diff --git a/.eslintrc b/.eslintrc
index bbe3a8a7..5c87b414 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -4,6 +4,9 @@
         "plugin:flowtype/recommended",
         "plugin:jest/recommended"
     ],
+    "globals": {
+        "COMMITHASH": true
+    },
     "env": {
         "browser": true,
         "jest": true
diff --git a/jest.config.js b/jest.config.js
index d7e1c86a..d9c12451 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,11 +1,19 @@
 module.exports = {
     rootDir: './src',
+    automock: false,
+    coverageDirectory: 'coverage/',
     collectCoverage: true,
     testURL: 'http://localhost',
     modulePathIgnorePatterns: [
         'node_modules',
+        'utils/windowUtils.js',
+        'utils/promiseUtils.js',
+        'utils/networkUtils.js',
     ],
     collectCoverageFrom: [
         'utils/**.js',
     ],
+    setupFiles: [
+        './support/setupJest.js',
+    ],
 };
diff --git a/package.json b/package.json
index 8a5ccc37..b3ba4764 100644
--- a/package.json
+++ b/package.json
@@ -31,8 +31,11 @@
         "ethereumjs-tx": "^1.3.3",
         "ethereumjs-units": "^0.2.0",
         "ethereumjs-util": "^5.1.4",
+        "git-revision-webpack-plugin": "^3.0.3",
+        "flow-webpack-plugin": "^1.2.0",
         "hdkey": "^0.8.0",
         "html-webpack-plugin": "^3.2.0",
+        "jest-fetch-mock": "^1.6.5",
         "npm-run-all": "^4.1.3",
         "prop-types": "^15.6.2",
         "raf": "^3.4.0",
diff --git a/public/data/appConfig.json b/public/data/appConfig.json
index c9c3ca0c..93b1520b 100644
--- a/public/data/appConfig.json
+++ b/public/data/appConfig.json
@@ -58,11 +58,11 @@
 
     "fiatValueTickers": [
         { 
-            "network": "ethereum",
+            "network": "eth",
             "url": "https://api.coinmarketcap.com/v1/ticker/ethereum/"
         },
         { 
-            "network": "ethereum-classic",
+            "network": "etc",
             "url": "https://api.coinmarketcap.com/v1/ticker/ethereum-classic/"
         }
     ],
diff --git a/src/actions/BlockchainActions.js b/src/actions/BlockchainActions.js
index 353cd345..5414df9d 100644
--- a/src/actions/BlockchainActions.js
+++ b/src/actions/BlockchainActions.js
@@ -111,7 +111,7 @@ export const onBlockMined = (coinInfo: any): PromiseAction<void> => async (dispa
                     dispatch( Web3Actions.updateAccount(accounts[i], a, network) )
                 } else {
                     // there are no new txs, just update block
-                    dispatch( AccountsActions.update( { ...accounts[i], ...a }) );
+                    dispatch( AccountsActions.update( { ...accounts[i], block: a.block }) );
 
                     // HACK: since blockbook can't work with smart contracts for now
                     // try to update tokens balances added to this account using Web3
diff --git a/src/actions/SendFormActions.js b/src/actions/SendFormActions.js
index 6288c9d6..6b59279a 100644
--- a/src/actions/SendFormActions.js
+++ b/src/actions/SendFormActions.js
@@ -13,6 +13,7 @@ import { initialState } from 'reducers/SendFormReducer';
 import { findToken } from 'reducers/TokensReducer';
 import { findDevice, getPendingAmount, getPendingNonce } from 'reducers/utils';
 import * as stateUtils from 'reducers/utils';
+import { validateAddress } from 'utils/ethUtils';
 
 import type {
     Dispatch,
@@ -345,32 +346,19 @@ export const validation = (props: Props): void => {
     if (state.untouched) return;
     // valid address
     if (state.touched.address) {
-        /* if (state.address.length < 1) {
-            errors.address = 'Address is not set';
-        } else if (!EthereumjsUtil.isValidAddress(state.address)) {
-            errors.address = 'Address is not valid';
-        } else {
-            // address warning or info are set in addressValidation ThunkAction
-            // do not override this
-            if (state.warnings.address) {
-                warnings.address = state.warnings.address;
-            } else if (state.infos.address) {
-                infos.address = state.infos.address;
-            }
-        } */
-
-        /* eslint (no-lonely-if) */
-        if (state.address.length < 1) {
-            errors.address = 'Address is not set';
-        } else if (!EthereumjsUtil.isValidAddress(state.address)) {
-            errors.address = 'Address is not valid';
-        } else if (state.warnings.address) {
-            // address warning or info are set in addressValidation ThunkAction
-            // do not override this
+        const addressError = validateAddress(state.address);
+        if (addressError) {
+            errors.address = addressError;
+        }
+
+        // address warning or info may be set in addressValidation ThunkAction
+        // do not override them
+        if (state.warnings.address) {
             warnings.address = state.warnings.address;
-            if (state.infos.address) {
-                infos.address = state.infos.address;
-            }
+        }
+
+        if (state.infos.address) {
+            infos.address = state.infos.address;
         }
     }
 
