sign.rb

  def callUpdateToKyberAPI(email, addresses, timestamps)
    key = Rails.application.secrets.kyber_key
    nonce = (Time.now.to_f * 1000).to_i
    msg = URI.encode_www_form(
      [[:addresses, addresses], [:nonce, nonce], [:timestamps, timestamps], [:user, email]])
    uri = URI.parse("https://mainnet-data.kyber.network/update-user-addresses")
    https = Net::HTTP.new(uri.host,uri.port)
    https.use_ssl = true
    req = Net::HTTP::Post.new(
      uri.path, initheader = {
        'Content-Type' => 'application/x-www-form-urlencoded',
        'signed' => OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new('sha512'), key, msg)
      })
    req.body = msg
    res = https.request(req)
    JSON.parse(res.body)
  end