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RT @bajodayo: Dear Investors, It’s Time To Face The Real Facts https://t.co/hi8oxV9OyJ via @nxter_org


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RT @Nxter_org: Don't let the heat get you! Relax with #Nxter News - July (1) in the shade #Russian: https://t.co/j1ynFO7Enp #Chinese: htt…


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Random Number Generator in Contracts

Ardor lightweight contracts have a fast and secure method for random number generation.Random Number Generator in Contracts. Image Credit: Nick Hillier from UnsplashBlockchain-based contracts often need to generate random numbers for use cases such as gaming, gambling, simulation and more.Furthermore, these random numbers must be non-predictable so that developers, users, and block generators cannot predict them in advance and use this knowledge to make a profit.The key to be able to generate reproducible non-predictable random numbers are:All nodes should use the same random number generator, this should be simple as long as all nodes use the same runtime engine such a JVM or EVM.All nodes should agree on the random seed; a unique number used to initialize the random number generator. As long as all nodes agree on the same seed, all nodes will generate the same reproducible sequence of random numbers.The seed should not be simple to predict in advance. If users can predict the seed they can adjust their actions to make the contract output favorable for their cause. For example, predict the chosen number in a roulette game.During normal operation, a blockchain generates data which is somewhat random like block ids or transaction ids. The problem is that a transaction id is simple to manipulate by the account submitting the transaction, and a block id is simple to manipulate by the block generator. This means that using this information alone to initialize a random seed will provide power users and block generators an unfair advantage.As we can see, since you cannot rely directly on data generated within the blockchain, generating this reproducible and non-predictable seed is not a simple task.You may ask, can we use some kind of Oracle contract to obtain random data from an external source (like random.org)? Sure we can, but this opens up other attack vectors like DNS spoofing or potential for a direct hack of random.org. In addition, it is expensive to write this data into the blockchain for later use by other contracts. With that in mind, who is financing the operation of this Oracle contract, and what are their motives?Another approach for generating random numbers, which is promoted by the Ethereum team, is Randao. The idea is to use a two-stage approach and a complex incentive structure to compensate users for registering random data on the blockchain. This idea is slow and expensive, and surely we can do better.Introducing the Ardor Lightweight Contract Random Seed GenerationFast forward to lightweight contracts. In the Ardor platform, we can use two properties unique to lightweight contracts.First, only specific nodes execute contracts. This provides us with a unique source of random data unavailable to other protocols, namely the contract runner node itself.Second, the ability to send encrypted messages is built natively into the Ardor blockchain. This allows users to provide random data directly to the contract runner account without revealing it to anyone else.Given these properties the contract can now compose the random seed from three different independent sources:The contract runner random seed, stored securely in the private node configuration.The trigger transaction encrypted seed, attached as an encrypted message to the transaction that only the contract runner account can decrypt.The block id, which only the the block generator can control.The contract runner concatenates and hashes these three sources of randomness together to generate a reproducible seed. This seed is difficult to predict as the account submitting the transaction and the block generator need to cooperate and collude with the contract runner. The block generator and the account triggering the contract cannot predict the random numbers alone.But as always with lightweight contracts, we still need to trust the contract runner not to cheat, and to verify this, the contract runner must share its secret random seed securely with a validator node before executing the contract. Validators can then repeat the seed calculation and verify that the contract runner indeed executed the contract stored in the blockchain and calculated the random seed according to the protocol. In this case, a multi-signature setup where the validator account needs to approve every transaction submitted by the contract runner provides extra protection.Lightweight contracts provide a simple and pragmatic solution to the complex problem of generating reproducible non-predictable random numbers.Learn more about Lightweight Contracts in Ardor.Random Number Generator in Contracts was originally published in Hacker Noon on Medium, where people are continuing the conversation by highlighting and responding to this story.

July 5, 2018, 7:42 p.m.
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Nxter News – Julio 2018 (I): La Fuerza Reside en las Diferencias, No en Las Similitudes

Julio (I)   ¡Bienvenidos apreciados Nexteros y resto de seguidores! Una realidad agradable e inspiradora es darse cuenta de que todos somos diferentes, lo cual es algo positivo. Nuestra comunidad se fortalece gracias su gran diversidad. Contamos con Nexteros activos en los EE.UU., Europa, China, Corea, Rusia y en muchos otros lugares en todo el ... Read more The post Nxter News – Julio 2018 (I): La Fuerza Reside en las Diferencias, No en Las Similitudes appeared first on NXTER.ORG.

