diff --git a/src/js/backend/BlockchainLink.js b/src/js/backend/BlockchainLink.js
index c14be6321..ffcb07afb 100644
--- a/src/js/backend/BlockchainLink.js
+++ b/src/js/backend/BlockchainLink.js
@@ -9,10 +9,7 @@ import type {
     GetAccountInfo,
     BlockchainBlock,
     BlockchainSubscribeAccount,
-    BlockchainTransactions,
     BlockchainFiatRates,
-    BlockchainTimestampedFiatRates,
-    BlockchainAccountBalanceHistory,
     BlockchainGetAccountBalanceHistory,
 } from '../types';
 
@@ -108,32 +105,32 @@ export default class Blockchain {
         }
     }
 
-    async loadTransaction(id: string): Promise<BitcoinJsTransaction> {
+    async loadTransaction(id: string) {
         const transaction = await this.link.getTransaction(id);
         return BitcoinJsTransaction.fromHex(transaction.tx.hex, this.coinInfo.network);
     }
 
-    async getTransactions(txs: string[]): Promise<BlockchainTransactions[]> {
+    async getTransactions(txs: string[]) {
         return Promise.all(
             txs.map(id => this.link.getTransaction(id))
         );
     }
 
-    async getReferencedTransactions(txs: string[]): Promise<BitcoinJsTransaction[]> {
+    async getReferencedTransactions(txs: string[]) {
         return Promise.all(
             txs.map(id => this.loadTransaction(id))
         );
     }
 
-    async getCurrentFiatRates(params: { currencies?: ?string[] }): Promise<BlockchainTimestampedFiatRates> {
+    async getCurrentFiatRates(params: { currencies?: ?string[] }) {
         return this.link.getCurrentFiatRates(params);
     }
 
-    async getFiatRatesForTimestamps(params: { timestamps?: ?number[] }): Promise<BlockchainTimestampedFiatRates[]> {
+    async getFiatRatesForTimestamps(params: { timestamps?: ?number[] }) {
         return this.link.getFiatRatesForTimestamps(params);
     }
 
-    async getAccountBalanceHistory(params: $Shape<BlockchainGetAccountBalanceHistory>): Promise<BlockchainAccountBalanceHistory[]> {
+    async getAccountBalanceHistory(params: $Shape<BlockchainGetAccountBalanceHistory>) {
         return this.link.getAccountBalanceHistory(params);
     }
 
@@ -170,7 +167,7 @@ export default class Blockchain {
         return this.link.estimateFee(request);
     }
 
-    async subscribe(accounts: BlockchainSubscribeAccount[]): Promise<{ subscribed: boolean }> {
+    async subscribe(accounts: BlockchainSubscribeAccount[]) {
         // set block listener if it wasn't set before
         if (this.link.listenerCount('block') === 0) {
             this.link.on('block', (block: BlockchainBlock) => {
@@ -199,7 +196,7 @@ export default class Blockchain {
         });
     }
 
-    async subscribeFiatRates(currency?: string): Promise<{ subscribed: boolean }> {
+    async subscribeFiatRates(currency?: string) {
         // set block listener if it wasn't set before
         if (this.link.listenerCount('fiatRates') === 0) {
             this.link.on('fiatRates', (res: {
@@ -217,7 +214,7 @@ export default class Blockchain {
         });
     }
 
-    async unsubscribe(accounts?: BlockchainSubscribeAccount[]): Promise<any> {
+    async unsubscribe(accounts?: BlockchainSubscribeAccount[]) {
         if (!accounts) {
             this.link.removeAllListeners('block');
             this.link.removeAllListeners('fiatRates');
@@ -232,12 +229,12 @@ export default class Blockchain {
         return this.link.unsubscribe({ type: 'accounts', accounts });
     }
 
-    async unsubscribeFiatRates(): Promise<any> {
+    async unsubscribeFiatRates() {
         this.link.removeAllListeners('fiatRates');
         return this.link.unsubscribe({ type: 'fiatRates' });
     }
 
-    async pushTransaction(tx: string): Promise<string> {
+    async pushTransaction(tx: string) {
         return await this.link.pushTransaction(tx);
     }
 
@@ -249,16 +246,17 @@ export default class Blockchain {
 }
 
 const instances: Blockchain[] = [];
+const customBackends: { [coin: string]: CoinInfo } = {};
 
-const remove = (backend: Blockchain): void => {
-    const index: number = instances.indexOf(backend);
+export const remove = (backend: Blockchain) => {
+    const index = instances.indexOf(backend);
     if (index >= 0) {
         instances.splice(index, 1);
     }
 };
 
