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# git install
sudo apt-get install git

# java install
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

# scala install

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package ex

object EP extends App {

  trait IO[A] { self =>
    def run(): A
    def _map[B](f: A => B): IO[B]         = new IO[B] { override def run(): B = f(self.run())       }
    def _flatMap[B](f: A => IO[B]): IO[B] = new IO[B] { override def run(): B = f(self.run()).run() }
  }

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object LCB extends App {

  def get(url: String) = scala.io.Source.fromURL(url).mkString
  def blockAt(nodeHttp: String, blockHeight: Int) = get(nodeHttp + "/blocks/at/" + blockHeight)
  def nodeComparator(node1: String, node2: String)(h: Int): Boolean = blockAt(node1, h) == blockAt(node2, h)

  val TESTNET1 = "http://52.30.47.67:6869"
  val TESTNET2 = "http://52.28.66.217:6869"
  val TESTNET3 = "http://52.77.111.219:6869"
  val TESTNET4 = "http://52.51.92.182:6869"

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// resolvers += "Typesafe Repository" at "http://repo.typesafe.com/typesafe/releases/"

// libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0"
// libraryDependencies += "org.typelevel" %% "cats" % "0.9.0"
// libraryDependencies += "io.github.amrhassan" %% "scalacheck-cats" % "0.3.2" % Test


package ex

import cats._

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package ex

import scodec.{Codec, codecs}
import scodec.codecs.{Discriminated, uint8}

object ASD extends App {
  
  sealed trait Expr
  case class INT(i: Int)             extends Expr
  case class SUM(i1: Expr, i2: Expr) extends Expr

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Plan

https://medium.com/p/785311f58c2/

Prerequisites

0. Telegram chat https://t.me/waves_dev_workshops

1. install docker

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{-# STDLIB_VERSION 4 #-}
{-# CONTENT_TYPE DAPP #-}

 @Callable(inv)
 func foo() = {
  let a =
    (if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64''

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{-# STDLIB_VERSION 4 #-}
{-# CONTENT_TYPE DAPP #-}

 @Callable(inv)
 func foo() = {
  let a =
    (if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64'')) then 0 else 1)+(if (sigVerify(base64'',base64'',base64''

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[
  {
    "blocksize": 688,
    "signature": "5fKMzzXxVd3x8ZxjAugwBgpB4GavBEkw8Efyy3FsodvXMQ6zvWcZyXro3z87d3i3EYNxr16TueUHVCZnEPNEwLGN",
    "fee": 0,
    "generator": "3HPNckeuow7wxh9WEzAwMeyzrknvyVNhxTH",
    "generatorPublicKey": "2eEUvypDSivnzPiLrbYEW39SM8yMZ1aq4eJuiKfs4sEY",
    "transactions": [
      {
        "type": 1,