July 5, 2018, 6:32 p.m.
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TWITTER

Business real use cases using the @ArdorPlatform. @_Mnemo ready to integrate @IGNISguide with one of their products… https://t.co/GUPH5DjUDk


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RT @CryptoManiaks: #Tuesdaytrivia What was the 1st PoS #Blockchain? --> It’s our next #crypto review, @NxtCommunity! Launched in 2013, by @…


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Dear Investors, It’s Time To Face The Real Facts

Many of the existing blockchain startups that are looking to raise money are not real businesses. Yes, they have ideas, often brilliant ones that almost sound too good to be true. And then… that’s it. Nothing but ideas put on paper with no clue on how to fully execute it to make the promised prototype. ... Read more The post Dear Investors, It’s Time To Face The Real Facts appeared first on NXTER.ORG.

July 5, 2018, 4:21 p.m.
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Nxter 新闻–2018 年7月 (I): 力量在于差异,而不是相似之处

七月(I)   欢迎,亲爱的Nxters和其他粉丝! 一个很好的鼓舞人心的事情是,每个人都是不同的, ... Read more The post Nxter 新闻–2018 年7月 (I): 力量在于差异,而不是相似之处 appeared first on NXTER.ORG.

July 5, 2018, 8:15 a.m.
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TWITTER

RT @OKEx_: NXT is now listed on OKEx. Trade now with BTC on our platform! @NxtCommunity https://t.co/KIc8Lb3uOu


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Nxter News – Июль 2018 (I): Сила кроется в различиях, а не в сходствах

Июль (I)   Добро пожаловать, дорогие Некстеры и другие последователи! Очень полезно для вдохновения осознать, что все мы разные и это очень хорошо. Наше сообщество укрепляется благодаря огромному разнообразию — у нас очень много активных некстеров в США, Европе, Китае, России и многих других странах по всему миру. Уникальным результатом этого многообразия является то, что ... Read more The post Nxter News – Июль 2018 (I): Сила кроется в различиях, а не в сходствах appeared first on NXTER.ORG.

July 4, 2018, 9:24 p.m.
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TWITTER

RT @lioryaffe: Join me at the Israel & Blockchain (Pizza & Beer) meetup https://t.co/bybSQVmQXO to learn more about the #Ardor blockchain s…


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A lot of Ardor and Nxt community members will be there! https://t.co/CBVXFw1NXN


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Tell us more! https://t.co/FSl8nB3cBF


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REDDIT

is any NXT member working on ARTAX?

is any NXT member working on ARTAX? https://github.com/artaxcommittee/XAX

/r/Nxt
July 3, 2018, 5:39 p.m.

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TWITTER

RT @AvdiuSazan: NXT Blockchain — What You Should Know https://t.co/g9UIaJdda4 $NXT #Blockchain #cryptocurrency https://t.co/FEi0mCyqjI


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RT @lioryaffe: Integration of @ChangeNOW_io into the $NXT wallet was implemented by @zhanghuasheng95, still waiting for our friends at @Cha…


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RT @Nxter_org: June's first #Nxter Newsletter is here > https://t.co/NUt3jaJPui #Triffic #ICO is live, #Jelurida has new developers, solve…


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Nxter News – July 2018 (I): Strength Lies In Differences, Not In Similarities

July (I)   Welcome, dear Nxters and other followers! A nice inspiring thing to realize is that everyone is different and that is a good thing. Our community is made stronger by the great diversity it contains – we have many active Nxters in the US, Europe, China, Korea, Russia, and many other places the ... Read more The post Nxter News – July 2018 (I): Strength Lies In Differences, Not In Similarities appeared first on NXTER.ORG.

July 3, 2018, 9:29 a.m.
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REDDIT

ConsensusPedia: An Encyclopedia of 29 Consensus Algorithms

https://i.redd.it/k3ihzxakwk711.jpg ConsensusPedia: An Encyclopedia of ***29 Consensus Algorithms***. Contains a ***detailed explanation of algorithms*** with ***their pros and cons*** and ***list of platforms using them***. Check it out here: [https://hackernoon.com/consensuspedia-an-encyclopedia-of-29-consensus-algorithms-e9c4b4b7d08f](https://hackernoon.com/consensuspedia-an-encyclopedia-of-29-consensus-algorithms-e9c4b4b7d08f)

/r/Nxt
July 2, 2018, 9:06 p.m.

