diff --git a/Makefile b/Makefile
index 90f47df..ec4d070 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
-.PHONY: validate validate-control-plane-examples validate-nlboot-examples validate-lattice-data-governai-examples validate-ops-history-examples validate-runtime-observability-examples validate-lifecycle-boundary-examples validate-svf-contracts
+.PHONY: validate validate-control-plane-examples validate-nlboot-examples validate-lattice-data-governai-examples validate-ops-history-examples validate-runtime-observability-examples validate-lifecycle-boundary-examples validate-svf-contracts validate-sync-cycle-receipts
 
-validate: validate-control-plane-examples validate-nlboot-examples validate-lattice-data-governai-examples validate-ops-history-examples validate-runtime-observability-examples validate-lifecycle-boundary-examples validate-svf-contracts
+validate: validate-control-plane-examples validate-nlboot-examples validate-lattice-data-governai-examples validate-ops-history-examples validate-runtime-observability-examples validate-lifecycle-boundary-examples validate-svf-contracts validate-sync-cycle-receipts
 	@echo "OK: validate"
 
 validate-control-plane-examples:
@@ -29,3 +29,7 @@ validate-lifecycle-boundary-examples:
 
 validate-svf-contracts:
 	python3 tools/validate_svf_contracts.py
+
+validate-sync-cycle-receipts:
+	python3 -m pip install --user jsonschema >/dev/null
+	python3 tools/validate_sync_cycle_receipts.py
diff --git a/examples/sync-cycle-receipt.dry-run.json b/examples/sync-cycle-receipt.dry-run.json
new file mode 100644
index 0000000..34a8c5f
--- /dev/null
+++ b/examples/sync-cycle-receipt.dry-run.json
@@ -0,0 +1,33 @@
+{
+  "id": "urn:srcos:sync-receipt:builder-aarch64-2026-06-16T00:00:00Z-dry",
+  "type": "SyncCycleReceipt",
+  "specVersion": "0.1.0",
+  "cycleId": "cycle-builder-aarch64-20260616-dry",
+  "engineId": "sourceos.sync.katello-content",
+  "org": "SocioProphet",
+  "contentView": "sourceos-builder-aarch64",
+  "fromVersion": "1.0",
+  "toVersion": "1.1",
+  "lifecycleEnv": "dev",
+  "locus": "local",
+  "outcome": "dry_run",
+  "policyGate": "allowed",
+  "policyReason": "locus 'local' is in ALLOWED_LOCI",
+  "steps": [
+    {
+      "step": "nix copy --from http://127.0.0.1:8101 github:SociOS-Linux/source-os#builder-aarch64",
+      "status": "dry_run",
+      "reason": "dry_run=True; would execute nix copy"
+    },
+    {
+      "step": "nixos-rebuild switch --flake github:SociOS-Linux/source-os#builder-aarch64",
+      "status": "dry_run",
+      "reason": "dry_run=True; would execute nixos-rebuild switch"
+    }
+  ],
+  "nixCacheUrl": "http://127.0.0.1:8101",
+  "flakeRef": "github:SociOS-Linux/source-os#builder-aarch64",
+  "durationMs": 0,
+  "issuedAt": "2026-06-16T00:00:00Z",
+  "auditId": "urn:srcos:audit:builder-aarch64-2026-06-16T00:00:00Z-dry"
+}
diff --git a/examples/sync-cycle-receipt.json b/examples/sync-cycle-receipt.json
new file mode 100644
index 0000000..ac89552
--- /dev/null
+++ b/examples/sync-cycle-receipt.json
@@ -0,0 +1,37 @@
+{
+  "id": "urn:srcos:sync-receipt:builder-aarch64-2026-06-16T00:00:00Z-001",
+  "type": "SyncCycleReceipt",
+  "specVersion": "0.1.0",
+  "cycleId": "cycle-builder-aarch64-20260616-001",
+  "engineId": "sourceos.sync.katello-content",
+  "org": "SocioProphet",
+  "contentView": "sourceos-builder-aarch64",
+  "fromVersion": null,
+  "toVersion": "1.0",
+  "lifecycleEnv": "dev",
+  "locus": "local",
+  "outcome": "applied",
+  "policyGate": "allowed",
+  "policyReason": "locus 'local' is in ALLOWED_LOCI",
+  "steps": [
+    {
+      "step": "nix copy --from http://127.0.0.1:8101 github:SociOS-Linux/source-os#builder-aarch64",
+      "status": "ok",
+      "returncode": 0,
+      "stdout": "copying 12 paths...",
+      "stderr": ""
+    },
+    {
+      "step": "nixos-rebuild switch --flake github:SociOS-Linux/source-os#builder-aarch64",
+      "status": "ok",
+      "returncode": 0,
+      "stdout": "activating configuration...",
+      "stderr": ""
+    }
+  ],
+  "nixCacheUrl": "http://127.0.0.1:8101",
+  "flakeRef": "github:SociOS-Linux/source-os#builder-aarch64",
+  "durationMs": 47200,
+  "issuedAt": "2026-06-16T00:00:00Z",
+  "auditId": "urn:srcos:audit:builder-aarch64-2026-06-16T00:00:00Z-001"
+}
diff --git a/schemas/SyncCycleReceipt.json b/schemas/SyncCycleReceipt.json
new file mode 100644
index 0000000..81ba0fe
--- /dev/null
+++ b/schemas/SyncCycleReceipt.json
@@ -0,0 +1,123 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://schemas.srcos.ai/v2/SyncCycleReceipt.json",
+  "title": "SyncCycleReceipt",
+  "description": "Immutable receipt emitted after a content sync cycle is planned or applied. Captures the before/after content view versions, steps executed, outcome, and audit reference. Owned by SourceOS-Linux/sourceos-syncd.",
