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Author Topic: [ANN] (QTUM) - A Scalable Smart Contract Platform w/ Proof of Stake  (Read 431918 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.)
Qtum
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June 28, 2017, 11:11:00 PM
 #4241

Qtum Test Network Launch in Shanghai:

The Qtum team hosted a launch event in Shanghai last night to celebrate the Test Network release. So far the network is running well, and tokens are available for anyone interested. The source code is available on our github:

https://github.com/qtumproject/qtum/releases


We will also launch a block explorer and Win64 QT binary within a reasonable time frame.


Please feel free to look over the code, and submit any feedback you may have. If you would like some Test Network tokens, we will create a faucet shortly, but for now you can PM this account on Bitcointalk or ask in our Slack channel.




















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●▬●▬●▬● First UTXO Based PoS Smart Contract and DAPP Platform ●▬●▬●▬●
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moneyalchemist
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June 29, 2017, 01:36:11 PM
 #4242

some one message me about this it a newbie account are you doing a promoting campaign sir?


Same here. Straight to spam after this.
Crypto Girl
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June 29, 2017, 02:46:20 PM
 #4243

The testnet update is a comforting news but still we are waiting for the real one where we can trade or exchange the token into some other currencies or just trade them to bitcoin and converted into a cold cash. Grin


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ethlover1234
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June 29, 2017, 04:52:22 PM
 #4244

The testnet update is a comforting news but still we are waiting for the real one where we can trade or exchange the token into some other currencies or just trade them to bitcoin and converted into a cold cash. Grin

You may already be able to depending on the exchange you bought from
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June 29, 2017, 04:53:07 PM
 #4245

The testnet update is a comforting news but still we are waiting for the real one where we can trade or exchange the token into some other currencies or just trade them to bitcoin and converted into a cold cash. Grin

We have to wait for this moment when it become tradable and we can transfer it from that exchanges. I also believe into this project this team is looking devoted and mainnet will get launched on time as it planned.
BTCspace
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June 29, 2017, 05:15:20 PM
 #4246

the testnet seems going very well!


running farm worldwide
Flomess
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June 29, 2017, 05:17:56 PM
 #4247

I don't know what qtum is but i'm reciving alot of spam via PMs, promoting it. If you need to spam forum members with personal messages to get some activity going i don't know what to say.
Will be avoiding Qtum and telling everyone thats just spam generated hype, cheers.
Qtum
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June 29, 2017, 06:10:25 PM
 #4248

Our PR for the Sparknet release was picked up by few media outlets  Smiley

- http://www.econotimes.com/Qtum-Foundation-launches-Sparknet--first-public-test-of-blockchain-platform-779101

- 
https://www.cryptoninjas.net/2017/06/28/qtum-unveils-worlds-first-proof-stake-smart-contracts-platform

- http://bitsonline.com/qtum-proof-stake-smart-contracts

- http://www.coinspeaker.com/2017/06/28/qtum-unveils-worlds-first-proof-stake-smart-contracts-platform

▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀█ Qtum █▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
●▬●▬●▬● First UTXO Based PoS Smart Contract and DAPP Platform ●▬●▬●▬●
▃▃▃▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▃▃▃
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June 29, 2017, 06:23:31 PM
 #4249

I don't know what qtum is but i'm reciving alot of spam via PMs, promoting it. If you need to spam forum members with personal messages to get some activity going i don't know what to say.
Will be avoiding Qtum and telling everyone thats just spam generated hype, cheers.

This project is getting promote by some spammers I think all active members getting same message on daily basis maybe this is new kind of promotion to keep updated all the forum members what is going on but generally this is just headache.
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June 29, 2017, 06:52:22 PM
 #4250

I don't know what qtum is but i'm reciving alot of spam via PMs, promoting it. If you need to spam forum members with personal messages to get some activity going i don't know what to say.
Will be avoiding Qtum and telling everyone thats just spam generated hype, cheers.

This project is getting promote by some spammers I think all active members getting same message on daily basis maybe this is new kind of promotion to keep updated all the forum members what is going on but generally this is just headache.

some silly people are spamming the inbox...

not from Qtum team, but just some silly bitcointalk people...

running farm worldwide
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June 29, 2017, 06:53:35 PM
 #4251

Qtum Unveils World’s First Proof-of-Stake Smart Contracts Platform

The Qtum Foundation is pleased to announce the launch of Sparknet, the first public test of its innovative blockchain platform, which combines crucial advantages of Bitcoin, Ethereum’s Virtual Machine and proof-of-stake consensus.

The Qtum (pronounced Quantum) blockchain model was inspired by the rivalry between proponent developers of the world’s most active blockchain communities, said Qtum co-founder Patrick Dai.

“We want to illustrate efficient scalability and compatibility between blockchain technologies,” said Dai. Qtum raised $15.6 million in a crowdsale in March.