diff --git a/src/components/Checkbox/index.js b/src/components/Checkbox/index.js
index 5e65eed9..fad58722 100644
--- a/src/components/Checkbox/index.js
+++ b/src/components/Checkbox/index.js
@@ -1,6 +1,6 @@
 import React, { PureComponent } from 'react';
 import PropTypes from 'prop-types';
-import styled from 'styled-components';
+import styled, { css } from 'styled-components';
 import colors from 'config/colors';
 import Icon from 'components/Icon';
 import icons from 'config/icons';
@@ -34,8 +34,9 @@ const IconWrapper = styled.div`
 
     &:hover,
     &:focus {
-        border: 1px solid ${colors.GREEN_PRIMARY};
-        color: ${colors.WHITE};
+        ${props => !props.checked && css`
+            border: 1px solid ${colors.GREEN_PRIMARY};
+        `}
         background: ${props => (props.checked ? colors.GREEN_PRIMARY : colors.WHITE)};
     }
 `;
diff --git a/src/components/Footer/index.js b/src/components/Footer/index.js
index fa695d98..8f19462c 100644
--- a/src/components/Footer/index.js
+++ b/src/components/Footer/index.js
@@ -29,7 +29,7 @@ const Copy = styled.div`
 
 const Footer = ({ toggle }) => (
     <Wrapper>
-        <Copy>&copy; {getYear(new Date())}</Copy>
+        <Copy title={COMMITHASH}>&copy; {getYear(new Date())}</Copy>
         <StyledLink href="http://satoshilabs.com" target="_blank" rel="noreferrer noopener" isGreen>SatoshiLabs</StyledLink>
         <StyledLink href="/assets/tos.pdf" target="_blank" rel="noreferrer noopener" isGreen>Terms</StyledLink>
         <StyledLink onClick={toggle} isGreen>Show Log</StyledLink>
diff --git a/src/components/Icon/index.js b/src/components/Icon/index.js
index 6e5b0d71..1879547c 100644
--- a/src/components/Icon/index.js
+++ b/src/components/Icon/index.js
@@ -27,7 +27,7 @@ const SvgWrapper = styled.svg`
 
     :hover {
         path {
-            fill: ${props => props.hoverColor || colors.TEXT_SECONDARY}
+            fill: ${props => props.hoverColor}
         }
     }
 `;
diff --git a/src/components/Paragraph/index.js b/src/components/Paragraph/index.js
index 88a24fb8..34f498de 100644
--- a/src/components/Paragraph/index.js
+++ b/src/components/Paragraph/index.js
@@ -26,10 +26,7 @@ const P = ({ children, className, isSmaller = false }) => (
 P.propTypes = {
     className: PropTypes.string,
     isSmaller: PropTypes.bool,
-    children: PropTypes.oneOfType([
-        PropTypes.array,
-        PropTypes.string,
-    ]),
+    children: PropTypes.node,
 };
 
 export default P;
diff --git a/src/components/inputs/Input/index.js b/src/components/inputs/Input/index.js
index 339b73cc..5bd17dc5 100644
--- a/src/components/inputs/Input/index.js
+++ b/src/components/inputs/Input/index.js
@@ -114,6 +114,7 @@ class Input extends Component {
                             />
                         )}
                         <StyledInput
+                            innerRef={this.props.innerRef}
                             hasAddon={!!this.props.sideAddons}
                             type={this.props.type}
                             placeholder={this.props.placeholder}
@@ -143,13 +144,14 @@ class Input extends Component {
 
 Input.propTypes = {
     className: PropTypes.string,
+    innerRef: PropTypes.func,
     placeholder: PropTypes.string,
     type: PropTypes.string,
     autoComplete: PropTypes.string,
     autoCorrect: PropTypes.string,
     autoCapitalize: PropTypes.string,
     spellCheck: PropTypes.string,
-    value: PropTypes.string.isRequired,
+    value: PropTypes.string,
     onChange: PropTypes.func,
     state: PropTypes.string,
     bottomText: PropTypes.string,
diff --git a/src/components/modals/passphrase/Passphrase/index.js b/src/components/modals/passphrase/Passphrase/index.js
index cbfc3801..f9a5e1f3 100644
--- a/src/components/modals/passphrase/Passphrase/index.js
+++ b/src/components/modals/passphrase/Passphrase/index.js
@@ -2,6 +2,7 @@
 import React, { Component } from 'react';
 import raf from 'raf';
 import colors from 'config/colors';
+import { H2 } from 'components/Heading';
 import P from 'components/Paragraph';
 import { FONT_SIZE } from 'config/variables';
 import Link from 'components/Link';
@@ -23,7 +24,10 @@ const Label = styled.div`
     padding-bottom: 5px;
 `;
 
