message: Btc helper - delete useless code
diff: @@ -246,33 +246,7 @@ const estimateFeeValue = async (options: EstimateFeeValueOptions): Promise<any>
  return finalFeeValue
  }
  -const estimateFeeRateBitcoinfees = async ({ speed = 'fast' } = {}) => {
  - const defaultRate = constants.defaultFeeRates.btc.rate
  -
  - let apiResult
  -
  - try {
  - apiResult = await api.asyncFetchApi(`https://bitcoinfees.earn.com/api/v1/fees/recommended`)
  - } catch (err) {
  - console.error(`EstimateFeeRate: ${err.message}`)
  - return defaultRate[speed]
  - }
  -
  - const apiSpeeds = {
  - slow: `hourFee`,
  - normal: `halfHourFee`,
  - fast: `fastestFee`,
  - }
  -
  - const apiSpeed = apiSpeeds[speed] || apiSpeeds.normal
  - const apiRate = new BigNumber(apiResult[apiSpeed]).multipliedBy(1024)
  -
  - return apiRate.isGreaterThanOrEqualTo(DUST)
  - ? apiRate.toString()
  - : defaultRate[speed]
  -}
  -
  -const estimateFeeRateBlockcypher = async ({ speed = 'fast' } = {}) => {
  +const estimateFeeRate = async ({ speed = 'fast' } = {}) => {
  const link = config.feeRates.btc
  const defaultRate = constants.defaultFeeRates.btc.rate
  @@ -304,8 +278,6 @@ const estimateFeeRateBlockcypher = async ({ speed = 'fast' } = {}) => {
  : defaultRate[speed]
  }
  -const estimateFeeRate = estimateFeeRateBlockcypher
  -
  export default {
  calculateTxSize,
  estimateFeeValue,
  