-export const find = (name: string): ?Blockchain => {
-    for (let i: number = 0; i < instances.length; i++) {
+export const find = (name: string) => {
+    for (let i = 0; i < instances.length; i++) {
         if (instances[i].coinInfo.name === name) {
             return instances[i];
         }
@@ -266,11 +264,20 @@ export const find = (name: string): ?Blockchain => {
     return null;
 };
 
-export const initBlockchain = async (coinInfo: $ElementType<Options, 'coinInfo'>, postMessage: $ElementType<Options, 'postMessage'>) => {
-    let backend: ?Blockchain = find(coinInfo.name);
+export const setCustomBackend = (coinInfo: CoinInfo, blockchainLink: $ElementType<CoinInfo, 'blockchainLink'>) => {
+    if (!blockchainLink) {
+        delete customBackends[coinInfo.shortcut];
+    } else {
+        customBackends[coinInfo.shortcut] = coinInfo;
+        customBackends[coinInfo.shortcut].blockchainLink = blockchainLink;
+    }
+};
+
+export const initBlockchain = async (coinInfo: CoinInfo, postMessage: $ElementType<Options, 'postMessage'>) => {
+    let backend = find(coinInfo.name);
     if (!backend) {
         backend = new Blockchain({
-            coinInfo,
+            coinInfo: customBackends[coinInfo.shortcut] || coinInfo,
             postMessage,
         });
         try {
diff --git a/src/js/core/methods/blockchain/BlockchainDisconnect.js b/src/js/core/methods/blockchain/BlockchainDisconnect.js
index 877b60fa3..289996d84 100644
--- a/src/js/core/methods/blockchain/BlockchainDisconnect.js
+++ b/src/js/core/methods/blockchain/BlockchainDisconnect.js
@@ -29,11 +29,7 @@ export default class BlockchainDisconnect extends AbstractMethod {
             { name: 'coin', type: 'string', obligatory: true },
         ]);
 
-        let coinInfo: ?CoinInfo = getCoinInfo(payload.coin);
-        if (!coinInfo) {
-            coinInfo = getCoinInfo(payload.coin);
-        }
-
+        const coinInfo = getCoinInfo(payload.coin);
         if (!coinInfo) {
             throw NO_COIN_INFO;
         }
@@ -46,14 +42,11 @@ export default class BlockchainDisconnect extends AbstractMethod {
         };
     }
 
-    async run(): Promise<{ disconnected: true }> {
+    async run() {
         const backend = await findBlockchainBackend(this.params.coinInfo.name);
         if (backend) {
             backend.disconnect();
         }
-
-        return {
-            disconnected: true,
-        };
+        return { disconnected: true };
     }
 }
diff --git a/src/js/core/methods/blockchain/BlockchainEstimateFee.js b/src/js/core/methods/blockchain/BlockchainEstimateFee.js
index 63109d01f..d9037fc46 100644
--- a/src/js/core/methods/blockchain/BlockchainEstimateFee.js
+++ b/src/js/core/methods/blockchain/BlockchainEstimateFee.js
@@ -54,7 +54,7 @@ export default class BlockchainEstimateFee extends AbstractMethod {
                 ]);
             }
         }
-        const coinInfo: ?CoinInfo = getCoinInfo(payload.coin);
+        const coinInfo = getCoinInfo(payload.coin);
 
         if (!coinInfo) {
             throw NO_COIN_INFO;
diff --git a/src/js/core/methods/blockchain/BlockchainGetAccountBalanceHistory.js b/src/js/core/methods/blockchain/BlockchainGetAccountBalanceHistory.js
index 737a119cd..a1125e99b 100644
--- a/src/js/core/methods/blockchain/BlockchainGetAccountBalanceHistory.js
+++ b/src/js/core/methods/blockchain/BlockchainGetAccountBalanceHistory.js
@@ -37,7 +37,7 @@ export default class BlockchainGetAccountBalanceHistory extends AbstractMethod {
             { name: 'groupBy', type: 'number', obligatory: false },
         ]);
 
