diff --git a/README.md b/README.md
index c7c3222..417f421 100644
--- a/README.md
+++ b/README.md
@@ -1,24 +1,18 @@
-# SignalVault Verifiable Privacy-Preserving Signal Repository (MVP)
+# SignalVault MVP
 
-This project implements a portable, graph-backed signal store focused on verifiable provenance,
-offline replay, and privacy-preserving sharing of market signals across venues. The MVP defines
-canonical graph primitives (SignalNode, Edge, Scenario, HedgePlan) and a Graph-of-Contracts
-registry to map adapters to data feeds, risk models, and execution engines.
+Portable, graph-backed signal store for finance with offline replay and privacy-preserving sharing.
 
-What you get in this MVP:
-- Core graph primitives and a tiny in-memory registry
-- Deterministic replay engine for applying deltas and reconstructing signal state
-- Privacy primitives placeholders (secure aggregation, DP budgets)
-- Toy adapters for a price feed and a simulated venue
-- Lightweight tests validating schema and replay behavior
+Key components
+- Canonical graph primitives: SignalNode, Edge, Scenario, HedgePlan
+- Graph-of-Contracts registry for adapters and data contracts
+- Deterministic offline replay engine for reproducible backtests
+- Toy adapters: price feed and simulated venue
+- Lightweight privacy primitives placeholder (budgets, simple aggregation)
 
-How to run locally:
-- Ensure Python 3.11+ is installed
-- Run tests via: ./test.sh
-- Build package via: python3 -m build (as part of test.sh)
+Quick start
+- Run tests: pytest
+- The MVP demonstrates basic delta application and deterministic replay across two adapters.
 
-Publishing notes:
-- Python package name: signalvault_verifiable_privacy_preservin
-- Exposes a small public API surface for MVP exploration and integration tests
-
-This repo intentionally keeps scope minimal and testable to facilitate 1-feature-per-sprint iteration.
+Notes
+- This is a minimal, MVP-focused subset intended to bootstrap the broader SignalVault vision.
+- See signalvault/ for the core primitives and demo adapters.
diff --git a/signalvault/__init__.py b/signalvault/__init__.py
new file mode 100644
index 0000000..40847cf
--- /dev/null
+++ b/signalvault/__init__.py
@@ -0,0 +1,24 @@
+"""SignalVault MVP package
+
+A lightweight, graph-backed store for verifiable market signals with offline replay.
+This module exposes the core primitives and tiny adapters used in tests.
+"""
+
+from .schema import SignalNode, Edge, Scenario, HedgePlan, AuditLog, PrivacyBudget
+from .registry import GraphOfContractsRegistry
+from .replay import DeterministicReplayEngine
+from .adapters.price_feed_adapter import PriceFeedAdapter
+from .adapters.simulated_venue_adapter import SimulatedVenueAdapter
+
+__all__ = [
+    "SignalNode",
+    "Edge",
+    "Scenario",
+    "HedgePlan",
+    "AuditLog",
+    "PrivacyBudget",
+    "GraphOfContractsRegistry",
+    "DeterministicReplayEngine",
+    "PriceFeedAdapter",
+    "SimulatedVenueAdapter",
+]
diff --git a/signalvault/adapters/price_feed_adapter.py b/signalvault/adapters/price_feed_adapter.py
new file mode 100644
index 0000000..896c5f5
--- /dev/null
+++ b/signalvault/adapters/price_feed_adapter.py
@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Optional
+
+from ..schema import SignalNode
+import time
+
+
+@dataclass
+class PriceFeedAdapter:
+    asset: str
+    venue: str
+    def generate_signal(self, price: float, timestamp: Optional[int] = None) -> SignalNode:
+        ts = timestamp if timestamp is not None else int(time.time())
+        # Simple heuristic: price above threshold yields a positive signal
+        signal_type = "price_above_threshold" if price > 100 else "price_below_threshold"
+        return SignalNode(asset=self.asset, venue=self.venue, signal_type=signal_type, timestamp=ts, quality=1.0)
diff --git a/signalvault/adapters/simulated_venue_adapter.py b/signalvault/adapters/simulated_venue_adapter.py
new file mode 100644
index 0000000..f769a0a
--- /dev/null
+++ b/signalvault/adapters/simulated_venue_adapter.py
@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Dict
+
+from ..schema import HedgePlan
+
+
+@dataclass
+class SimulatedVenueAdapter:
+    venue_name: str = "SimVenue"
+
+    def submit_plan(self, plan: HedgePlan) -> Dict[str, str]:
+        # Tiny stub that pretends order is always accepted
+        return {"venue": self.venue_name, "order_id": f"ORD-{plan.id}", "status": "accepted"}
diff --git a/signalvault/registry.py b/signalvault/registry.py
new file mode 100644
index 0000000..e591627
--- /dev/null
+++ b/signalvault/registry.py
@@ -0,0 +1,25 @@
+from __future__ import annotations
+
+from typing import Dict, Any
+from .schema import HedgePlan
+
+
+class GraphOfContractsRegistry:
+    """A tiny in-memory registry mapping adapters to their data/contract contracts."""
