feat: deserialize signed CIP-8 message hex

TICKET: COIN-6327

Author: bhavidhingra

examples/ts/ada/deserialize-signed-cip-8-message-hex.ts

@@ -0,0 +1,36 @@
+/**
+ * Deserialize a signed CIP-8 message from an MPC wallet at BitGo.
+ *
+ * Copyright 2025, BitGo, Inc. All Rights Reserved.
+ */
+import { BaseCoin } from "@bitgo/statics";
+import { MessageBuilderFactory, bufferToCoseObjectsOutput } from "@bitgo/sdk-coin-ada";
+
+async function deserializeSignedCip8MessageHex(): Promise<void> {
+    const signedMsgHex = '';
+
+    const coinConfig = { name: 'ada' } as BaseCoin;
+    const factory = new MessageBuilderFactory(coinConfig);
+    const builder = factory.fromBroadcastString(signedMsgHex);
+    const message = await builder.build();
+
+    const payload = message.getPayload();
+    console.log(`Message: ${payload}`);
+
+    const address = message.getSigners()[0];
+    console.log(`Signer address: ${address}`);
+
+    const signature = message.getSignatures()[0].signature;
+    const publicKeyHex = message.getSignatures()[0].publicKey.pub;
+    console.log(`Public key hex: ${publicKeyHex}`);
+
+    const coseObjectsOutput = await bufferToCoseObjectsOutput(signature);
+
+    const coseKey = coseObjectsOutput.manualCoseKeyHex;
+    console.log(`Cose key: ${coseKey}`);
+
+    const coseSign1 = coseObjectsOutput.manualCoseSign1Hex;
+    console.log(`Cose sign1: ${coseSign1}`);
+}
+
+deserializeSignedCip8MessageHex().catch(console.error);

modules/sdk-coin-ada/src/lib/messages/cip8/index.ts

@@ -1,2 +1,3 @@
 export * from './cip8Message';
 export * from './cip8MessageBuilder';
+export * from './utils';