diff --git a/lib/aiken-content-ownership/common.ak b/lib/aiken-content-ownership/common.ak
index bd8e1a6..d5903a9 100644
--- a/lib/aiken-content-ownership/common.ak
+++ b/lib/aiken-content-ownership/common.ak
@@ -1,6 +1,6 @@
 use aiken/bytearray
 use aiken/list
-use aiken/transaction.{Input, Output}
+use aiken/transaction.{Input, Output, Spend}
 use aiken/transaction/credential.{Address}
 use aiken/transaction/value.{
   AssetName, MintedValue, PolicyId, Value, flatten, from_minted_value,
@@ -161,6 +161,15 @@ pub fn value_length(value: Value) -> Int {
   list.length(flatten(value))
 }
 
+pub fn compare_output_reference(x, y) {
+  expect Spend(out_ref_x) = x
+  expect Spend(out_ref_y) = y
+  bytearray.compare(
+    out_ref_x.transaction_id.hash,
+    out_ref_y.transaction_id.hash,
+  )
+}
+
 test byte_conversion() {
   convert_int_to_bytes(1) == "1" && convert_int_to_bytes(123) == "123" && convert_int_to_bytes(
     672912,
diff --git a/plutus.json b/plutus.json
index 9b252a8..2a9bde9 100644
--- a/plutus.json
+++ b/plutus.json
@@ -11,6 +11,31 @@
     "license": "Apache-2.0"
   },
   "validators": [
+    {
+      "title": "content_registry.content_registry",
+      "datum": {
+        "title": "datum",
+        "schema": {
+          "$ref": "#/definitions/aiken_content_ownership~1types~1ContentRegistryDatum"
+        }
+      },
+      "redeemer": {
+        "title": "redeemer",
+        "schema": {
+          "$ref": "#/definitions/aiken_content_ownership~1types~1ContentRegistryRedeemer"
+        }
+      },
+      "parameters": [
+        {
+          "title": "oracle_nft",
+          "schema": {
+            "$ref": "#/definitions/ByteArray"
+          }
+        }
+      ],
+      "compiledCode": 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+      "hash": "224762cbde55de2a8d58b422c8f466899090ff2ad94f04bfc2c8deb2"
+    },
     {
       "title": "content_registry_ref_token.content_registry_ref_token",
       "redeemer": {
@@ -27,8 +52,8 @@
           }
         }
       ],
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+      "hash": "7f16bf20f7438f55bc1f6440bd4ea6db39e8b03afc5e082e558f20c7"
     },
     {
       "title": "one_time_minting_policy.one_time_minting_policy",
@@ -46,8 +71,8 @@
           }
         }
       ],
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+      "hash": "d7a75e29fc699c832922e4594b5ac04ed4701b06f680ed9d39a8e5b6"
     },
     {
       "title": "oracle_validator.oracle_validator",
@@ -63,8 +88,33 @@
           "$ref": "#/definitions/aiken_content_ownership~1types~1OracleRedeemer"
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+      "hash": "8885b57b7687038c3ae1842fa491409ee27e8f63cc5822455b7b6ec9"
     }
   ],
   "definitions": {
@@ -116,6 +166,40 @@
         }
       ]
     },
+    "Tuple$ByteArray_ByteArray": {
+      "title": "Tuple",
+      "dataType": "list",
+      "items": [
+        {
+          "$ref": "#/definitions/ByteArray"
+        },
+        {
+          "$ref": "#/definitions/ByteArray"
+        }
+      ]
+    },
+    "aiken/dict/Dict$Int_ByteArray": {
+      "title": "Dict",
+      "description": "An opaque `Dict`. The type is opaque because the module maintains some\n invariant, namely: there's only one occurrence of a given key in the dictionary.\n\n Note that the `key` parameter is a phantom-type, and only present as a\n means of documentation. Keys can be any type, yet will need to comparable\n to use functions like `insert`.\n\n See for example:\n\n ```aiken\n pub type Value =\n   Dict<PolicyId, Dict<AssetName, Int>>\n ```",
+      "dataType": "map",
+      "keys": {
+        "$ref": "#/definitions/Int"
+      },
+      "values": {
+        "$ref": "#/definitions/ByteArray"
+      }
+    },
+    "aiken/dict/Dict$Int_Tuple$ByteArray_ByteArray": {
+      "title": "Dict",
+      "description": "An opaque `Dict`. The type is opaque because the module maintains some\n invariant, namely: there's only one occurrence of a given key in the dictionary.\n\n Note that the `key` parameter is a phantom-type, and only present as a\n means of documentation. Keys can be any type, yet will need to comparable\n to use functions like `insert`.\n\n See for example:\n\n ```aiken\n pub type Value =\n   Dict<PolicyId, Dict<AssetName, Int>>\n ```",
