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Python SDK

Thin, dependency-light Python client. Uses cryptography for ES256; no other runtime deps.

Install​

pip install ztxbas

Requires Python 3.9 or newer.

Import​

from ztxbas import Client, ChallengeDeniedError, ChallengeExpiredError

Minimal end-to-end​

c = Client(
    "https://ztxbas.example.com",
    "app_YOUR_APPLICATION_ID",
    "YOUR_HMAC_SECRET_HEX",
)

c.register_user("alice@example.com")
c.register_origin("https://app.example.com", "Example App")

ch = c.create_challenge("alice@example.com", "https://app.example.com")
claims = c.poll_challenge(ch["challenge_id"])
print(claims.email, claims.origin)

Errors as exceptions​

from ztxbas import (
    ChallengeDeniedError,
    ChallengeExpiredError,
    UnregisteredOriginError,
)

try:
    claims = c.poll_challenge(ch["challenge_id"])
except ChallengeDeniedError:
    ...  # user tapped Deny
except ChallengeExpiredError:
    ...  # approval too slow
except UnregisteredOriginError:
    ...  # programmer error

For the raw envelope, catch ApiError and inspect status_code, code, and message.

Verify-only mode​

from ztxbas import Verifier

v = Verifier(
    "https://ztxbas.example.com/.well-known/jwks.json",
    expected_issuer="https://ztxbas.example.com",
)
claims = v.verify(jwt_from_mobile)

Verifier is thread-safe - a single instance can back many worker threads or async tasks.

Repo and reference​