Developers Club geek daily blog

Децентрализованная биржа ? уже полгода в строю

2 years, 3 months ago
Привет! Сегодня я расскажу вам про децентрализованную криптовалютную биржу. То есть, технологию, с которой вы можете торговать напрямую с другими пользователями, без необходимости доверять свои средства посреднику-бирже. Да-да, она уже реализована и работает аж с апреля. Называется Asset Exchange.



Для меня было удивлением узнать, что даже многие энтузиасты криптовалют не знают о ней, и что она ни разу не упоминалась на Хабре. В то время как это и интереснейшая технология, и стремительно растущий финансовый рынок.

Про NXT уже многие слышали. Вкратце: это не форк Bitcoin, а отдельно написанная криптовалюта, работающая на принципе Proof-of-Stake. Ей уже около года, и подробнее я о ней уже рассказывал почти год назад. На блокчейне NXT уже построены многие интересные фишки:
  • Alias-ы ? аналог идеи Namecoin;
  • можно слать и получать шифрованные сообщения на NXT-адрес прямо в клиенте;
  • Asset Exchange ? децентрализованная биржа активов, о которой я сегодня расскажу;
  • и даже Digital Good Store ? децентрализованная торговая площадка, о которой я расскажу в другой статье.

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Моя реализация Java библиотеки для биржи BTC-e

2 years, 3 months ago
После начала торговли на BTC-e я заметил довольно удачное API. Его возможности вполне можно направить на благое дело. А именно ? на создание торговых ботов и мобильные клиенты. Про ботов понятно, а вот клиент под Android понадобился довольно скоро, но на маркете тогда их вообще не нашлось. А когда библиотека была дописана (да да, кода в ней мало, но получился долгострой), приложения хоть и появились, но были все равно какие-то не такие. Итак, если вам интересно узнать, что же у меня получилось и насколько это может быть полезно вам ? прошу под кат.

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Назад в будущее: проверка работоспособности торгового робота с помощью исторических данных

2 years, 3 months ago
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Ранее мы уже рассматривали вопрос об обязательных этапах разработки торговой стратегии для работы на фондовом рынке. Одной из наиболее важных стадий является тестирование производительности стратегии на исторических данных ? бэктестинг. Сегодня мы поговорим именно о нем.

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How to buy gold?

2 years, 3 months ago
Pension for Itshnika.
Here it would be necessary to write? and what to do in old age??? on the state of nedyozha any?? presently everyone has to...? and other bla-bla-bla and bi-bi-bi. But me laziness, therefore? at once to business.

In what main value of gold? That it valuably in itself. Simply here because it is gold. Many people appreciate filthy lucre much more expensively, than it really costs? it is purely instinctive rush.? Eternal and inherent value?, as any marketing specialist will tell.

And still?
And still gold moves in antiphase with the stock market. That is, when in economy typhoon? all investors run in gold, as the most reliable asset. Well and vice versa, naturally? It does gold by the ideal tool for creation? portfolio of the gawk?.

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Problems of high-frequency trading lie more deeply, than it seems

2 years, 3 months ago
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? The stock market of the United States, the most model financial site of world capitalism, is infected with fraud?. Here that Michael Lewis (Michael Lewis) has declared to Steve Croft (Steve Kroft) in evening air of TV show of the CBS channel? 60 Minutes?. Michael Lewis has selected witty, though slightly and exaggerated, way to express the main subject of the new significant book? Fast boys? (Flash Boys). It is the provocative book about shocking methods of work of high-frequency trading.

Well thought over story of Mr. Lewis focuses attention on the perverted Wall Street system which has provided opportunity to some professional investors for several hundred millions of dollars to place the computer servers as it is possible closer to stock exchanges. It allows them to overtake other players of the exchange on some milliseconds.

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To the customs duties on sendings after all to be, and soon

2 years, 3 months ago
Such output follows from the draft budget of the Russian Federation for 2015-2017, in general already approved by the government. As write RIA Novosti, at the expense of duties on Internet trade replenishment of the budget in the amount of 60 billion rubles is planned. And very much expect this money.



It is interesting, what receipt of funds is planned by the uniform? on 20 billion a year. It means that duties most likely will enter soon as prior to the beginning of 2015 there were only three months. And as we see higher, the income for 2015 should not be below the income 2016 and 2017.

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Spain considers Bitcoin as electronic payment system

2 years, 3 months ago
The government of Spain has issued new rules which define Bitcoin as electronic payment system.

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Definition of the status of Bitcoin at the state level has begun at the request of the Spanish Bitcoin-startup Coinffeine.
In April of this year of Abanlex, the law firm representing Coinffeine has addressed to the Spanish Ministry of Finance and public administration, and also to the congress, for definition of the status of Bitcoin from the point of view of the law.

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As I have tried five payment systems for the site

2 years, 3 months ago


More than three years ago I have written post about choice of payment system for acceptance of payments on the last project. Since then has passed a lot of time and a lot of things in ways of acceptance of payments have changed. Now I will tell as did acceptance of payments on the site poiskvps.ru.

Now the task looks in the same way: I needed to make so that the natural person could accept payments at users in automatic mode on the site, having small turns.

From the technical point of view at payment the following operations are executed: to the user the invoice for payment is drawn up, the user selects convenient payment method, passes to the site of payment system, makes payment and returns to the site. In case of successful payment the payment system notifies shop that the user has paid the bill.


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The course Bitcoin again grows: Paypal has allowed payment by bitcoins in the American online stores

2 years, 3 months ago
Paypal got accustomed to bitcoins earlier, foretelling that they will play important role in the future of their business. Now, when large players? from? Overstoka? to? Wikipedias?? accept cryptocurrency as transactions and donations, game has joined Paypal.


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How-to: Creation of trade robots on TradeScript vol. 2

2 years, 3 months ago
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We repeatedly told about algorithmic trade at the exchange and creation of trade robots. We mentioned and what the most part of participants of stock market all the same uses the trade terminal? for commission of operations manually or control of operations of the robot.

However even those dealers who work only hands in the terminal, sometimes want to automate some processes and to program trade strategy. One of ways of similar automation is writing of trade robots in the scripting TradeScript language which is built in the terminal for trade at the SmatX exchange (process of its creation is described in separate topic).

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