-        const coinInfo: ?CoinInfo = getCoinInfo(payload.coin);
+        const coinInfo = getCoinInfo(payload.coin);
         if (!coinInfo) {
             throw NO_COIN_INFO;
         }
diff --git a/src/js/core/methods/blockchain/BlockchainGetCurrentFiatRates.js b/src/js/core/methods/blockchain/BlockchainGetCurrentFiatRates.js
index 89630169d..95536e99e 100644
--- a/src/js/core/methods/blockchain/BlockchainGetCurrentFiatRates.js
+++ b/src/js/core/methods/blockchain/BlockchainGetCurrentFiatRates.js
@@ -29,7 +29,7 @@ export default class BlockchainGetCurrentFiatRates extends AbstractMethod {
             { name: 'coin', type: 'string', obligatory: true },
         ]);
 
-        const coinInfo: ?CoinInfo = getCoinInfo(payload.coin);
+        const coinInfo = getCoinInfo(payload.coin);
         if (!coinInfo) {
             throw NO_COIN_INFO;
         }
diff --git a/src/js/core/methods/blockchain/BlockchainGetFiatRatesForTimestamps.js b/src/js/core/methods/blockchain/BlockchainGetFiatRatesForTimestamps.js
index 97f129aec..3dc19a25b 100644
--- a/src/js/core/methods/blockchain/BlockchainGetFiatRatesForTimestamps.js
+++ b/src/js/core/methods/blockchain/BlockchainGetFiatRatesForTimestamps.js
@@ -29,7 +29,7 @@ export default class BlockchainGetFiatRatesForTimestamps extends AbstractMethod
             { name: 'coin', type: 'string', obligatory: true },
         ]);
 
-        const coinInfo: ?CoinInfo = getCoinInfo(payload.coin);
+        const coinInfo = getCoinInfo(payload.coin);
         if (!coinInfo) {
             throw NO_COIN_INFO;
         }
diff --git a/src/js/core/methods/blockchain/BlockchainGetTransactions.js b/src/js/core/methods/blockchain/BlockchainGetTransactions.js
index 7abc2f682..93e940f98 100644
--- a/src/js/core/methods/blockchain/BlockchainGetTransactions.js
+++ b/src/js/core/methods/blockchain/BlockchainGetTransactions.js
@@ -29,7 +29,7 @@ export default class BlockchainGetTransactions extends AbstractMethod {
             { name: 'coin', type: 'string', obligatory: true },
         ]);
 
-        const coinInfo: ?CoinInfo = getCoinInfo(payload.coin);
+        const coinInfo = getCoinInfo(payload.coin);
         if (!coinInfo) {
             throw NO_COIN_INFO;
         }
diff --git a/src/js/core/methods/blockchain/BlockchainSetCustomBackend.js b/src/js/core/methods/blockchain/BlockchainSetCustomBackend.js
new file mode 100644
index 000000000..7bedaf463
--- /dev/null
+++ b/src/js/core/methods/blockchain/BlockchainSetCustomBackend.js
@@ -0,0 +1,56 @@
+/* @flow */
+
+import AbstractMethod from '../AbstractMethod';
+import { validateParams } from '../helpers/paramsValidator';
+import { NO_COIN_INFO } from '../../../constants/errors';
+
+import { find as findBackend, remove as removeBackend, setCustomBackend, initBlockchain } from '../../../backend/BlockchainLink';
+import { getCoinInfo } from '../../../data/CoinInfo';
+import type { CoreMessage, CoinInfo } from '../../../types';
+
+type Params = {
+    coinInfo: CoinInfo;
+}
+
+export default class BlockchainSetCustomBackend extends AbstractMethod {
+    params: Params;
+
+    constructor(message: CoreMessage) {
+        super(message);
+        this.requiredPermissions = [];
+        this.info = '';
+        this.useDevice = false;
+        this.useUi = false;
+
+        const { payload } = message;
+
+        // validate incoming parameters
+        validateParams(payload, [
+            { name: 'coin', type: 'string', obligatory: true },
+            { name: 'blockchainLink', type: 'object' },
+        ]);
+
+        const coinInfo = getCoinInfo(payload.coin);
+        if (!coinInfo) {
+            throw NO_COIN_INFO;
+        }
+
+        setCustomBackend(coinInfo, payload.blockchainLink);
+
+        this.params = {
+            coinInfo,
+        };
+    }
+
+    async run() {
+        const current = await findBackend(this.params.coinInfo.name);
+        if (current) {
+            await current.disconnect();
+            removeBackend(current);
+
+            await initBlockchain(this.params.coinInfo, this.postMessage);
+        }
+
+        return true;
+    }
+}
diff --git a/src/js/core/methods/blockchain/BlockchainSubscribe.js b/src/js/core/methods/blockchain/BlockchainSubscribe.js
index f97531c57..da4eb9a8a 100644
--- a/src/js/core/methods/blockchain/BlockchainSubscribe.js
+++ b/src/js/core/methods/blockchain/BlockchainSubscribe.js
@@ -35,7 +35,7 @@ export default class BlockchainSubscribe extends AbstractMethod {
             ]);
         });
 
