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Author Topic: [ANN] (QTUM) - A Scalable Smart Contract Platform w/ Proof of Stake  (Read 438932 times)
This is a self-moderated topic. If you do not want to be moderated by the person who started this topic, create a new topic. (2 posts by 2 users deleted.)
Papski
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April 09, 2017, 12:38:03 PM
 #3381

Any non Chinese exchange where we can buy Qtum from?

I think there is 1 exchange that they are claiming that is based in Canada but it is still owned by a Chinese guy probably still makes it Chinese.
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Qtum
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April 09, 2017, 04:08:51 PM
 #3382

Any non Chinese exchange where we can buy Qtum from?

The Crowdsale sold out in 5 days. When the main network is released in September, participants will be able to withdraw tokens from the exchanges.

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●▬●▬●▬● First UTXO Based PoS Smart Contract and DAPP Platform ●▬●▬●▬●
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Gleb Gamow
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April 09, 2017, 06:29:28 PM
 #3383

only thing matter is if dev can delivery the platform or not

otherwise no matter how many people invest, it may fall.

also it does not matter if someone like the project, someone do not like the project.

even right now, some people still think bitcoin is a scam

if dev can delivery the platform, Qtum will be the top5 coin in 1 year.

i will bet 10BTC on this.

welcome to join me.



Hey, you fuckin idiot! How many times does Qtum have to tell you that they're a nonprofit and that its token IS NOT AN INVESTMENT VEHICLE?
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April 10, 2017, 06:53:01 AM
 #3384

if Qtum can not be a top5 coin on coinmarketcap by April 9th 2018.

i will give 10BTC to who bet with me.


wanna bet for sure? Im up for it

ethought
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April 10, 2017, 08:44:02 AM
 #3385

Any non Chinese exchange where we can buy Qtum from?

The ICO is already finished.
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April 10, 2017, 09:20:27 AM
 #3386

They showed big numbers from exchanges who participated in the ICO and big names have attach their signature in there, but where are the TX ID`s or even the address that holds the 15 million worth of BTC, if your an investor provide a TX ID`s so we can follow where is your coins located.
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April 10, 2017, 12:54:28 PM
 #3387

only thing matter is if dev can delivery the platform or not

otherwise no matter how many people invest, it may fall.

also it does not matter if someone like the project, someone do not like the project.

even right now, some people still think bitcoin is a scam

if dev can delivery the platform, Qtum will be the top5 coin in 1 year.

i will bet 10BTC on this.

welcome to join me.



Hey, you fuckin idiot! How many times does Qtum have to tell you that they're a nonprofit and that its token IS NOT AN INVESTMENT VEHICLE?

you fuckin idiot Gleb. i will not help you anymore. you fuckin idiot!

running farm worldwide
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April 10, 2017, 12:54:51 PM
 #3388

if Qtum can not be a top5 coin on coinmarketcap by April 9th 2018.

i will give 10BTC to who bet with me.


wanna bet for sure? Im up for it

ok

then we need find an escrow.


running farm worldwide
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April 10, 2017, 02:59:58 PM
 #3389

if Qtum can not be a top5 coin on coinmarketcap by April 9th 2018.

i will give 10BTC to who bet with me.


wanna bet for sure? Im up for it

ok

then we need find an escrow.



Yassin is youre man....
https://bitcointalk.org/index.php?action=profile;u=222847
logictense
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April 10, 2017, 03:11:26 PM
 #3390

Lol what the hell 2018 is far away, we should have better bets here pertaining to what the value of ur favorite junk may be by the end of april 2017. That would be fun. These markets are really un-fucking-predictable, u never know how things could turn out tomorrow, let alone 2018 lol. Im still holding out hope that bitcoin will crash to 300 usd // now what?

Johnny00
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April 10, 2017, 05:39:17 PM
 #3391

if Qtum can not be a top5 coin on coinmarketcap by April 9th 2018.

i will give 10BTC to who bet with me.


wanna bet for sure? Im up for it

ok

then we need find an escrow.