+
+    def __init__(self) -> None:
+        self._registry: Dict[str, Dict[str, Any]] = {}
+
+    def register_adapter(self, name: str, contract: Dict[str, Any]) -> None:
+        self._registry[name] = contract
+
+    def get_contract(self, name: str) -> dict[str, Any] | None:
+        return self._registry.get(name)
+
+    def conformance_check(self, name: str, contract_candidate: dict[str, Any]) -> bool:
+        # Minimal conformance: ensure required keys exist
+        required = {"version", "data_contract"}
+        if name not in self._registry:
+            return False
+        base = self._registry[name]
+        return required.issubset(set(base.keys())) and "data_contract" in base
diff --git a/signalvault/replay.py b/signalvault/replay.py
new file mode 100644
index 0000000..2bf067a
--- /dev/null
+++ b/signalvault/replay.py
@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+import hashlib
+from typing import Dict, List
+
+from .schema import SignalNode, Edge, HedgePlan
+
+
+def _hash(obj: object) -> str:
+    return hashlib.sha256(repr(obj).encode("utf-8")).hexdigest()
+
+
+class DeterministicReplayEngine:
+    """A tiny deterministic replay engine that applies deltas to an in-memory state.
+
+    State is a dict with keys:
+      - nodes: dict[id, SignalNode]
+      - edges: list[Edge]
+      - hedges: dict[id, HedgePlan]
+    """
+
+    def __init__(self) -> None:
+        self.nodes = {}
+        self.edges = []
+        self.hedges = {}
+        self._applied_hashes: List[str] = []
+        self._node_counter = 0
+
+    def _next_node_id(self) -> str:
+        self._node_counter += 1
+        return f"n{self._node_counter}"
+
+    def apply_delta(self, delta):
+        # delta can contain: add_nodes, add_edges, add_hedges
+        if isinstance(delta, dict) and "add_nodes" in delta and delta["add_nodes"]:
+            for n in delta["add_nodes"]:
+                if getattr(n, "id", None) is None:
+                    self._node_counter += 1
+                    n = SignalNode(asset=n.asset, venue=n.venue, signal_type=n.signal_type, timestamp=n.timestamp, quality=n.quality, id=f"n{self._node_counter}")
+                self.nodes[n.id] = n
+
+        if isinstance(delta, dict) and "add_edges" in delta and delta["add_edges"]:
+            for e in delta["add_edges"]:
+                self.edges.append(e)
+
+        if isinstance(delta, dict) and "add_hedges" in delta and delta["add_hedges"]:
+            for h in delta["add_hedges"]:
+                self.hedges[h.id] = h
+
+        h = _hash((delta, self.nodes, self.edges, self.hedges))
+        self._applied_hashes.append(h)
+        return h
+
+    def replay_to_hash(self, target_hash: str) -> Dict[str, object]:
+        # Very small replay: return the current in-memory state if last applied hash matches
+        # Minimal: return a snapshot of current in-memory structures
+        return {"nodes": self.nodes, "edges": self.edges, "hedges": self.hedges}
diff --git a/signalvault/schema.py b/signalvault/schema.py
new file mode 100644
index 0000000..a35ff6c
--- /dev/null
+++ b/signalvault/schema.py
@@ -0,0 +1,56 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import List, Optional
+
+
+@dataclass(frozen=True)
+class SignalNode:
+    asset: str
+    venue: str
+    signal_type: str
+    timestamp: int
+    quality: float = 1.0
+    id: Optional[str] = None
+
+    def __post_init__(self):
+        if self.timestamp < 0:
+            raise ValueError("timestamp must be non-negative")
+
+
+@dataclass(frozen=True)
+class Edge:
+    from_node: SignalNode
+    to_node: SignalNode
+    relation: str  # e.g., "causal", "derived_from", etc.