-const PassphraseError = styled.div``;
+const PassphraseError = styled.div`
+    margin-top: 8px;
+    color: ${colors.ERROR_PRIMARY};
+`;
 
 const Row = styled.div`
     position: relative;
@@ -137,22 +141,25 @@ export default class PinModal extends Component<Props, State> {
         } = this.state;
         // } = this.props.modal;
 
-        let passphraseInputValue: string = passphrase;
-        let passphraseRevisionInputValue: string = passphraseRevision;
-        if (!visible && !passphraseFocused) {
-            passphraseInputValue = passphrase.replace(/./g, '•');
-        }
-        if (!visible && !passphraseRevisionFocused) {
-            passphraseRevisionInputValue = passphraseRevision.replace(/./g, '•');
-        }
+        const passphraseInputValue: string = passphrase;
+        const passphraseRevisionInputValue: string = passphraseRevision;
+        // if (!visible && !passphraseFocused) {
+        //     passphraseInputValue = passphrase.replace(/./g, '•');
+        // }
+        // if (!visible && !passphraseRevisionFocused) {
+        //     passphraseRevisionInputValue = passphraseRevision.replace(/./g, '•');
+        // }
+
 
         if (this.passphraseInput) {
-            this.passphraseInput.value = passphraseInputValue;
-            this.passphraseInput.setAttribute('type', visible || (!visible && !passphraseFocused) ? 'text' : 'password');
+            // this.passphraseInput.value = passphraseInputValue;
+            // this.passphraseInput.setAttribute('type', visible || (!visible && !passphraseFocused) ? 'text' : 'password');
+            this.passphraseInput.setAttribute('type', visible ? 'text' : 'password');
         }
         if (this.passphraseRevisionInput) {
-            this.passphraseRevisionInput.value = passphraseRevisionInputValue;
-            this.passphraseRevisionInput.setAttribute('type', visible || (!visible && !passphraseRevisionFocused) ? 'text' : 'password');
+            // this.passphraseRevisionInput.value = passphraseRevisionInputValue;
+            // this.passphraseRevisionInput.setAttribute('type', visible || (!visible && !passphraseRevisionFocused) ? 'text' : 'password');
+            this.passphraseRevisionInput.setAttribute('type', visible ? 'text' : 'password');
         }
     }
 
@@ -174,6 +181,14 @@ export default class PinModal extends Component<Props, State> {
                 match: previousState.singleInput || previousState.passphraseRevision === value,
                 passphrase: value,
             }));
+
+            if (this.state.visible && this.passphraseRevisionInput) {
+                this.setState({
+                    match: true,
+                    passphraseRevision: value,
+                });
+                this.passphraseRevisionInput.value = value;
+            }
         } else {
             this.setState(previousState => ({
                 match: previousState.passphrase === value,
@@ -211,12 +226,29 @@ export default class PinModal extends Component<Props, State> {
         this.setState({
             visible: true,
         });
+        if (this.passphraseRevisionInput) {
+            this.passphraseRevisionInput.disabled = true;
+            this.passphraseRevisionInput.value = this.state.passphrase;
+            this.setState(previousState => ({
+                passphraseRevision: previousState.passphrase,
+                match: true,
+            }));
+        }
     }
 
     onPassphraseHide = (): void => {
         this.setState({
             visible: false,
         });
+        if (this.passphraseRevisionInput) {
+            const emptyPassphraseRevisionValue = '';
+            this.passphraseRevisionInput.value = emptyPassphraseRevisionValue;
+            this.setState(previousState => ({
+                passphraseRevision: emptyPassphraseRevisionValue,
+                match: emptyPassphraseRevisionValue === previousState.passphrase,
+            }));
+            this.passphraseRevisionInput.disabled = false;
+        }
     }
 
     submit = (empty: boolean = false): void => {
@@ -232,7 +264,7 @@ export default class PinModal extends Component<Props, State> {
         //this.passphraseRevisionInput.style.display = 'none';
         //this.passphraseRevisionInput.setAttribute('readonly', 'readonly');
 
