diff --git a/cashu/core/base.py b/cashu/core/base.py
index 147ab809..18ca4c8f 100644
--- a/cashu/core/base.py
+++ b/cashu/core/base.py
@@ -818,6 +818,12 @@ def generate_keys(self):
         assert self.seed, "seed not set"
         assert self.derivation_path, "derivation path not set"
 
+        # we compute the keyset id from the public keys only if it is not
+        # loaded from the database. This is to allow for backwards compatibility
+        # with old keysets with new id's and vice versa. This code can be removed
+        # if there are only new keysets in the mint (> 0.15.0)
+        id_in_db = self.id
+
         if self.version_tuple < (0, 12):
             # WARNING: Broken key derivation for backwards compatibility with < 0.12
             self.private_keys = derive_keys_backwards_compatible_insecure_pre_0_12(
@@ -828,7 +834,8 @@ def generate_keys(self):
                 f"WARNING: Using weak key derivation for keyset {self.id} (backwards"
                 " compatibility < 0.12)"
             )
-            self.id = derive_keyset_id_deprecated(self.public_keys)  # type: ignore
+            # load from db or derive
+            self.id = id_in_db or derive_keyset_id_deprecated(self.public_keys)  # type: ignore
         elif self.version_tuple < (0, 15):
             self.private_keys = derive_keys_sha256(self.seed, self.derivation_path)
             logger.trace(
@@ -836,11 +843,13 @@ def generate_keys(self):
                 " compatibility < 0.15)"
             )
             self.public_keys = derive_pubkeys(self.private_keys)  # type: ignore
-            self.id = derive_keyset_id_deprecated(self.public_keys)  # type: ignore
+            # load from db or derive
+            self.id = id_in_db or derive_keyset_id_deprecated(self.public_keys)  # type: ignore
         else:
             self.private_keys = derive_keys(self.seed, self.derivation_path)
             self.public_keys = derive_pubkeys(self.private_keys)  # type: ignore
-            self.id = derive_keyset_id(self.public_keys)  # type: ignore
+            # load from db or derive
+            self.id = id_in_db or derive_keyset_id(self.public_keys)  # type: ignore
 
 
 # ------- TOKEN -------
diff --git a/cashu/core/settings.py b/cashu/core/settings.py
index 0cf2e755..4020c098 100644
--- a/cashu/core/settings.py
+++ b/cashu/core/settings.py
@@ -58,14 +58,6 @@ class MintSettings(CashuSettings):
 
     mint_database: str = Field(default="data/mint")
     mint_test_database: str = Field(default="test_data/test_mint")
-    mint_duplicate_old_keysets: bool = Field(
-        default=True,
-        title="Duplicate keysets",
-        description=(
-            "Whether to duplicate keysets for backwards compatibility before v1 API"
-            " (Nutshell 0.15.0)."
-        ),
-    )
 
 
 class MintBackends(MintSettings):
diff --git a/cashu/mint/ledger.py b/cashu/mint/ledger.py
index 10a5c839..735a1442 100644
--- a/cashu/mint/ledger.py
+++ b/cashu/mint/ledger.py
@@ -231,9 +231,7 @@ async def activate_keyset(
         logger.debug(f"Loaded keyset {keyset.id}")
         return keyset
 
-    async def init_keysets(
-        self, autosave: bool = True, duplicate_keysets: Optional[bool] = None
-    ) -> None:
+    async def init_keysets(self, autosave: bool = True) -> None:
         """Initializes all keysets of the mint from the db. Loads all past keysets from db
         and generate their keys. Then activate the current keyset set by self.derivation_path.
 
@@ -241,9 +239,6 @@ async def init_keysets(
             autosave (bool, optional): Whether the current keyset should be saved if it is
                 not in the database yet. Will be passed to `self.activate_keyset` where it is
                 generated from `self.derivation_path`. Defaults to True.
-            duplicate_keysets (bool, optional): Whether to duplicate new keysets and compute
-                their old keyset id, and duplicate old keysets and compute their new keyset id.
-                Defaults to False.
         """
         # load all past keysets from db, the keys will be generated at instantiation
         tmp_keysets: List[MintKeyset] = await self.crud.get_keyset(db=self.db)
diff --git a/cashu/mint/migrations.py b/cashu/mint/migrations.py
index 41c9ee12..664b80c4 100644
--- a/cashu/mint/migrations.py
+++ b/cashu/mint/migrations.py
@@ -736,10 +736,10 @@ async def m018_duplicate_deprecated_keyset_ids(db: Database):
             keyset_copy = copy.copy(keyset)
             if not keyset_copy.public_keys:
                 raise Exception(f"keyset {keyset_copy.id} has no public keys")
-            if keyset.version_tuple >= (0, 15):
-                keyset_copy.id = derive_keyset_id_deprecated(keyset_copy.public_keys)
-            else:
+            if keyset.version_tuple < (0, 15):
                 keyset_copy.id = derive_keyset_id(keyset_copy.public_keys)
+            else:
+                keyset_copy.id = derive_keyset_id_deprecated(keyset_copy.public_keys)
             duplicated_keysets.append(keyset_copy)
 
