diff --git a/my_proof/models/proof_response.py b/my_proof/models/proof_response.py
index ba7e335..f5b21d2 100644
--- a/my_proof/models/proof_response.py
+++ b/my_proof/models/proof_response.py
@@ -4,6 +4,23 @@
 
 
 class ProofResponse(BaseModel):
+    """
+    Represents the response of a proof of contribution. Only the score and metadata will be written onchain, the rest of the proof lives offchain.
+
+    Onchain attributes - these are written to the data registry:
+        score: A score between 0 and 1 for the file, used to determine how valuable the file is. This can be an aggregation of the individual scores below.
+        metadata: Additional metadata about the proof
+
+    Offchain attributes - the remainder of the proof is written to IPFS
+        dlp_id: The DLP ID is found in the DLP Root Network contract after the DLP is registered.
+        valid: A single boolean to summarize if the file is considered valid in this DLP.
+        authenticity: A score between 0 and 1 to rate if the file has been tampered with.
+        ownership: A score between 0 and 1 to verify the ownership of the file.
+        quality: A score between 0 and 1 to show the quality of the file
+        uniqueness: A score between 0 and 1 to show unique the file is, compared to others in the DLP.
+        attributes: Custom attributes added to the proof to provide extra context about the encrypted file.
+    """
+
     dlp_id: int
     valid: bool = False
     score: float = 0.0
@@ -12,3 +29,4 @@ class ProofResponse(BaseModel):
     quality: float = 0.0
     uniqueness: float = 0.0
     attributes: Optional[Dict[str, Any]] = {}
+    metadata: Optional[Dict[str, Any]] = {}
diff --git a/my_proof/proof.py b/my_proof/proof.py
index c932564..929ac66 100644
--- a/my_proof/proof.py
+++ b/my_proof/proof.py
@@ -48,13 +48,18 @@ def generate(self) -> ProofResponse:
         self.proof_response.score = 0.6 * self.proof_response.quality + 0.4 * self.proof_response.ownership
         self.proof_response.valid = email_matches and total_score >= score_threshold
 
-        # Add additional metadata to the proof - these are public attributes about the data
+        # Additional (public) properties to include in the proof about the data
         self.proof_response.attributes = {
             'total_score': total_score,
             'score_threshold': score_threshold,
             'email_verified': email_matches,
         }
 
+        # Additional metadata about the proof, written onchain
+        self.proof_response.metadata = {
+            'dlp_id': self.config['dlp_id'],
+        }
+
         return self.proof_response