diff --git a/rollup.config.js b/rollup.config.js
index 8a2ccbf..56fbf4c 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -10,12 +10,15 @@ export default {
     {
       file: 'dist/MerkleProof2019.js',
       format: 'cjs',
-      name: 'MerkleProof2019'
+      name: 'MerkleProof2019',
+      exports: 'named',
+      sourcemap: true
     },
     {
       file: 'dist/MerkleProof2019-es.js',
       format: 'es',
-      name: 'MerkleProof2019'
+      name: 'MerkleProof2019',
+      sourcemap: true
     }
   ],
   plugins: [
diff --git a/src/explorers/bitcoin/bitpay.ts b/src/explorers/bitcoin/bitpay.ts
index a64538e..b414586 100644
--- a/src/explorers/bitcoin/bitpay.ts
+++ b/src/explorers/bitcoin/bitpay.ts
@@ -1,11 +1,10 @@
 import { stripHashPrefix } from '../../utils/stripHashPrefix';
 import { timestampToDateObject } from '../../utils/date';
-import { ExplorerAPI, ExplorerURLs } from '../../models/Explorers';
+import { ExplorerAPI, ExplorerURLs, IParsingFunctionAPI } from '../../models/Explorers';
 import { TransactionData } from '../../models/TransactionData';
 import { TRANSACTION_APIS, TRANSACTION_ID_PLACEHOLDER } from '../../constants/api';
 import CONFIG from '../../constants/config';
 import { BLOCKCHAINS } from '../../constants/blockchains';
-import { IParsingFunctionAPI } from '../explorer';
 
 // TODO: use tests/explorers/mocks/mockBitpayResponse as type
 function parsingFunction ({ jsonResponse }: IParsingFunctionAPI): TransactionData {
diff --git a/src/explorers/bitcoin/blockcypher.ts b/src/explorers/bitcoin/blockcypher.ts
index ee7272d..df82b51 100644
--- a/src/explorers/bitcoin/blockcypher.ts
+++ b/src/explorers/bitcoin/blockcypher.ts
@@ -1,11 +1,10 @@
 import { stripHashPrefix } from '../../utils/stripHashPrefix';
 import { dateToUnixTimestamp } from '../../utils/date';
-import { ExplorerAPI, ExplorerURLs } from '../../models/Explorers';
+import { ExplorerAPI, ExplorerURLs, IParsingFunctionAPI } from '../../models/Explorers';
 import { TransactionData } from '../../models/TransactionData';
 import { TRANSACTION_APIS, TRANSACTION_ID_PLACEHOLDER } from '../../constants/api';
 import CONFIG from '../../constants/config';
 import { BLOCKCHAINS } from '../../constants/blockchains';
-import { IParsingFunctionAPI } from '../explorer';
 
 // TODO: use tests/explorers/mocks/mockBlockcypher as type
 function parsingFunction ({ jsonResponse }: IParsingFunctionAPI): TransactionData {
diff --git a/src/explorers/bitcoin/blockexplorer.ts b/src/explorers/bitcoin/blockexplorer.ts
index 8d5b4f3..25facd7 100644
--- a/src/explorers/bitcoin/blockexplorer.ts
+++ b/src/explorers/bitcoin/blockexplorer.ts
@@ -1,11 +1,10 @@
 import { stripHashPrefix } from '../../utils/stripHashPrefix';
 import { timestampToDateObject } from '../../utils/date';
-import { ExplorerAPI, ExplorerURLs } from '../../models/Explorers';
+import { ExplorerAPI, ExplorerURLs, IParsingFunctionAPI } from '../../models/Explorers';
 import { TransactionData } from '../../models/TransactionData';
 import { TRANSACTION_APIS, TRANSACTION_ID_PLACEHOLDER } from '../../constants/api';
 import { BLOCKCHAINS } from '../../constants/blockchains';
 import CONFIG from '../../constants/config';
-import { IParsingFunctionAPI } from '../explorer';
 
 // TODO: use tests/explorers/mocks/mockBlockexplorer as type
 function parsingFunction ({ jsonResponse }: IParsingFunctionAPI): TransactionData {
diff --git a/src/explorers/bitcoin/blockstream.ts b/src/explorers/bitcoin/blockstream.ts
index 8c85239..74a00cf 100644
--- a/src/explorers/bitcoin/blockstream.ts
+++ b/src/explorers/bitcoin/blockstream.ts
@@ -1,10 +1,9 @@
 import { stripHashPrefix } from '../../utils/stripHashPrefix';
 import { timestampToDateObject } from '../../utils/date';
-import { ExplorerAPI, ExplorerURLs } from '../../models/Explorers';
+import { ExplorerAPI, ExplorerURLs, IParsingFunctionAPI } from '../../models/Explorers';
 import { TransactionData } from '../../models/TransactionData';
 import { TRANSACTION_APIS, TRANSACTION_ID_PLACEHOLDER } from '../../constants/api';
 import { BLOCKCHAINS } from '../../constants/blockchains';
-import { IParsingFunctionAPI } from '../explorer';
 