The Qtum blockchain operates according to the Unspent Transaction Output (UTXO) model, which ensures consistency in transactions and the traceability of tokens. At the same time, a virtual machine for smart contracts is layered on top of Qtum’s blockchain, which presents to developers a best-of-both-worlds architecture for the construction of decentralized mobile applications and other blockchain-based ventures.

Co-founder Jordan Earls, who leads Qtum’s team of almost two-dozen developers, said the testnet would feature an Ethereum Virtual Machine smart contract implementation along with Qtum’s proof-of-stake protocol.

“I’m ready to get this in the hands of the community and see what everyone’s response to it will be, in particular, what features other developers can come up with,” said Earls.

“The Qtum team continues to execute and build what can be one of the most exciting and innovative railroads in the blockchain ecosystem,” said Matthew Roszak, Qtum Angel investor and co-founder of Bloq.

Six decentralized applications are already being built for the blockchain, Dai said. Among the applications are a peer-to-peer mobile streaming platform and a prediction market.

While these applications are geared to the Chinese market, the Qtum blockchain will appeal to a global audience, accessible to all developers.

“Like many others around the world, I’m eagerly awaiting the launch,” said Roger Ver, a Qtum Angel investor who has been investing in bitcoin startups since the beginning.

To get developers familiar with Qtum, the Foundation is sponsoring a hackathon in Moscow on July 1-2. For more information, visit blockchainhack.ru.

Visit Qtum’s Github page to view the project’s code repository, which will be accessible to the public on the day of the testnet launch.

running farm worldwide
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June 29, 2017, 08:29:03 PM
 #4252

Qtum Unveils World’s First Proof-of-Stake Smart Contracts Platform

The Qtum Foundation is pleased to announce the launch of Sparknet, the first public test of its innovative blockchain platform, which combines crucial advantages of Bitcoin, Ethereum’s Virtual Machine and proof-of-stake consensus.

The Qtum (pronounced Quantum) blockchain model was inspired by the rivalry between proponent developers of the world’s most active blockchain communities, said Qtum co-founder Patrick Dai.

“We want to illustrate efficient scalability and compatibility between blockchain technologies,” said Dai. Qtum raised $15.6 million in a crowdsale in March.

The Qtum blockchain operates according to the Unspent Transaction Output (UTXO) model, which ensures consistency in transactions and the traceability of tokens. At the same time, a virtual machine for smart contracts is layered on top of Qtum’s blockchain, which presents to developers a best-of-both-worlds architecture for the construction of decentralized mobile applications and other blockchain-based ventures.

Co-founder Jordan Earls, who leads Qtum’s team of almost two-dozen developers, said the testnet would feature an Ethereum Virtual Machine smart contract implementation along with Qtum’s proof-of-stake protocol.

“I’m ready to get this in the hands of the community and see what everyone’s response to it will be, in particular, what features other developers can come up with,” said Earls.

“The Qtum team continues to execute and build what can be one of the most exciting and innovative railroads in the blockchain ecosystem,” said Matthew Roszak, Qtum Angel investor and co-founder of Bloq.

Six decentralized applications are already being built for the blockchain, Dai said. Among the applications are a peer-to-peer mobile streaming platform and a prediction market.

While these applications are geared to the Chinese market, the Qtum blockchain will appeal to a global audience, accessible to all developers.

“Like many others around the world, I’m eagerly awaiting the launch,” said Roger Ver, a Qtum Angel investor who has been investing in bitcoin startups since the beginning.

To get developers familiar with Qtum, the Foundation is sponsoring a hackathon in Moscow on July 1-2. For more information, visit blockchainhack.ru.

Visit Qtum’s Github page to view the project’s code repository, which will be accessible to the public on the day of the testnet launch.

BTCspace sure the hell seems to be on top of the latest news pertaining to Qtum, that and continues to play a role in burying my posts. Let's see why, mmmkay?

First, a post I penned a while back:


"Bring out your TileCoin! Bring out your TileCoin! Invest them in Qtum!"

https://blockchain.info/tx/d0105d8d891a5057c905c81b23d4f513856190a6dc6e875104e19ee1da0b3a39

VVV

https://blockchain.info/address/1NDn3TvJVzpB9fJKDz2ptoc4EiAAUcoMU1



Ref.: Nostalgia's post has since been deleted:

March 16-17th, 2015 - Development Updates

We will keep you posted on the Counterparty downtime once again.

1.) This is a community question.
1.1) Would you like for us to convert existing TilecoinX to our platform?
1.2) How many other Counterparty assets/tokens does everyone have?

2.) We will be traveling to San Francisco for meetings in the next few weeks. We can only publish joint press releases once the paperwork and details are signed. VERY VERY VERY excited!