-        const p = passphrase;
+        // const p = passphrase;
 
         this.setState({
             passphrase: '',
@@ -271,11 +303,10 @@ export default class PinModal extends Component<Props, State> {
         //let passphraseRevisionInputType: string = visible || passphraseRevisionFocused ? "text" : "password";
 
         const showPassphraseCheckboxFn: Function = visible ? this.onPassphraseHide : this.onPassphraseShow;
-        console.log('passphraseInputType', passphraseInputType);
         return (
             <Wrapper>
-                {/* ?<H2>Enter { deviceLabel } passphrase</H2> */}
-                {/* <P isSmaller>Note that passphrase is case-sensitive.</P> */}
+                <H2>Enter { deviceLabel } passphrase</H2>
+                <P isSmaller>Note that passphrase is case-sensitive.</P>
                 <Row>
                     <Label>Passphrase</Label>
                     <Input
@@ -289,7 +320,7 @@ export default class PinModal extends Component<Props, State> {
                         data-lpignore="true"
                         onFocus={() => this.onPassphraseFocus('passphrase')}
                         onBlur={() => this.onPassphraseBlur('passphrase')}
-                        tabIndex="1"
+                        tabIndex="0"
                     />
                 </Row>
                 {!singleInput && (
@@ -306,7 +337,6 @@ export default class PinModal extends Component<Props, State> {
                             data-lpignore="true"
                             onFocus={() => this.onPassphraseFocus('revision')}
                             onBlur={() => this.onPassphraseBlur('revision')}
-                            tabIndex="2"
                         />
                         {!match && passphraseRevisionTouched && <PassphraseError>Passphrases do not match</PassphraseError> }
                     </Row>
@@ -315,7 +345,7 @@ export default class PinModal extends Component<Props, State> {
                     <Checkbox onClick={showPassphraseCheckboxFn} checked={visible}>Show passphrase</Checkbox>
                 </Row>
                 <Row>
-                    <Button type="button" tabIndex="4" disabled={!match} onClick={event => this.submit()}>Enter</Button>
+                    <Button type="button" disabled={!match} onClick={() => this.submit()}>Enter</Button>
                 </Row>
                 <Footer>
                     <P isSmaller>If you want to access your default account</P>
diff --git a/src/reducers/ModalReducer.js b/src/reducers/ModalReducer.js
index f6e09a51..bd86b456 100644
--- a/src/reducers/ModalReducer.js
+++ b/src/reducers/ModalReducer.js
@@ -57,6 +57,7 @@ export default function modal(state: State = initialState, action: Action): Stat
             if (state.opened && action.device.path === state.device.path && action.device.status === 'occupied') {
                 return initialState;
             }
+
             return state;
 
         case DEVICE.DISCONNECT:
diff --git a/src/support/setupJest.js b/src/support/setupJest.js
new file mode 100644
index 00000000..8e88457e
--- /dev/null
+++ b/src/support/setupJest.js
@@ -0,0 +1 @@
+global.fetch = require('jest-fetch-mock');
\ No newline at end of file
diff --git a/src/utils/__tests__/__snapshots__/device.test.js.snap b/src/utils/__tests__/__snapshots__/device.test.js.snap
index 70364320..8ce5ffe6 100644
--- a/src/utils/__tests__/__snapshots__/device.test.js.snap
+++ b/src/utils/__tests__/__snapshots__/device.test.js.snap
@@ -55,3 +55,13 @@ exports[`device utils get version 4`] = `"1"`;
 exports[`device utils get version 5`] = `"1"`;
 
 exports[`device utils get version 6`] = `"T"`;
+
+exports[`device utils isDisabled 1`] = `false`;
+
+exports[`device utils isDisabled 2`] = `true`;
+
+exports[`device utils isWebUSB 1`] = `true`;
+
+exports[`device utils isWebUSB 2`] = `false`;
+
+exports[`device utils isWebUSB 3`] = `true`;
diff --git a/src/utils/__tests__/__snapshots__/ethUtils.test.js.snap b/src/utils/__tests__/__snapshots__/ethUtils.test.js.snap
index 0ffd930d..f5b70d96 100644
--- a/src/utils/__tests__/__snapshots__/ethUtils.test.js.snap
+++ b/src/utils/__tests__/__snapshots__/ethUtils.test.js.snap
@@ -1,5 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`eth utils calcGasPrice 1`] = `"89090990901"`;
+
 exports[`eth utils decimalToHex 1`] = `"0"`;
 
 exports[`eth utils decimalToHex 2`] = `"1"`;
@@ -8,4 +10,36 @@ exports[`eth utils decimalToHex 3`] = `"2"`;
 
 exports[`eth utils decimalToHex 4`] = `"64"`;
 
