diff --git a/src/thirdparty_base58.c b/src/thirdparty_base58.c
new file mode 100644
index 0000000..6265741
--- /dev/null
+++ b/src/thirdparty_base58.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright 2012-2014 Luke Dashjr
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the standard MIT license.  See COPYING for more details.
+ */
+
+#ifndef WIN32
+#include <arpa/inet.h>
+#else
+#include <winsock2.h>
+#endif
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "libbase58.h"
+
+bool (*b58_sha256_impl)(void *, const void *, size_t) = NULL;
+
+static const int8_t b58digits_map[] = {
+	-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,
+	-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,
+	-1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1,
+	-1, 0, 1, 2, 3, 4, 5, 6,  7, 8,-1,-1,-1,-1,-1,-1,
+	-1, 9,10,11,12,13,14,15, 16,-1,17,18,19,20,21,-1,
+	22,23,24,25,26,27,28,29, 30,31,32,-1,-1,-1,-1,-1,
+	-1,33,34,35,36,37,38,39, 40,41,42,43,-1,44,45,46,
+	47,48,49,50,51,52,53,54, 55,56,57,-1,-1,-1,-1,-1,
+};
+
+typedef uint64_t b58_maxint_t;
+typedef uint32_t b58_almostmaxint_t;
+#define b58_almostmaxint_bits (sizeof(b58_almostmaxint_t) * 8)
+static const b58_almostmaxint_t b58_almostmaxint_mask = ((((b58_maxint_t)1) << b58_almostmaxint_bits) - 1);
+
+bool b58tobin(void *bin, size_t *binszp, const char *b58, size_t b58sz)
+{
+	size_t binsz = *binszp;
+	const unsigned char *b58u = (void*)b58;
+	unsigned char *binu = bin;
+	size_t outisz = (binsz + sizeof(b58_almostmaxint_t) - 1) / sizeof(b58_almostmaxint_t);
+	b58_almostmaxint_t outi[outisz];
+	b58_maxint_t t;
+	b58_almostmaxint_t c;
+	size_t i, j;
+	uint8_t bytesleft = binsz % sizeof(b58_almostmaxint_t);
+	b58_almostmaxint_t zeromask = bytesleft ? (b58_almostmaxint_mask << (bytesleft * 8)) : 0;
+	unsigned zerocount = 0;
+	
+	if (!b58sz)
+		b58sz = strlen(b58);
+	
+	for (i = 0; i < outisz; ++i) {
+		outi[i] = 0;
+	}
+	
+	// Leading zeros, just count
+	for (i = 0; i < b58sz && b58u[i] == '1'; ++i)
+		++zerocount;
+	
+	for ( ; i < b58sz; ++i)
+	{
+		if (b58u[i] & 0x80)
+			// High-bit set on invalid digit
+			return false;
+		if (b58digits_map[b58u[i]] == -1)
+			// Invalid base58 digit
+			return false;
+		c = (unsigned)b58digits_map[b58u[i]];
+		for (j = outisz; j--; )
+		{
+			t = ((b58_maxint_t)outi[j]) * 58 + c;
+			c = t >> b58_almostmaxint_bits;
+			outi[j] = t & b58_almostmaxint_mask;
+		}
+		if (c)
+			// Output number too big (carry to the next int32)
+			return false;
+		if (outi[0] & zeromask)
+			// Output number too big (last int32 filled too far)
+			return false;
+	}
+	
+	j = 0;
+	if (bytesleft) {
+		for (i = bytesleft; i > 0; --i) {
+			*(binu++) = (outi[0] >> (8 * (i - 1))) & 0xff;
+		}
+		++j;
+	}
+	
+	for (; j < outisz; ++j)
+	{
+		for (i = sizeof(*outi); i > 0; --i) {
+			*(binu++) = (outi[j] >> (8 * (i - 1))) & 0xff;
+		}
+	}
+	
+	// Count canonical base58 byte count
+	binu = bin;
+	for (i = 0; i < binsz; ++i)
+	{
+		if (binu[i])
+			break;
+		--*binszp;
+	}
