yutelin

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <secp256k1.h>

int main() {
    secp256k1_context* ctx;
    secp256k1_pubkey pubkey;
    const unsigned char *seckey = (unsigned  char*) "Secret Key Br0!";

yutelin

pragma solidity ^0.4.8;

contract NegativeCompoundCoin {
    address public _minter;
    // Ledger
    mapping (address => uint) public _balances;
    // Last interest duduction blocks, for checking how many periods apply
    mapping (address => uint) public _lastCalculated;
    // how many blocks per peroid.
    uint public _period;

yutelin

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

yutelin

    diff --git a/eth/fetcher/fetcher.go b/eth/fetcher/fetcher.go
    index d88d919..f03fd30 100644
    --- a/eth/fetcher/fetcher.go
    +++ b/eth/fetcher/fetcher.go
    @@ -34,7 +34,7 @@ import (
     const (
        arriveTimeout = 500 * time.Millisecond // Time allowance before an announced block is explicitlrd
        gatherSlack   = 100 * time.Millisecond // Interval used to collate almost-expired announces witfs
    -   fetchTimeout  = 5 * time.Second        // Maximum alloted time to return an explicitly requestebk
    +   fetchTimeout  = 1 * time.Second        // Maximum alloted time to return an explicitly requestebk

yutelin

//Reference: http://stackoverflow.com/questions/12051118/is-there-a-way-to-generate-qr-code-image-on-ios#comment48548881_22296488

import Foundation
import UIKit
extension String{
    var qrcode: CIImage {
        //let data = self.dataUsingEncoding(NSISOLatin1StringEncoding, allowLossyConversion: false)
        let data = self.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
        let filter = CIFilter(name: "CIQRCodeGenerator")
        filter.setValue(data, forKey: "inputMessage")

yutelin

import Foundation

extension NSUserDefaults {
    
    func stringForKey(defaultName: String, defaultValue: String) -> String{
        if let value = self.stringForKey(defaultName){
            return value
        } else {
            return defaultValue
        }

yutelin

import Foundation
import CryptoSwift

extension String {
 
    func aesEncrypt(key: String, iv: String) throws -> String{
        let data = self.dataUsingEncoding(NSUTF8StringEncoding)
        let enc = try AES(key: key, iv: iv, blockMode:.CBC).encrypt(data!.arrayOfBytes(), padding: PKCS7())
        let encData = NSData(bytes: enc, length: Int(enc.count))
        let base64String: String = encData.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0));

yutelin

require 'oauth2'
client_id = ENV['CLIENT_ID']
client_secret= ENV['CLIENT_SECRET']
redirect_uri = 'https://127.0.0.1' # this must match the url you set during registration
client_options = {
  site: 'https://api.maicoin.com',
  authorize_url: 'https://www.maicoin.com/oauth/authorize',
  token_url: 'https://www.maicoin.com/oauth/token'
}
client = OAuth2::Client.new(client_id, client_secret, client_options)

yutelin

def request_options (api_key, api_secret, verb, path, options={})
  base_uri = 'https://api.maicoin.com/v1'
  nonce = options[:nonce] || (Time.now.to_f * 1e6).to_i
  if [:get, :delete].include? verb
    request_options = {}
    path = "#{path}?#{URI.encode_www_form(options)}" if !options.empty?
    hmac_message = nonce.to_s + base_uri + path
  else
    request_options = {body: options.to_json}
    hmac_message = nonce.to_s + base_uri + path + options.to_json