+      "dataType": "map",
+      "keys": {
+        "$ref": "#/definitions/Int"
+      },
+      "values": {
+        "$ref": "#/definitions/Tuple$ByteArray_ByteArray"
+      }
+    },
     "aiken/transaction/OutputReference": {
       "title": "OutputReference",
       "description": "An `OutputReference` is a unique reference to an output on-chain. The `output_index`\n corresponds to the position in the output list of the transaction (identified by its id)\n that produced that output",
@@ -236,6 +320,52 @@
         }
       ]
     },
+    "aiken_content_ownership/types/ContentRegistryDatum": {
+      "title": "ContentRegistryDatum",
+      "anyOf": [
+        {
+          "title": "ContentRegistryDatum",
+          "dataType": "constructor",
+          "index": 0,
+          "fields": [
+            {
+              "title": "count",
+              "$ref": "#/definitions/Int"
+            },
+            {
+              "title": "registry",
+              "$ref": "#/definitions/aiken~1dict~1Dict$Int_ByteArray"
+            }
+          ]
+        }
+      ]
+    },
+    "aiken_content_ownership/types/ContentRegistryRedeemer": {
+      "title": "ContentRegistryRedeemer",
+      "anyOf": [
+        {
+          "title": "CreateContent",
+          "dataType": "constructor",
+          "index": 0,
+          "fields": [
+            {
+              "title": "content_hash",
+              "$ref": "#/definitions/ByteArray"
+            },
+            {
+              "title": "owner",
+              "$ref": "#/definitions/Tuple$ByteArray_ByteArray"
+            }
+          ]
+        },
+        {
+          "title": "StopContentRegistry",
+          "dataType": "constructor",
+          "index": 1,
+          "fields": []
+        }
+      ]
+    },
     "aiken_content_ownership/types/MintPolarity": {
       "title": "MintPolarity",
       "anyOf": [
@@ -342,6 +472,58 @@
           "fields": []
         }
       ]
+    },
+    "aiken_content_ownership/types/OwnershipRegistryDatum": {
+      "title": "OwnershipRegistryDatum",
+      "anyOf": [
+        {
+          "title": "OwnershipRegistryDatum",
+          "dataType": "constructor",
+          "index": 0,
+          "fields": [
+            {
+              "title": "count",
+              "$ref": "#/definitions/Int"
+            },
+            {
+              "title": "registry",
+              "$ref": "#/definitions/aiken~1dict~1Dict$Int_Tuple$ByteArray_ByteArray"
+            }
+          ]
+        }
+      ]
+    },
+    "aiken_content_ownership/types/OwnershipRegistryRedeemer": {
+      "title": "OwnershipRegistryRedeemer",
+      "anyOf": [
+        {
+          "title": "CreateOwnershipRecord",
+          "dataType": "constructor",
+          "index": 0,
+          "fields": []
+        },
+        {
+          "title": "TransferOwnership",
+          "dataType": "constructor",
+          "index": 1,
+          "fields": [
+            {
+              "title": "new_owner_toen",
+              "$ref": "#/definitions/Tuple$ByteArray_ByteArray"
+            },
+            {
+              "title": "content_number",
+              "$ref": "#/definitions/Int"
+            }
+          ]
+        },
+        {
+          "title": "StopOwnershipRegistry",
+          "dataType": "constructor",
+          "index": 2,
+          "fields": []
+        }
+      ]
     }
   }
 }
\ No newline at end of file
diff --git a/validators/tests/unit-tests/ownership_registry.ak b/validators/tests/unit-tests/ownership_registry.ak
new file mode 100644
index 0000000..ac076d9
--- /dev/null
+++ b/validators/tests/unit-tests/ownership_registry.ak
@@ -0,0 +1,153 @@
+use aiken/dict.{Dict}
+use aiken/int
+use aiken/transaction.{
+  Input, Output, ScriptContext, Spend, Transaction, placeholder,
+}
+use aiken/transaction/value.{AssetName, PolicyId, add, from_asset}
+use aiken_content_ownership/common.{compare_output_reference}
+use aiken_content_ownership/placeholder.{