-        const coinInfo: ?CoinInfo = getCoinInfo(payload.coin);
+        const coinInfo = getCoinInfo(payload.coin);
         if (!coinInfo) {
             throw NO_COIN_INFO;
         }
@@ -49,7 +49,7 @@ export default class BlockchainSubscribe extends AbstractMethod {
         };
     }
 
-    async run(): Promise<{ subscribed: boolean }> {
+    async run() {
         const backend = await initBlockchain(this.params.coinInfo, this.postMessage);
         return backend.subscribe(this.params.accounts);
     }
diff --git a/src/js/core/methods/blockchain/BlockchainSubscribeFiatRates.js b/src/js/core/methods/blockchain/BlockchainSubscribeFiatRates.js
index 6e9a734b7..2ea04f1d9 100644
--- a/src/js/core/methods/blockchain/BlockchainSubscribeFiatRates.js
+++ b/src/js/core/methods/blockchain/BlockchainSubscribeFiatRates.js
@@ -29,7 +29,7 @@ export default class BlockchainSubscribeFiatRates extends AbstractMethod {
             { name: 'coin', type: 'string', obligatory: true },
         ]);
 
-        const coinInfo: ?CoinInfo = getCoinInfo(payload.coin);
+        const coinInfo = getCoinInfo(payload.coin);
         if (!coinInfo) {
             throw NO_COIN_INFO;
         }
@@ -43,7 +43,7 @@ export default class BlockchainSubscribeFiatRates extends AbstractMethod {
         };
     }
 
-    async run(): Promise<{ subscribed: boolean }> {
+    async run() {
         const backend = await initBlockchain(this.params.coinInfo, this.postMessage);
         return backend.subscribeFiatRates(this.params.currency);
     }
diff --git a/src/js/core/methods/blockchain/BlockchainUnsubscribe.js b/src/js/core/methods/blockchain/BlockchainUnsubscribe.js
index 7c2918eb4..b0bc691f0 100644
--- a/src/js/core/methods/blockchain/BlockchainUnsubscribe.js
+++ b/src/js/core/methods/blockchain/BlockchainUnsubscribe.js
@@ -37,7 +37,7 @@ export default class BlockchainUnsubscribe extends AbstractMethod {
             });
         }
 
-        const coinInfo: ?CoinInfo = getCoinInfo(payload.coin);
+        const coinInfo = getCoinInfo(payload.coin);
         if (!coinInfo) {
             throw NO_COIN_INFO;
         }
@@ -51,7 +51,7 @@ export default class BlockchainUnsubscribe extends AbstractMethod {
         };
     }
 
-    async run(): Promise<any> {
+    async run() {
         const backend = await initBlockchain(this.params.coinInfo, this.postMessage);
         return backend.unsubscribe(this.params.accounts);
     }
diff --git a/src/js/core/methods/blockchain/BlockchainUnsubscribeFiatRates.js b/src/js/core/methods/blockchain/BlockchainUnsubscribeFiatRates.js
index 75264c4b6..2b33d6e97 100644
--- a/src/js/core/methods/blockchain/BlockchainUnsubscribeFiatRates.js
+++ b/src/js/core/methods/blockchain/BlockchainUnsubscribeFiatRates.js
@@ -27,7 +27,7 @@ export default class BlockchainUnsubscribeFiatRates extends AbstractMethod {
             { name: 'coin', type: 'string', obligatory: true },
         ]);
 
-        const coinInfo: ?CoinInfo = getCoinInfo(payload.coin);
+        const coinInfo = getCoinInfo(payload.coin);
         if (!coinInfo) {
             throw NO_COIN_INFO;
         }
@@ -40,7 +40,7 @@ export default class BlockchainUnsubscribeFiatRates extends AbstractMethod {
         };
     }
 
