diff --git a/app/modules/ws2p/lib/constants.ts b/app/modules/ws2p/lib/constants.ts
index 8338f8dbf5406781b7c98dfe42f2b699bdb7da02..51972d7f7d1dca2c5406d8f7af8fea58bfe740a0 100644
--- a/app/modules/ws2p/lib/constants.ts
+++ b/app/modules/ws2p/lib/constants.ts
@@ -30,7 +30,7 @@ export const WS2PConstants = {
     + CommonConstants.FORMATS.BLOCKSTAMP
     + '$'),
 
-  HEAD_V1_REGEXP: new RegExp('^WS2P(?:TOR)?:HEAD:1:'
+  HEAD_V1_REGEXP: new RegExp('^WS2P(?:O[CT][SAM])?(?:I[CT])?:HEAD:1:'
   + '(' + CommonConstants.FORMATS.PUBKEY + '):'
   + '(' + CommonConstants.FORMATS.BLOCKSTAMP + '):'
   + '(' + CommonConstants.FORMATS.WS2PID + '):'