diff --git a/examples/event-processor-bleeps/CHANGELOG.md b/examples/event-processor-bleeps/CHANGELOG.md
index 24bedf4..4c2dff0 100644
--- a/examples/event-processor-bleeps/CHANGELOG.md
+++ b/examples/event-processor-bleeps/CHANGELOG.md
@@ -1,5 +1,11 @@
 # event-processor-bleeps
 
+## 0.0.44
+
+### Patch Changes
+
+- ethereum-indexer-js-processor@0.6.18
+
 ## 0.0.43
 
 ### Patch Changes
diff --git a/examples/event-processor-bleeps/package.json b/examples/event-processor-bleeps/package.json
index 15addd5..3c81f9b 100644
--- a/examples/event-processor-bleeps/package.json
+++ b/examples/event-processor-bleeps/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "event-processor-bleeps",
 	"private": true,
-	"version": "0.0.43",
+	"version": "0.0.44",
 	"description": "",
 	"type": "module",
 	"main": "dist/index.cjs",
diff --git a/examples/event-processor-conquest-eth/CHANGELOG.md b/examples/event-processor-conquest-eth/CHANGELOG.md
index bd20c98..6add043 100644
--- a/examples/event-processor-conquest-eth/CHANGELOG.md
+++ b/examples/event-processor-conquest-eth/CHANGELOG.md
@@ -1,5 +1,11 @@
 # event-processor-conquest-eth
 
+## 0.0.44
+
+### Patch Changes
+
+- ethereum-indexer-js-processor@0.6.18
+
 ## 0.0.43
 
 ### Patch Changes
diff --git a/examples/event-processor-conquest-eth/package.json b/examples/event-processor-conquest-eth/package.json
index 7e6b679..0084b5b 100644
--- a/examples/event-processor-conquest-eth/package.json
+++ b/examples/event-processor-conquest-eth/package.json
@@ -1,7 +1,7 @@
 {
   "name": "event-processor-conquest-eth",
   "private": true,
-  "version": "0.0.43",
+  "version": "0.0.44",
   "description": "",
   "type": "module",
   "main": "dist/index.cjs",
diff --git a/examples/event-processor-conquest-fplay/CHANGELOG.md b/examples/event-processor-conquest-fplay/CHANGELOG.md
index f1ecb9e..dca5599 100644
--- a/examples/event-processor-conquest-fplay/CHANGELOG.md
+++ b/examples/event-processor-conquest-fplay/CHANGELOG.md
@@ -1,5 +1,11 @@
 # event-processor-conquest-fplay
 
+## 0.0.44
+
+### Patch Changes
+
+- ethereum-indexer-js-processor@0.6.18
+
 ## 0.0.43
 
 ### Patch Changes
diff --git a/examples/event-processor-conquest-fplay/package.json b/examples/event-processor-conquest-fplay/package.json
index 1e857aa..29f2f06 100644
--- a/examples/event-processor-conquest-fplay/package.json
+++ b/examples/event-processor-conquest-fplay/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "event-processor-conquest-fplay",
 	"private": true,
-	"version": "0.0.43",
+	"version": "0.0.44",
 	"description": "",
 	"type": "module",
 	"main": "dist/index.cjs",
diff --git a/examples/event-processor-nfts/CHANGELOG.md b/examples/event-processor-nfts/CHANGELOG.md
index 35927e5..f67e20a 100644
--- a/examples/event-processor-nfts/CHANGELOG.md
+++ b/examples/event-processor-nfts/CHANGELOG.md
@@ -1,5 +1,11 @@
 # event-processor-nfts
 
+## 0.0.44
+
+### Patch Changes
+
+- ethereum-indexer-js-processor@0.6.18
+
 ## 0.0.43
 
 ### Patch Changes
diff --git a/examples/event-processor-nfts/package.json b/examples/event-processor-nfts/package.json
index f85331e..8420b8c 100644
--- a/examples/event-processor-nfts/package.json
+++ b/examples/event-processor-nfts/package.json
@@ -1,7 +1,7 @@
 {
   "name": "event-processor-nfts",
   "private": true,
-  "version": "0.0.43",
+  "version": "0.0.44",
   "description": "",
   "type": "module",
   "main": "dist/index.cjs",
diff --git a/examples/mud/CHANGELOG.md b/examples/mud/CHANGELOG.md
index bda0a70..8c50bef 100644
--- a/examples/mud/CHANGELOG.md
+++ b/examples/mud/CHANGELOG.md
@@ -1,5 +1,17 @@
 # web-demo
 
