shadownet 0.4.1

Python SDK for the Shadownet protocol.

Shadownet — Python SDK

Python SDK for the Shadownet protocol. Implements the v0.1 RFCs in idiomatic, async, fully-typed Python.

Note (0.2.0 — repository move). This SDK previously lived at shadownet-protocol/shadownet-py. Starting with 0.2.0 it ships from the shadownet-protocol/shadownet monorepo at python-sdk/. The PyPI package name (shadownet) is unchanged — pip install shadownet and existing imports continue to work. See MIGRATION.md for details.

What this is

A reusable library — not a server, not a canonical core. It exposes the protocol primitives needed to build a Shadow:

• DID resolution — did:key (local) and did:web (async, cached, 16 KiB cap per RFC-0002).
• Verifiable Credentials — VC-JWT issuance + verification, freshness proofs, BitstringStatusList revocation (fail-closed >L1 per RFC-0003).
• SCA client — proof-session, issuance, freshness, callback-HMAC verification (RFC-0004).
• SNS client — async resolver with TTL + negative cache, signed-record verification (RFC-0005).
• A2A profile — session-token + Verifiable Presentation handshake; framework-agnostic verifier; optional FastAPI dependency (RFC-0006).
• MCP — Pydantic models + a Sidecar Protocol + a one-call helper that wires every RFC-0007 tool onto a FastMCP server.

It is consumed by shadownet-local — the Sidecar reference implementation — and by downstream Sidecar deployments that compose the SDK with their own infrastructure.

Interop with the Go SDK (in this same repo) and a planned TypeScript SDK is verified at the wire level by the conformance/ suite.

Install

pip install shadownet
# or
uv add shadownet

Python 3.12+ required. For the optional FastAPI helpers:

pip install 'shadownet[fastapi]'

Quick examples

Issue and verify a credential

from shadownet.crypto.ed25519 import Ed25519KeyPair
from shadownet.did.key import derive_did_key
from shadownet.did.resolver import Resolver
from shadownet.vc.credential import issue_credential, new_credential, verify_credential

issuer_kp = Ed25519KeyPair.generate()
issuer_did = derive_did_key(issuer_kp.public_bytes)

subject_kp = Ed25519KeyPair.generate()
subject_did = derive_did_key(subject_kp.public_bytes)

cred = new_credential(
    issuer=issuer_did,
    subject=subject_did,
    level="urn:shadownet:level:L2",
    subject_type="person",
)
token = issue_credential(issuer_key=issuer_kp, issuer_kid=issuer_did, credential=cred)

verified = await verify_credential(token, resolver=Resolver())
assert verified.level == "urn:shadownet:level:L2"

Mint and verify a presentation

from shadownet.vc.presentation import mint_presentation, verify_presentation
from shadownet.trust import TrustStore

verifier_did = "did:key:z6MkVerifier..."
vp_jwt = mint_presentation(
    holder_key=subject_kp,
    holder_did=subject_did,
    audience_did=verifier_did,
    credentials=[token],
)

trust = TrustStore.from_pairs([(issuer_did, ["urn:shadownet:level:L2"])])
result = await verify_presentation(
    vp_jwt,
    resolver=Resolver(),
    expected_audience=verifier_did,
    trust_store=trust,
)
assert len(result.credentials) == 1

Run the inbound A2A handshake

from shadownet.a2a.server import verify_handshake
from shadownet.sca.predicate import LevelLeaf

ctx = await verify_handshake(
    request_headers,                 # any Mapping[str, str]
    expected_audience=my_did,
    resolver=Resolver(),
    trust_store=trust,
    required_predicate=LevelLeaf(level="urn:shadownet:level:L2"),
)
# ctx.caller_did is the verified peer DID
# ctx.presentation.credentials are the credentials that survived every check

Register the RFC-0007 MCP tools

from mcp.server.fastmcp import FastMCP
from shadownet.mcp.register import register_shadownet_tools

server = FastMCP(name="my-sidecar")
register_shadownet_tools(server, my_sidecar_implementation)
# all required RFC-0007 tools are now exposed; opt into the optional ones with
# include_optional={"present", "audit"}

The full set of public APIs is curated under shadownet.{crypto, did, vc, sca, sns, trust, a2a, mcp}. See the tests/integration/test_birthday_flow.py for an end-to-end Sarah → Lukas walkthrough.

Conformance

tests/conformance/ validates every Pydantic wire model against the JSON Schemas in shadownet-specs/schemas/. CI fails on any drift.

Develop

uv sync --all-extras           # runtime + dev + extras
uv run pytest                  # full suite (incl. conformance), with coverage
uv run pytest -m network       # opt-in network tests
uv run ruff check .            # lint
uv run ruff format .           # format
uv run mypy src/shadownet      # strict typing

See CONTRIBUTING.md at the repo root for the full contributor guide.

Specifications

• Protocol RFCs: shadownet-specs/rfcs
• Wire-level walkthrough: shadownet-specs/examples/birthday-flow.md
• Development plan: shadownet-specs/DEVELOPMENT.md

Versioning

Releases track the protocol version they implement (0.x.y while the spec is at v0.1). Pre-releases use the PEP 440 form (0.2.0rc1) and the matching git tag (python-sdk/v0.2.0-rc.1). The monorepo tag scheme prefixes each subtree's tags with its directory: python-sdk/vX.Y.Z for the Python SDK, core/vX.Y.Z for the Go SDK, core/pgstore/vX.Y.Z for the Postgres backend. Per-release changes are recorded in CHANGELOG.md.

License

MIT.