diff --git a/docs/openapi.yaml b/docs/openapi.yaml
index f97ea00..3a77c2d 100644
--- a/docs/openapi.yaml
+++ b/docs/openapi.yaml
@@ -542,6 +542,7 @@ paths:
                 transaction_id:
                   type: string
                   description: Transaction ID
+                  example: '581186ab56765aed64a3e73172872a6454c604c6b4e08a8ed03eabad94e74d64'
       responses:
         200:
           description: Successful operation
diff --git a/src/ethereum/nft.rs b/src/ethereum/nft.rs
index 81ccb5c..0fc1f31 100644
--- a/src/ethereum/nft.rs
+++ b/src/ethereum/nft.rs
@@ -127,7 +127,10 @@ pub async fn process_nft_events(
                 let token_id: i32 = token_id_u256.try_into()
                     .map_err(|_| EthereumError::ConversionError)?;
                 post.token_id = Some(token_id);
-                post.token_tx_id = Some(tx_id);
+                if post.token_tx_id.as_ref() != Some(&tx_id) {
+                    log::warn!("overwriting incorrect tx id {:?}", post.token_tx_id);
+                    post.token_tx_id = Some(tx_id);
+                };
                 update_post(db_client, &post).await?;
                 token_waitlist_map.remove(&post.id);
             };