+## 0.1.43
+
+### Patch Changes
+
+- Updated dependencies
+  - ethereum-indexer@0.6.13
+  - ethereum-indexer-browser@0.6.15
+  - ethereum-indexer-js-processor@0.6.18
+  - event-processor-bleeps@0.0.44
+  - event-processor-conquest-eth@0.0.44
+  - event-processor-nfts@0.0.44
+
 ## 0.1.42
 
 ### Patch Changes
diff --git a/examples/mud/package.json b/examples/mud/package.json
index dc162d1..2817921 100644
--- a/examples/mud/package.json
+++ b/examples/mud/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "mud-demo",
 	"private": true,
-	"version": "0.1.42",
+	"version": "0.1.43",
 	"type": "module",
 	"scripts": {
 		"dev": "vite",
diff --git a/examples/web-demo/CHANGELOG.md b/examples/web-demo/CHANGELOG.md
index b7e5921..6f7d0a0 100644
--- a/examples/web-demo/CHANGELOG.md
+++ b/examples/web-demo/CHANGELOG.md
@@ -1,5 +1,16 @@
 # web-demo
 
+## 0.1.43
+
+### Patch Changes
+
+- Updated dependencies
+  - ethereum-indexer@0.6.13
+  - ethereum-indexer-browser@0.6.15
+  - event-processor-bleeps@0.0.44
+  - event-processor-conquest-eth@0.0.44
+  - event-processor-nfts@0.0.44
+
 ## 0.1.42
 
 ### Patch Changes
diff --git a/examples/web-demo/package.json b/examples/web-demo/package.json
index c71c25f..195b8d1 100644
--- a/examples/web-demo/package.json
+++ b/examples/web-demo/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "web-demo",
 	"private": true,
-	"version": "0.1.42",
+	"version": "0.1.43",
 	"type": "module",
 	"scripts": {
 		"dev": "vite",
diff --git a/packages/ethereum-indexer-browser/CHANGELOG.md b/packages/ethereum-indexer-browser/CHANGELOG.md
index 4a21caa..77bf69c 100644
--- a/packages/ethereum-indexer-browser/CHANGELOG.md
+++ b/packages/ethereum-indexer-browser/CHANGELOG.md
@@ -1,5 +1,12 @@
 # ethereum-indexer-browser
 
+## 0.6.15
+
+### Patch Changes
+
+- Updated dependencies
+  - ethereum-indexer@0.6.13
+
 ## 0.6.14
 
 ### Patch Changes
diff --git a/packages/ethereum-indexer-browser/package.json b/packages/ethereum-indexer-browser/package.json
index bce4549..93349af 100644
--- a/packages/ethereum-indexer-browser/package.json
+++ b/packages/ethereum-indexer-browser/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "ethereum-indexer-browser",
-	"version": "0.6.14",
+	"version": "0.6.15",
 	"publishConfig": {
 		"access": "public"
 	},
diff --git a/packages/ethereum-indexer-cli/CHANGELOG.md b/packages/ethereum-indexer-cli/CHANGELOG.md
index 478dbc7..43c6c11 100644
--- a/packages/ethereum-indexer-cli/CHANGELOG.md
+++ b/packages/ethereum-indexer-cli/CHANGELOG.md
@@ -1,5 +1,13 @@
 # ethereum-indexer-cli
 
+## 0.6.18
+
+### Patch Changes
+
+- Updated dependencies
+  - ethereum-indexer-utils@0.6.11
+  - ethereum-indexer@0.6.13
+
 ## 0.6.17
 
