diff --git a/polaris/_artifact.py b/polaris/_artifact.py
index 6bccbf01..364591c9 100644
--- a/polaris/_artifact.py
+++ b/polaris/_artifact.py
@@ -1,8 +1,9 @@
 import json
-from typing import Dict, Optional
+from typing import Dict, Optional, Union
 
 import fsspec
-from pydantic import BaseModel, Field, PrivateAttr
+from pydantic import BaseModel, ConfigDict, Field, PrivateAttr, field_serializer, field_validator
+from pydantic.alias_generators import to_camel
 
 from polaris.utils.types import HubOwner, SlugCompatibleStringType
 
@@ -28,6 +29,8 @@ class BaseArtifactModel(BaseModel):
         _verified: Whether the benchmark has been verified through the Polaris Hub.
     """
 
+    model_config = ConfigDict(alias_generator=to_camel, populate_by_name=True, arbitrary_types_allowed=True)
+
     name: Optional[SlugCompatibleStringType] = None
     description: str = ""
     tags: list[str] = Field(default_factory=list)
@@ -35,6 +38,17 @@ class BaseArtifactModel(BaseModel):
     owner: Optional[HubOwner] = None
     _verified: bool = PrivateAttr(False)
 
+    @field_serializer("owner")
+    def _serialize_owner(self, value: HubOwner) -> Union[str, None]:
+        return self.owner.slug if self.owner else None
+
+    @field_validator("owner", mode="before")
+    @classmethod
+    def _validate_owner(cls, value: Union[str, HubOwner, None]):
+        if isinstance(value, str):
+            return HubOwner(slug=value)
+        return value
+
     @classmethod
     def from_json(cls, path: str):
         """Loads a benchmark from a JSON file.
diff --git a/polaris/benchmark/_base.py b/polaris/benchmark/_base.py
index 6ff6dc16..87908a4a 100644
--- a/polaris/benchmark/_base.py
+++ b/polaris/benchmark/_base.py
@@ -7,7 +7,6 @@
 import numpy as np
 import pandas as pd
 from pydantic import (
-    ConfigDict,
     FieldValidationInfo,
     field_serializer,
     field_validator,
@@ -22,8 +21,8 @@
 from polaris.utils.context import tmp_attribute_change
 from polaris.utils.dict2html import dict2html
 from polaris.utils.errors import InvalidBenchmarkError, PolarisChecksumError
-from polaris.utils.misc import listit, to_lower_camel
-from polaris.utils.types import DataFormat, PredictionsType, SplitType, AccessType
+from polaris.utils.misc import listit
+from polaris.utils.types import AccessType, DataFormat, PredictionsType, SplitType
 
 ColumnsType = Union[str, list[str]]
 
@@ -85,11 +84,6 @@ class BenchmarkSpecification(BaseArtifactModel):
     # Additional meta-data
     readme: str = ""
 
-    # Pydantic config
-    model_config = ConfigDict(
-        arbitrary_types_allowed=True, alias_generator=to_lower_camel, populate_by_name=True
-    )
-
     @field_validator("dataset")
     def _validate_dataset(cls, v):
         """
diff --git a/polaris/dataset/_column.py b/polaris/dataset/_column.py
index 70ce66cb..cf960bb7 100644
--- a/polaris/dataset/_column.py
+++ b/polaris/dataset/_column.py
@@ -2,8 +2,7 @@
 from typing import Dict, Optional, Union
 
 from pydantic import BaseModel, ConfigDict, Field, field_serializer, field_validator
-
-from polaris.utils.misc import to_lower_camel
+from pydantic.alias_generators import to_camel
 
 
 class Modality(enum.Enum):
@@ -36,13 +35,11 @@ class ColumnAnnotation(BaseModel):
     description: Optional[str] = None
     user_attributes: Dict[str, str] = Field(default_factory=dict)
 
