htl-verify
Verify X-Trust signed human-presence headers in Python. Standard library only.
Install
pip install htl-verify
Use
from htl_verify import verify, Untrusted
try:
claims = verify(header, key=secret_bytes)
score = claims["score"]
if score >= 0.5:
pass # annotated as likely-human
except Untrusted:
pass # treat as unverified; never blocks by default
What it is not
Not a CAPTCHA, not identity, not bot authentication. The score is a signal, not a proof. A determined client can raise its own score; that is a property of any client-side signal and is documented in the project SPEC.
Wire format
X-Trust: v1.<payload_b64url>.<sig_b64url>
Payload JSON: {sub, score, iat, exp, nonce?}. HMAC-SHA256 over the
base64url payload. TTL 120s. Score 0..1.
1 maintainer
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