-    async run(): Promise<any> {
+    async run() {
         const backend = await initBlockchain(this.params.coinInfo, this.postMessage);
         return backend.unsubscribeFiatRates();
     }
diff --git a/src/js/core/methods/index.js b/src/js/core/methods/index.js
index 4111493ad..4d1b29dd3 100644
--- a/src/js/core/methods/index.js
+++ b/src/js/core/methods/index.js
@@ -6,14 +6,15 @@ import AbstractMethod from './AbstractMethod';
 
 import BlockchainDisconnect from './blockchain/BlockchainDisconnect';
 import BlockchainEstimateFee from './blockchain/BlockchainEstimateFee';
-import BlockchainGetTransactions from './blockchain/BlockchainGetTransactions';
+import BlockchainGetAccountBalanceHistory from './blockchain/BlockchainGetAccountBalanceHistory';
 import BlockchainGetCurrentFiatRates from './blockchain/BlockchainGetCurrentFiatRates';
 import BlockchainGetFiatRatesForTimestamps from './blockchain/BlockchainGetFiatRatesForTimestamps';
-import BlockchainGetAccountBalanceHistory from './blockchain/BlockchainGetAccountBalanceHistory';
-import BlockchainSubscribeFiatRates from './blockchain/BlockchainSubscribeFiatRates';
-import BlockchainUnsubscribeFiatRates from './blockchain/BlockchainUnsubscribeFiatRates';
+import BlockchainGetTransactions from './blockchain/BlockchainGetTransactions';
+import BlockchainSetCustomBackend from './blockchain/BlockchainSetCustomBackend';
 import BlockchainSubscribe from './blockchain/BlockchainSubscribe';
+import BlockchainSubscribeFiatRates from './blockchain/BlockchainSubscribeFiatRates';
 import BlockchainUnsubscribe from './blockchain/BlockchainUnsubscribe';
+import BlockchainUnsubscribeFiatRates from './blockchain/BlockchainUnsubscribeFiatRates';
 import CardanoGetAddress from './CardanoGetAddress';
 import CardanoGetPublicKey from './CardanoGetPublicKey';
 import CardanoSignTransaction from './CardanoSignTransaction';
@@ -74,6 +75,7 @@ const classes: { [k: string]: any } = {
     'blockchainGetCurrentFiatRates': BlockchainGetCurrentFiatRates,
     'blockchainGetFiatRatesForTimestamps': BlockchainGetFiatRatesForTimestamps,
     'blockchainGetTransactions': BlockchainGetTransactions,
+    'blockchainSetCustomBackend': BlockchainSetCustomBackend,
     'blockchainSubscribe': BlockchainSubscribe,
     'blockchainSubscribeFiatRates': BlockchainSubscribeFiatRates,
     'blockchainUnsubscribe': BlockchainUnsubscribe,
diff --git a/src/js/data/CoinInfo.js b/src/js/data/CoinInfo.js
index 24810777b..cb8734d5f 100644
--- a/src/js/data/CoinInfo.js
+++ b/src/js/data/CoinInfo.js
@@ -165,7 +165,7 @@ const parseBitcoinNetworksJson = (json: JSON) => {
         const isBitcoin = shortcut === 'BTC' || shortcut === 'TEST';
         const hasTimestamp = shortcut === 'CPC' || shortcut === 'PPC' || shortcut === 'tPPC';
 
-        const network: $ElementType<BitcoinNetworkInfo, 'network'> = {
+        const network = {
             messagePrefix: coin.signed_message_header,
             bech32: coin.bech32_prefix,
             bip32: {
diff --git a/src/js/index.js b/src/js/index.js
index 8b5db64e8..839825c4a 100644
--- a/src/js/index.js
+++ b/src/js/index.js
@@ -57,6 +57,10 @@ const TrezorConnect: API = {
         return call({ method: 'blockchainGetTransactions', ...params });
     },
 
+    blockchainSetCustomBackend: params => {
+        return call({ method: 'blockchainSetCustomBackend', ...params });
+    },
+
     blockchainSubscribe: params => {
         return call({ method: 'blockchainSubscribe', ...params });
     },
diff --git a/src/js/types/__tests__/blockchain.js b/src/js/types/__tests__/blockchain.js
index b87a66f12..747581942 100644
--- a/src/js/types/__tests__/blockchain.js
+++ b/src/js/types/__tests__/blockchain.js
@@ -102,4 +102,17 @@ export const others = async () => {
     });
 
