diff --git a/acceptance/python/Dockerfile b/acceptance/python/Dockerfile
index a106dcf..340841b 100644
--- a/acceptance/python/Dockerfile
+++ b/acceptance/python/Dockerfile
@@ -7,4 +7,5 @@ RUN pip install --upgrade \
 	websocket-client~=0.47.0 \
 	pytest~=3.0 \
 	planetmint-driver>=0.9.0 \
-	blns
+	blns \
+	planetmint-cryptoconditions>=0.9.0
diff --git a/acceptance/python/src/test_zenroom.py b/acceptance/python/src/test_zenroom.py
new file mode 100644
index 0000000..323cdbb
--- /dev/null
+++ b/acceptance/python/src/test_zenroom.py
@@ -0,0 +1,207 @@
+# GOAL:
+# In this script I tried to implement the ECDSA signature using zenroom
+
+# However, the scripts are customizable and so with the same procedure
+# we can implement more complex smart contracts
+
+# PUBLIC IDENTITY
+# The public identity of the users in this script (Bob and Alice)
+# is the pair (ECDH public key, Testnet address)
+
+import json
+
+import hashlib
+from cryptoconditions import ZenroomSha256
+from json.decoder import JSONDecodeError
+
+# from zenroom import zencode_exec
+
+# from bigchaindb_driver import BigchainDB
+# # bdb_root_url = 'https://ipdb3.riddleandcode.com'
+# bdb_root_url = 'http://localhost:9984/'
+# bdb = BigchainDB(bdb_root_url)
+
+# The procedure to generate the keyring cannot be
+# fixed in the code base, it depends on the particular
+# smart contract
+GENERATE_KEYPAIR = \
+    """Rule input encoding base58
+    Rule output encoding base58
+    Scenario 'ecdh': Create the keypair
+    Given that I am known as 'Pippo'
+    When I create the ecdh key
+    When I create the testnet key
+    Then print data"""
+
+def genkey():
+    return json.loads(ZenroomSha256.run_zenroom(GENERATE_KEYPAIR).output)['keys']
+
+# There is not a unique way of generating the public
+# key, for example, for the testnet I don't want the
+# public key but the address (but there could exist
+# a script in which the user want the public key and
+# not the address)
+# Thus we cannot fix it inside the script
+
+# secret key to public key
+SK_TO_PK = \
+    """Rule input encoding base58
+    Rule output encoding base58
+    Scenario 'ecdh': Create the keypair
+    Given that I am known as '{}'
+    Given I have the 'keys'
+    When I create the ecdh public key
+    When I create the testnet address
+    Then print my 'ecdh public key'
+    Then print my 'testnet address'"""
+
+def sk2pk(name, keys):
+    return json.loads(ZenroomSha256.run_zenroom(SK_TO_PK.format(name),
+                                                keys={'keys': keys}).output)
+# Alice assert the composition of the houses
+
+# zen_public_keys is an identity dictionary
+
+alice, bob = genkey(), genkey()
+print("============== ALICE KEYPAIR =================")
+print(alice)
+print("============== BOB KEYPAIR =================")
+print(bob)
+
+asset = {
+    "data": {
+        "houses": [
+            {
+                "name": "Harry",
+                "team": "Gryffindor",
+            },
+            {
+                "name": "Draco",
+                "team": "Slytherin",
+            }
+        ],
+    }
+}
+zen_public_keys = sk2pk('Alice', alice)
+zen_public_keys.update(sk2pk('Bob', bob))
+
+data = {
+    'also': 'more data'
+}
+print("============== PUBLIC IDENTITIES =================")
+print(zen_public_keys)
+
+metadata = {
+}
+
+version = '2.0'
+
+fulfill_script = """Rule input encoding base58
+Rule output encoding base58
+Scenario 'ecdh': Bob verifies the signature from Alice
+Given I have a 'ecdh public key' from 'Alice'
+Given that I have a 'string dictionary' named 'houses' inside 'asset'
+Given I have a 'signature' named 'data.signature' inside 'result'
+When I verify the 'houses' has a signature in 'data.signature' by 'Alice'
+Then print the string 'ok'
+"""
+# CRYPTO-CONDITIONS: instantiate an Ed25519 crypto-condition for buyer
+zenSha = ZenroomSha256(script=fulfill_script, keys=zen_public_keys, data=data)
+
+# CRYPTO-CONDITIONS: generate the condition uri
+condition_uri = zenSha.condition.serialize_uri()
+# CRYPTO-CONDITIONS: construct an unsigned fulfillment dictionary
+unsigned_fulfillment_dict = {
+    'type': zenSha.TYPE_NAME,
+    'script': fulfill_script,
+    'keys': zen_public_keys,
+}
+
+output = {
+    'amount': '1000',
+    'condition': {
+        'details': unsigned_fulfillment_dict,
+        'uri': condition_uri,
+    },
+    'data': data,
+    'script': fulfill_script,
+    'conf': '',
+    'public_keys': (zen_public_keys['Alice']['ecdh_public_key'], ),
+}
+
+
+input_ = {
+    'fulfillment': None,
+    'fulfills': None,
+    'owners_before': (zen_public_keys['Alice']['ecdh_public_key'], ),
+}
+
+token_creation_tx = {
+    'operation': 'CREATE',
+    'asset': asset,
+    'metadata': None,
+    'outputs': (output,),
+    'inputs': (input_,),
+    'version': version,
+    'id': None,
+}
+
+# JSON: serialize the transaction-without-id to a json formatted string
+message = json.dumps(
+    token_creation_tx,
+    sort_keys=True,
+    separators=(',', ':'),
+    ensure_ascii=False,
+)
+
+print("====== GENERATE RESULT (METADATA) =======")
+condition_script = """Rule input encoding base58
+    Rule output encoding base58
+    Scenario 'ecdh': create the signature of an object
+    Given I have the 'keys'
+    Given that I have a 'string dictionary' named 'houses' inside 'asset'
+    When I create the signature of 'houses'
+    When I rename the 'signature' to 'data.signature'
+    Then print the 'data.signature'
+    """
+
+# THIS FILLS THE METADATA WITH THE RESULT
+try:
+    assert(not zenSha.validate(message=message))
+except JSONDecodeError:
+    pass
+except ValueError:
+    pass
+
+message = zenSha.sign(message, condition_script, alice)
+assert(zenSha.validate(message=message))
+# now metadata looks like
+# 'metadata': {'result': {'data.signature': {'r': 'fdoan0GYo9RGP8y0fq+PKZ9Q1V8+VqJtBkSMB1tUnGQ=', 's': 'RnJCEepYJcVgFG/Y6cRc/2DWPaz5Pe5NpdRWegrZk5A='}}}
+
+# CRYPTO-CONDITIONS: generate the fulfillment uri
+fulfillment_uri = zenSha.serialize_uri()
+
+# add the fulfillment uri (signature)
+token_creation_tx['inputs'][0]['fulfillment'] = fulfillment_uri
+print(token_creation_tx)
+
+# JSON: serialize the id-less transaction to a json formatted string
+json_str_tx = json.dumps(
+    token_creation_tx,
+    sort_keys=True,
+    separators=(',', ':'),
+    ensure_ascii=False,
+)
+
+
+# SHA3: hash the serialized id-less transaction to generate the id
+shared_creation_txid = hashlib.sha3_256(json_str_tx.encode()).hexdigest()
+
+# add the id
+token_creation_tx['id'] = shared_creation_txid
+
+# exit()
+# send CREATE tx into the bdb network
+# returned_creation_tx = bdb.transactions.send_async(token_creation_tx)
+
+# print(returned_creation_tx)
\ No newline at end of file