-    model_config = ConfigDict(
-        arbitrary_types_allowed=True, alias_generator=to_lower_camel, populate_by_name=True
-    )
+    model_config = ConfigDict(arbitrary_types_allowed=True, alias_generator=to_camel, populate_by_name=True)
 
     @field_validator("modality")
     def _validate_modality(cls, v):
-        """Tries to converts a string to the Enum"""
+        """Tries to convert a string to the Enum"""
         if isinstance(v, str):
             v = Modality[v.upper()]
         return v
diff --git a/polaris/dataset/_dataset.py b/polaris/dataset/_dataset.py
index 1f8c17fe..f0e3b53c 100644
--- a/polaris/dataset/_dataset.py
+++ b/polaris/dataset/_dataset.py
@@ -10,7 +10,6 @@
 import zarr
 from loguru import logger
 from pydantic import (
-    ConfigDict,
     Field,
     field_validator,
     model_validator,
@@ -24,8 +23,7 @@
 from polaris.utils.dict2html import dict2html
 from polaris.utils.errors import InvalidDatasetError, PolarisChecksumError
 from polaris.utils.io import get_zarr_root, robust_copy
-from polaris.utils.misc import to_lower_camel
-from polaris.utils.types import HttpUrlString, License, AccessType
+from polaris.utils.types import AccessType, HttpUrlString, License
 
 # Constants
 _SUPPORTED_TABLE_EXTENSIONS = ["parquet"]
@@ -83,11 +81,6 @@ class Dataset(BaseArtifactModel):
     _has_been_warned: bool = False
     _has_been_cached: bool = False
 
-    # Pydantic config
-    model_config = ConfigDict(
-        arbitrary_types_allowed=True, alias_generator=to_lower_camel, populate_by_name=True
-    )
-
     @field_validator("table")
     def _validate_table(cls, v):
         """If the table is not a dataframe yet, assume it's a path and try load it."""
diff --git a/polaris/evaluate/_results.py b/polaris/evaluate/_results.py
index 448925bc..7e019177 100644
--- a/polaris/evaluate/_results.py
+++ b/polaris/evaluate/_results.py
@@ -4,14 +4,22 @@
 from typing import ClassVar, Optional, Union
 
 import pandas as pd
-from pydantic import BaseModel, ConfigDict, Field, PrivateAttr, field_serializer, field_validator
+from pydantic import (
+    BaseModel,
+    ConfigDict,
+    Field,
+    PrivateAttr,
+    computed_field,
+    field_serializer,
+    field_validator,
+)
+from pydantic.alias_generators import to_camel
 
 from polaris._artifact import BaseArtifactModel
 from polaris.evaluate import Metric
 from polaris.hub.settings import PolarisHubSettings
 from polaris.utils.dict2html import dict2html
 from polaris.utils.errors import InvalidResultError
-from polaris.utils.misc import to_lower_camel
 from polaris.utils.types import AccessType, HttpUrlString, HubOwner, HubUser
 
 # Define some helpful type aliases
@@ -30,7 +38,7 @@ class ResultRecords(BaseModel):
     scores: dict[Union[Metric, str], float]
 
     # Model config
-    model_config = ConfigDict(alias_generator=to_lower_camel, populate_by_name=True)
+    model_config = ConfigDict(alias_generator=to_camel, populate_by_name=True)
 
     @field_validator("scores")
     def validate_scores(cls, v):
@@ -104,10 +112,10 @@ class BenchmarkResults(BaseArtifactModel):
     # Private attributes
     _created_at: datetime = PrivateAttr(default_factory=datetime.now)
 
-    # Model config
-    model_config = ConfigDict(
-        alias_generator=to_lower_camel, populate_by_name=True, arbitrary_types_allowed=True
-    )
+    @computed_field
+    @property
+    def benchmark_artifact_id(self) -> str:
+        return f"{self.benchmark_owner}/{self.benchmark_name}"
 