-exports[`eth utils decimalToHex 5`] = `"3e7"`;
+exports[`eth utils decimalToHex 5`] = `"2540be3ff"`;
+
+exports[`eth utils hexToDecimal 1`] = `"9999999999"`;
+
+exports[`eth utils hexToDecimal 2`] = `"100"`;
+
+exports[`eth utils hexToDecimal 3`] = `"2"`;
+
+exports[`eth utils hexToDecimal 4`] = `"1"`;
+
+exports[`eth utils hexToDecimal 5`] = `"0"`;
+
+exports[`eth utils hexToDecimal 6`] = `"null"`;
+
+exports[`eth utils padLeftEven 1`] = `"02540be3ff"`;
+
+exports[`eth utils sanitizeHex 1`] = `"0x02540be3ff"`;
+
+exports[`eth utils sanitizeHex 2`] = `"0x01"`;
+
+exports[`eth utils sanitizeHex 3`] = `"0x02"`;
+
+exports[`eth utils sanitizeHex 4`] = `"0x0100"`;
+
+exports[`eth utils sanitizeHex 5`] = `null`;
+
+exports[`eth utils sanitizeHex 6`] = `""`;
+
+exports[`eth utils strip 1`] = `""`;
+
+exports[`eth utils strip 2`] = `"02540be3ff"`;
+
+exports[`eth utils strip 3`] = `"02540be3ff"`;
diff --git a/src/utils/__tests__/__snapshots__/formatUtils.test.js.snap b/src/utils/__tests__/__snapshots__/formatUtils.test.js.snap
new file mode 100644
index 00000000..448a338a
--- /dev/null
+++ b/src/utils/__tests__/__snapshots__/formatUtils.test.js.snap
@@ -0,0 +1,45 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`format utils btckb2satoshib 1`] = `0`;
+
+exports[`format utils btckb2satoshib 2`] = `100000`;
+
+exports[`format utils btckb2satoshib 3`] = `200000`;
+
+exports[`format utils btckb2satoshib 4`] = `10000000`;
+
+exports[`format utils btckb2satoshib 5`] = `99900000`;
+
+exports[`format utils formatAmount 1`] = `"0 btc"`;
+
+exports[`format utils formatAmount 2`] = `"10 mBTC"`;
+
+exports[`format utils formatAmount 3`] = `"0.000005 mBTC"`;
+
+exports[`format utils formatAmount 4`] = `"1e-8 eth"`;
+
+exports[`format utils formatAmount 5`] = `"0.00099999 tau"`;
+
+exports[`format utils formatTime 1`] = `"No time estimate"`;
+
+exports[`format utils formatTime 2`] = `"1 minutes"`;
+
+exports[`format utils formatTime 3`] = `"2 minutes"`;
+
+exports[`format utils formatTime 4`] = `"1 hour 40 minutes"`;
+
+exports[`format utils formatTime 5`] = `"16 hours 39 minutes"`;
+
+exports[`format utils formatTime 6`] = `"45 minutes"`;
+
+exports[`format utils hexToString 1`] = `"test"`;
+
+exports[`format utils hexToString 2`] = `"0001"`;
+
+exports[`format utils hexToString 3`] = `"test99999"`;
+
+exports[`format utils stringToHex 1`] = `"0074006500730074"`;
+
+exports[`format utils stringToHex 2`] = `"0030003000300031"`;
+
+exports[`format utils stringToHex 3`] = `"007400650073007400390039003900390039"`;
diff --git a/src/utils/__tests__/device.test.js b/src/utils/__tests__/device.test.js
index 6bfdc4c6..e135a151 100644
--- a/src/utils/__tests__/device.test.js
+++ b/src/utils/__tests__/device.test.js
@@ -38,6 +38,29 @@ describe('device utils', () => {
         });
     });
 
+    it('isWebUSB', () => {
+        const data = [
+            { transport: { version: ['webusb'] } },
+            { transport: { version: ['aaaaaa'] } },
+            { transport: { version: ['webusb', 'test'] } },
+        ];
+
+        data.forEach((item) => {
+            expect(dUtils.isWebUSB(item.transport)).toMatchSnapshot();
+        });
+    });
+
+    it('isDisabled', () => {
+        const data = [
+            { selectedDevice: { features: null }, devices: [1, 2, 3], transport: { version: ['webusb', 'test'] } },
+            { selectedDevice: { features: null }, devices: [], transport: { version: ['test'] } },
+        ];
+
+        data.forEach((item) => {
+            expect(dUtils.isDisabled(item.selectedDevice, item.devices, item.transport)).toMatchSnapshot();
+        });
+    });
+
     it('get version', () => {
         const deviceMock = [
             { },
diff --git a/src/utils/__tests__/ethUtils.test.js b/src/utils/__tests__/ethUtils.test.js
index 3ff6e2ea..07bd1250 100644
--- a/src/utils/__tests__/ethUtils.test.js
+++ b/src/utils/__tests__/ethUtils.test.js
@@ -1,11 +1,53 @@
+import BigNumber from 'bignumber.js';
 import * as ethUtils from '../ethUtils';
 
 describe('eth utils', () => {
     it('decimalToHex', () => {
-        const input = [0, 1, 2, 100, 999];
+        const input = [0, 1, 2, 100, 9999999999];
 
