diff --git a/src/base58.cpp b/src/base58.cpp
index 9b2946e7a9..3a28088079 100644
--- a/src/base58.cpp
+++ b/src/base58.cpp
@@ -35,7 +35,7 @@ static const int8_t mapBase58[256] = {
     -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,
 };
 
-bool DecodeBase58(const char* psz, std::vector<unsigned char>& vch, int max_ret_len)
+NODISCARD static bool DecodeBase58(const char* psz, std::vector<unsigned char>& vch, int max_ret_len)
 {
     // Skip leading spaces.
     while (*psz && IsSpace(*psz))
@@ -146,7 +146,7 @@ std::string EncodeBase58Check(const std::vector<unsigned char>& vchIn)
     return EncodeBase58(vch);
 }
 
-bool DecodeBase58Check(const char* psz, std::vector<unsigned char>& vchRet, int max_ret_len)
+NODISCARD static bool DecodeBase58Check(const char* psz, std::vector<unsigned char>& vchRet, int max_ret_len)
 {
     if (!DecodeBase58(psz, vchRet, max_ret_len > std::numeric_limits<int>::max() - 4 ? std::numeric_limits<int>::max() : max_ret_len + 4) ||
         (vchRet.size() < 4)) {
diff --git a/src/base58.h b/src/base58.h
index 042ad671d3..a869ee1e75 100644
--- a/src/base58.h
+++ b/src/base58.h
@@ -30,13 +30,6 @@ std::string EncodeBase58(const unsigned char* pbegin, const unsigned char* pend)
  */
 std::string EncodeBase58(const std::vector<unsigned char>& vch);
 
-/**
- * Decode a base58-encoded string (psz) into a byte vector (vchRet).
- * return true if decoding is successful.
- * psz cannot be nullptr.
- */
-NODISCARD bool DecodeBase58(const char* psz, std::vector<unsigned char>& vchRet, int max_ret_len);
-
 /**
  * Decode a base58-encoded string (str) into a byte vector (vchRet).
  * return true if decoding is successful.
@@ -48,12 +41,6 @@ NODISCARD bool DecodeBase58(const std::string& str, std::vector<unsigned char>&
  */
 std::string EncodeBase58Check(const std::vector<unsigned char>& vchIn);
 
-/**
- * Decode a base58-encoded string (psz) that includes a checksum into a byte
- * vector (vchRet), return true if decoding is successful
- */
-NODISCARD bool DecodeBase58Check(const char* psz, std::vector<unsigned char>& vchRet, int max_ret_len);
-
 /**
  * Decode a base58-encoded string (str) that includes a checksum into a byte
  * vector (vchRet), return true if decoding is successful