     TrezorConnect.blockchainDisconnect({ coin: 'btc' });
+
+    TrezorConnect.blockchainSetCustomBackend({
+        coin: 'btc',
+        blockchainLink: undefined,
+    });
+
+    TrezorConnect.blockchainSetCustomBackend({
+        coin: 'btc',
+        blockchainLink: {
+            type: 'blockbook',
+            url: ['https://btc1.trezor.io/'],
+        },
+    });
 };
diff --git a/src/js/types/api.js b/src/js/types/api.js
index 132eb1a99..f43822b82 100644
--- a/src/js/types/api.js
+++ b/src/js/types/api.js
@@ -94,6 +94,7 @@ export type API = {
     blockchainGetCurrentFiatRates: Method<Blockchain.BlockchainGetCurrentFiatRates, Blockchain.BlockchainTimestampedFiatRates>;
     blockchainGetFiatRatesForTimestamps: Method<Blockchain.BlockchainGetFiatRatesForTimestamps, Blockchain.BlockchainFiatRatesForTimestamps>;
     blockchainGetTransactions: Method<Blockchain.BlockchainGetTransactions, Blockchain.BlockchainTransactions>;
+    blockchainSetCustomBackend: Method<Blockchain.BlockchainSetCustomBackend, boolean>;
     blockchainSubscribe: Method<Blockchain.BlockchainSubscribe, Blockchain.BlockchainSubscribed>;
     blockchainSubscribeFiatRates: Method<Blockchain.BlockchainSubscribeFiatRates, Blockchain.BlockchainSubscribed>;
     blockchainUnsubscribe: Method<Blockchain.BlockchainSubscribe, Blockchain.BlockchainSubscribed>;
diff --git a/src/js/types/backend/blockchain.js b/src/js/types/backend/blockchain.js
index 3c4716be8..e99eb3dc6 100644
--- a/src/js/types/backend/blockchain.js
+++ b/src/js/types/backend/blockchain.js
@@ -144,6 +144,11 @@ export type BlockchainEstimatedFee = {
     levels: FeeLevel[];
 }
 
+export type BlockchainSetCustomBackend = {
+    coin: string;
+    blockchainLink: $PropertyType<CoinInfo, 'blockchainLink'>;
+}
+
 export type BlockchainEvent =
     | {
         type: typeof BLOCKCHAIN.CONNECT;
diff --git a/src/js/types/networks/coinInfo.js b/src/js/types/networks/coinInfo.js
index 3304dab78..9900cd6e8 100644
--- a/src/js/types/networks/coinInfo.js
+++ b/src/js/types/networks/coinInfo.js
@@ -1,131 +1,77 @@
 /* @flow */
+import type { Network } from '@trezor/utxo-lib';
 
 type CoinSupport = {
     connect: boolean;
-    // electrum not used,
     trezor1: string;
     trezor2: string;
-    // webwallet not used
-};
-
-// copy-paste from 'bitcoinjs-lib-zcash' module
-type Network = {
-    messagePrefix: string;
-    bech32: ?string;
-    bip32: {
-        public: number;
-        private: number;
-    };
-    pubKeyHash: number;
-    scriptHash: number;
-    wif: number;
-    dustThreshold: number;
-    coin: string;
 };
 
 type BlockchainLink = {
     type: string;
-    url: Array<string>;
+    url: string[];
 };
 
-type DefaultFees = {[level: 'High' | 'Normal' | 'Economy' | 'Low']: number};
+type BitcoinDefaultFees = {[level: 'High' | 'Normal' | 'Economy' | 'Low']: number};
 
-export type BitcoinNetworkInfo = {
-    type: 'bitcoin';
-    // address_type: in Network
-    // address_type_p2sh: in Network
-    // bech32_prefix: in Network
-    // consensus_branch_id in Network
-    // bip115: not used
-    // bitcore: not used
-    // blockbook: not used
-    blockchainLink: ?BlockchainLink;
-    blocktime: number;
-    cashAddrPrefix: ?string;
-    label: string; // this is human readable format, could be different from "name"
-    name: string; // this is Trezor readable format
+type Common = {
+    label: string; // Human readable format, label != name
+    name: string; // Trezor readable format
     shortcut: string;
-    // cooldown not used
+    slip44: number;
+    support: CoinSupport;
+    decimals: number;
+    blockchainLink?: BlockchainLink;
+    blocktime: number;
+    minFee: number;
+    maxFee: number;
+};
+
+export type BitcoinNetworkInfo = Common & {
+    type: 'bitcoin';
+    cashAddrPrefix?: string;
     curveName: string;
-    // decred not used
-    defaultFees: DefaultFees;
     dustLimit: number;
     forceBip143: boolean;
-    forkid: ?number;
-    // github: not used
+    forkid?: number;
     hashGenesisBlock: string;
-    // key not used
-    // maintainer: not used
     maxAddressLength: number;
     maxFeeSatoshiKb: number;
     minAddressLength: number;
     minFeeSatoshiKb: number;
-    // name: same as coin_label
+    defaultFees: BitcoinDefaultFees;
     segwit: boolean;
-    // signed_message_header: in Network
-    slip44: number;
-    support: CoinSupport;
-    // uri_prefix not used
-    // version_group_id: not used
-    // website: not used
-    // xprv_magic: in Network
+
     xPubMagic: number;
-    xPubMagicSegwitNative: ?number;
-    xPubMagicSegwit: ?number;
+    xPubMagicSegwitNative?: number;
+    xPubMagicSegwit?: number;
 
