diff --git a/core/sidra-chain/chain.js b/core/sidra-chain/chain.js
index d2508a6..e465461 100644
--- a/core/sidra-chain/chain.js
+++ b/core/sidra-chain/chain.js
@@ -1,24 +1,35 @@
-import { SidraProtocol } from './protocol';
 import { Block } from './block';
 
 class SidraChain {
   constructor() {
-    this.chain = [];
-    this.currentBlock = null;
-    this.protocol = new SidraProtocol(this, new SidraNode());
+    this.blocks = [];
   }
 
-  init() {
-    // Initialize the chain with a genesis block
+  addBlock(block) {
+    // Validate the block before adding it to the chain
+    if (this.validateBlock(block)) {
+      this.blocks.push(block);
+    }
   }
 
-  createBlock(transactions) {
-    const block = new Block(transactions, this.currentBlock.hash);
-    this.protocol.createBlock(block);
+  getLatestBlock() {
+    // Return the latest block in the chain
+    return this.blocks[this.blocks.length - 1];
   }
 
-  processTransaction(transaction) {
-    this.protocol.processTransaction(transaction);
+  getBlockByHash(hash) {
+    // Retrieve a block by its hash
+    return this.blocks.find((block) => block.hash === hash);
+  }
+
+  getBlockByIndex(index) {
+    // Retrieve a block by its index
+    return this.blocks[index];
+  }
+
+  validateBlock(block) {
+    // Validate a block and ensure it meets the chain's requirements
+    // Check block hash, transactions, and other relevant information
   }
 }