3.) Backup any TILECOINX via https://counterwallet.io if you do not feel comfortable having TileCoinX in your local wallet until we release the next version with the private key backup view.

4.) How to use Private Key to import BTC funds from external address to Counterwallet address?
https://counterparty.freshdesk.com/support/solutions/articles/5000120686-how-to-use-private-key-to-import-btc-funds-from-external-address-to-counterwallet-address-

5.) Cold storage of Counterparty assets (& BTC) using Armory & Counterwallet
https://counterparty.freshdesk.com/support/solutions/articles/5000004858-cold-storage-of-counterparty-assets-btc-using-armory-counterwallet

Regards,
ASIC-8Tile

Bter.com still holds a large majority of the TILECOINX (a large % belonging to 'angel investors'): https://www.blockscan.com/address/14e3NAm3oNE2Xqvu9SzndsxvVRj9vbwZ9C. This leaves us with about 20 million XTC in circulation: https://www.blockscan.com/address/16iWzf8NydPZBH7QmPWdF4o5uhQ4ow9RY4. I assume not many people holding a lot of XTC if we look at current distribution (not including Bter.com): https://www.blockscan.com/assetholders?q=TILECOINX (nothing to fear).

Enjoy the San Francisco trip, expecting BIG BIG BIG things here for Tilepay in the next few weeks. Smiley

Take it easy.

Will keep support tilecoin for 10 years. Smiley


What are the fuckin odds of BTCspace being directly connected to Tilecoin?

Well, one of BTCspace's early tread was ...

https://bitcointalk.org/index.php?topic=833300.msg9310408#msg9310408


That thread was created on October 23, 2014, 08:31:30 PM and originally titled "IBM’s Adapt project|BlockNET project|Tilecoin| NEXT BIG COIN???"

Suffice to say that BTCspace was versed at that point about Tilecoin.

But on January 03, 2015, 09:39:58 PM in a thread entitled "[ANN] [XTC] TileCoin| IoT (Internet of Things) bitcoin blockchain - ĐApp", BTCspace penned the following:

https://bitcointalk.org/index.php?topic=761852.msg10030562#msg10030562


Yep, you read correctly: BTCspace just stumbled upon Tilecoin for the very first, wishing that he would've found it earlier, but not to be deterred, he purchased some precious XTC.

The only problem is BTCspace already knew about Tilecoin ~10 weeks earlier as demonstrated with my proof above.

Further ...

can these asians stop posting completely irrelevant news articles? tilecoin is not included in any of them.

It's best time to buy some token...

A lot potential of Tilecoin..

maybe next top5 coin..you will realize this in few months.


Remember This is a Tilecoin thread.

if you want to talk about exchange or other coins.

Please move to other thread.


So, on January 3, 2015, BTCspace stumbles upon Tilecoin for the very SECOND time, jacking off all over himself about Tilecoin (see his post history), then on January 4, 2015, BTCspace positions himself to be the thread's policeman. My guess is that BTCspace has been active in the Tilecoin thread since the get-go under a different nym.

One more thing - look at BTCspace's first posts which he has since deleted: https://web.archive.org/web/20140617191607/https://bitcointalk.org/index.php?action=profile;u=336915;sa=showPosts

Not too bad research from an old man living in a van with four flat tires down by the Colorado River, eh?
ethlover1234
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June 30, 2017, 01:23:51 AM
 #4253

Qtum Unveils World’s First Proof-of-Stake Smart Contracts Platform

The Qtum Foundation is pleased to announce the launch of Sparknet, the first public test of its innovative blockchain platform, which combines crucial advantages of Bitcoin, Ethereum’s Virtual Machine and proof-of-stake consensus.

The Qtum (pronounced Quantum) blockchain model was inspired by the rivalry between proponent developers of the world’s most active [Suspicious link removed]munities, said Qtum co-founder Patrick Dai.

“We want to illustrate efficient scalability and compatibility between blockchain technologies,” said Dai. Qtum raised $15.6 million in a crowdsale in March.

The Qtum blockchain operates according to the Unspent Transaction Output (UTXO) model, which ensures consistency in transactions and the traceability of tokens. At the same time, a virtual machine for smart contracts is layered on top of Qtum’s blockchain, which presents to developers a best-of-both-worlds architecture for the construction of decentralized mobile applications and other blockchain-based ventures.

Co-founder Jordan Earls, who leads Qtum’s team of almost two-dozen developers, said the testnet would feature an Ethereum Virtual Machine smart contract implementation along with Qtum’s proof-of-stake protocol.

“I’m ready to get this in the hands of the community and see what everyone’s response to it will be, in particular, what features other developers can come up with,” said Earls.

“The Qtum team continues to execute and build what can be one of the most exciting and innovative railroads in the blockchain ecosystem,” said Matthew Roszak, Qtum Angel investor and co-founder of Bloq.