+	*binszp += zerocount;
+	
+	return true;
+}
+
+static
+bool my_dblsha256(void *hash, const void *data, size_t datasz)
+{
+	uint8_t buf[0x20];
+	return b58_sha256_impl(buf, data, datasz) && b58_sha256_impl(hash, buf, sizeof(buf));
+}
+
+int b58check(const void *bin, size_t binsz, const char *base58str, size_t b58sz)
+{
+	unsigned char buf[32];
+	const uint8_t *binc = bin;
+	unsigned i;
+	if (binsz < 4)
+		return -4;
+	if (!my_dblsha256(buf, bin, binsz - 4))
+		return -2;
+	if (memcmp(&binc[binsz - 4], buf, 4))
+		return -1;
+	
+	// Check number of zeros is correct AFTER verifying checksum (to avoid possibility of accessing base58str beyond the end)
+	for (i = 0; binc[i] == '\0' && base58str[i] == '1'; ++i)
+	{}  // Just finding the end of zeros, nothing to do in loop
+	if (binc[i] == '\0' || base58str[i] == '1')
+		return -3;
+	
+	return binc[0];
+}
+
+static const char b58digits_ordered[] = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
+
+bool b58enc(char *b58, size_t *b58sz, const void *data, size_t binsz)
+{
+	const uint8_t *bin = data;
+	int carry;
+	size_t i, j, high, zcount = 0;
+	size_t size;
+	
+	while (zcount < binsz && !bin[zcount])
+		++zcount;
+	
+	size = (binsz - zcount) * 138 / 100 + 1;
+	uint8_t buf[size];
+	memset(buf, 0, size);
+	
+	for (i = zcount, high = size - 1; i < binsz; ++i, high = j)
+	{
+		for (carry = bin[i], j = size - 1; (j > high) || carry; --j)
+		{
+			carry += 256 * buf[j];
+			buf[j] = carry % 58;
+			carry /= 58;
+			if (!j) {
+				// Otherwise j wraps to maxint which is > high
+				break;
+			}
+		}
+	}
+	
+	for (j = 0; j < size && !buf[j]; ++j);
+	
+	if (*b58sz <= zcount + size - j)
+	{
+		*b58sz = zcount + size - j + 1;
+		return false;
+	}
+	
+	if (zcount)
+		memset(b58, '1', zcount);
+	for (i = zcount; j < size; ++i, ++j)
+		b58[i] = b58digits_ordered[buf[j]];
+	b58[i] = '\0';
+	*b58sz = i + 1;
+	
+	return true;
+}
+
+bool b58check_enc(char *b58c, size_t *b58c_sz, uint8_t ver, const void *data, size_t datasz)
+{
+	uint8_t buf[1 + datasz + 0x20];
+	uint8_t *hash = &buf[1 + datasz];
+	
+	buf[0] = ver;
+	memcpy(&buf[1], data, datasz);
+	if (!my_dblsha256(hash, buf, datasz + 1))
+	{
+		*b58c_sz = 0;
+		return false;
+	}
+	
+	return b58enc(b58c, b58c_sz, buf, 1 + datasz + 4);
+}
diff --git a/src/thirdparty_base58.h b/src/thirdparty_base58.h
new file mode 100644
index 0000000..fafe653
--- /dev/null
+++ b/src/thirdparty_base58.h
@@ -0,0 +1,23 @@
+#ifndef LIBBASE58_H
+#define LIBBASE58_H
+
+#include <stdbool.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern bool (*b58_sha256_impl)(void *, const void *, size_t);
+
+extern bool b58tobin(void *bin, size_t *binsz, const char *b58, size_t b58sz);
+extern int b58check(const void *bin, size_t binsz, const char *b58, size_t b58sz);
+
+extern bool b58enc(char *b58, size_t *b58sz, const void *bin, size_t binsz);
+extern bool b58check_enc(char *b58c, size_t *b58c_sz, uint8_t ver, const void *data, size_t datasz);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif