Fix receive and send

src/services/electrum.ts

@@ -0,0 +1,46 @@
+import { fetchTransactionBlockHeight, initializeElectrumClient } from '@electrum-cash/protocol';
+
+export interface ElectrumServiceConfig {
+  host?: string;
+  applicationIdentifier?: string;
+}
+
+/**
+ * Small Electrum adapter used by CLI services.
+ * Keeps connection logic in one place and exposes a tiny API.
+ */
+export class ElectrumService {
+  private readonly host: string;
+  private readonly applicationIdentifier: string;
+  private clientPromise?: ReturnType<typeof initializeElectrumClient>;
+
+  constructor(config: ElectrumServiceConfig = {}) {
+    this.host = config.host ?? process.env['ELECTRUM_HOST'] ?? 'bch.imaginary.cash';
+    this.applicationIdentifier = 'xo-cli';
+  }
+
+  private async getClient() {
+    if (!this.clientPromise) {
+      this.clientPromise = initializeElectrumClient(this.applicationIdentifier, this.host);
+    }
+
+    return this.clientPromise;
+  }
+
+  /**
+   * Returns true when the transaction is known by Electrum
+   * (confirmed or currently in mempool).
+   */
+  async hasSeenTransaction(transactionHash: string): Promise<boolean> {
+    try {
+      const client = await this.getClient();
+      const height = await fetchTransactionBlockHeight(client, transactionHash);
+
+      // Electrum returns numbers for known transactions
+      // (e.g. >0 confirmed, 0/-1 unconfirmed variants).
+      return typeof height === 'number';
+    } catch {
+      return false;
+    }
+  }
+}