 ### Patch Changes
diff --git a/packages/ethereum-indexer-cli/package.json b/packages/ethereum-indexer-cli/package.json
index 342f708..171d071 100644
--- a/packages/ethereum-indexer-cli/package.json
+++ b/packages/ethereum-indexer-cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ethereum-indexer-cli",
-  "version": "0.6.17",
+  "version": "0.6.18",
   "description": "",
   "keywords": [],
   "author": "",
diff --git a/packages/ethereum-indexer-db-processors/CHANGELOG.md b/packages/ethereum-indexer-db-processors/CHANGELOG.md
index 5c1bd2b..fe00db4 100644
--- a/packages/ethereum-indexer-db-processors/CHANGELOG.md
+++ b/packages/ethereum-indexer-db-processors/CHANGELOG.md
@@ -1,5 +1,13 @@
 # ethereum-indexer-db-processors
 
+## 0.6.13
+
+### Patch Changes
+
+- Updated dependencies
+  - ethereum-indexer@0.6.13
+  - ethereum-indexer-db-utils@0.6.13
+
 ## 0.6.12
 
 ### Patch Changes
diff --git a/packages/ethereum-indexer-db-processors/package.json b/packages/ethereum-indexer-db-processors/package.json
index facb0d3..082edf8 100644
--- a/packages/ethereum-indexer-db-processors/package.json
+++ b/packages/ethereum-indexer-db-processors/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "ethereum-indexer-db-processors",
-	"version": "0.6.12",
+	"version": "0.6.13",
 	"description": "",
 	"publishConfig": {
 		"access": "public"
diff --git a/packages/ethereum-indexer-db-utils/CHANGELOG.md b/packages/ethereum-indexer-db-utils/CHANGELOG.md
index e42211b..66fa4fa 100644
--- a/packages/ethereum-indexer-db-utils/CHANGELOG.md
+++ b/packages/ethereum-indexer-db-utils/CHANGELOG.md
@@ -1,5 +1,12 @@
 # ethereum-indexer-db-utils
 
+## 0.6.13
+
+### Patch Changes
+
+- Updated dependencies
+  - ethereum-indexer@0.6.13
+
 ## 0.6.12
 
 ### Patch Changes
diff --git a/packages/ethereum-indexer-db-utils/package.json b/packages/ethereum-indexer-db-utils/package.json
index 95981c0..e1ad408 100644
--- a/packages/ethereum-indexer-db-utils/package.json
+++ b/packages/ethereum-indexer-db-utils/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "ethereum-indexer-db-utils",
-	"version": "0.6.12",
+	"version": "0.6.13",
 	"description": "",
 	"publishConfig": {
 		"access": "public"
diff --git a/packages/ethereum-indexer-fs-cache/CHANGELOG.md b/packages/ethereum-indexer-fs-cache/CHANGELOG.md
index d2ecd6e..0046b68 100644
--- a/packages/ethereum-indexer-fs-cache/CHANGELOG.md
+++ b/packages/ethereum-indexer-fs-cache/CHANGELOG.md
@@ -1,5 +1,12 @@
 # ethereum-indexer-fs-event-store
 
+## 0.6.13
+
+### Patch Changes
+
+- Updated dependencies
+  - ethereum-indexer@0.6.13
+
 ## 0.6.12
 
 ### Patch Changes
diff --git a/packages/ethereum-indexer-fs-cache/package.json b/packages/ethereum-indexer-fs-cache/package.json
index ca9f6b4..5429bb8 100644
--- a/packages/ethereum-indexer-fs-cache/package.json
+++ b/packages/ethereum-indexer-fs-cache/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ethereum-indexer-fs-cache",
-  "version": "0.6.12",
+  "version": "0.6.13",
   "description": "",
   "publishConfig": {
     "access": "public"
diff --git a/packages/ethereum-indexer-js-processor/CHANGELOG.md b/packages/ethereum-indexer-js-processor/CHANGELOG.md
index 339114c..5a3fc96 100644
--- a/packages/ethereum-indexer-js-processor/CHANGELOG.md
+++ b/packages/ethereum-indexer-js-processor/CHANGELOG.md
@@ -1,5 +1,12 @@
 # ethereum-indexer-js-processor
 
+## 0.6.18
+
+### Patch Changes
+
+- Updated dependencies
+  - ethereum-indexer@0.6.13
+
 ## 0.6.17
 