Six decentralized applications are already being built for the blockchain, Dai said. Among the applications are a peer-to-peer mobile streaming platform and a prediction market.

While these applications are geared to the Chinese market, the Qtum blockchain will appeal to a global audience, accessible to all developers.

“Like many others around the world, I’m eagerly awaiting the launch,” said Roger Ver, a Qtum Angel investor who has been investing in bitcoin startups since the beginning.

To get developers familiar with Qtum, the Foundation is sponsoring a hackathon in Moscow on July 1-2. For more information, visit blockchainhack.ru.

Visit Qtum’s Github page to view the project’s code repository, which will be accessible to the public on the day of the testnet launch.

BTCspace sure the hell seems to be on top of the latest news pertaining to Qtum, that and continues to play a role in burying my posts. Let's see why, mmmkay?

First, a post I penned a while back:

http://i.imgur.com/svn00Rx.jpg
"Bring out your TileCoin! Bring out your TileCoin! Invest them in Qtum!"

https://blockchain.info/tx/d0105d8d891a5057c905c81b23d4f513856190a6dc6e875104e19ee1da0b3a39

VVV

https://blockchain.info/address/1NDn3TvJVzpB9fJKDz2ptoc4EiAAUcoMU1

http://i.imgur.com/xt6Oot6.png

Ref.: Nostalgia's post has since been deleted:

March 16-17th, 2015 - Development Updates

We will keep you posted on the Counterparty downtime once again.

1.) This is a community question.
1.1) Would you like for us to convert existing TilecoinX to our platform?
1.2) How many other Counterparty assets/tokens does everyone have?

2.) We will be traveling to San Francisco for meetings in the next few weeks. We can only publish joint press releases once the paperwork and details are signed. VERY VERY VERY excited!

3.) Backup any TILECOINX via https://counterwallet.io if you do not feel comfortable having TileCoinX in your local wallet until we release the next version with the private key backup view.

4.) How to use Private Key to import BTC funds from external address to Counterwallet address?
https://counterparty.freshdesk.com/support/solutions/articles/5000120686-how-to-use-private-key-to-import-btc-funds-from-external-address-to-counterwallet-address-

5.) Cold storage of Counterparty assets (& BTC) using Armory & Counterwallet
https://counterparty.freshdesk.com/support/solutions/articles/5000004858-cold-storage-of-counterparty-assets-btc-using-armory-counterwallet

Regards,
ASIC-8Tile

Bter.com still holds a large majority of the TILECOINX (a large % belonging to 'angel investors'): https://www.blockscan.com/address/14e3NAm3oNE2Xqvu9SzndsxvVRj9vbwZ9C. This leaves us with about 20 million XTC in circulation: https://www.blockscan.com/address/16iWzf8NydPZBH7QmPWdF4o5uhQ4ow9RY4. I assume not many people holding a lot of XTC if we look at current distribution (not including Bter.com): https://www.blockscan.com/assetholders?q=TILECOINX (nothing to fear).

Enjoy the San Francisco trip, expecting BIG BIG BIG things here for Tilepay in the next few weeks. Smiley

Take it easy.

Will keep support tilecoin for 10 years. Smiley


What are the fuckin odds of BTCspace being directly connected to Tilecoin?

Well, one of BTCspace's early tread was ...

https://bitcointalk.org/index.php?topic=833300.msg9310408#msg9310408


That thread was created on October 23, 2014, 08:31:30 PM and originally titled "IBM’s Adapt project|BlockNET project|Tilecoin| NEXT BIG COIN???"

Suffice to say that BTCspace was versed at that point about Tilecoin.

But on January 03, 2015, 09:39:58 PM in a thread entitled "[ANN] [XTC] TileCoin| IoT (Internet of Things) bitcoin blockchain - ĐApp", BTCspace penned the following:

https://bitcointalk.org/index.php?topic=761852.msg10030562#msg10030562


Yep, you read correctly: BTCspace just stumbled upon Tilecoin for the very first, wishing that he would've found it earlier, but not to be deterred, he purchased some precious XTC.

The only problem is BTCspace already knew about Tilecoin ~10 weeks earlier as demonstrated with my proof above.

Further ...

can these asians stop posting completely irrelevant news articles? tilecoin is not included in any of them.

It's best time to buy some token...

A lot potential of Tilecoin..

maybe next top5 coin..you will realize this in few months.


Remember This is a Tilecoin thread.

if you want to talk about exchange or other coins.

Please move to other thread.


So, on January 3, 2015, BTCspace stumbles upon Tilecoin for the very SECOND time, jacking off all over himself about Tilecoin (see his post history), then on January 4, 2015, BTCspace positions himself to be the thread's policeman. My guess is that BTCspace has been active in the Tilecoin thread since the get-go under a different nym.