     @field_validator("results")
     def _validate_results(cls, v):
diff --git a/polaris/hub/client.py b/polaris/hub/client.py
index 11859cb8..4751780b 100644
--- a/polaris/hub/client.py
+++ b/polaris/hub/client.py
@@ -16,7 +16,7 @@
 from authlib.integrations.httpx_client import OAuth2Client, OAuthError
 from authlib.oauth2.client import OAuth2Client as _OAuth2Client
 from httpx import HTTPStatusError
-from httpx._types import HeaderTypes, URLTypes, TimeoutTypes
+from httpx._types import HeaderTypes, TimeoutTypes, URLTypes
 from loguru import logger
 
 from polaris.benchmark import (
@@ -30,7 +30,7 @@
 from polaris.utils import fs
 from polaris.utils.constants import DEFAULT_CACHE_DIR
 from polaris.utils.errors import PolarisHubError, PolarisUnauthorizedError
-from polaris.utils.types import HubOwner, AccessType
+from polaris.utils.types import AccessType, HubOwner
 
 _HTTPX_SSL_ERROR_CODE = "[SSL: CERTIFICATE_VERIFY_FAILED]"
 
@@ -399,11 +399,11 @@ def upload_results(self, results: BenchmarkResults, access: AccessType = "privat
 
         # Get the serialized model data-structure
         result_json = results.model_dump(by_alias=True, exclude_none=True)
-        result_json["access"] = access
 
         # Make a request to the hub
-        url = f"/benchmark/{results.benchmark_owner}/{results.benchmark_name}/result"
-        response = self._base_request_to_hub(url=url, method="POST", json=result_json)
+        response = self._base_request_to_hub(
+            url="/result", method="POST", json={"access": access, **result_json}
+        )
 
         # Inform the user about where to find their newly created artifact.
         result_url = urljoin(
diff --git a/polaris/utils/misc.py b/polaris/utils/misc.py
index 0292835a..dc2a720e 100644
--- a/polaris/utils/misc.py
+++ b/polaris/utils/misc.py
@@ -7,9 +7,3 @@ def listit(t: Any):
     https://stackoverflow.com/questions/1014352/how-do-i-convert-a-nested-tuple-of-tuples-and-lists-to-lists-of-lists-in-python
     """
     return list(map(listit, t)) if isinstance(t, (list, tuple)) else t
-
-
-def to_lower_camel(name: str) -> str:
-    """Converts a snake_case string to lowerCamelCase"""
-    upper = "".join(word.capitalize() for word in name.split("_"))
-    return upper[:1].lower() + upper[1:]
diff --git a/polaris/utils/types.py b/polaris/utils/types.py
index 193c8770..2186eff6 100644
--- a/polaris/utils/types.py
+++ b/polaris/utils/types.py
@@ -9,14 +9,12 @@
     BaseModel,
     ConfigDict,
     HttpUrl,
-    computed_field,
     constr,
     model_validator,
 )
+from pydantic.alias_generators import to_camel
 from typing_extensions import TypeAlias
 
-from polaris.utils.misc import to_lower_camel
-
 SplitIndicesType: TypeAlias = list[int]
 """
 A split is defined by a sequence of integers.
@@ -51,9 +49,14 @@
 The target formats that are supported by the `Subset` class. 
 """
 
-SlugCompatibleStringType: TypeAlias = constr(pattern="^[A-Za-z0-9_-]+$", min_length=4, max_length=64)
+SlugStringType: TypeAlias = constr(pattern="^[a-z0-9-]+$", min_length=4, max_length=64)
 """
 A URL-compatible string that can serve as slug on the hub.
+"""
+
+SlugCompatibleStringType: TypeAlias = constr(pattern="^[A-Za-z0-9_-]+$", min_length=4, max_length=64)
+"""
+A URL-compatible string that can be turned into a slug by the hub.
 