Yassin is youre man....
https://bitcointalk.org/index.php?action=profile;u=222847

+ 1

I'm in for 1 BTC. i don't want to lock my funds up for a year as i already doubled it in three weeks


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April 11, 2017, 01:20:29 PM
 #3392

Too much rage on this thread Cheesy

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joelaaron16
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April 11, 2017, 04:33:09 PM
 #3393

Qtum Update:


Wednesday Night, February 1st, 10pm EST; 7pm PST we will be having a Q&A session on our Slack channel with Qtum team members.

Patrick Dai, our co-founder, will also be explaining details about the development status, white paper, crowd sale, future plans, and so forth.[/size]



Click here to join our Slack, currently there is about 550 members:




Do not hesitate to join, I have also joined, with the best team and professional then this project is perfect. Join now to start collaborating! With the Slack, you can message your team, share files, and get updates from the other tools you use daily. See the Slack in action in this video.
yes that's right if you are wanted to learn more about this project slacks will be the best way since the dev and the community can talk more info about the project and surely the dev are willing to provide all the details regarding how this would be a successful project incoming days.GL



more you  keen more you learn and do not be hesitate to ask or learn.
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April 12, 2017, 03:19:39 PM
 #3394

There is very little activity in this topic. A solid negative and a few pious believers in the success of this deception.
Qtum
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April 13, 2017, 01:07:20 AM
 #3395

This is an older article that was published in response to some questions asked about the Qtum project:

http://news.8btc.com/why-qtum-choose-utxo-model-and-the-benefits



Why Qtum Choose UTXO Model and the Benefits
JAN 18, 2017by PATRICK DAI in BLOCKCHAIN  11 0 986


I have read the Qtum whitepaper over last 1 hour so understanding may not be 100% but this is my assessment.

0. Basically it is just another bitcoin fork with extension to the bitcoin scripting language to support solidity contracts?



First of all, Qtum is far from being “just another bitcoin fork”. We have a vision for the Qtum project and one of the biggest and most professional teams ever seen in crypto with support from real world companies and investors. Our goals for Qtum go far beyond the crypto scene and it will be a top project, not just another fork.
Our choice of bitcoin core as a main base for Qtum is based on the fact that bitcoin is the most mature, stable and secure blockchain available, in comparison to ethereum, bitshares or others, which are still considered unstable with the numerous problems and security issues they had since they launched. In addition to bitcoin having the biggest support from the community which offers a large collection of tools and software related to bitcoin which can be used by quantum as well, in contrast to the other blockchains which sometimes lack even the simplest software (mobile wallets, stable desktop wallets …).
Also we use bitcoin script as a bridge between the EVM and regular transaction, the Qtum model was very well designed, and is much more complicated than you make it sound.

1. There is no compelling reason to choose UTXO over smart contract via balance.

It is like comparing a general journal vs a general ledger, which is better? The answer is it depends. I guess it is only UTXO because it is using a bitcoin fork and calling it UTXO as a feature is just a gimmick. In fact I suspect scalability becomes bigger problem since you need to maintain SPV to manage UTXO for multiple different states? Will be interesting to see how to implement wallets.
Does that make hyperledger better since they supports both utxo and balance?
Our choice of UTXO is simply choosing the best technology, there have been some efforts made through some articles to make the account model seem as performant and secure as the UTXO model, however, it’s not. Without going into much details, the account model is too naïve and simplistic and offers no parallelism, it always reminds me of the cup telephone transaction model.

For us, a hybrid model as the one used by Hyperledger was the wrong choice since it will cause us to be incompatible with neither bitcoin nor ethereum. In Qtum we have a priority to keep full compatibility with bitcoin which will allow us to implement future bitcoin BIPs to Qtum thus taking advantage of the developments done by the bitcoin core team and community.
For more details,please refer below:

1) If we wanted just a simple smart contract platform to build on top of, it would’ve been significantly easier for us to just fork Ethereum.

2) The UTXO allows for the SPV protocol to work. Ethereum currently does not have anything like SPV. There’s no way to run a simple wallet on Ethereum without downloading the entire blockchain, or trusting a centralized 3rd party.

