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import hashlib
import json
import time

def enforce(snapshot: dict) -> dict:
    """
    Economic enforcement as proof-of-execution.
    """
    execution_time = time.time()
    payload = json.dumps(snapshot, sort_keys=True)

    proof = hashlib.sha256(
        f"{payload}|{execution_time}".encode()
    ).hexdigest()

    return {
        "enforced_state": snapshot,
        "execution_time": execution_time,
        "execution_proof": proof
    }