Make Blockchain from methods inheritable

packages/stack/src/blockchain/blockchain-electrum.ts

@@ -109,17 +109,18 @@ export class BlockchainElectrum extends BaseBlockchain<
 
   /**
    * Creates a new BlockchainElectrum instance.
-   * @param {BlockchainElectrumParams} params - The parameters for the BlockchainElectrum instance.
-   * @returns {BlockchainElectrum} A new BlockchainElectrum instance.
+   * @param params - The parameters for the BlockchainElectrum instance.
+   * @returns A new BlockchainElectrum instance.
    */
-  static async from(
+  static async from<T extends typeof BlockchainElectrum>(
+    this: T,
     params: BlockchainElectrumParams = {},
-  ): Promise<BlockchainElectrum> {
-    const blockchain = new BlockchainElectrum(params);
+  ) {
+    const blockchain = new this(params);
 
     await blockchain.start();
 
-    return blockchain;
+    return blockchain as InstanceType<T>;
   }
 
   async start() {

packages/stack/src/blockchain/blockchain-inmemory.ts

@@ -24,8 +24,10 @@ import {
 // Local Blockchain Adapter.
 // This simulates the BCH Blockchain.
 export class BlockchainInMemory extends BaseBlockchain {
-  static from() {
-    return new BlockchainInMemory();
+  static async from<T extends typeof BlockchainInMemory>(this: T) {
+    const blockchain = new this();
+    await blockchain.start();
+    return blockchain as InstanceType<T>;
   }
 
   private transactions: BlockchainTransactions;