leon-do

const stellarSdk = require("stellar-sdk")
stellarSdk.Network.useTestNetwork()
const blockchain = new stellarSdk.Server("https://horizon-testnet.stellar.org")

// get private key from https://portal.willet.io/
const serverKeyPair = stellarSdk.Keypair.fromSecret("SB3KVB6RN5MOJJUZFLRDZNWN67PZV6IF6L74PMSHJEXHX2ABVSJUZDVA")

// get server account info
const serverAccount = await blockchain.loadAccount(serverKeyPair.publicKey())

leon-do

// load user account
const userAccount = await blockchain.loadAccount(userPubKey)

// add a payment operation to the transaction
const transaction = new stellarSdk.TransactionBuilder(userAccount)
.addOperation(
  stellarSdk.Operation.payment({
    destination: escrowPubKey, // user sends to escrow account
    asset: stellarSdk.Asset.native(), // native is XLM
    amount: '5'  // user pays 5 XLM

leon-do

// load escrow account from pub key
const escrowAccount = await blockchain.loadAccount(escrowPubKey)

// build claim transaction with timelock
const tb = new stellarSdk.TransactionBuilder(escrowAccount, {
  timebounds: {
    minTime: Math.floor(Date.now() / 1000) + 3600, // this envelope is valid after 1 hour
    maxTime: 0
  }
})

leon-do

  const parsedFundEnvelope = new stellarSdk.Transaction('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')
  console.log(parsedFundEnvelope)

  const parsedRefundEnvelope = new stellarSdk.Transaction('AAAAAG+jj6fohSGRHoAzUjCP7OQHmOncSD1ACE4//TfKipT+AAAAyAAWV9kAAAABAAAAAQAAAABcKcYpAAAAAAAAAAAAAAAAAAAAAgAAAA

leon-do

// this is the private key for userPubKey GAN4MBSW4TPAJKQMEIJXKEUD4LHJDBHIC7ATYR2TGML2JJW3TWIY5Q6J
const userKeyPair = stellarSdk.Keypair.fromSecret("SCV777PRFRSPCIIKENFCAIS4C5DLEFEI7Y236OXEXMCXL4FBLSAV3G65")

const fundFromEnvelope = new stellarSdk.Transaction('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

leon-do

// load escrow account from pub key
const escrowAccount = await blockchain.loadAccount(escrowPubKey)

// build claim transaction
const transaction = new stellarSdk.TransactionBuilder(escrowAccount)
.addOperation(
  stellarSdk.Operation.accountMerge({
    destination: serverKeyPair.publicKey() // send XLM to server account
  })
)

leon-do

### Keybase proof

I hereby claim:

  * I am leon-do on github.
  * I am leondo (https://keybase.io/leondo) on keybase.
  * I have a public key ASDud5ea1NlXGrgDZ_vrl9rbfBGtX_gk3VeBExQB33PIdAo

To claim this, I am signing this object:

leon-do

<pre>
pragma solidity >=0.4.22 <0.6.0;

contract hello {

    function getHelloWorld () public returns (string memory) {
        return 'hello world';
    }

} 

leon-do

const express = require('express');
const session = require('express-session');
const { ExpressOIDC } = require('@okta/oidc-middleware');

const app = express();

// session support is required to use ExpressOIDC
app.use(session({
  secret: 'this should be secure',
  resave: true,

leon-do

git clone https://github.com/bitcoin/bitcoin.git
cd bitcoin
./autogen.sh
./configure
make