 +99,13 @@ variations and parts `loadOrCreate` (async), `load`, `create`
 using the combined function is easiest.
 
 `keys` is an object as described in [`keys`](#keys) section.
+`generateOpts` is optional but if provided has the shape `{curve, seed, feedFormat}`.
 
-### loadOrCreate (filename, cb)
+### loadOrCreate (filename, [generateOpts,] cb)
 
 If a sync file access method is not available, `loadOrCreate` can be called with a
 callback. that callback will be called with `cb(null, keys)`. If loading
-the keys errored, new keys are created.
+the keys errored, new keys are created. `generateOpts` is optional but if provided has the shape `{curve, seed, feedFormat}`.
 
 ### generate(curve, seed, feedFormat) => keys
 
diff --git a/index.js b/index.js
index dbcccac..7dfe960 100644
--- a/index.js
+++ b/index.js
@@ -62,18 +62,22 @@ exports.generate = function (curve, seed, feedFormat) {
 var storage = require("./storage")(exports.generate);
 for (var key in storage) exports[key] = storage[key];
 
-exports.loadOrCreate = function (filename, cb) {
+exports.loadOrCreate = function (filename, generateOpts, cb) {
+  if (!cb) {
+    cb = generateOpts;
+    generateOpts = null;
+  }
   exports.load(filename, function (err, keys) {
     if (!err) return cb(null, keys);
-    exports.create(filename, cb);
+    exports.create(filename, generateOpts, cb);
   });
 };
 
-exports.loadOrCreateSync = function (filename) {
+exports.loadOrCreateSync = function (filename, generateOpts) {
   try {
     return exports.loadSync(filename);
   } catch (err) {
-    return exports.createSync(filename);
+    return exports.createSync(filename, generateOpts);
   }
 };
 
diff --git a/storage.js b/storage.js
index ef82540..f3fafc2 100644
--- a/storage.js
+++ b/storage.js
@@ -84,27 +84,38 @@ ${legacy ? keys.private : JSON.stringify(keys, null, 2)}
     return reconstructKeys(fs.readFileSync(filename, "ascii"));
   };
 
-  exports.create = function (filename, curve, legacy, cb) {
+  function curveOrOpts(opts) {
+    return !opts ? {} : isObject(opts) ? opts : { curve: opts };
+  }
+
+  exports.create = function (filename, generateOpts, legacy, cb) {
     if (isFunction(legacy)) (cb = legacy), (legacy = null);
-    if (isFunction(curve)) (cb = curve), (curve = null);
+    if (isFunction(generateOpts)) (cb = generateOpts), (generateOpts = null);
+
+    const { curve, seed, feedFormat } = curveOrOpts(generateOpts);
 
     filename = toFile(filename);
-    var keys = generate(curve);
+    var keys = generate(curve, seed, feedFormat);
     var keyfile = constructKeys(keys, legacy);
     mkdirp(path.dirname(filename), function (err) {
       if (err) return cb(err);
-      fs.writeFile(filename, keyfile, { mode: 0x100, flag: "wx" }, function (
-        err
-      ) {
-        if (err) return cb(err);
-        cb(null, keys);
-      });
+      fs.writeFile(
+        filename,
+        keyfile,
+        { mode: 0x100, flag: "wx" },
+        function (err) {
+          if (err) return cb(err);
+          cb(null, keys);
+        }
+      );
     });
   };
 
-  exports.createSync = function (filename, curve, legacy) {
+  exports.createSync = function (filename, generateOpts, legacy) {
+    const { curve, seed, feedFormat } = curveOrOpts(generateOpts);
+
     filename = toFile(filename);
-    var keys = generate(curve);
+    var keys = generate(curve, seed, feedFormat);
     var keyfile = constructKeys(keys, legacy);
     mkdirp.sync(path.dirname(filename));
     fs.writeFileSync(filename, keyfile, { mode: 0x100, flag: "wx" });
diff --git a/test/fs.js b/test/fs.js
index 95ae449..6abf888 100644
--- a/test/fs.js
+++ b/test/fs.js
@@ -67,6 +67,19 @@ tape("loadOrCreate can create", function (t) {
   });
 });
 
+tape("loadOrCreate can create buttwoo-v1 keys", function (t) {
+  var keyPath = path.join(os.tmpdir(), `ssb-keys-21-${Date.now()}`);
+  t.equal(fs.existsSync(keyPath), false);
+
+  ssbkeys.loadOrCreate(keyPath, { feedFormat: "buttwoo-v1" }, (err, keys) => {
+    t.error(err);
+    t.true(keys.id.startsWith("ssb:feed/buttwoo-v1/"));
+    t.equals(keys.id.length, 64);
+    t.false(keys.id.endsWith(".ed25519"));
+    t.end();
+  });
+});
+
 tape("loadOrCreateSync can load", function (t) {
   var keyPath = path.join(os.tmpdir(), `ssb-keys-3-${Date.now()}`);
   var keys = ssbkeys.generate("ed25519");
@@ -89,6 +102,17 @@ tape("loadOrCreateSync can create", function (t) {
   t.end();
 });
 
+tape("loadOrCreateSync can create buttwoo-v1 keys", function (t) {
+  var keyPath = path.join(os.tmpdir(), `ssb-keys-41-${Date.now()}`);
+  t.equal(fs.existsSync(keyPath), false);
+
+  const keys = ssbkeys.loadOrCreateSync(keyPath, { feedFormat: "buttwoo-v1" });
+  t.true(keys.id.startsWith("ssb:feed/buttwoo-v1/"));
+  t.equals(keys.id.length, 64);
+  t.false(keys.id.endsWith(".ed25519"));
+  t.end();
+});
+
 tape("don't create dir for fully-specified path", function (t) {
   const keyPath = path.join(os.tmpdir(), `ssb-keys-5-${Date.now()}`);
   t.equal(fs.existsSync(keyPath), false);