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TWITTER

RT @OKEx_: Ardor (ARDR) is now live on OKEx! Start trading with BTC on our platform today! @ArdorPlatform https://t.co/Qs3jTFi7nx


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Nxter News – 2018년 6월 (4주차): 애벌레가 모든 일을 하지만, 사람들은 나비만 알아줍니다.

string(4) "post" string(4) "page" string(4) "post" string(4) "post" string(4) "post" string(4) "post" string(4) "post" string(4) "post" string(4) "post" June (IV)   친애하는 Nxter 구독자 및 팔로워 분들 환영합니다. 서사와 권력의 진화에 있어 매력적인 캐릭터를 만들어 주는 것은 바로 변화입니다. 그래서 변화는 중요합니다. 이번주 매거진의 제목처럼, 애벌레가 모든 일을 하지만 주목받는 것은 나비일 뿐입니다. 거지같은 사실이지만, 사실입니다. 여러분의 작은 노력을 통해 애벌레가 나비가 될 수 있습니다. Ardor / NXT는 홍보에 어려움을 격고 있는데요, 바로 ... Read more The post Nxter News – 2018년 6월 (4주차): 애벌레가 모든 일을 하지만, 사람들은 나비만 알아줍니다. appeared first on NXTER.ORG.

July 1, 2018, 3:58 p.m.
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Nxter News – 2018년 6월 (4주차): 애벌레가 모든 일을 하지만, 사람들은 나비만 알아줍니다.

June (IV)   친애하는 Nxter 구독자 및 팔로워 분들 환영합니다. 서사와 권력의 진화에 있어 매력적인 캐릭터를 만들어 주는 것은 바로 변화입니다. 그래서 변화는 중요합니다. 이번주 매거진의 제목처럼, 애벌레가 모든 일을 하지만 주목받는 것은 나비일 뿐입니다. 거지같은 사실이지만, 사실입니다. 여러분의 작은 노력을 통해 애벌레가 나비가 될 수 있습니다. Ardor / NXT는 홍보에 어려움을 격고 있는데요, 바로 ... Read more The post Nxter News – 2018년 6월 (4주차): 애벌레가 모든 일을 하지만, 사람들은 나비만 알아줍니다. appeared first on NXTER.ORG.

July 1, 2018, 3:58 p.m.
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Nxter News – Junio 2018 (IV): La Oruga hace Todo el Trabajo pero la Mariposa se Lleva Todo el Mérito

Junio (IV) ¡Bienvenidos apreciados Nexteros y resto de seguidores! Los cambios son importantes, nos ofrecen interesantes giros de los personajes en las novelas e impulsa la evolución. Tal y como sugiere nuestro título, puede que las orugas hagan todo el trabajo, pero son las mariposas las que se llevan todo el reconocimiento. Triste pero cierto. ... Read more The post Nxter News – Junio 2018 (IV): La Oruga hace Todo el Trabajo pero la Mariposa se Lleva Todo el Mérito appeared first on NXTER.ORG.

June 29, 2018, 4:23 p.m.
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Nxter News – Июнь 2018 (IV): Гусеница проделывает основную работу, но всеобщее внимание привлекает бабочка

Июнь (IV)   Добро пожаловать, дорогие Некстеры и другие последователи! Перемены важны, сильной личности они дают новые возможности и усиливают общее развитие. Как сказано в нашем заголовке, всю работу выполняет гусеница, однако почести достаются бабочке. Печально, но так и есть. Но не следует оставаться самодовольной гусеницей, если вы способны стать красивой бабочкой, приложив некоторые усилия. ... Read more The post Nxter News – Июнь 2018 (IV): Гусеница проделывает основную работу, но всеобщее внимание привлекает бабочка appeared first on NXTER.ORG.

June 29, 2018, 1:14 p.m.
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A Review of Dominium

I suspect I wasn’t the only Nxter to be caught off guard by the articles from several weeks ago describing how a company called Dominium will build a platform on Ardor for investing in, listing, and managing real estate. Here was a project that was simultaneously extremely ambitious and quite close to launch, with the ... Read more The post A Review of Dominium appeared first on NXTER.ORG.

June 29, 2018, 12:58 p.m.
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Nxter 新闻 – 2018年6月(IV):前人栽树后人乘凉

六月(IV)   欢迎,亲爱的Nxters和其他追随者! 变化很重要,它为叙事和权力演变提供了引人注 ... Read more The post Nxter 新闻 – 2018年6月(IV):前人栽树后人乘凉 appeared first on NXTER.ORG.

June 28, 2018, 2:35 a.m.
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REDDIT

NXT is listed on SimpleSwap, convenient and safe cryptocurrency exchanger!



/r/Nxt
June 27, 2018, 9:56 p.m.