+  "type": "object",
+  "required": [
+    "id",
+    "type",
+    "specVersion",
+    "cycleId",
+    "engineId",
+    "org",
+    "contentView",
+    "toVersion",
+    "lifecycleEnv",
+    "locus",
+    "outcome",
+    "steps",
+    "issuedAt",
+    "auditId"
+  ],
+  "additionalProperties": false,
+  "properties": {
+    "id": {
+      "type": "string",
+      "pattern": "^urn:srcos:sync-receipt:",
+      "description": "Globally unique receipt identifier."
+    },
+    "type": {
+      "const": "SyncCycleReceipt"
+    },
+    "specVersion": {
+      "type": "string",
+      "description": "sourceos-spec version this receipt was emitted against."
+    },
+    "cycleId": {
+      "type": "string",
+      "description": "Correlation ID for the sync cycle; may span plan + apply."
+    },
+    "engineId": {
+      "type": "string",
+      "pattern": "^sourceos\\.sync\\.",
+      "description": "SyncEngineManifest engineId that produced this receipt."
+    },
+    "org": {
+      "type": "string",
+      "description": "Katello organization name."
+    },
+    "contentView": {
+      "type": "string",
+      "description": "Katello content view name (e.g. sourceos-builder-aarch64)."
+    },
+    "fromVersion": {
+      "type": ["string", "null"],
+      "description": "Content view version before the sync; null on first sync."
+    },
+    "toVersion": {
+      "type": "string",
+      "description": "Content view version targeted by this sync."
+    },
+    "lifecycleEnv": {
+      "type": "string",
+      "description": "Katello lifecycle environment (dev, candidate, stable)."
+    },
+    "locus": {
+      "enum": ["local", "trusted_private", "attested_fog", "burst_cloud"],
+      "description": "Execution locus at which the sync was authorized."
+    },
+    "outcome": {
+      "enum": ["planned", "dry_run", "applied", "skipped", "denied", "failed"],
+      "description": "Result of the sync cycle."
+    },
+    "policyGate": {
+      "type": "string",
+      "description": "Policy gate value from the ContentSyncPlan (allowed, denied, no-op)."
+    },
+    "policyReason": {
+      "type": "string",
+      "description": "Human-readable reason for the policy gate decision."
+    },
+    "steps": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "required": ["step", "status"],
+        "additionalProperties": false,
+        "properties": {
+          "step": { "type": "string" },
+          "status": {
+            "enum": ["dry_run", "ok", "failed", "skipped", "timeout"]
+          },
+          "returncode": { "type": "integer" },
+          "stdout": { "type": "string" },
+          "stderr": { "type": "string" },
+          "reason": { "type": "string" }
+        }
+      }
+    },
+    "nixCacheUrl": {
+      "type": "string",
+      "description": "Pulp content server URL used as the Nix binary cache."
+    },
+    "flakeRef": {
+      "type": "string",
+      "description": "NixOS flake ref passed to nixos-rebuild."
+    },
+    "durationMs": {
+      "type": "integer",
+      "minimum": 0,
+      "description": "Wall-clock duration of the sync execution in milliseconds."
+    },
+    "issuedAt": {
+      "type": "string",
+      "format": "date-time"
+    },
+    "auditId": {
+      "type": "string",
+      "pattern": "^urn:srcos:audit:",
+      "description": "AuditEvent id that records this sync cycle in the append-only audit log."
+    }
+  }
+}
diff --git a/tools/validate_sync_cycle_receipts.py b/tools/validate_sync_cycle_receipts.py
new file mode 100644
index 0000000..dc4b873
--- /dev/null
+++ b/tools/validate_sync_cycle_receipts.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import jsonschema
+
+ROOT = Path(__file__).resolve().parents[1]
+PAIRS = [
+    (ROOT / "schemas" / "SyncCycleReceipt.json", ROOT / "examples" / "sync-cycle-receipt.json"),
+    (ROOT / "schemas" / "SyncCycleReceipt.json", ROOT / "examples" / "sync-cycle-receipt.dry-run.json"),
+]
+
+
+def validate_pair(schema_path: Path, example_path: Path) -> None:
+    schema = json.loads(schema_path.read_text(encoding="utf-8"))
+    jsonschema.validators.validator_for(schema).check_schema(schema)
+    example = json.loads(example_path.read_text(encoding="utf-8"))
+    jsonschema.validate(example, schema)
+
+
+def main() -> int:
+    checks: dict[str, bool] = {}
+    for schema_path, example_path in PAIRS:
+        validate_pair(schema_path, example_path)
+        checks[example_path.name] = True
+    print(json.dumps({"ok": all(checks.values()), "checks": checks}, indent=2, sort_keys=True))
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())