message: Remove unused imports and methods
diff: @@ -4,12 +4,6 @@ import Web3 from 'web3'
  import utils from 'ethereumjs-util'
  import queryString from 'query-string'
  -import {
  - verifyTxProof,
  - verifyReceiptProof,
  - verifyHeaderProof,
  -} from './helpers/proofs'
  -
  import RootChainArtifacts from '../artifacts/RootChain'
  import ChildERC20Artifacts from '../artifacts/ChildERC20'
  import ChildERC721Artifacts from '../artifacts/ChildERC721'
  @@ -470,10 +464,6 @@ export default class Matic {
  return txProof
  }
  - verifyTxProof(txProof) {
  - return verifyTxProof(txProof)
  - }
  -
  async getReceiptProof(txId) {
  const { proof: receiptProof } = await this._apiCall({
  url: `${this._syncerUrl}/tx/${txId}/receipt/proof`,
  @@ -482,10 +472,6 @@ export default class Matic {
  return receiptProof
  }
  - verifyReceiptProof(receiptProof) {
  - return verifyReceiptProof(receiptProof)
  - }
  -
  getHeaderObject(blockNumber) {
  return this._apiCall({
  url: `${this._watcherUrl}/header/included/${blockNumber}`,
  @@ -504,10 +490,6 @@ export default class Matic {
  return headerProof
  }
  - verifyHeaderProof(headerProof) {
  - return verifyHeaderProof(headerProof)
  - }
  -
  async withdraw(txId, options = {}) {
  // fetch trancation & receipt proof
  const [txProof, receiptProof] = await Promise.all([
  