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RT @madfox1234: Nxter’s Puzzle from @Nxter_org https://t.co/VGBiYaxxvW Solve the crossword below to get the 12 words in the passphrase of…


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RT @lioryaffe: It was speculated that one of the big challenges to make #Ardor a main stream platform for developers is the lack of support…


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Nxter News – June 2018 (IV): The Caterpillar Does All The Work, But The Butterfly Gets All The Publicity

June (IV)   Welcome, dear Nxters and other followers! Change is important, it provides for compelling character arcs in narratives and powers evolution. Like our title suggests, caterpillars might do all the work, but butterflies get all the credit. Sucks, but it is true. One should not be content being a complacent caterpillar when you ... Read more The post Nxter News – June 2018 (IV): The Caterpillar Does All The Work, But The Butterfly Gets All The Publicity appeared first on NXTER.ORG.

June 26, 2018, 9:59 a.m.
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Opened trading on Okex $NXT $ARDR #NXT #ARDOR #blockchain #OKEx https://t.co/8R0Hgm6OwQ https://t.co/HaxYskyrlm


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When you prune transactions it means that a new node which joins the network cannot calculate the…

When you prune transactions it means that a new node which joins the network cannot calculate the up to date account balances by re-validating all the transactions in the ledger since some transactions are not available anymore.This means that the node has to first obtain a snapshot of the balances from another node and validate it again with more nodes to see that there is no cheating about the snapshot itself.This means that before you can prune transactions all nodes need to agree about the existing account balances which existed before transactions were pruned.But if your network has no sync point like a specific block height or an agreed upon state of dag you cannot generate a snapshot that all nodes will agree upon.

June 26, 2018, 8:30 a.m.
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Even two nodes working on the same internal network will sometimes create forks when both nodes…

Even two nodes working on the same internal network will sometimes create forks when both nodes generate a block at the same time independently. At some point, each node will learn about the other node’s block and will resolve the fork, each blockchain protocol has a way to resolve these forks and agree about the correct order of blocks and transactions.

June 26, 2018, 8:25 a.m.
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In my view, the main problem is that nodes will see transactions in a different order so when one…

In my view, the main problem is that nodes will see transactions in a different order so when one node submits a transaction which references two older transactions (according to this node view), some nodes will receive this transaction before receiving the “old” transactions it references so won’t be able to process it. Assuming this happens under heavy transaction load, it is not difficult to see how the whole thing gets out of control with ever increasing number of transaction which are left not referenced in the DAG or cannot be added to the DAG because of missing dependencies.

June 26, 2018, 8:22 a.m.
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Same for Raiblocks (now Nano?)

Same for Raiblocks (now Nano?) is it infinitely scalable? What are the limiting factors? Did you try to loadtest it?

June 26, 2018, 8:11 a.m.
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RT @Jelurida: Our booth is ready for two upcoming days of exhibiting and promoting #Nxt, #Ardor and #Ignis at WEBIT.FESTIVAL Europe in Sofi…


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OKEx - #Ardor( $ARDR)、#NXT ( $NXT) Now Available 🚀🌕😎 https://t.co/j4g0jI9U3A https://t.co/byJC7mwGo1


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Nxter News – 2018년 6월 (3주차): 걷고 있을 때, 위대한 생각들에 대한 영감을 받습니다.

6월 (3주차)   친애하는 Nxter 구독자 및 팔로워 분들 환영합니다. 걷는 것은 건강에 좋습니다. 뿐만아니라 잡념을 없애주고, 혼자 생각 할수 있는 시간을 줍니다. 걸으면서 우리는 세상을 변화 시키는데 블럭체인을 어떻게 활용 할까를 고민 하거나 우주에 대한 생각을 할 수도 있습니다. 우주 좋네요. 우리가 우주로 걸어 갈 수 있을까요? 이 글을 읽은 후에 좋은 아이디어가 생긴다면 ... Read more The post Nxter News – 2018년 6월 (3주차): 걷고 있을 때, 위대한 생각들에 대한 영감을 받습니다. appeared first on NXTER.ORG.

June 23, 2018, 7:44 a.m.
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RT @lioryaffe: #NASDAQ follow up on the #jelurida #dominium cooperation to develop #Ardor based blockchain solutions for the real estate pr…


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RT @veronicatorras: Learning how to set up a smart contract with @ArdorPlatform with @albefero at the #Blockchain for #Business meetup in #…


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Nxter News – Juin 2018 (I): Un homme sans imagination est un homme sans ailes

Bienvenue, chers Nxters et autres fideles! Grâce à notre imagination nous disposons de nombreuses choses qui rendent notre vie meilleure, telles que le pain en tranches, les avions, les agrafes, la crème solaire et bien plus encore. La blockchain est ce genre de technologie, l’imagination d’une personne transformé en réalité. Autrefois, j’étais du genre à ... Read more The post Nxter News – Juin 2018 (I): Un homme sans imagination est un homme sans ailes appeared first on NXTER MAGAZINE.