One more thing - look at BTCspace's first posts which he has since deleted: https://web.archive.org/web/20140617191607/https://bitcointalk.org/index.php?action=profile;u=336915;sa=showPosts

Not too bad research from an old man living in a van with four flat tires down by the Colorado River, eh?

I'm impressed, and admittedly wrong about writing you off as a troll.

https://www.youtube.com/watch?v=3nhgfjrKi0o

Not too bad given the circumstances  Grin
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June 30, 2017, 07:06:24 AM
 #4254

Qtum Unveils World’s First Proof-of-Stake Smart Contracts Platform

The Qtum Foundation is pleased to announce the launch of Sparknet, the first public test of its innovative blockchain platform, which combines crucial advantages of Bitcoin, Ethereum’s Virtual Machine and proof-of-stake consensus.

The Qtum (pronounced Quantum) blockchain model was inspired by the rivalry between proponent developers of the world’s most active blockchain communities, said Qtum co-founder Patrick Dai.

“We want to illustrate efficient scalability and compatibility between blockchain technologies,” said Dai. Qtum raised $15.6 million in a crowdsale in March.

The Qtum blockchain operates according to the Unspent Transaction Output (UTXO) model, which ensures consistency in transactions and the traceability of tokens. At the same time, a virtual machine for smart contracts is layered on top of Qtum’s blockchain, which presents to developers a best-of-both-worlds architecture for the construction of decentralized mobile applications and other blockchain-based ventures.

Co-founder Jordan Earls, who leads Qtum’s team of almost two-dozen developers, said the testnet would feature an Ethereum Virtual Machine smart contract implementation along with Qtum’s proof-of-stake protocol.

“I’m ready to get this in the hands of the community and see what everyone’s response to it will be, in particular, what features other developers can come up with,” said Earls.

“The Qtum team continues to execute and build what can be one of the most exciting and innovative railroads in the blockchain ecosystem,” said Matthew Roszak, Qtum Angel investor and co-founder of Bloq.

Six decentralized applications are already being built for the blockchain, Dai said. Among the applications are a peer-to-peer mobile streaming platform and a prediction market.

While these applications are geared to the Chinese market, the Qtum blockchain will appeal to a global audience, accessible to all developers.

“Like many others around the world, I’m eagerly awaiting the launch,” said Roger Ver, a Qtum Angel investor who has been investing in bitcoin startups since the beginning.

To get developers familiar with Qtum, the Foundation is sponsoring a hackathon in Moscow on July 1-2. For more information, visit blockchainhack.ru.

Visit Qtum’s Github page to view the project’s code repository, which will be accessible to the public on the day of the testnet launch.

BTCspace sure the hell seems to be on top of the latest news pertaining to Qtum, that and continues to play a role in burying my posts. Let's see why, mmmkay?

First, a post I penned a while back:



thank you gleb for troll Qtum

we like you.


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June 30, 2017, 07:08:31 AM
Last edit: July 12, 2017, 01:47:53 PM by Monkey1
 #4255

Good news is coming. It's a great project . Hopefully more good news comes . If you support the Chinese, are available in the project to evolve too.

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June 30, 2017, 07:10:17 AM
 #4256

get some free testnet coins now!

qtum.me






get some free testnet coins now!

qtum.me

running farm worldwide
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June 30, 2017, 07:14:17 AM
 #4257

The Qtum Test Network Has Been Released:









Instructions on how to compile from source are listed in the Git. Please see the documentation provided:

Code:

Quickstart

Build on Ubuntu

This is a quick start script for compiling Qtum on  Ubuntu


sudo apt-get install build-essential libtool autotools-dev automake pkg-config libssl-dev libevent-dev bsdmainutils git cmake libboost-all-dev
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:bitcoin/bitcoin
sudo apt-get update
sudo apt-get install libdb4.8-dev libdb4.8++-dev

# If you want to build the Qt GUI:
sudo apt-get install libqt5gui5 libqt5core5a libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev protobuf-compiler

git clone https://github.com/qtumproject/qtum
cd qtum
# Update cpp-ethereum submodule
git submodule update --init --recursive

# Note autogen will prompt to install some more dependencies if needed
./autogen.sh
./configure
make -j2







Qtum Sparknet Usage and Information


Please see: https://github.com/qtumproject/qtum/blob/testnet-1/doc/sparknet-guide.md



Qtum is a decentralized blockchain project built on Bitcoin's UTXO model, but with support for Ethereum Virtual Machine based smart contracts. It achieves this through the revolutionary Account Abstraction Layer. For more general information about Qtum as well as links to join our community, go to https://qtum.org



Welcome to Qtum Sparknet, the first public testnet for the Qtum blockchain. Sparknet is designed primarily for developers, and as such documentation at this point will be technical and suited more for developers. The mainnet is expected to be released in September and will be suited for the general public. Testnet tokens do not hold any value and should not be traded for any monetary instruments. The testnet can be reset or forked at anytime as deemed necessary for development. Sparknet does not include support for Mutualized Proof Of Stake, or for the Decentralized Governance Protocol. Both of these features are implemented, and their code is available on alternative branches (check the pull requests), but have not been tested and proven stable enough to include in this testnet. They will be implemented in the 2nd public testnet for Qtum.