3) The UTXO model is overall much more simple, and because it’s been used by Bitcoin, it has been thoroughly tested and proven to be secure. Although Ethereum’s account model is conceptually easy to understand, it requires more complexities and edge cases in order to secure it from replay and double spend attacks.

4) Scalibility should not be a problem for Qtum. Although contracts can create state changes etc, these state changes are not directly stored on the blockchain. Rather, state is considered the accumulation of all actions and differences created by executing each smart contract. This could admittingly make syncing the blockchain slower (because block processing will be slower than Bitcoin), but the other benefits provided are worth this performance hit. Furthermore, the only additional thing stored in the UTXO set right now is contract code, and contract-owned outputs (though their data becomes unimportant after the output is initially processed). There may be plans proposed later which prune the UTXO set’s stored data as well, to reduce the UTXO set size further.

5) SPV will work almost identically to how SPV wallets work today. For a quick summary, a light wallet downloads block headers, and then sends P2P nodes requests (using bloom filters) to get all transactions for each block matching the keys that this wallet own. Because the contract system creates normal transactions, this already works. IF you a contract sends funds to a SPV wallet, the SPV wallet will see these funds and can spend them, today. Our next step with SPV wallets would be to implement a workflow so that people can send money to a contract, while also picking which function and what data to send. We do not need to extend the SPV model to work for Qtum, it already works because of our focus on compatibility.

6) Regarding Hyperledger. I’m no expert on it, so I could be wrong. But I think that their support could end up being worst of both worlds. Now, anything wanting to interact with Hyperledger must be capable of dealing with the quirks of both models. From my understanding also, they only support either UTXO or Accounts on one ledger at a time also (though there is much functionality for messaging and sending things between these ledgers). So I do not think it makes Hyperledger’s model better, but rather more complex. Perhaps this complexity provides more power to Hyperledger’s model, but it also introduces more security concerns and increases the implementation cost of Hyperledger itself, and any application that uses it (due to to having to deal with both models)

2) It extended bitcoin script to accept solidity string but another company called CounterParty have already done it on the Bitcoin public blockchain without having to use a new public blockchain. So where is the need? Furthermore, will qtum have to constantly keep in sync with “solc” the solidity compiler to maintain compatibility?


— Qtum is very different from XCP, XCP uses bitcoin blockchain to store data, and the user have to run XCP software on top of that. Some major drawbacks are the cost of XCP transactions which increased so much that it threatens the whole project now and the complexity to build external software on top of XCP.
Qtum aims to offer an all-in-one solution, not based on any external possible points of failure.
For solc support, we made Qtum with that in mind, Qtum uses the exact same ethereum VM, so it will run any solidity compiled code, in the case of EVM updates, and we will be easily able to update it in Qtum as well.

3.Qtum is a new altcoin platform but there are enough ethereum, ripple and bitcoin out there. Why another one?

It is not a bridge as I was led to understand. It is another bitcoin fork.

— In addition to my previous reply about Qtum not being “just another bitcoin fork”, I would like to add that quantum is not the average altcoin, it will be one of the best, if not “the best” we have all the means for that, and we will do it.
You say it is not a bridge, but really it is. It is bridging the technology. We are taking what makes Bitcoin great, and what makes Ethereum great, and bringing them together as one. We expect to bridge not the actual monetary value (ie, the market cap) held in each coin, but rather the communities and separate interest. Right now there is a real divide between serious Ethereum users and developers, and Bitcoin users and developers. By aiming to be compatible with the technology involved with both, we hope to merge these communities and be an answer both for 1) Those who want Ethereum smart contracts, but are uncomfortable with the stability of the Ethereum account model and lack of protocol support such as SPV; and 2) Those who like Bitcoin, but are unhappy with it’s limitations for implementing smart contracts and more powerful types of transactions. We as a team are also tired of these copy-paste coins that people constantly make to try to get a quick buck, and we would not have chosen to make this it’s own altcoin if we had not weighed the cost and benefits very carefully.