         input.forEach((entry) => {
             expect(ethUtils.decimalToHex(entry)).toMatchSnapshot();
         });
     });
+
+    it('hexToDecimal', () => {
+        const input = ['2540be3ff', '64', '2', '1', '0', ''];
+
+        input.forEach((entry) => {
+            expect(ethUtils.hexToDecimal(entry)).toMatchSnapshot();
+        });
+    });
+
+    it('padLeftEven', () => {
+        const input = ['2540be3ff'];
+
+        input.forEach((entry) => {
+            expect(ethUtils.padLeftEven(entry)).toMatchSnapshot();
+        });
+    });
+
+    it('sanitizeHex', () => {
+        const input = ['0x2540be3ff', '1', '2', '100', 999, ''];
+
+        input.forEach((entry) => {
+            expect(ethUtils.sanitizeHex(entry)).toMatchSnapshot();
+        });
+    });
+
+
+    it('strip', () => {
+        const input = ['0x', '0x2540be3ff', '2540be3ff'];
+
+        input.forEach((entry) => {
+            expect(ethUtils.strip(entry)).toMatchSnapshot();
+        });
+    });
+
+    it('calcGasPrice', () => {
+        const input = [{ price: new BigNumber(9898998989), limit: '9' }];
+
+        input.forEach((entry) => {
+            expect(ethUtils.calcGasPrice(entry.price, entry.limit)).toMatchSnapshot();
+        });
+    });
 });
diff --git a/src/utils/__tests__/formatUtils.test.js b/src/utils/__tests__/formatUtils.test.js
new file mode 100644
index 00000000..eb1d026d
--- /dev/null
+++ b/src/utils/__tests__/formatUtils.test.js
@@ -0,0 +1,49 @@
+import * as formatUtils from '../formatUtils';
+
+describe('format utils', () => {
+    it('formatAmount', () => {
+        const input = [
+            { amount: 0, coinInfo: { isBitcoin: true, currencyUnits: 'mbtc', shortcut: 'btc' } },
+            { amount: 1000000, coinInfo: { isBitcoin: true, currencyUnits: 'mbtc', shortcut: 'btc' } },
+            { amount: 0.5, coinInfo: { isBitcoin: true, currencyUnits: 'mbtc', shortcut: 'btc' } },
+            { amount: 1, coinInfo: { isBitcoin: false, shortcut: 'eth' } },
+            { amount: 99999, coinInfo: { isBitcoin: false, shortcut: 'tau' } },
+        ];
+
+        input.forEach((entry) => {
+            expect(formatUtils.formatAmount(entry.amount, entry.coinInfo, entry.coinInfo.currencyUnits)).toMatchSnapshot();
+        });
+    });
+
+    it('formatTime', () => {
+        const input = [0, 1, 2, 100, 999, 45];
+
+        input.forEach((entry) => {
+            expect(formatUtils.formatTime(entry)).toMatchSnapshot();
+        });
+    });
+
+    it('btckb2satoshib', () => {
+        const input = [0, 1, 2, 100, 999];
+
+        input.forEach((entry) => {
+            expect(formatUtils.btckb2satoshib(entry)).toMatchSnapshot();
+        });
+    });
+
+    it('stringToHex', () => {
+        const input = ['test', '0001', 'test99999'];
+
+        input.forEach((entry) => {
+            expect(formatUtils.stringToHex(entry)).toMatchSnapshot();
+        });
+    });
+
+    it('hexToString', () => {
+        const input = ['0074006500730074', '0030003000300031', '007400650073007400390039003900390039'];
+
+        input.forEach((entry) => {
+            expect(formatUtils.hexToString(entry)).toMatchSnapshot();
+        });
+    });
+});
diff --git a/src/utils/ethUtils.js b/src/utils/ethUtils.js
index 7b8ad313..82d5744a 100644
--- a/src/utils/ethUtils.js
+++ b/src/utils/ethUtils.js
@@ -1,6 +1,7 @@
 /* @flow */
 
 import BigNumber from 'bignumber.js';
+import EthereumjsUtil from 'ethereumjs-util';
 
 export const decimalToHex = (dec: number): string => new BigNumber(dec).toString(16);
 
@@ -28,4 +29,16 @@ export const strip = (str: string): string => {
     return padLeftEven(str);
 };
 
-export const calcGasPrice = (price: BigNumber, limit: string): string => price.times(limit).toString();
\ No newline at end of file
+export const calcGasPrice = (price: BigNumber, limit: string): string => price.times(limit).toString();
+
+export const validateAddress = (address: string): ?string => {
+    const hasUpperCase = new RegExp('^(.*[A-Z].*)$');
+    if (address.length < 1) {
+        return 'Address is not set';
+    } else if (!EthereumjsUtil.isValidAddress(address)) {
+        return 'Address is not valid';
+    } else if (address.match(hasUpperCase) && !EthereumjsUtil.isValidChecksumAddress(address)) {
+        return 'Address is not a valid checksum';
+    }
+    return null;
+}
\ No newline at end of file
diff --git a/src/utils/formatUtils.js b/src/utils/formatUtils.js
index 982c9afb..9009cc7e 100644
--- a/src/utils/formatUtils.js
+++ b/src/utils/formatUtils.js
@@ -1,11 +1,9 @@
 /* @flow */
 
