diff --git a/qrcode-certificate/v0/certificate.png b/qrcode-certificate/v0/certificate.png
new file mode 100644
index 0000000..5180720
Binary files /dev/null and b/qrcode-certificate/v0/certificate.png differ
diff --git a/qrcode-certificate/v0/check_qrcode_certificate.py b/qrcode-certificate/v0/check_qrcode_certificate.py
new file mode 100644
index 0000000..571b513
--- /dev/null
+++ b/qrcode-certificate/v0/check_qrcode_certificate.py
@@ -0,0 +1,24 @@
+import base64
+import binascii
+
+import nacl.signing
+
+
+def base64url_decode(raw):
+ rem = len(raw) % 4
+ if rem > 0:
+ raw += b'=' * (4 - rem)
+ return base64.urlsafe_b64decode(raw)
+
+
+hex_verify_key = '79a441b73a99ead8c4446aa36c973dd23787d459122fe2169232a07a181e37a9'
+
+verify_key = nacl.signing.VerifyKey(binascii.unhexlify(hex_verify_key))
+
+message = 'eyJ0eXBlIjogImNlcnRpZmljYXQtemZlIiwgImltbWF0cmljdWxhdGlvbiI6ICJBWi0xMjM0LUJFIiwgIm5vbSI6ICJKZWFuIE1hcmMgRHVwb25kIiwgImRhdGVfZW1pc3Npb24iOiAiMjAyMi0wNi0wNyJ9.Nno9aCyay5sxducJtpmuBDP8VBoRdwe4rfw3ohBP1bSBnmFJf17sXQdMDGDXt6eN6bzyfeI3mDrmpTnVDf81DQ'
+
+parts = message.encode().split(b'.')
+payload = base64url_decode(parts[0])
+signature = base64url_decode(parts[1])
+
+assert verify_key.verify(payload, signature)
diff --git a/qrcode-certificate/v0/make_qrcode_certificate.py b/qrcode-certificate/v0/make_qrcode_certificate.py
new file mode 100644
index 0000000..335a44d
--- /dev/null
+++ b/qrcode-certificate/v0/make_qrcode_certificate.py
@@ -0,0 +1,49 @@
+import base64
+import binascii
+import json
+
+import nacl.signing
+import qrcode
+import qrcode.constants
+import qrcode.image.svg
+
+
+def base64url_decode(raw):
+ rem = len(raw) % 4
+ if rem > 0:
+ raw += b'=' * (4 - rem)
+ return base64.urlsafe_b64decode(raw)
+
+
+def base64url_encode(raw):
+ return base64.urlsafe_b64encode(raw).rstrip(b'=')
+
+
+key = nacl.signing.SigningKey(seed=b'1234' * 8)
+print('Hex verify key:', binascii.hexlify(key.verify_key.encode()).decode())
+doc = {
+ 'type': 'certificat-zfe',
+ 'immatriculation': 'AZ-1234-BE',
+ 'nom': 'Jean Marc Dupond',
+ 'date_emission': '2022-06-07',
+}
+
+payload = json.dumps(doc).encode()
+signed = key.sign(payload)
+certificate = b'%s.%s' % (base64url_encode(payload), base64url_encode(signed.signature))
+
+# verify
+b64_payload, b64_signature = certificate.split(b'.')
+assert key.verify_key.verify(base64url_decode(b64_payload), base64url_decode(b64_signature))
+
+print(f'Certificate({len(certificate)} bytes):', certificate)
+
+qr = qrcode.QRCode(
+ error_correction=qrcode.constants.ERROR_CORRECT_L,
+ # image_factory=qrcode.image.svg.SvgPathImage,
+)
+qr.add_data(certificate)
+qr.make(fit=True)
+img = qr.make_image(fill_color='black', back_color='white')
+with open('certificate.png', 'wb') as fd:
+ img.save(fd)
diff --git a/qrcode-certificate/v0/qrcode-reader/index.html b/qrcode-certificate/v0/qrcode-reader/index.html
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index 0000000..18069b1
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+++ b/qrcode-certificate/v0/qrcode-reader/index.html
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