Using Smart Contracts with Qtum





The smart contract interface in Qtum still requires some technical knowledge. The GUI is not completed yet, so all smart contract interation must happen either using qtum-cli at the command line, or in the debug window of qtum-qt.

To demonstrate how to deploy and interact with a simple we will use this contract:


Code:
pragma solidity ^0.4.0;

contract QtumTest {
   uint storedNumber;
   function QtumTest() {
       storedNumber=1;
   }
   function setNumber(uint number) public{
       storedNumber = number;
   }
   function logNumber() constant public{
        log1("storedNumber", uintToBytes(storedNumber));
   }
   function returnNumber() constant public returns (uint){
       return storedNumber;
   }
   function deposit() public payable{
   }
   function withdraw() public{
       if(!msg.sender.send(this.balance)){
           throw;
       }
   }
   //utility function
   function uintToBytes(uint v) constant returns (bytes32 ret) {
       if (v == 0) {
           ret = '0';
       }
       else {
           while (v > 0) {
               ret = bytes32(uint(ret) / (2 ** 8));
               ret |= bytes32(((v % 10) + 48) * 2 ** (8 * 31));
               v /= 10;
           }
       }
       return ret;
   }
}



It compiles to the following EVM bytecode



Code:
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
And finally, has the following JSON interface file:

[{"constant":true,"inputs":[],"name":"returnNumber","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"withdraw","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"number","type":"uint256"}],"name":"setNumber","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"v","type":"uint256"}],"name":"uintToBytes","outputs":[{"name":"ret","type":"bytes32"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"logNumber","outputs":[],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"deposit","outputs":[],"payable":true,"type":"function"},{"inputs":[],"payable":false,"type":"constructor"}]





This info can easily be retrieved for any contract by using Browser Solidity, inputing your contract's source code, and then on the right hand side clicking "contract details"[/size]


(note, if using the debug window in the Qtum Qt application, don't include ./qtum-cli in the commands)

First, we need to deploy the contract:



Code:
./qtum-cli createcontract 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 300000
Note that the last number is the gas limit for this transaction. The default value is not large enough for this contract, so we increase it to 300,000 gas.

This should result in something like so:

{
  "txid": "72b0e0576d289c1e4e6c777431e4845f77d0884d3b3cff0387a5f4a1a3a874ea",
  "sender": "qZbjaE8N18ZU1m7851G7QGhvxKL74SRBTt",
  "hash160": "aff3e34ab836edb8d214a993d9da105915e4a6e9",
  "address": "5bde092dbecb84ea1a229b4c5b25dfc9cdc674d9"
}



Now, you should store the address in a variable so it's easy to track:

export CONTRACT=5bde092dbecb84ea1a229b4c5b25dfc9cdc674d9
Now wait for your contract to be included in a block. You should be able to confirm it made it into a block by using:

./qtum-cli getaccountinfo $CONTRACT
If you get a message saying "Address does not exist", then either your transaction has not yet been included in a block (you can confirm this with getrawtransaction and your txid), or you did not provide enough gas for the contract to be executed and persisted into the blockchain. If the contract was successfully executed and persisted in the blockchain, you should see something like this:


Code:

{
  "address": "5bde092dbecb84ea1a229b4c5b25dfc9cdc674d9",
  "balance": 0,
  "storage": {
    "290decd9548b62a8d60345a988386fc84ba6bc95484008f6362f93160ef3e563": {
      "0000000000000000000000000000000000000000000000000000000000000000": "0000000000000000000000000000000000000000000000000000000000000001"
    }
  },
  "code": "..."
}



In order to interact with the contract, you must create raw ABI data from the interface JSON file. The easiest tool to assist in this is ethabi, https://github.com/paritytech/ethabi

Make sure the JSON file is saved somewhere, we will call it interface.json.

