diff --git a/src/utils/__tests__/formatUtils.test.js b/src/utils/__tests__/formatUtils.test.js
index 8e1b61bf..4d57d0d1 100644
--- a/src/utils/__tests__/formatUtils.test.js
+++ b/src/utils/__tests__/formatUtils.test.js
@@ -1,32 +1,24 @@
 import * as utils from '../formatUtils';
 
 describe('format utils', () => {
-    // TODO: check this weird function
-    it('formatAmount', () => {
-        expect(utils.formatAmount(0, { isBitcoin: false, shortcut: 'mbtc' }, 'mbtc')).toBe('0 mbtc');
-        expect(utils.formatAmount(1000000, { isBitcoin: true }, 'mbtc')).toBe('10 mBTC');
-        expect(utils.formatAmount(0.5, { isBitcoin: true }, 'mbtc')).toBe('0.000005 mBTC');
-        expect(utils.formatAmount(1, { isBitcoin: false, shortcut: 'eth' }, null)).toBe('1e-8 eth');
-        expect(utils.formatAmount(99999, { isBitcoin: false, shortcut: 'tau' }, null)).toBe('0.00099999 tau');
+    it('to decimal amount', () => {
+        expect(utils.toDecimalAmount(0, 1)).toBe('0');
+        expect(utils.toDecimalAmount(1, 1)).toBe('0.1');
+        expect(utils.toDecimalAmount(1000, 1)).toBe('100');
+        expect(utils.toDecimalAmount(1000, 2)).toBe('10');
+        expect(utils.toDecimalAmount(1000, 3)).toBe('1');
+        expect(utils.toDecimalAmount('1', 'a')).toBe('NaN');
+        expect(utils.toDecimalAmount('a', 'a')).toBe('0');
+        expect(utils.toDecimalAmount('a', '1')).toBe('0');
     });
 
-    it('btckb2satoshib', () => {
-        expect(utils.btckb2satoshib(0)).toBe(0);
-        expect(utils.btckb2satoshib(1)).toBe(100000);
-        expect(utils.btckb2satoshib(2)).toBe(200000);
-        expect(utils.btckb2satoshib(100)).toBe(10000000);
-        expect(utils.btckb2satoshib(999)).toBe(99900000);
-    });
-
-    it('string to hex', () => {
-        expect(utils.stringToHex('test')).toBe('0074006500730074');
-        expect(utils.stringToHex('0001')).toBe('0030003000300031');
-        expect(utils.stringToHex('test99999')).toBe('007400650073007400390039003900390039');
-    });
-
-    it('hex to string', () => {
-        expect(utils.hexToString('0074006500730074')).toBe('test');
-        expect(utils.hexToString('0030003000300031')).toBe('0001');
-        expect(utils.hexToString('007400650073007400390039003900390039')).toBe('test99999');
+    it('from decimal amount', () => {
+        expect(utils.fromDecimalAmount(0, 1)).toBe('0');
+        expect(utils.fromDecimalAmount(10, 1)).toBe('100');
+        expect(utils.fromDecimalAmount(10, 2)).toBe('1000');
+        expect(utils.fromDecimalAmount(10, 3)).toBe('10000');
+        expect(utils.fromDecimalAmount('1', 'a')).toBe('NaN');
+        expect(utils.fromDecimalAmount('a', 'a')).toBe('0');
+        expect(utils.fromDecimalAmount('a', '1')).toBe('0');
     });
 });
diff --git a/src/utils/formatUtils.js b/src/utils/formatUtils.js
index aa9970cd..4cea3e00 100644
--- a/src/utils/formatUtils.js
+++ b/src/utils/formatUtils.js
@@ -2,39 +2,6 @@
 
 import BigNumber from 'bignumber.js';
 
-const currencyUnitsConstant: string = 'mbtc2';
-
-export const formatAmount = (n: number, coinInfo: any, currencyUnits: string = currencyUnitsConstant): string => {
-    const amount = (n / 1e8);
-    if (coinInfo.isBitcoin && currencyUnits === 'mbtc' && amount <= 0.1 && n !== 0) {
-        const s = (n / 1e5).toString();
-        return `${s} mBTC`;
-    }
-    const s = amount.toString();
-    return `${s} ${coinInfo.shortcut}`;
-};
-
-export const btckb2satoshib = (n: number): number => Math.round(n * 1e5);
-
-export const stringToHex = (str: string): string => {
-    let result: string = '';
-    let hex: string;
-    for (let i = 0; i < str.length; i++) {
-        hex = str.charCodeAt(i).toString(16);
-        result += (`000${hex}`).slice(-4);
-    }
-    return result;
-};
-
-export const hexToString = (hex: string): string => {
-    let str = '';
-    for (let i = 0; i < hex.length; i += 2) {
-        const v = parseInt(hex.substr(i, 2), 16);
-        if (v) str += String.fromCharCode(v);
-    }
-    return str;
-};
-
 export const toDecimalAmount = (amount: string | number, decimals: number): string => {
     try {
         const bAmount = new BigNumber(amount);