Cambio en valor de gasPrice

app/managers.py

@@ -62,7 +62,9 @@ class TimestampManager(models.Manager):
 
         contract = TimestampManager.get_current_contract()
 
-        return contract.functions.stamp(proof_hash, file_hash).transact({'from': Web3.toChecksumAddress(ACCOUNT_ADDRESS), 'gas': GAS, 'gasPrice': GAS_PRICE})
+        web3 = TimestampManager.get_provider()
+
+        return contract.functions.stamp(proof_hash, file_hash).transact({'from': Web3.toChecksumAddress(ACCOUNT_ADDRESS), 'gas': GAS, 'gasPrice': web3.eth.gasPrice})
 
 
     @staticmethod