 // TODO: use tests/explorers/mocks/mockBlockstreamResponse as type
 function parsingFunction ({ jsonResponse }: IParsingFunctionAPI): TransactionData {
diff --git a/src/explorers/ethereum/blockcypher.ts b/src/explorers/ethereum/blockcypher.ts
index d2ebbae..3798932 100644
--- a/src/explorers/ethereum/blockcypher.ts
+++ b/src/explorers/ethereum/blockcypher.ts
@@ -2,11 +2,10 @@ import { stripHashPrefix } from '../../utils/stripHashPrefix';
 import { BLOCKCHAINS } from '../../constants/blockchains';
 import { TransactionData } from '../../models/TransactionData';
 import { TRANSACTION_APIS, TRANSACTION_ID_PLACEHOLDER } from '../../constants/api';
-import { ExplorerAPI, ExplorerURLs } from '../../models/Explorers';
+import { ExplorerAPI, ExplorerURLs, IParsingFunctionAPI } from '../../models/Explorers';
 import CONFIG from '../../constants/config';
 import { dateToUnixTimestamp } from '../../utils/date';
 import { prependHashPrefix } from '../../utils/prependHashPrefix';
-import { IParsingFunctionAPI } from '../explorer';
 
 const serviceURL: ExplorerURLs = {
   main: `https://api.blockcypher.com/v1/eth/main/txs/${TRANSACTION_ID_PLACEHOLDER}?limit=500`,
diff --git a/src/explorers/ethereum/etherscan.ts b/src/explorers/ethereum/etherscan.ts
index ad809e8..546fedf 100644
--- a/src/explorers/ethereum/etherscan.ts
+++ b/src/explorers/ethereum/etherscan.ts
@@ -4,9 +4,8 @@ import { buildTransactionServiceUrl } from '../../services/transaction-apis';
 import { BLOCKCHAINS, isTestChain, SupportedChains } from '../../constants/blockchains';
 import { TransactionData } from '../../models/TransactionData';
 import { TRANSACTION_APIS, TRANSACTION_ID_PLACEHOLDER } from '../../constants/api';
-import { ExplorerAPI, ExplorerURLs } from '../../models/Explorers';
+import { ExplorerAPI, ExplorerURLs, IParsingFunctionAPI } from '../../models/Explorers';
 import CONFIG from '../../constants/config';
-import { IParsingFunctionAPI } from '../explorer';
 
 const MAIN_API_BASE_URL = 'https://api.etherscan.io/api?module=proxy';
 const TEST_API_BASE_URL = 'https://api-ropsten.etherscan.io/api?module=proxy';
diff --git a/src/explorers/explorer.ts b/src/explorers/explorer.ts
index 14e1045..85f4856 100644
--- a/src/explorers/explorer.ts
+++ b/src/explorers/explorer.ts
@@ -2,7 +2,7 @@ import { buildTransactionServiceUrl } from '../services/transaction-apis';
 import { request } from '../services/request';
 import { isTestChain, SupportedChains } from '../constants/blockchains';
 import { TransactionData } from '../models/TransactionData';
-import { ExplorerAPI } from '../models/Explorers';
+import { ExplorerAPI, TExplorerFunctionsArray } from '../models/Explorers';
 import { explorerApi as EtherscanApi } from './ethereum/etherscan';
 import { explorerApi as BlockCypherETHApi } from './ethereum/blockcypher';
 import { explorerApi as BlockExplorerApi } from './bitcoin/blockexplorer';
@@ -10,21 +10,6 @@ import { explorerApi as BlockstreamApi } from './bitcoin/blockstream';
 import { explorerApi as BlockCypherBTCApi } from './bitcoin/blockcypher';
 import { explorerApi as BitPayApi } from './bitcoin/bitpay';
 
-export type TExplorerFunctionsArray = Array<{
-  getTxData: (transactionId: string, chain?: SupportedChains) => Promise<TransactionData>;
-  priority?: number;
-}>;
-export interface IParsingFunctionAPI {
-  jsonResponse?: any; // the response from the service when called as rest
-  chain?: SupportedChains; // TODO: look at how to deprecate this. Only used in etherscan
-  key?: string; // identification key to pass to the service -> TODO: can this be merged into the serviceUrl? Only used in etherscan
-  keyPropertyName?: string; // the key property to associate with the identification key -> TODO: can this be merged into the serviceUrl? Only used in etherscan
-  transactionId?: string; // when using in RPCs we pass the tx id to look up since these functions are responsible for service lookup
-  serviceUrl?: string; // the distant service url
-}
-export type TExplorerParsingFunction = ((data: IParsingFunctionAPI) => TransactionData) |
-((data: IParsingFunctionAPI) => Promise<TransactionData>);
-
 export function explorerFactory (TransactionAPIArray: ExplorerAPI[]): TExplorerFunctionsArray {
   return TransactionAPIArray
     .map(explorerAPI => (
diff --git a/src/explorers/index.ts b/src/explorers/index.ts
index 0ce1623..0081cbe 100644
--- a/src/explorers/index.ts
+++ b/src/explorers/index.ts
@@ -1,11 +1,10 @@
 import {
   BitcoinTransactionAPIArray as BitcoinExplorers,
   EthereumTransactionAPIArray as EthereumExplorers,
-  explorerFactory,
-  TExplorerFunctionsArray
+  explorerFactory
 } from './explorer';
 import { TRANSACTION_APIS } from '../constants/api';
-import { ExplorerAPI } from '../models/Explorers';
+import { ExplorerAPI, TExplorerFunctionsArray } from '../models/Explorers';
 import { ethereumRPCParsingFunction } from './rpc/ethereum';
 import { bitcoinRPCParsingFunction } from './rpc/bitcoin';
 