 ### Patch Changes
diff --git a/packages/ethereum-indexer-js-processor/package.json b/packages/ethereum-indexer-js-processor/package.json
index 723755c..b141861 100644
--- a/packages/ethereum-indexer-js-processor/package.json
+++ b/packages/ethereum-indexer-js-processor/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "ethereum-indexer-js-processor",
-	"version": "0.6.17",
+	"version": "0.6.18",
 	"description": "",
 	"keywords": [],
 	"author": "",
diff --git a/packages/ethereum-indexer-server/CHANGELOG.md b/packages/ethereum-indexer-server/CHANGELOG.md
index 635586a..4c53390 100644
--- a/packages/ethereum-indexer-server/CHANGELOG.md
+++ b/packages/ethereum-indexer-server/CHANGELOG.md
@@ -1,5 +1,15 @@
 # ethereum-indexer-server
 
+## 0.6.21
+
+### Patch Changes
+
+- Updated dependencies
+  - ethereum-indexer-utils@0.6.11
+  - ethereum-indexer@0.6.13
+  - ethereum-indexer-db-utils@0.6.13
+  - ethereum-indexer-fs-cache@0.6.13
+
 ## 0.6.20
 
 ### Patch Changes
diff --git a/packages/ethereum-indexer-server/package.json b/packages/ethereum-indexer-server/package.json
index 801c04d..2c692b4 100644
--- a/packages/ethereum-indexer-server/package.json
+++ b/packages/ethereum-indexer-server/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "ethereum-indexer-server",
-	"version": "0.6.20",
+	"version": "0.6.21",
 	"description": "",
 	"keywords": [],
 	"author": "",
diff --git a/packages/ethereum-indexer-streams/CHANGELOG.md b/packages/ethereum-indexer-streams/CHANGELOG.md
index e2048ed..cfb64a6 100644
--- a/packages/ethereum-indexer-streams/CHANGELOG.md
+++ b/packages/ethereum-indexer-streams/CHANGELOG.md
@@ -1,5 +1,13 @@
 # ethereum-indexer-server
 
+## 0.6.18
+
+### Patch Changes
+
+- Updated dependencies
+  - ethereum-indexer-utils@0.6.11
+  - ethereum-indexer@0.6.13
+
 ## 0.6.17
 
 ### Patch Changes
diff --git a/packages/ethereum-indexer-streams/package.json b/packages/ethereum-indexer-streams/package.json
index 9f4a576..f27f10a 100644
--- a/packages/ethereum-indexer-streams/package.json
+++ b/packages/ethereum-indexer-streams/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "ethereum-indexer-streams",
-	"version": "0.6.17",
+	"version": "0.6.18",
 	"description": "",
 	"keywords": [],
 	"author": "",
diff --git a/packages/ethereum-indexer-utils/CHANGELOG.md b/packages/ethereum-indexer-utils/CHANGELOG.md
index 84ab62a..b932146 100644
--- a/packages/ethereum-indexer-utils/CHANGELOG.md
+++ b/packages/ethereum-indexer-utils/CHANGELOG.md
@@ -1,5 +1,11 @@
 # ethereum-indexer-utils
 
+## 0.6.11
+
+### Patch Changes
+
+- let specify genesisHash as source param, useful for local chain
+
 ## 0.6.10
 
 ### Patch Changes
diff --git a/packages/ethereum-indexer-utils/package.json b/packages/ethereum-indexer-utils/package.json
index 79dfe93..cf9815d 100644
--- a/packages/ethereum-indexer-utils/package.json
+++ b/packages/ethereum-indexer-utils/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "ethereum-indexer-utils",
-	"version": "0.6.10",
+	"version": "0.6.11",
 	"description": "",
 	"publishConfig": {
 		"access": "public"
diff --git a/packages/ethereum-indexer-utils/src/contracts.ts b/packages/ethereum-indexer-utils/src/contracts.ts
index 6bec5e5..3c1c9b6 100644
--- a/packages/ethereum-indexer-utils/src/contracts.ts
+++ b/packages/ethereum-indexer-utils/src/contracts.ts
@@ -40,6 +40,7 @@ export function loadContractsFromFile<ABI extends Abi>(file: string): IndexingSo
 			contracts: Object.keys(contracts.contracts).map(
 				(name) => (contracts as any).contracts[name],
 			),
+		genesisHash: contracts.genesisHash
 	}
 }
 
