feat: enable SIWX sign-in for the TRON adapter

.changeset/tron-siwx-sign-message.md

@@ -0,0 +1,5 @@
+---
+'@reown/appkit-adapter-tron': patch
+---
+
+Implement message signing in the TRON adapter. `TronAdapter.signMessage` previously returned an empty signature, which broke SIWX / Reown Authentication (the empty signature was rejected by the server). It now delegates to the active connector's `signMessage`, producing a real signature.

apps/laboratory/src/components/DemoContent.tsx

@@ -88,6 +88,14 @@ export default function DemoContent({
           showActions={false}
         />
       ) : null}
+      {tronAdapter ? (
+        <AppKitWalletButtons
+          title="TRON Wallet Buttons"
+          namespace={isMultiChain ? 'tron' : undefined}
+          wallets={ConstantsUtil.TronWalletButtons}
+          showActions={false}
+        />
+      ) : null}
     </>
   )
 }

apps/laboratory/src/constants/appKitConfigs.ts

@@ -391,7 +391,7 @@ export const appKitConfigs = {
   },
   'reown-authentication': {
     ...commonAppKitConfig,
-    adapters: ['ethers', 'solana', 'bitcoin'],
+    adapters: ['ethers', 'solana', 'bitcoin', 'tron'],
     networks: ConstantsUtil.AllNetworks,
     siwx: new ReownAuthentication(),
     siwxReown: true

apps/laboratory/src/utils/ConstantsUtil.ts

@@ -212,6 +212,7 @@ export const ConstantsUtil = {
     'frontier'
   ] as Wallet[],
   BitcoinWalletButtons: ['walletConnect', 'xverse', 'leather', 'okx', 'phantom'] as Wallet[],
+  TronWalletButtons: ['walletConnect'] as Wallet[],
   Socials: [
     'google',
     'github',

packages/adapters/tron/src/adapter.ts

@@ -143,8 +143,21 @@ export class TronAdapter extends AdapterBlueprint<TronConnector> {
     })
   }
 
-  override async signMessage(): Promise<AdapterBlueprint.SignMessageResult> {
-    return Promise.resolve({ signature: '' })
+  override async signMessage(
+    params: AdapterBlueprint.SignMessageParams
+  ): Promise<AdapterBlueprint.SignMessageResult> {
+    const connector = (params.provider as TronConnector | undefined) ?? this.getActiveConnector()
+
+    if (!connector) {
+      throw new Error('TronAdapter:signMessage - connector is undefined')
+    }
+
+    const signature = await connector.signMessage({
+      message: params.message,
+      from: params.address
+    })
+
+    return { signature }
   }
 
   override async sendTransaction(): Promise<AdapterBlueprint.SendTransactionResult> {