diff --git a/certified_builder/build_url_tech_floripa.py b/certified_builder/build_url_tech_floripa.py
deleted file mode 100644
index 41ffece..0000000
--- a/certified_builder/build_url_tech_floripa.py
+++ /dev/null
@@ -1,25 +0,0 @@
-from config import config
-
-
-def build_url_tech_floripa(solana_response: dict, validation_code: str, order_id: str) -> str:
-    try:
-        base_url = config.TECH_FLORIPA_CERTIFICATE_VALIDATE_URL
-
-        url_service_solona = solana_response.get("blockchain", {}).get("verificacao_url", "")
-        registered_time = solana_response.get("certificado", {}).get("time", "")
-        registered_uuid = solana_response.get("certificado", {}).get("uuid", "")
-        registered_name = solana_response.get("certificado", {}).get("name", "")
-
-        txid_solana = url_service_solona.rsplit("/", 1)[-1] if url_service_solona else ""
-
-        full_url = (
-            f"{base_url}?validate_code={validation_code}"
-            f"&hash={txid_solana}"
-            f"&order_id={order_id}"
-            f"&registered_time={registered_time}"
-            f"&registered_uuid={registered_uuid}"
-            f"&registered_name={registered_name}"
-        )
-        return full_url
-    except Exception as e:
-        raise ValueError(f"Error building Tech Floripa URL: {str(e)}")
\ No newline at end of file
diff --git a/certified_builder/certified_builder.py b/certified_builder/certified_builder.py
index 542d81a..1a4d435 100644
--- a/certified_builder/certified_builder.py
+++ b/certified_builder/certified_builder.py
@@ -8,7 +8,7 @@
 from certified_builder.utils.fetch_file_certificate import fetch_file_certificate
 from certified_builder.certificates_on_solana import CertificatesOnSolana
 from certified_builder.make_qrcode import MakeQRCode
-from certified_builder.build_url_tech_floripa import build_url_tech_floripa
+from certified_builder.solana_explorer_url import extract_solana_explorer_url
 
 FONT_NAME = os.path.join(os.path.dirname(__file__), "fonts/PinyonScript/PinyonScript-Regular.ttf")
 VALIDATION_CODE = os.path.join(os.path.dirname(__file__), "fonts/ChakraPetch/ChakraPetch-SemiBold.ttf")
@@ -58,11 +58,8 @@ def build_certificates(self, participants: List[Participant]):
                         }
                     )
                                                            
-                    participant.authenticity_verification_url = build_url_tech_floripa(
-                        solana_response=solana_response,
-                        validation_code=participant.formated_validation_code(),
-                        order_id=participant.event.order_id
-                    )
+                    # alteração: agora usamos a função renomeada que apenas extrai o explorer_url
+                    participant.authenticity_verification_url = extract_solana_explorer_url(solana_response=solana_response)
                     
                     if not participant.authenticity_verification_url:                        
                         raise RuntimeError("Failed to get authenticity verification URL from Solana response")
diff --git a/certified_builder/solana_explorer_url.py b/certified_builder/solana_explorer_url.py
new file mode 100644
index 0000000..c36cc66
--- /dev/null
+++ b/certified_builder/solana_explorer_url.py
@@ -0,0 +1,6 @@
+def extract_solana_explorer_url(solana_response: dict) -> str:
+    # alteração: extrai a URL do explorer do bloco "blockchain" conforme contrato oficial
+    explorer_url = solana_response.get("blockchain", {}).get("explorer_url", "")
+    return explorer_url
+
+
diff --git a/tests/test_certified_builder.py b/tests/test_certified_builder.py
index db91230..ffd3dd8 100644
--- a/tests/test_certified_builder.py
+++ b/tests/test_certified_builder.py
@@ -7,6 +7,7 @@
 from models.certificate import Certificate
 from models.event import Event
 from datetime import datetime
+from unittest.mock import patch
 
 @pytest.fixture
 def mock_certificate():
@@ -80,7 +81,37 @@ def test_create_validation_code_image(certified_builder, mock_participant, mock_
 def test_build_certificates(certified_builder, mock_participant, mock_certificate_template, mock_logo):
     participants = [mock_participant]
     
+    # comentário: mock do download de imagens e da resposta do serviço Solana para evitar chamada externa
     with patch('certified_builder.utils.fetch_file_certificate.fetch_file_certificate', side_effect=[mock_certificate_template, mock_logo]), \
+         patch('certified_builder.certified_builder.CertificatesOnSolana.register_certificate_on_solana', return_value={
+             # comentário: mock alinhado ao contrato atual do serviço
+             "status": "sucesso",
+             "certificado": {
+                 "event": "evento de teste",
+                 "name": "user test",
+                 "email": "user@test.com",
+                 "uuid": "uuid-123",
+                 "time": "2025-10-31 12:05:38",
+                 "json_canonico": {"fake": "data"},
+                 "hash_sha256": "deadbeef",
+                 "txid_solana": "fake_txid_abc123",
+                 "network": "devnet",
+                 "timestamp": "2025-10-31 12:05:39",
+                 "timestamp_unix": 1730366739
+             },
+             "blockchain": {
+                 "rede": "Solana Devnet",
+                 "explorer_url": "https://explorer.solana.com/tx/fake_txid_abc123?cluster=devnet",
+                 "verificacao_url": "http://localhost:8000/certificados/verify/fake_txid_abc123",
+                 "memo_program": "MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr"
+             },
+             "validacao": {
+                 "como_validar": "Recrie o JSON canonizado e compare o hash SHA-256",
+                 "json_canonico_string": "{}",
+                 "hash_esperado": "deadbeef",
+                 "comando_validacao": "printf '{}' | shasum -a 256"
+             }
+         }), \
          patch.object(certified_builder, 'save_certificate') as mock_save:
         
         certified_builder.build_certificates(participants)