In order to get the storedNumber variable we use the returnNumber() function. We can construct the ABI values by using ethabi:

ethabi encode function ~/interface.json returnNumber
The result of this is:

3450bd6a

Now, because we are not changing state, we use callcontract:

./qtum-cli callcontract $CONTRACT 3450bd6a
This results in a lot of data that can be useful in different contexts (including gas estimates), but we are only concerned about the output field, which is the value of storedNumber


Code:
{
  "address": "5bde092dbecb84ea1a229b4c5b25dfc9cdc674d9",
  "executionResult": {
    "gasUsed": 21664,
    "excepted": "None",
    "newAddress": "5bde092dbecb84ea1a229b4c5b25dfc9cdc674d9",
    "output": "0000000000000000000000000000000000000000000000000000000000000001",
    "codeDeposit": 0,
    "gasRefunded": 0,
    "depositSize": 0,
    "gasForDeposit": 0
  },
  "transactionReceipt": {
    "stateRoot": "ffbeb0377d43c6ed443a2840259ff5ead5158016ab54d55ef21b7b11aa71947f",
    "gasUsed": 21664,
    "bloom": "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "log": [
    ]
  }
}



To change the storedNumber we can do an on-chain execution using sendtocontract. First, we need the ABI data:

ethabi encode function ~/interface.json setNumber -p 123456 --lenient
3fb5c1cb000000000000000000000000000000000000000000000000000000000001e240
Note we use --lenient so that we do not need to provide a full 256bit value as a parameter. Now, we can execute the contract directly:

./qtum-cli sendtocontract $CONTRACT 3fb5c1cb000000000000000000000000000000000000000000000000000000000001e240
Afterwards, we can call returnNumber() again and check the output field:

"output": "000000000000000000000000000000000000000000000000000000000001e240",
This is 123456 encoded as hex.

You can also use the logNumber() function in order to generate logs. If your node was started with -record-log-opcodes, then the file vmExecLogs.json will contain any log operations that occur on the blockchain. This is what is used for events on the Ethereum blockchain, and eventually it is our intention to bring similar functionality to Qtum.

You can also deposit and withdraw coins from this test contract using the deposit() and withdraw() functions.

The ABI value for deposit is d0e30db0 and the ABI value for withdraw is 3ccfd60b

This will send 10 tokens to the contract:

./qtum-cli sendtocontract $CONTRACT d0e30db0 10

And then, to withdraw them it's also very simple:

./qtum-cli sendtocontract $CONTRACT 3ccfd60b

If you want to control the exact address that the contract sends coins to, you can also explicitly specify the sender. Note that you must be capable of sending coins from that address (you can't use someone elses address). One of my wallet addresses is qZbjaE8N18ZU1m7851G7QGhvxKL74SRBTt, so I'll use that:

./qtum-cli sendtocontract $CONTRACT 3ccfd60b 0 190000 0.0000001 qZbjaE8N18ZU1m7851G7QGhvxKL74SRBTt

Note that if you get the error "Sender address does not have any unspent outputs", then you should send some coins to that address (they must be spent in order to prove that you own that address). This can be accomplished with any amount of coins:

./qtum-cli sendtoaddress qZbjaE8N18ZU1m7851G7QGhvxKL74SRBTt 0.001

There is no need to wait for this transaction to confirm, it can be followed immediately by the sendtocontract command:

./qtum-cli sendtocontract $CONTRACT 3ccfd60b 0 190000 0.0000001 qZbjaE8N18ZU1m7851G7QGhvxKL74SRBTt

When creating this contract transaction, nothing will immediately happen, when the transaction is put into a block though a new transaction will appear in a block which will send any coins owned by the contract to the pubkeyhash address qZbjaE8N18ZU1m7851G7QGhvxKL74SRBTt

FAQ

Q: "I used createcontract, but can't call my contract and it's not in listcontract" A: You probably did not provide enough gas for the contract's constructor to be executed and it's code persisted in the blockchain. The vm.log file should confirm this by saying how much gas was needed

Q: "I sent a large amount of gas but I never got a refund" A: Refunds are generated from the coinstake transaction, so you must wait 500 blocks for the gas refund to mature before it can be spent again

Q: "I used -reindex and now my node is taking forever to resync" A: Currently when doing a reindex, all contracts are reprocessed, so in a chain with many contract executions this can add up to a significant amount of time. This will be made faster in the future, as well as the initial syncing speed of nodes

Q: "I think I found a bug in Qtum" A: Please report any bugs at https://github.com/qtumproject/qtum/issues
New Qtum RPC Commands

Qtum supports all of the RPC commands supported by Bitcoin Core, but also includes the following commands unique to Qtum:

createcontract - This will create and deploy a new smart contract to the Qtum blockchain. This requires gas.
callcontract - This will interact with an already deployed smart contract on the Qtum blockchain, with all computation taking place off-chain and no persistence to the blockchain. This does not require gas
sendtocontract - This will interact with an already deployed smart contract on the Qtum blockchain. All computation takes place on-chain and any state changes will be persisted to the blockchain. This allows tokens to be sent to a smart contract. This requires gas.
getaccountinfo - This will show some low level information about a contract, including the contract's bytecode, stored data, and balance on the blockchain.
listcontracts - This will output a list of currently deployed contract addresses with their respective balance. This RPC call may change or be removed in the future.
reservebalance - This will reserve a set amount of coins so that they do not participate in staking. If you reserve as many or more coins than are in your wallet, then you will not participate at all in staking and block creation for the network.
getstakinginfo - This will show some info about the current node's staking status, including network difficulty and expected time (in seconds) until staking a new block.
New Qtum Command Line Arguments

