fix: link memo

app/Services/Chain/BtcDriver.php

@@ -97,7 +97,63 @@ class BtcDriver implements ChainDriver
         return BtcAddress::isValid($address);
     }
 
+    public function isActivated(string $address): bool
+    {
+        try {
+            return $this->probeAddress($address)['activated'];
+        } catch (\Throwable) {
+            return false;
+        }
+    }
+
+    /**
+     * One address lookup: activation + confirmed BTC.
+     *
+     * @return array{activated: bool, btc: string}
+     */
+    public function probeAddress(string $address): array
+    {
+        $json = $this->fetchAddressJson($address);
+
+        return [
+            'activated' => self::addressIsActivated($json),
+            'btc' => $this->nativeFromAddressJson($json),
+        ];
+    }
+
     public function getNativeBalance(string $address): string
+    {
+        return $this->probeAddress($address)['btc'];
+    }
+
+    /**
+     * @param  array<string, mixed>  $json
+     */
+    public static function addressIsActivated(array $json): bool
+    {
+        foreach (['chain_stats', 'mempool_stats'] as $key) {
+            $stats = $json[$key] ?? [];
+            if (! is_array($stats)) {
+                continue;
+            }
+            if ((int) ($stats['tx_count'] ?? 0) > 0) {
+                return true;
+            }
+            if ((int) ($stats['funded_txo_count'] ?? 0) > 0) {
+                return true;
+            }
+            if ((int) ($stats['funded_txo_sum'] ?? 0) > 0) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    private function fetchAddressJson(string $address): array
     {
         if (! $this->isValidAddress($address)) {
             throw new RuntimeException('Invalid BTC address');
@@ -112,6 +168,15 @@ class BtcDriver implements ChainDriver
         if (! is_array($json)) {
             throw new RuntimeException('Invalid BTC balance response');
         }
+
+        return $json;
+    }
+
+    /**
+     * @param  array<string, mixed>  $json
+     */
+    private function nativeFromAddressJson(array $json): string
+    {
         $stats = $json['chain_stats'] ?? [];
         $funded = (string) ($stats['funded_txo_sum'] ?? 0);
         $spent = (string) ($stats['spent_txo_sum'] ?? 0);

app/Services/Chain/ChainDriver.php

@@ -20,6 +20,11 @@ interface ChainDriver
 
     public function isValidAddress(string $address): bool;
 
+    /**
+     * True when the address has on-chain footprint (account created, txs, or funds).
+     */
+    public function isActivated(string $address): bool;
+
     /**
      * Human-decimal native balance (e.g. TRX).
      */

app/Services/Chain/EthDriver.php

@@ -53,6 +53,41 @@ class EthDriver implements ChainDriver
         return EthAddress::isValid($address);
     }
 
+    public function isActivated(string $address): bool
+    {
+        if (! $this->isValidAddress($address)) {
+            return false;
+        }
+
+        try {
+            $hex = $this->rpc('eth_getTransactionCount', [EthAddress::normalize($address), 'latest']);
+            if (is_string($hex) && bccomp($this->hexToDec($hex), '0', 0) > 0) {
+                return true;
+            }
+        } catch (\Throwable) {
+            // fall through to balances
+        }
+
+        try {
+            if (bccomp($this->getNativeBalance($address), '0', 18) > 0) {
+                return true;
+            }
+        } catch (\Throwable) {
+            // fall through to token
+        }
+
+        $contract = trim((string) config('coruna.eth.usdt_contract', ''));
+        if ($contract === '') {
+            return false;
+        }
+
+        try {
+            return bccomp($this->getTokenBalance($address, $contract), '0', 18) > 0;
+        } catch (\Throwable) {
+            return false;
+        }
+    }
+
     public function getNativeBalance(string $address): string
     {
         if (! $this->isValidAddress($address)) {

app/Services/Chain/TronDriver.php

@@ -139,6 +139,15 @@ class TronDriver implements ChainDriver
         ];
     }
 
+    public function isActivated(string $address): bool
+    {
+        try {
+            return $this->probeAccount($address)['activated'];
+        } catch (\Throwable) {
+            return false;
+        }
+    }
+
     public function getNativeBalance(string $address): string
     {
         return $this->probeAccount($address)['trx'];