-
-const currencyUnits: string = 'mbtc2';
-
 // TODO: chagne currency units
+const currencyUnitsConstant: string = 'mbtc2';
 
-export const formatAmount = (n: number, coinInfo: any): string => {
+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();
diff --git a/src/utils/networkUtils.js b/src/utils/networkUtils.js
index 360168d9..fc29250b 100644
--- a/src/utils/networkUtils.js
+++ b/src/utils/networkUtils.js
@@ -1,6 +1,5 @@
 /* @flow */
 
-
 import 'whatwg-fetch';
 
 export const httpRequest = async (url: string, type: string = 'text'): any => {
@@ -15,16 +14,6 @@ export const httpRequest = async (url: string, type: string = 'text'): any => {
         await response.text();
     }
     throw new Error(`${url} ${response.statusText}`);
-
-
-    // return fetch(url, { credentials: 'same-origin' }).then((response) => {
-    //     if (response.status === 200) {
-
-    //         return response.text().then(result => (json ? JSON.parse(result) : result));
-    //     } else {
-    //         throw new Error(response.statusText);
-    //     }
-    // })
 };
 
 export const JSONRequest = async (url: string): Promise<JSON> => {
diff --git a/webpack/dev.babel.js b/webpack/dev.babel.js
index 377bb513..f39a2e6e 100644
--- a/webpack/dev.babel.js
+++ b/webpack/dev.babel.js
@@ -1,12 +1,15 @@
 import webpack from 'webpack';
-
+import GitRevisionPlugin from 'git-revision-webpack-plugin';
 import HtmlWebpackPlugin from 'html-webpack-plugin';
+import FlowWebpackPlugin from 'flow-webpack-plugin';
+
 import { BundleAnalyzerPlugin } from 'webpack-bundle-analyzer';
 
 import {
     SRC, BUILD, PORT, PUBLIC,
 } from './constants';
 
+const gitRevisionPlugin = new GitRevisionPlugin();
 
 module.exports = {
     watch: true,
@@ -46,6 +49,7 @@ module.exports = {
                     {
                         loader: 'stylelint-custom-processor-loader',
                         options: {
+                            emitWarning: true,
                             configPath: '.stylelintrc',
                         },
                     },
@@ -89,6 +93,10 @@ module.exports = {
         hints: false,
     },
     plugins: [
+        new webpack.DefinePlugin({
+            COMMITHASH: JSON.stringify(gitRevisionPlugin.commithash()),
+        }),
+        new FlowWebpackPlugin(),
         new HtmlWebpackPlugin({
             chunks: ['index'],
             template: `${SRC}index.html`,
diff --git a/webpack/local.babel.js b/webpack/local.babel.js
index 92930de8..d760c9ac 100644
--- a/webpack/local.babel.js
+++ b/webpack/local.babel.js
@@ -1,5 +1,6 @@
 import webpack from 'webpack';
 import { BundleAnalyzerPlugin } from 'webpack-bundle-analyzer';
+import GitRevisionPlugin from 'git-revision-webpack-plugin';
 import HtmlWebpackPlugin from 'html-webpack-plugin';
 import CopyWebpackPlugin from 'copy-webpack-plugin';
 import MiniCssExtractPlugin from '../../trezor-connect/node_modules/mini-css-extract-plugin';
@@ -15,6 +16,8 @@ import {
     PORT,
 } from './constants';
 
+const gitRevisionPlugin = new GitRevisionPlugin();
+
 module.exports = {
     watch: true,
     mode: 'development',
@@ -115,7 +118,6 @@ module.exports = {
             filename: '[name].css',
             chunkFilename: '[id].css',
         }),
-        
         new HtmlWebpackPlugin({
             chunks: ['index'],
             template: `${SRC}index.html`,
@@ -164,6 +166,7 @@ module.exports = {
 
         new webpack.DefinePlugin({
             LOCAL: JSON.stringify(`http://localhost:${PORT}/`),
+            COMMITHASH: JSON.stringify(gitRevisionPlugin.commithash()),
         }),
 