     // custom
     network: Network;
     isBitcoin: boolean;
     hasTimestamp: boolean;
-    minFee: number;
-    maxFee: number;
     // used in backend
     blocks?: number;
-    decimals: number;
 };
 
-export type EthereumNetworkInfo = {
+export type EthereumNetworkInfo = Common & {
     type: 'ethereum';
-    blockchainLink: ?BlockchainLink;
-    blocktime: number;
     chain: string;
     chainId: number;
-    // key not used
+    rskip60: boolean;
     defaultFees: {
         label: 'high' | 'normal' | 'low';
         feePerUnit: string;
         feeLimit: string;
     }[];
-    minFee: number;
-    maxFee: number;
-    label: string; // compatibility
-    name: string;
-    shortcut: string;
-    rskip60: boolean;
-    slip44: number;
-    support: CoinSupport;
-    // url not used
-    network: typeof undefined; // compatibility
-    decimals: number;
+    network: typeof undefined;
 };
 
-export type MiscNetworkInfo = {
+export type MiscNetworkInfo = Common & {
     type: 'misc' | 'nem';
-    blockchainLink: ?BlockchainLink;
-    blocktime: number;
     curve: string;
-    // key not used
-    defaultFees: DefaultFees;
-    minFee: number;
-    maxFee: number;
-    // links not used
-    label: string; // compatibility
-    name: string;
-    shortcut: string;
-    slip44: number;
-    support: CoinSupport;
-    network: typeof undefined; // compatibility
-    decimals: number;
+    defaultFees: BitcoinDefaultFees;
+    network: typeof undefined;
 };
 
 export type CoinInfo = BitcoinNetworkInfo | EthereumNetworkInfo | MiscNetworkInfo;
diff --git a/src/ts/types/__tests__/blockchain.ts b/src/ts/types/__tests__/blockchain.ts
index 31216391f..de08d693a 100644
--- a/src/ts/types/__tests__/blockchain.ts
+++ b/src/ts/types/__tests__/blockchain.ts
@@ -101,4 +101,17 @@ export const others = async () => {
     });
 
     TrezorConnect.blockchainDisconnect({ coin: 'btc' });
+
+    TrezorConnect.blockchainSetCustomBackend({
+        coin: 'btc',
+        blockchainLink: undefined,
+    });
+
+    TrezorConnect.blockchainSetCustomBackend({
+        coin: 'btc',
+        blockchainLink: {
+            type: 'blockbook',
+            url: ['https://btc1.trezor.io/'],
+        },
+    });
 };
diff --git a/src/ts/types/api.d.ts b/src/ts/types/api.d.ts
index c30b9b304..da5314245 100644
--- a/src/ts/types/api.d.ts
+++ b/src/ts/types/api.d.ts
@@ -85,6 +85,9 @@ export namespace TrezorConnect {
     function blockchainGetTransactions(
         params: P.CommonParams & Blockchain.BlockchainGetTransactions,
     ): P.Response<Blockchain.BlockchainTransactions>;
+    function blockchainSetCustomBackend(
+        params: P.CommonParams & Blockchain.BlockchainSetCustomBackend,
+    ): P.Response<boolean>;
     function blockchainSubscribe(
         params: P.CommonParams & Blockchain.BlockchainSubscribe,
     ): P.Response<Blockchain.BlockchainSubscribed>;
diff --git a/src/ts/types/backend/blockchain.d.ts b/src/ts/types/backend/blockchain.d.ts
index 98bac6998..d797ae70f 100644
--- a/src/ts/types/backend/blockchain.d.ts
+++ b/src/ts/types/backend/blockchain.d.ts
@@ -146,6 +146,11 @@ export interface BlockchainAccountBalanceHistory {
     fiatRate: number;
 }
 
