diff --git a/sn_auditor/src/dag_db.rs b/sn_auditor/src/dag_db.rs
index f263c3b2dc..d287c1b81c 100644
--- a/sn_auditor/src/dag_db.rs
+++ b/sn_auditor/src/dag_db.rs
@@ -14,7 +14,9 @@ use color_eyre::eyre::{bail, eyre, Result};
 use graphviz_rust::{cmd::Format, exec, parse, printer::PrinterContext};
 use lazy_static::lazy_static;
 use serde::{Deserialize, Serialize};
-use sn_client::transfers::{Hash, NanoTokens, SignedSpend, SpendAddress};
+use sn_client::transfers::{
+    Hash, NanoTokens, SignedSpend, SpendAddress, DEFAULT_PAYMENT_FORWARD_SK,
+};
 use sn_client::{Client, SpendDag, SpendDagGet};
 use std::collections::{BTreeMap, BTreeSet};
 use std::fmt::Write;
@@ -356,8 +358,24 @@ impl SpendDagDb {
                 .or_default()
                 .insert((addr, amount));
         } else {
+            // check with default key
+            if let Some(default_user_name_hash) =
+                spend.reason().get_sender_hash(&DEFAULT_PAYMENT_FORWARD_SK)
+            {
+                if let Some(user_name) = beta_participants_read.get(&default_user_name_hash) {
+                    warn!("With default key, got forwarded reward {amount} from {user_name} of {amount} at {addr:?}");
+                    println!("With default key, got forwarded reward {amount} from {user_name} of {amount} at {addr:?}");
+                    beta_tracking
+                        .forwarded_payments
+                        .entry(user_name.to_owned())
+                        .or_default()
+                        .insert((addr, amount));
+                    return;
+                }
+            }
+
             warn!("Found a forwarded reward {amount} for an unknown participant at {addr:?}: {user_name_hash:?}");
-            eprintln!("Found a forwarded reward {amount} for an unknown participant at {addr:?}: {user_name_hash:?}");
+            println!("Found a forwarded reward {amount} for an unknown participant at {addr:?}: {user_name_hash:?}");
             beta_tracking
                 .forwarded_payments
                 .entry(format!("unknown participant: {user_name_hash:?}"))
diff --git a/sn_transfers/src/lib.rs b/sn_transfers/src/lib.rs
index 2224b0e1c4..0130776689 100644
--- a/sn_transfers/src/lib.rs
+++ b/sn_transfers/src/lib.rs
@@ -37,6 +37,7 @@ pub use wallet::{
     QUOTE_EXPIRATION_SECS, WALLET_DIR_NAME,
 };
 
+use bls::SecretKey;
 use lazy_static::lazy_static;
 
 /// The following PKs shall be updated to match its correspondent SKs before the formal release
@@ -47,6 +48,9 @@ const DEFAULT_FOUNDATION_PK_STR: &str = "8f73b97377f30bed96df1c92daf9f21b4a82c86
 const DEFAULT_NETWORK_ROYALTIES_STR: &str = "b4243ec9ceaec374ef992684cd911b209758c5de53d1e406b395bc37ebc8ce50e68755ea6d32da480ae927e1af4ddadb"; // DevSkim: ignore DS173237
 /// Public key where payment forward to be targeted.
 const DEFAULT_PAYMENT_FORWARD_STR: &str = "a585839f0502713a0ed6a327f3bd0c301f9e8fe298c93dd00ed7869d8e6804244f0d3014e90df45cd344a7ccd702865c"; // DevSkim: ignore DS173237
+/// Default secrect key where payment forward to be targeted, for backward compatible purpose only.
+const DEFAULT_PAYMENT_FORWARD_SK_STR: &str =
+    "49113d2083f57a976076adbe85decb75115820de1e6e74b47e0429338cef124a"; // DevSkim: ignore DS173237
 
 lazy_static! {
     pub static ref FOUNDATION_PK: MainPubkey = {
@@ -126,6 +130,12 @@ lazy_static! {
             Err(err) => panic!("Failed to parse payment forward PK: {err:?}"),
         }
     };
+    pub static ref DEFAULT_PAYMENT_FORWARD_SK: SecretKey = {
+        match SecretKey::from_hex(DEFAULT_PAYMENT_FORWARD_SK_STR) {
+            Ok(sk) => sk,
+            Err(err) => panic!("Failed to parse default payment forward SK: {err:?}"),
+        }
+    };
 }
 
 // re-export crates used in our public API