 Can only use alpha-numeric characters, underscores and dashes. 
 The string must be at least 4 and at most 64 characters long.
@@ -87,38 +90,16 @@
 class HubOwner(BaseModel):
     """An owner of an artifact on the Polaris Hub
 
-    The slug is most important as it is the user-facing part of this data model. The organization
-    and user id are added to be consistent with the Polaris Hub.
-
-    The username is specified as a [`SlugCompatibleStringType`][polaris.utils.types.SlugCompatibleStringType],
-    whereas the organization is specified as a string that can contain only alpha-numeric characters,
-    underscores and dashes. Contrary to the username, an organization name can currently be of arbitrary length.
+    The slug is most important as it is the user-facing part of this data model.
+    The externalId and type are added to be consistent with the model returned by the Polaris Hub .
     """
 
-    slug: constr(pattern="^[A-Za-z0-9_-]+$")
-    organization_id: Optional[constr(pattern="^[A-Za-z0-9_-]+$")] = None
-    user_id: Optional[HubUser] = None
+    slug: SlugStringType
+    external_id: Optional[str] = None
+    type: Optional[Literal["user", "organization"]] = None
 
     # Pydantic config
-    model_config = ConfigDict(alias_generator=to_lower_camel, populate_by_name=True)
-
-    @model_validator(mode="after")  # type: ignore
-    @classmethod
-    def _validate_model(cls, m: "HubOwner"):
-        if m.organization_id is not None and m.user_id is not None:
-            raise ValueError("An owner cannot both have an `organization_id` and a `user_id`")
-        return m
-
-    @computed_field
-    @property
-    def owner(self) -> str:
-        return self.organization_id or self.user_id  # type: ignore
-
-    def __str__(self) -> str:
-        return self.slug
-
-    def __repr__(self) -> str:
-        return self.__str__()
+    model_config = ConfigDict(alias_generator=to_camel, populate_by_name=True)
 
 
 class License(BaseModel):
diff --git a/tests/test_type_checks.py b/tests/test_type_checks.py
index 40042efe..a9471a89 100644
--- a/tests/test_type_checks.py
+++ b/tests/test_type_checks.py
@@ -4,36 +4,36 @@
 from polaris.utils.types import HubOwner, License
 
 
+def test_slug_string_type():
+    """
+    Verifies that the slug is validated correctly.
+    Fails if:
+    - Is too short (<4 characters)
+    - Is too long (>64 characters)
+    - Contains something other than lowercase letters, numbers, and hyphens.
+    """
+    for name in ["", "x", "xx", "xxx", "x" * 65, "invalid@", "invalid!", "InvalidName1", "invalid_name"]:
+        with pytest.raises(ValueError):
+            HubOwner(slug=name)
+
+    for name in ["valid", "valid-name-1", "x" * 64, "x" * 4]:
+        HubOwner(slug=name)
+
+
 def test_slug_compatible_string_type():
     """Verifies that the artifact name is validated correctly."""
 
     # Fails if:
     # - Is too short (<4 characters)
     # - Is too long (>64 characters)
-    # - Contains non alpha-numeric characters
+    # - Contains non-alphanumeric characters
     for name in ["", "x", "xx", "xxx", "x" * 65, "invalid@", "invalid!"]:
         with pytest.raises(ValueError):
             BaseArtifactModel(name=name)
-        with pytest.raises(ValueError):
-            HubOwner(userId=name, slug=name)
 
     # Does not fail
     for name in ["valid", "valid-name", "valid_name", "ValidName1", "Valid_", "Valid-", "x" * 64, "x" * 4]:
         BaseArtifactModel(name=name)
-        HubOwner(userId=name, slug=name)
-
-
-def test_artifact_owner():
-    with pytest.raises(ValueError):
-        # No owner specified
-        HubOwner()
-    with pytest.raises(ValueError):
-        # Conflicting owner specified
-        HubOwner(organizationId="org", userId="user", slug="test")
-
-    # Valid - Only specifies one!
-    assert HubOwner(organizationId="org", slug="org").owner == "org"
-    assert HubOwner(userId="user", slug="user").owner == "user"
 
 
 def test_license():