4. What is the block confirmation time? Bitcoin is 10 minutes and Ethereum is 18 seconds?

— Ethereumblocktime of 18 seconds is a bit exaggerated and causes a lot of empty blocks and uncles thus bloating the blockchain with useless data (which resulted in the currently atrophied ethereumblockchain), and bitcoin block time of 10 minutes is a bit too long for a smart contracts platform. We aim to have a blocktime of 1 to 3 minutes for Qtum.


5.) I did not go too deep into the details of the POS but the protocol is similar to Peercoin’s DPOS and it maybe susceptible to coin age accumulation attack if the intention is to incentive to miners that leave their stake longer on the chain. In fact it should be the opposite to prevent long range attack, Bitfury and Vitalik has written good articles on the types of attacks it is susceptible to.


—- Qtum uses BCPoSv3.0 which has removed all major attack vectors, including coin age accumulation.In conclusion, Qtum will be the first standalone UTXO and PoS based smart contracts platform thus making use of the best available technologies to deliver an outstanding blockchain solution.

By Patrick Dai and Neil

About Patrick Dai: Cofounder of Qtum. Patrick is a Computer Science PhD candidate at CAS and has worked for Alibaba.

Neil: Qtum blockchain Architect ,Neil has 20 years experience developing software and has four years experience in the blockchain space. Neil has Master’s degree in Business Administration from ISCAE, but later specialized in computer science. Neil was also a professional poker player and speaks four languages.




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●▬●▬●▬● First UTXO Based PoS Smart Contract and DAPP Platform ●▬●▬●▬●
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April 13, 2017, 03:08:45 AM
 #3396

if Qtum can not be a top5 coin on coinmarketcap by April 9th 2018.

i will give 10BTC to who bet with me.


wanna bet for sure? Im up for it

ok

then we need find an escrow.



Yassin is youre man....
https://bitcointalk.org/index.php?action=profile;u=222847

+ 1

I'm in for 1 BTC. i don't want to lock my funds up for a year as i already doubled it in three weeks

ok great. then let's find an escrow.

and give the btc to the escrow before 1st of March of 2018.

running farm worldwide
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April 13, 2017, 03:11:02 AM
 #3397

Hi dev, any planning to make some team in different country? Maybe it would be batter to make some community in different world. Just some suggest to make this ICO will be rise much more.

only go further for better advancements and for some better scenario is not enough but work work and only work...


Team Qtum is convening to pen a reply to your thought provocative post.  Roll Eyes FWIW, they'll reply quicker to your post then to all others requesting txID(s).

seems Qtum start to response your questions man, check it





but also i still want to know about the development work.

also the comments on this big post?



any updates on the development work?

thank you Qtum!

running farm worldwide
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April 13, 2017, 06:16:03 AM
 #3398

Right now the developers are working to deliver the Test Network portion of the Roadmap.  This means taking the snapshot that was released before the Crowdsale and building it up into a git repository. So far there have been 2 projects that are looking to build on the Qtum platform, so they will require the technical documentation and assistance in order to get started.

On the community front, the focus is on building up the various channels we operate on, like Facebook and Twitter, etc. The new forum is live: https://forum.qtum.org

We will be reaching out to various Blockchain meetups over the next few months in order to showcase the technology behind Qtum.

There is a lot to do moving forward, especially on the documentation side of things.

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●▬●▬●▬● First UTXO Based PoS Smart Contract and DAPP Platform ●▬●▬●▬●
▃▃▃▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▃▃▃
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April 13, 2017, 08:28:11 AM
 #3399

Why is it so hard to share a tx id or bitcoin/eth address? This is absurd. Why a bunch of signatures and numbers that mean nothing when you could just do the completely trustless thing that everybody else does and share the addresses? This is cryptocurrency for christ sake wtf is the problem?
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April 13, 2017, 02:06:15 PM
 #3400

Why is it so hard to share a tx id or bitcoin/eth address? This is absurd. Why a bunch of signatures and numbers that mean nothing when you could just do the completely trustless thing that everybody else does and share the addresses? This is cryptocurrency for christ sake wtf is the problem?



i think they do not get all the money in one address, the exchange are still hold some btc because the PBOC bank in china.

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