+  mock_content_registry_output, mock_oracle_datum, mock_oracle_output,
+  mock_ownership_registry_output, mock_policy_id, mock_policy_id_2,
+  mock_policy_id_3, mock_policy_id_4, mock_utxo_ref,
+}
+use aiken_content_ownership/types.{
+  ContentRegistryDatum, CreateContent, CreateOwnershipRecord,
+  OwnershipRegistryDatum, StopContentRegistry,
+}
+use aiken_content_ownership/utils.{get_registry_token_name}
+use aiken_content_ownership/validators/ownership_registry.{
+  ownership_registry_logic,
+}
+
+type TestCase {
+  has_input_from_content_registry: Bool,
+  is_content_registry_redeemer_correct: Bool,
+}
+
+fn make_mock_tx_body(
+  record_count: Int,
+  content_registry: Dict<Int, ByteArray>,
+  ownership_registry: Dict<Int, (PolicyId, AssetName)>,
+  content_hash: ByteArray,
+  owner: (PolicyId, AssetName),
+  test_case: TestCase,
+) -> Transaction {
+  let content_registry_value =
+    from_asset(mock_policy_id_2(), get_registry_token_name(0), 1)
+      |> add(#"", #"", 2_000_000)
+
+  let ownership_registry_value =
+    from_asset(mock_policy_id_3(), get_registry_token_name(0), 1)
+      |> add(#"", #"", 2_000_000)
+  let content_redeemer: Data =
+    if test_case.is_content_registry_redeemer_correct {
+      CreateContent { content_hash, owner }
+    } else {
+      StopContentRegistry
+    }
+  let ownership_redeemer: Data = CreateOwnershipRecord
+  let redeemers =
+    dict.new()
+      |> dict.insert(
+           Spend(mock_utxo_ref(2)),
+           ownership_redeemer,
+           compare_output_reference,
+         )
+      |> dict.insert(
+           Spend(mock_utxo_ref(1)),
+           content_redeemer,
+           compare_output_reference,
+         )
+
+  Transaction {
+    ..placeholder(),
+    reference_inputs: [
+      Input {
+        output_reference: mock_utxo_ref(0),
+        output: mock_oracle_output(mock_oracle_datum()),
+      },
+    ],
+    inputs: [
+      Input {
+        output_reference: mock_utxo_ref(1),
+        output: Output {
+          ..mock_content_registry_output(
+            0,
+            ContentRegistryDatum {
+              count: record_count,
+              registry: content_registry,
+            },
+          ),
+          value: content_registry_value,
+        },
+      },
+      Input {
+        output_reference: mock_utxo_ref(2),
+        output: Output {
+          ..mock_ownership_registry_output(
+            0,
+            OwnershipRegistryDatum {
+              count: record_count,
+              registry: ownership_registry,
+            },
+          ),
+          value: ownership_registry_value,
+        },
+      },
+    ],
+    outputs: [
+      Output {
+        ..mock_content_registry_output(
+          0,
+          ContentRegistryDatum {
+            count: record_count + 1,
+            registry: dict.insert(
+              content_registry,
+              record_count,
+              content_hash,
+              int.compare,
+            ),
+          },
+        ),
+        value: content_registry_value,
+      },
+      Output {
+        ..mock_ownership_registry_output(
+          0,
+          OwnershipRegistryDatum {
+            count: record_count + 1,
+            registry: dict.insert(
+              ownership_registry,
+              record_count,
+              owner,
+              int.compare,
+            ),
+          },
+        ),
+        value: ownership_registry_value,
+      },
+    ],
+    redeemers: redeemers,
+  }
+}
+
+test success_mint() {
+  let redeemer = CreateOwnershipRecord
+  let dat = OwnershipRegistryDatum { count: 0, registry: dict.new() }
+  let content_hash = "QmWBaeu6y1zEcKbsEqCuhuDHPL3W8pZouCPdafMCRCSUWk"
+  let owner = (mock_policy_id_4(), "my_token_name")
+  let tx =
+    make_mock_tx_body(
+      0,
+      dict.new(),
+      dict.new(),
+      content_hash,
+      owner,
+      TestCase {
+        has_input_from_content_registry: True,
+        is_content_registry_redeemer_correct: True,
+      },
+    )
+  let ctx = ScriptContext { purpose: Spend(mock_utxo_ref(2)), transaction: tx }
+  ownership_registry_logic(mock_policy_id(), dat, redeemer, ctx)
+}