+export interface BlockchainSetCustomBackend {
+    coin: string;
+    blockchainLink: CoinInfo['blockchainLink'];
+}
+
 export type BlockchainEvent =
     | {
         type: typeof BLOCKCHAIN.CONNECT;
diff --git a/src/ts/types/networks/coinInfo.d.ts b/src/ts/types/networks/coinInfo.d.ts
index c6e4cffb8..d99b22821 100644
--- a/src/ts/types/networks/coinInfo.d.ts
+++ b/src/ts/types/networks/coinInfo.d.ts
@@ -1,9 +1,7 @@
 export interface CoinSupport {
     connect: boolean;
-    // electrum not used,
     trezor1: string;
     trezor2: string;
-    // webwallet not used
 }
 
 // copy-paste from 'bitcoinjs-lib-zcash' module
@@ -29,45 +27,34 @@ export interface BlockchainLink {
 export type BitcoinDefaultFeesKeys = 'High' | 'Normal' | 'Economy' | 'Low';
 export type BitcoinDefaultFees = { [key in BitcoinDefaultFeesKeys]: number };
 
-export interface BitcoinNetworkInfo {
-    type: 'bitcoin';
-    // address_type: in Network
-    // address_type_p2sh: in Network
-    // bech32_prefix: in Network
-    // consensus_branch_id in Network
-    // bip115: not used
-    // bitcore: not used
-    // blockbook: not used
+type Common = {
+    label: string; // Human readable format, label != name
+    name: string; // Trezor readable format
+    shortcut: string;
+    slip44: number;
+    support: CoinSupport;
+    decimals: number;
     blockchainLink?: BlockchainLink;
     blocktime: number;
+    minFee: number;
+    maxFee: number;
+};
+
+export interface BitcoinNetworkInfo extends Common {
+    type: 'bitcoin';
     cashAddrPrefix?: string;
-    label: string; // this is human readable format, could be different from "name"
-    name: string; // this is Trezor readable format
-    shortcut: string;
-    // cooldown not used
     curveName: string;
-    // decred not used
-    defaultFees: BitcoinDefaultFees;
     dustLimit: number;
     forceBip143: boolean;
     forkid?: number;
-    // github: not used
     hashGenesisBlock: string;
-    // key not used
-    // maintainer: not used
     maxAddressLength: number;
     maxFeeSatoshiKb: number;
     minAddressLength: number;
     minFeeSatoshiKb: number;
-    // name: same as coin_label
+    defaultFees: BitcoinDefaultFees;
     segwit: boolean;
-    // signed_message_header: in Network
-    slip44: number;
-    support: CoinSupport;
-    // uri_prefix not used
-    // version_group_id: not used
-    // website: not used
-    // xprv_magic: in Network
+
     xPubMagic: number;
     xPubMagicSegwitNative?: number;
     xPubMagicSegwit?: number;
@@ -76,55 +63,28 @@ export interface BitcoinNetworkInfo {
     network: Network;
     isBitcoin: boolean;
     hasTimestamp: boolean;
-    minFee: number;
-    maxFee: number;
     // used in backend
     blocks?: number;
-    decimals: number;
 }
 
-export interface EthereumNetworkInfo {
+export interface EthereumNetworkInfo extends Common {
     type: 'ethereum';
-    blockchainLink?: BlockchainLink;
-    blocktime: number;
     chain: string;
     chainId: number;
-    // key not used
+    rskip60: boolean;
     defaultFees: Array<{
         label: 'high' | 'normal' | 'low';
         feePerUnit: string;
         feeLimit: string;
     }>;
-    minFee: number;
-    maxFee: number;
-    label: string; // compatibility
-    name: string;
-    shortcut: string;
-    rskip60: boolean;
-    slip44: number;
-    support: CoinSupport;
-    // url not used
-    network: typeof undefined; // compatibility
-    decimals: number;
+    network: typeof undefined;
 }
 
-export interface MiscNetworkInfo {
+export interface MiscNetworkInfo extends Common {
     type: 'misc' | 'nem';
-    blockchainLink?: BlockchainLink;
-    blocktime: number;
     curve: string;
-    // key not used
     defaultFees: BitcoinDefaultFees;
-    minFee: number;
-    maxFee: number;
-    // links not used
-    label: string; // compatibility
-    name: string;
-    shortcut: string;
-    slip44: number;
-    support: CoinSupport;
     network: typeof undefined; // compatibility
-    decimals: number;
 }
 
 export type CoinInfo = BitcoinNetworkInfo | EthereumNetworkInfo | MiscNetworkInfo;