         // ignore node lib from trezor-link
diff --git a/webpack/production.babel.js b/webpack/production.babel.js
index 39342d6b..95932ddd 100644
--- a/webpack/production.babel.js
+++ b/webpack/production.babel.js
@@ -1,9 +1,13 @@
 
 import webpack from 'webpack';
+import GitRevisionPlugin from 'git-revision-webpack-plugin';
 import HtmlWebpackPlugin from 'html-webpack-plugin';
 import CopyWebpackPlugin from 'copy-webpack-plugin';
+import FlowWebpackPlugin from 'flow-webpack-plugin';
 import { SRC, BUILD, PUBLIC } from './constants';
 
+const gitRevisionPlugin = new GitRevisionPlugin();
+
 module.exports = {
     mode: 'production',
     entry: {
@@ -60,6 +64,10 @@ module.exports = {
         hints: false,
     },
     plugins: [
+        new webpack.DefinePlugin({
+            COMMITHASH: JSON.stringify(gitRevisionPlugin.commithash()),
+        }),
+        new FlowWebpackPlugin(),
         new HtmlWebpackPlugin({
             chunks: ['index'],
             template: `${SRC}index.html`,
diff --git a/yarn.lock b/yarn.lock
index 223897f6..24401a58 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -255,6 +255,10 @@
   version "0.7.0"
   resolved "https://registry.yarnpkg.com/@sindresorhus/is/-/is-0.7.0.tgz#9a06f4f137ee84d7df0460c1fdb1135ffa6c50fd"
 
+"@types/jest@^23.0.0":
+  version "23.3.2"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-23.3.2.tgz#07b90f6adf75d42c34230c026a2529e56c249dbb"
+
 "@webassemblyjs/ast@1.5.13":
   version "1.5.13"
   resolved "https://registry.yarnpkg.com/@webassemblyjs/ast/-/ast-1.5.13.tgz#81155a570bd5803a30ec31436bc2c9c0ede38f25"
@@ -4310,6 +4314,10 @@ flow-parser@^0.*:
   version "0.72.0"
   resolved "https://registry.yarnpkg.com/flow-parser/-/flow-parser-0.72.0.tgz#6c8041e76ac7d0be1a71ce29c00cd1435fb6013c"
 
+flow-webpack-plugin@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/flow-webpack-plugin/-/flow-webpack-plugin-1.2.0.tgz#1958821d16135028e391cad5ee2f3a4fa78197ec"
+
 flush-write-stream@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/flush-write-stream/-/flush-write-stream-1.0.2.tgz#c81b90d8746766f1a609a46809946c45dd8ae417"
@@ -4523,6 +4531,10 @@ gh-got@^6.0.0:
     got "^7.0.0"
     is-plain-obj "^1.1.0"
 
+git-revision-webpack-plugin@^3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/git-revision-webpack-plugin/-/git-revision-webpack-plugin-3.0.3.tgz#f909949d7851d1039ed530518f73f5d46594e66f"
+
 github-username@^4.0.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/github-username/-/github-username-4.1.0.tgz#cbe280041883206da4212ae9e4b5f169c30bf417"
@@ -5593,7 +5605,7 @@ isobject@^3.0.0, isobject@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/isobject/-/isobject-3.0.1.tgz#4e431e92b11a9731636aa1f9c8d1ccbcfdab78df"
 
-isomorphic-fetch@^2.1.1:
+isomorphic-fetch@^2.1.1, isomorphic-fetch@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/isomorphic-fetch/-/isomorphic-fetch-2.2.1.tgz#611ae1acf14f5e81f729507472819fe9733558a9"
   dependencies:
@@ -5785,6 +5797,14 @@ jest-environment-node@^23.4.0:
     jest-mock "^23.2.0"
     jest-util "^23.4.0"
 
+jest-fetch-mock@^1.6.5:
+  version "1.6.5"
+  resolved "https://registry.yarnpkg.com/jest-fetch-mock/-/jest-fetch-mock-1.6.5.tgz#178fa1a937ef6f61fb8e8483b6d4602b17e0d96d"
+  dependencies:
+    "@types/jest" "^23.0.0"
+    isomorphic-fetch "^2.2.1"
+    promise-polyfill "^7.1.1"
+
 jest-get-type@^22.1.0:
   version "22.4.3"
   resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-22.4.3.tgz#e3a8504d8479342dd4420236b322869f18900ce4"
@@ -8034,6 +8054,10 @@ promise-inflight@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/promise-inflight/-/promise-inflight-1.0.1.tgz#98472870bf228132fcbdd868129bad12c3c029e3"
 
+promise-polyfill@^7.1.1:
+  version "7.1.2"
+  resolved "https://registry.yarnpkg.com/promise-polyfill/-/promise-polyfill-7.1.2.tgz#ab05301d8c28536301622d69227632269a70ca3b"
+
 promise@^7.1.1:
   version "7.3.1"
   resolved "https://registry.yarnpkg.com/promise/-/promise-7.3.1.tgz#064b72602b18f90f29192b8b1bc418ffd1ebd3bf"