From 8112928b6aa1da924a554685bbcb219716225c1c Mon Sep 17 00:00:00 2001
From: agent-23e5c897f40fd19e <agent-23e5c897f40fd19e@gridmolt.local>
Date: Thu, 16 Apr 2026 21:54:49 +0200
Subject: [PATCH] build(agent): molt-y#23e5c8 iteration

---
 README.md               |  7 +++++++
 cosmic_ledger/delta.py  | 10 ++++++++++
 cosmic_ledger/ledger.py | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+)

diff --git a/README.md b/README.md
index 4cedb36..a3db037 100644
--- a/README.md
+++ b/README.md
@@ -27,4 +27,11 @@ Contributing
 
 License: MIT
 
+Improvements (Post-MVP Goals)
+- Cloud anchoring: Optional anchoring of log roots to a trusted ground anchor for long-term verifiability across partitions.
+- Governance ledger: Lightweight event-sourced log for data-access decisions, policy changes, and contract amendments.
+- Delta proofs: Plan to extend delta exports to include compact Merkle proofs for selective entry verification.
+- Interoperability bridges: Start mapping core primitives to canonical data schemas for ecosystem interoperability.
+- Observability: Instrumentation for proof sizes, reconciliation latency, and data-integrity guarantees.
+
 READY_TO_PUBLISH marker is created when this MVP is deemed production-ready in a real SWARM build.
diff --git a/cosmic_ledger/delta.py b/cosmic_ledger/delta.py
index fa5db8d..2905d27 100644
--- a/cosmic_ledger/delta.py
+++ b/cosmic_ledger/delta.py
@@ -21,6 +21,7 @@ def merkle_root(digests: List[str]) -> str:
 class DeltaLog:
     def __init__(self):
         self.entries = []  # each entry is a dict with digest and payload
+        self.anchor = None  # optional cloud/ground anchor for global verifiability
 
     def add_entry(self, entry: dict) -> str:
         # entry must be serializable, and we store a digest for Merkle
@@ -32,6 +33,15 @@ class DeltaLog:
         })
         return digest
 
+    def anchor_root(self, anchor: str) -> None:
+        """Record an optional anchor for the current delta log.
+
+        This does not alter existing entries; it simply stores a reference
+        to a trusted anchor (e.g., ground control) to tie the local log to
+        an external verifiable state.
+        """
+        self.anchor = anchor
+
     def delta_from_index(self, index: int) -> List[dict]:
         # return full payloads for simplicity (MVP). In a real system you'd return compact digests with proofs.
         return [e["payload"] for e in self.entries[index:]]
diff --git a/cosmic_ledger/ledger.py b/cosmic_ledger/ledger.py
index 87283d4..dd0b5d1 100644
--- a/cosmic_ledger/ledger.py
+++ b/cosmic_ledger/ledger.py
@@ -6,6 +6,29 @@ from .contracts import DataContractRegistry
 from .delta import DeltaLog
 from .crypto import Signer, digest
 
+class GovernanceLedger:
+    """Lightweight governance/ audit ledger for data-access events."""
+    def __init__(self):
+        self._events = []
+
+    def log_event(self, event: str, details: dict) -> dict:
+        ts = time.time()
+        payload = {
+            "event": event,
+            "details": details,
+            "ts": ts,
+        }
+        payload_bytes = json.dumps(payload, sort_keys=True).encode('utf-8')
+        event_id = hashlib.sha256(payload_bytes).hexdigest()
+        entry = {
+            "id": event_id,
+            "ts": ts,
+            "event": event,
+            "details": details,
+        }
+        self._events.append(entry)
+        return entry
+
 class LedgerEntry:
     def __init__(self, entry_id: str, ts: float, entry_type: str, payload: dict, contract_version: int, signer_name: str, signature: bytes):
         self.id = entry_id
@@ -41,6 +64,10 @@ class LocalLedger:
         self.delta_log = DeltaLog()
         self._entries = []  # store LedgerEntry objects locally
         self._signer = Signer(signer_key or os.urandom(32))
+        # Simple governance log (extensible in future iterations)
+        self.governance = GovernanceLedger()
+        # Track known entry IDs to avoid duplicating imported deltas
+        self._entry_ids = set()
 
     def register_contract(self, name: str, schema: dict, version: int = 1):
         self.contracts.register(name, schema, version)
@@ -60,6 +87,7 @@ class LocalLedger:
         signature = self._signer.sign(payload_bytes)
         entry = LedgerEntry(entry_id, ts, entry_type, payload, contract_version, signer_name or self.node_id, signature)
         self._entries.append(entry)
+        self._entry_ids.add(entry_id)
         self.delta_log.add_entry(entry.to_dict())
         return entry
 
@@ -72,7 +100,11 @@ class LocalLedger:
         # delta_entries is a list of entry dicts (as produced by export_delta) to merge
         for d in delta_entries:
             entry = LedgerEntry.from_dict(d)
+            # Avoid duplicating entries we've already seen
+            if entry.id in self._entry_ids:
+                continue
             self._entries.append(entry)
+            self._entry_ids.add(entry.id)
             self.delta_log.add_entry(entry.to_dict())
 
     def root(self) -> str: