diff --git a/src/constants.ts b/src/constants.ts
index a1b05e6b..c99b8e47 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -28,3 +28,11 @@ export const JWT_IGNORE_URLS = ['/token', '/docs', '/cron', '/internal', '/healt
 export const SWAGGER_PROD_IGNORE_URLS = isAdminMode ? ['/token', '/cron'] : ['/cron'];
 
 export const VERCEL_MAX_DURATION = 300;
+
+// estimate time: 2024-04-03 09:45:17
+// ref: https://mempool.space/testnet/block/000000000000000493ba5eebf0602f3e0e5381dd35f763a62ca7ea135343a0d6
+export const BTC_TESTNET_SPV_START_BLOCK_HEIGHT = 2584900;
+
+// estimate time: 2024-04-02 06:20:03
+// ref: https://mempool.space/block/0000000000000000000077d98a103858c7d7cbc5ba67a4135f348a436bec1748
+export const BTC_MAINNET_SPV_START_BLOCK_HEIGHT = 837300;
diff --git a/src/services/unlocker.ts b/src/services/unlocker.ts
index 623948c2..38d10aa4 100644
--- a/src/services/unlocker.ts
+++ b/src/services/unlocker.ts
@@ -17,7 +17,7 @@ import {
 import { btcTxIdFromBtcTimeLockArgs } from '@rgbpp-sdk/ckb/lib/utils/rgbpp';
 import { BtcAssetsApi } from '@rgbpp-sdk/service';
 import { Cradle } from '../container';
-import { TestnetTypeMap } from '../constants';
+import { BTC_MAINNET_SPV_START_BLOCK_HEIGHT, BTC_TESTNET_SPV_START_BLOCK_HEIGHT, TestnetTypeMap } from '../constants';
 
 interface IUnlocker {
   getNextBatchLockCell(): Promise<IndexerCell[]>;
@@ -54,6 +54,10 @@ export default class Unlocker implements IUnlocker {
     return getBtcTimeLockScript(this.isMainnet, this.testnetType);
   }
 
+  private get btcSpvStartBlockHeight() {
+    return this.isMainnet ? BTC_MAINNET_SPV_START_BLOCK_HEIGHT : BTC_TESTNET_SPV_START_BLOCK_HEIGHT;
+  }
+
   /**
    * Get next batch of BTC time lock cells
    */
@@ -73,6 +77,11 @@ export default class Unlocker implements IUnlocker {
       const btcTx = await this.cradle.bitcoin.getTx({ txid: btcTxid });
       const blockHeight = btcTx.status.block_height;
 
+      // skip if the block height of the btc txid is less than the BTC SPV start block height
+      if (blockHeight && blockHeight < this.btcSpvStartBlockHeight) {
+        continue;
+      }
+
       // skip if btc tx not confirmed $after blocks yet
       if (!blockHeight || blocks - blockHeight < after) {
         continue;