diff --git a/src/explorers/rpc/bitcoin.ts b/src/explorers/rpc/bitcoin.ts
index ebf3855..0e448f9 100644
--- a/src/explorers/rpc/bitcoin.ts
+++ b/src/explorers/rpc/bitcoin.ts
@@ -2,7 +2,7 @@ import { TransactionData } from '../../models/TransactionData';
 import { stripHashPrefix } from '../../utils/stripHashPrefix';
 import { timestampToDateObject } from '../../utils/date';
 import { request } from '../../services/request';
-import { IParsingFunctionAPI } from '../explorer';
+import { IParsingFunctionAPI } from '../../models/Explorers';
 
 export async function bitcoinRPCParsingFunction ({ serviceUrl, transactionId }: IParsingFunctionAPI): Promise<TransactionData> {
   const getRawTransactionParams = {
diff --git a/src/explorers/rpc/ethereum.ts b/src/explorers/rpc/ethereum.ts
index c872d2d..d61366c 100644
--- a/src/explorers/rpc/ethereum.ts
+++ b/src/explorers/rpc/ethereum.ts
@@ -1,7 +1,7 @@
 import { TransactionData } from '../../models/TransactionData';
 import { stripHashPrefix } from '../../utils/stripHashPrefix';
 import { request } from '../../services/request';
-import { IParsingFunctionAPI } from '../explorer';
+import { IParsingFunctionAPI } from '../../models/Explorers';
 
 export async function ethereumRPCParsingFunction ({ serviceUrl, transactionId }: IParsingFunctionAPI): Promise<TransactionData> {
   const transactionByHashParams = {
diff --git a/src/helpers/lookForTx.ts b/src/helpers/lookForTx.ts
index 9c49b04..59ac547 100644
--- a/src/helpers/lookForTx.ts
+++ b/src/helpers/lookForTx.ts
@@ -2,8 +2,8 @@ import { SupportedChains, BLOCKCHAINS } from '../constants/blockchains';
 import CONFIG from '../constants/config';
 import PromiseProperRace from './promiseProperRace';
 import { TransactionData } from '../models/TransactionData';
-import { TExplorerFunctionsArray } from '../explorers/explorer';
 import { TExplorerAPIs } from '../explorers';
+import { TExplorerFunctionsArray } from '../models/Explorers';
 
 export function getExplorersByChain (chain: SupportedChains, explorerAPIs: TExplorerAPIs): TExplorerFunctionsArray {
   switch (chain) {
diff --git a/src/models/Explorers.ts b/src/models/Explorers.ts
index a8e6df7..2545b7d 100644
--- a/src/models/Explorers.ts
+++ b/src/models/Explorers.ts
@@ -1,11 +1,27 @@
 import { TRANSACTION_APIS } from '../constants/api';
-import { TExplorerParsingFunction } from '../explorers/explorer';
+import { SupportedChains } from '../constants/blockchains';
+import { TransactionData } from './TransactionData';
 
 export interface ExplorerURLs {
   main: string;
   test: string;
 }
 
+export type TExplorerFunctionsArray = Array<{
+  getTxData: (transactionId: string, chain?: SupportedChains) => Promise<TransactionData>;
+  priority?: number;
+}>;
+export interface IParsingFunctionAPI {
+  jsonResponse?: any; // the response from the service when called as rest
+  chain?: SupportedChains; // TODO: look at how to deprecate this. Only used in etherscan
+  key?: string; // identification key to pass to the service -> TODO: can this be merged into the serviceUrl? Only used in etherscan
+  keyPropertyName?: string; // the key property to associate with the identification key -> TODO: can this be merged into the serviceUrl? Only used in etherscan
+  transactionId?: string; // when using in RPCs we pass the tx id to look up since these functions are responsible for service lookup
+  serviceUrl?: string; // the distant service url
+}
+export type TExplorerParsingFunction = ((data: IParsingFunctionAPI) => TransactionData) |
+((data: IParsingFunctionAPI) => Promise<TransactionData>);
+
 export interface ExplorerAPI {
   serviceURL?: string | ExplorerURLs;
   priority?: 0 | 1 | -1; // 0: custom APIs will run before the default APIs, 1: after, -1: reserved to default APIs