         for keyset in duplicated_keysets:
diff --git a/tests/conftest.py b/tests/conftest.py
index a8d02057..a3ea4f1d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -78,9 +78,9 @@ def run(self, *args, **kwargs):
 async def ledger():
     async def start_mint_init(ledger: Ledger) -> Ledger:
         await migrate_databases(ledger.db, migrations_mint)
-        # add keysets
-        # await ledger.activate_keyset(derivation_path="old_derivation", version="0.3.3")
-        await ledger.activate_keyset(derivation_path="m/0'/0'/0'", version="0.15.0")
+        # add a new keyset (with a new ID) which will be duplicated with a keyset with an
+        # old ID by mint migration m018_duplicate_deprecated_keyset_ids
+        # await ledger.activate_keyset(derivation_path=settings.mint_derivation_path, version="0.15.0")
         await migrations_mint.m018_duplicate_deprecated_keyset_ids(ledger.db)
 
         ledger = Ledger(
diff --git a/tests/test_mint.py b/tests/test_mint.py
index 534fc051..0a46b0f3 100644
--- a/tests/test_mint.py
+++ b/tests/test_mint.py
@@ -58,17 +58,6 @@ async def test_keysets(ledger: Ledger):
     assert ledger.keyset.id == "009a1f293253e41e"
 
 
-@pytest.mark.asyncio
-async def test_keysets_backwards_compatibility_pre_v0_15(ledger: Ledger):
-    """Backwards compatibility test for keysets pre v0.15.0
-    We expect two instances of the same keyset but with different IDs.
-    First one is the new hex ID, second one is the old base64 ID.
-    """
-    assert len(ledger.keysets) == 2
-    assert list(ledger.keysets.keys()) == ["009a1f293253e41e", "eGnEWtdJ0PIM"]
-    assert ledger.keyset.id == "009a1f293253e41e"
-
-
 @pytest.mark.asyncio
 async def test_get_keyset(ledger: Ledger):
     keyset = ledger.get_keyset()
@@ -136,55 +125,6 @@ async def test_generate_promises(ledger: Ledger):
     assert promises[0].dleq.e
 