@@ -49,12 +50,20 @@ export function loadContractsFromFolder<ABI extends Abi>(folder: string): Indexi
 	const contractsAdded: {[address: string]: {index: number}} = {};
 	const contractsData: ContractData<ABI>[] = [];
 	const files = fs.readdirSync(folder);
-	let chainId = undefined;
+	let genesisHash: `0x${string}` | undefined = undefined;
+	let chainId: string | undefined = undefined;
 	for (const file of files) {
 		if (file === '.chainId') {
 			chainId = fs.readFileSync(path.join(folder, file), 'utf8');
 			continue;
 		}
+		if (file === '.chain') {
+			const str = fs.readFileSync(path.join(folder, file), 'utf8');
+			const {chainId: chainIdFromFile, genesisHash: genesisHashFromFile} = JSON.parse(str);
+			chainId = chainIdFromFile;
+			genesisHash = genesisHashFromFile;
+			continue;
+		}
 		if (!file.endsWith('.json')) {
 			continue;
 		}
@@ -92,5 +101,6 @@ export function loadContractsFromFolder<ABI extends Abi>(folder: string): Indexi
 	return {
 		chainId,
 		contracts: contractsData,
+		genesisHash
 	};
 }
diff --git a/packages/ethereum-indexer/CHANGELOG.md b/packages/ethereum-indexer/CHANGELOG.md
index 66a3d6e..d6abe7f 100644
--- a/packages/ethereum-indexer/CHANGELOG.md
+++ b/packages/ethereum-indexer/CHANGELOG.md
@@ -1,5 +1,11 @@
 # ethereum-indexer
 
+## 0.6.13
+
+### Patch Changes
+
+- let specify genesisHash as source param, useful for local chain
+
 ## 0.6.12
 
 ### Patch Changes
diff --git a/packages/ethereum-indexer/package.json b/packages/ethereum-indexer/package.json
index 37048e7..4da81a4 100644
--- a/packages/ethereum-indexer/package.json
+++ b/packages/ethereum-indexer/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "ethereum-indexer",
-	"version": "0.6.12",
+	"version": "0.6.13",
 	"publishConfig": {
 		"access": "public"
 	},
diff --git a/packages/ethereum-indexer/src/indexer.ts b/packages/ethereum-indexer/src/indexer.ts
index e62137e..63ae444 100644
--- a/packages/ethereum-indexer/src/indexer.ts
+++ b/packages/ethereum-indexer/src/indexer.ts
@@ -296,6 +296,14 @@ export class EthereumIndexer<ABI extends Abi, ProcessResultType = void> {
 				`Connected to a different chain (chainId : ${chainId}). Expected chainId === ${this.source.chainId}`
 			);
 		}
+		if (this.source.genesisHash) {
+			const genesisHash = await this.provider.request({method: 'eth_getBlockByNumber'});
+			if (genesisHash !== this.source.genesisHash) {
+				throw new Error(
+					`Connected to a different chain (genesisHash: ${genesisHash}). Expected genesisHash === ${this.source.genesisHash}`
+				);
+			}	
+		}
 
 		let currentLastSync: LastSync<ABI> | undefined = undefined;
 		await this._onLoad('Loading');
diff --git a/packages/ethereum-indexer/src/types.ts b/packages/ethereum-indexer/src/types.ts
index eb8a630..9e4df39 100644
--- a/packages/ethereum-indexer/src/types.ts
+++ b/packages/ethereum-indexer/src/types.ts
@@ -80,6 +80,7 @@ export type AllContractData<ABI extends Abi> = {
 export type IndexingSource<ABI extends Abi> = {
 	readonly contracts: readonly ContractData<ABI>[] | AllContractData<ABI>;
 	readonly chainId: string;
+	readonly genesisHash?: `0x${string}`;
 };
 
 export type StreamFecther<ABI extends Abi> = (