from __future__ import annotations
from typing import Dict


def generate_zk_proof(data: dict, constraints: dict) -> Dict[str, object]:
    """Placeholder ZK proof generator.

This MVP uses a deterministic, non-secure stub that returns a structure
compatible with a real ZK proof's interface. The real implementation should
produce a succinct proof that the given data satisfies the constraints without
revealing the underlying data.
"""
    # Very naive: hash of inputs to simulate a proof id, and a dummy proof artifact
    probe = {
        "proof_id": hash(str(data) + str(constraints)),
        "proof": "dummy-zk-proof",
        "valid": True,
        "revealed": None,
    }
    return probe