 
-@pytest.mark.asyncio
-async def test_generate_promises_deprecated_keyset_id(ledger: Ledger):
-    blinded_messages_mock = [
-        BlindedMessage(
-            amount=8,
-            B_="02634a2c2b34bec9e8a4aba4361f6bf202d7fa2365379b0840afe249a7a9d71239",
-            id="eGnEWtdJ0PIM",
-        )
-    ]
-    promises = await ledger._generate_promises(blinded_messages_mock)
-    assert (
-        promises[0].C_
-        == "031422eeffb25319e519c68de000effb294cb362ef713a7cf4832cea7b0452ba6e"
-    )
-    assert promises[0].amount == 8
-    assert promises[0].id == "eGnEWtdJ0PIM"
-
-    # DLEQ proof present
-    assert promises[0].dleq
-    assert promises[0].dleq.s
-    assert promises[0].dleq.e
-
-
-@pytest.mark.asyncio
-async def test_generate_promises_keyset_backwards_compatibility_pre_v0_15(
-    ledger: Ledger,
-):
-    """Backwards compatibility test for keysets pre v0.15.0
-    We want to generate promises using the old keyset ID.
-    We expect the promise to have the old base64 ID.
-    """
-    blinded_messages_mock = [
-        BlindedMessage(
-            amount=8,
-            B_="02634a2c2b34bec9e8a4aba4361f6bf202d7fa2365379b0840afe249a7a9d71239",
-            id="eGnEWtdJ0PIM",
-        )
-    ]
-    promises = await ledger._generate_promises(
-        blinded_messages_mock, keyset=ledger.keysets["eGnEWtdJ0PIM"]
-    )
-    assert (
-        promises[0].C_
-        == "031422eeffb25319e519c68de000effb294cb362ef713a7cf4832cea7b0452ba6e"
-    )
-    assert promises[0].amount == 8
-    assert promises[0].id == "eGnEWtdJ0PIM"
-
-
 @pytest.mark.asyncio
 async def test_generate_change_promises(ledger: Ledger):
     # Example slightly adapted from NUT-08 because we want to ensure the dynamic change
diff --git a/tests/test_mint_api.py b/tests/test_mint_api.py
index 3a7acbd3..5b105fcc 100644
--- a/tests/test_mint_api.py
+++ b/tests/test_mint_api.py
@@ -90,13 +90,6 @@ async def test_api_keysets(ledger: Ledger):
                 "unit": "sat",
                 "active": True,
             },
-            # for backwards compatibility of the new keyset ID format,
-            # we also return the same keyset with the old base64 ID
-            {
-                "id": "eGnEWtdJ0PIM",
-                "unit": "sat",
-                "active": True,
-            },
         ]
     }
     assert response.json() == expected
@@ -132,17 +125,17 @@ async def test_api_keyset_keys(ledger: Ledger):
     reason="settings.debug_mint_only_deprecated is set",
 )
 async def test_api_keyset_keys_old_keyset_id(ledger: Ledger):
-    response = httpx.get(f"{BASE_URL}/v1/keys/eGnEWtdJ0PIM")
+    response = httpx.get(f"{BASE_URL}/v1/keys/009a1f293253e41e")
     assert response.status_code == 200, f"{response.url} {response.status_code}"
     assert ledger.keyset.public_keys
     expected = {
         "keysets": [
             {
-                "id": "eGnEWtdJ0PIM",
+                "id": "009a1f293253e41e",
                 "unit": "sat",
                 "keys": {
                     str(k): v.serialize().hex()
-                    for k, v in ledger.keysets["eGnEWtdJ0PIM"].public_keys.items()  # type: ignore
+                    for k, v in ledger.keysets["009a1f293253e41e"].public_keys.items()  # type: ignore
                 },
             }
         ]
diff --git a/tests/test_mint_init.py b/tests/test_mint_init.py
index 17263164..e5c0c0c0 100644
--- a/tests/test_mint_init.py
+++ b/tests/test_mint_init.py
@@ -58,29 +58,6 @@ async def wallet(ledger: Ledger):
 @pytest.mark.asyncio
 async def test_init_keysets_with_duplicates(ledger: Ledger):
     ledger.keysets = {}
-    await ledger.init_keysets(duplicate_keysets=True)
-    assert len(ledger.keysets) == 2
-
-
-@pytest.mark.asyncio
-async def test_init_keysets_with_duplicates_via_settings(ledger: Ledger):
-    ledger.keysets = {}
-    settings.mint_duplicate_old_keysets = True
-    await ledger.init_keysets()
-    assert len(ledger.keysets) == 2
-
-
-@pytest.mark.asyncio
-async def test_init_keysets_without_duplicates(ledger: Ledger):
-    ledger.keysets = {}
-    await ledger.init_keysets(duplicate_keysets=False)
-    assert len(ledger.keysets) == 1
-
-
-@pytest.mark.asyncio
-async def test_init_keysets_without_duplicates_via_settings(ledger: Ledger):
-    ledger.keysets = {}
-    settings.mint_duplicate_old_keysets = False
     await ledger.init_keysets()
     assert len(ledger.keysets) == 1
 
diff --git a/tests/test_wallet.py b/tests/test_wallet.py
index 16d59c8d..efe96984 100644
--- a/tests/test_wallet.py
+++ b/tests/test_wallet.py
@@ -441,14 +441,10 @@ async def test_token_state(wallet1: Wallet):
 @pytest.mark.asyncio
 async def test_load_mint_keys_specific_keyset(wallet1: Wallet):
     await wallet1._load_mint_keys()
-    if settings.debug_mint_only_deprecated:
-        assert list(wallet1.keysets.keys()) == ["eGnEWtdJ0PIM"]
-    else:
-        assert list(wallet1.keysets.keys()) == ["009a1f293253e41e", "eGnEWtdJ0PIM"]
+    assert list(wallet1.keysets.keys()) == ["009a1f293253e41e"]
     await wallet1._load_mint_keys(keyset_id=wallet1.keyset_id)
     await wallet1._load_mint_keys(keyset_id="009a1f293253e41e")
     # expect deprecated keyset id to be present
-    await wallet1._load_mint_keys(keyset_id="eGnEWtdJ0PIM")
     await assert_err(
         wallet1._load_mint_keys(keyset_id="nonexistent"),
         KeysetNotFoundError(),
diff --git a/tests/test_wallet_restore.py b/tests/test_wallet_restore.py
index 9064235d..136425b3 100644
--- a/tests/test_wallet_restore.py
+++ b/tests/test_wallet_restore.py
@@ -8,7 +8,6 @@
 from cashu.core.base import Proof
 from cashu.core.crypto.secp import PrivateKey
 from cashu.core.errors import CashuError
-from cashu.core.settings import settings
 from cashu.wallet.wallet import Wallet
 from cashu.wallet.wallet import Wallet as Wallet1
 from cashu.wallet.wallet import Wallet as Wallet2
@@ -86,10 +85,6 @@ async def wallet3():
 
 
 @pytest.mark.asyncio
-@pytest.mark.skipif(
-    settings.debug_mint_only_deprecated,
-    reason="settings.debug_mint_only_deprecated is set",
-)
 async def test_bump_secret_derivation(wallet3: Wallet):
     await wallet3._init_private_key(
         "half depart obvious quality work element tank gorilla view sugar picture"