June 20, 2018, 10:55 p.m.
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Nxter News – Junio 2018 (III): Todas las Grandes Ideas Surgen Mientras Caminamos

Junio (III)   ¡Bienvenidos apreciados Nexteros y resto de seguidores! Caminar es sano y, simplemente por ese motivo, todos deberíamos hacerlo. Caminar también te permite aclarar tus ideas y estar a solas con tus pensamientos. De este modo, cuando caminas puedes pensar en cómo usar la blockchain para cambiar el mundo, por ejemplo, o bien ... Read more The post Nxter News – Junio 2018 (III): Todas las Grandes Ideas Surgen Mientras Caminamos appeared first on NXTER.ORG.

June 20, 2018, 4:07 p.m.
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Nxter 新闻– 2018年6月 (III): 真正伟大的思想都是在行走中孕育出来的

六月(III)   欢迎,亲爱的Nxters和其他追随者! 散步是健康的,为此,每个人都应该这样做。 ... Read more The post Nxter 新闻– 2018年6月 (III): 真正伟大的思想都是在行走中孕育出来的 appeared first on NXTER.ORG.

June 20, 2018, 3:40 p.m.
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RT @veronicatorras: #blockchain use case w/ @ArdorPlatform: License Software Company, 2 partners (accounts), 1 software license (asset), sc…


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Nxter News – Июнь 2018 (III): Все по-настоящему великие мысли приходят во время прогулки

Июнь (III)   Добро пожаловать, дорогие Некстеры и другие последователи! Пешие прогулки полезны для здоровья, поэтому их можно рекомендовать всем без исключения. Кроме того, ходьба позволяет очистить голову и побыть наедине со своими мыслями. В качестве темы для размышлений на прогулке мы предлагаем подумать над тем, как изменить мир при помощи блокчейна.  А еще можно ... Read more The post Nxter News – Июнь 2018 (III): Все по-настоящему великие мысли приходят во время прогулки appeared first on NXTER.ORG.

June 20, 2018, 8:15 a.m.
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Global Property Platform Dominium Chooses Ardor Blockchain Technology

Global Property Platform Dominium Chooses Ardor Blockchain Technology Dominium has chosen Ardor over Ethereum and other blockchain technologies for its global property platform expected to be operational in over 120 countries by the end of 2018. Read more about Global Property Platform Dominium Chooses Ardor Blockchain Technology

June 19, 2018, 1:22 p.m.
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RT @lioryaffe: I just published “NXT POS Block Skipping Attack Myth” https://t.co/6lFOj9gxh2


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RT @Ardor_Nxt_Group: #Bitswift adds Transaction Verification to their network dashboard to help clients track data on the #blockchain. Read…


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Nxter News – June 2018 (III): All Truly Great Thoughts Are Conceived While Walking

June (III)   Welcome, dear Nxters and other followers! Walking is healthy, and for that alone everyone should do it. Walking also allows for you to clear your head and just be alone with your thoughts. When walking you can think about how to use blockchain to change the world, as a friendly suggestion – ... Read more The post Nxter News – June 2018 (III): All Truly Great Thoughts Are Conceived While Walking appeared first on NXTER.ORG.

June 18, 2018, 12:36 p.m.
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Nxter News – 2018년 6월 (2주차):세상을 바꿀 수 있다고 생각하는 미친사람들

6월 (2주차)   친애하는 Nxter 구독자 및 팔로워 분들 환영합니다! 사람들은 일상의 친숙함을 좋아하는 경향이 있지만, 세상을 변화시키는 것은 결국 “미친것 처럼 보이는 망상”입니다. 자전거 가게 주인이 사람이 날 수 있다고 생각했다면, 미친것처럼 보이겠지만 라이트 형제는 세상의 첫 비행기를 만들어냈습니다. 지구를 벗어나 다른 별로 갈 수 있다고 생각하는 것은 정신나간 생각같지만 우리는 결국 달에 착륙했습니다! 세상을 ... Read more The post Nxter News – 2018년 6월 (2주차):세상을 바꿀 수 있다고 생각하는 미친사람들 appeared first on NXTER.ORG.

June 17, 2018, 1:23 p.m.
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