+    delta_hash: str
+
+
+@dataclass
+class Scenario:
+    id: str
+    nodes: List[SignalNode] = field(default_factory=list)
+    edges: List[Edge] = field(default_factory=list)
+    description: str = ""
+
+
+@dataclass
+class HedgePlan:
+    id: str
+    delta: dict
+    version: int = 1
+    approvals: List[str] = field(default_factory=list)
+
+
+@dataclass
+class AuditLog:
+    entries: List[str] = field(default_factory=list)
+    signer: str | None = None
+    timestamp: int | None = None
+    contract_id: str | None = None
+
+
+@dataclass
+class PrivacyBudget:
+    per_signal_budget: dict[str, float] = field(default_factory=dict)
+    global_budget: float = 0.0
diff --git a/tests/test_signalvault_mvp.py b/tests/test_signalvault_mvp.py
new file mode 100644
index 0000000..ed8dd1f
--- /dev/null
+++ b/tests/test_signalvault_mvp.py
@@ -0,0 +1,47 @@
+import time
+import sys, os
+# Ensure repo root is on PYTHONPATH for tests when executed in isolation
+repo_root = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
+if repo_root not in sys.path:
+    sys.path.insert(0, repo_root)
+from signalvault.schema import SignalNode, HedgePlan
+from signalvault.registry import GraphOfContractsRegistry
+from signalvault.replay import DeterministicReplayEngine
+from signalvault.adapters.price_feed_adapter import PriceFeedAdapter
+from signalvault.adapters.simulated_venue_adapter import SimulatedVenueAdapter
+
+
+def test_basic_delta_application_and_replay():
+    # Setup adapters
+    price_adapter = PriceFeedAdapter(asset="AAPL", venue="TestVenue")
+    venue_adapter = SimulatedVenueAdapter()
+
+    # Create initial nodes via adapter
+    node1 = price_adapter.generate_signal(price=120.0, timestamp=1)
+    node2 = price_adapter.generate_signal(price=80.0, timestamp=2)
+
+    # Build a simple delta: add two nodes
+    delta1 = {"add_nodes": [node1, node2]}
+
+    engine = DeterministicReplayEngine()
+    hash1 = engine.apply_delta(delta1)
+
+    # Add an edge and a hedge plan delta
+    edge = (node1, node2, "derived_from", "hash123")
+    from signalvault.schema import Edge, HedgePlan
+    e = Edge(from_node=node1, to_node=node2, relation=edge[2], delta_hash=edge[3])
+    plan = HedgePlan(id="plan-1", delta={"example": True}, version=1, approvals=["alice"])
+    delta2 = {"add_edges": [e], "add_hedges": [plan]}
+    hash2 = engine.apply_delta(delta2)
+
+    # Replay to the latest hash (no state change for this test beyond cumulative delta)
+    state = engine.replay_to_hash(hash2)
+    assert isinstance(state, dict)
+    assert "nodes" in state and len(state["nodes"]) >= 2
+    assert len(state["edges"]) == 1
+    assert len(state["hedges"]) == 1
+
+    # Idempotence: applying the same delta again should result in a new hash but identical counts
+    hash3 = engine.apply_delta(delta2)
+    assert hash3 != hash2  # hashing includes state; re-applying delta changes hash
+    assert len(state["nodes"]) >= 2