Qtum supports all of the usual command line arguments that Bitcoin Core supports. In addition it adds the following new command line arguments:

-record-log-opcodes - This will create a new log file in the Qtum data directory (usually ~/.qtum) named vmExecLogs.json, where any EVM LOG opcode is logged along with topics and data that the contract requested be logged.
Untested features

Some features included in Bitcoin Core have not been tested in it's porting to Qtum. This includes:

Pruning

EVM Smart Contract Changes and Limitations

Because of Qtum's underlying technical differences, there are a few operations that can have different results or limitations when executed in Qtum than when compared to Ethereum.

These include the following, though there may be others introduced in the future:

The gas schedule for Qtum is different from Ethereum. Certain operations are more or less expensive. As such, gas cost estimators designed for Ethereum will not give accurate results for Qtum. We will develop our own gas estimating tools as well as fully documenting these differences at a later date.

block.coinbase or the COINBASE opcode currently is not supported and will only return 0. When MPoS is released in the 2nd testnet this should be functioning as expected
block.number will return the previous block height before this block containing the contract's execution
block.difficulty will return the previous block's difficulty
`block.timestamp will return the previous block's timestamp
block.blockhash(n) will return 0 when n is the current block height (block.number+1), similar to Ethereum
sender will return 0 when the coins spent (vin[0].prevout) are from a non-standard transaction. It will return the pubkeyhash 160bit address when spent from a pubkey or pubkeyhash transaction
Coins can be sent to either contracts or pubkeyhash addresses. When coins are sent to a non-existent contract address, the coins will automatically be sent to a pubkeyhash address instead.
Only 1000 vouts can be generated from a single contract execution. Sending coins to the same contract multiple times results in a single vout being created, so the limitation is effectively that coins can only be sent to up to 1000 unique contract or pubkeyhash addresses, including balance changes between contracts. If this limit is exceeded, an Out Of Gas exception is generated and all state changes are reverted.
Contract executions can not happen within coinbase or coinstake transactions
Additional documents for the overall design and expected results of various operations is available at the ITD repository here: https://github.com/qtumproject/qtum-itds







If you would like to receive Test Network tokens, please PM this account with your address and we will get them sent ASAP.  These test tokens will have no value, so you are free to share them with others for testing. We will have a faucet set up shortly, along with a Win64 QT shortly

Staff members in our Slack channel will have Qtum Test Tokens to distribute. Remember, these are free and have no value.



Right now the team is preparing for our launch event in Shanghai, so it may be a touch busy on our side for the next day.








thanks for the great updates!

looking forward to the mainnet release.

Qtum is more popular than Ethereum in China.

and Qtum have more community member than Ethereum in China... Cheesy
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June 30, 2017, 07:15:52 AM
 #4258






Daily Test Network Update #3:

Leading up to our June 28th Test Network release, we will be providing daily updates that explain the work that goes on behind the scenes. Yesterday we went over the 5 more points, and today we focus a lot on the Proof-of-Stake portion of the Test Network.






11, Change all output strings Bitcoin -> Qtum, BTC -> QTUM




Replace all instances of bitcoin and BTC with qtum and QTUM (Just the output strings, not the actual class/variable names and not the code comments)




12, Increase Script limits to suitable values


There are a number of limits in vanilla Bitcoin that restrict our usage of smart contracts. These limits should be relaxed:

maximum data push size: 1Mb

maximum stack size: 1Mb

Test for other limits that we run into with large scripts caused by contracts.




13, Consensus/Chain parameters for PoS


Consensus/chain parameters for PoS

The consensus provide parameters that will affect the creation of new blocks in the network.

The PoS limit need to be added in order to determine the initial difficulty for PoS.

The halving interval is 4 years (target) and there will be 7 halving intervals.

Block target is set to 128 seconds.

4 tokens per Block (Approximately 1% inflation per year for 4 years)
2 tokens (Slightly more than .5% inflation per year for 4 years based on 100 million original tokens .5% of 104~ million after 4 years)
1 token
.5 tokens
.25 tokens
.125 tokens
.0625 tokens

The last PoW block need to be defined and set to 5000 for the main net. The reward for PoW block is 20000 coins, the reward for PoS block is 4 coins. The Proof-of-Work blocks will be mined by the Qtum development team.




14 , Update of block/block-header parameters for PoS


The general rule for the header is to keep it as small as possible.

Four parameters are needed for PoS in order to work:

1) Block signature, that is the signature of the whole block, signed by the block creator

2) Block type (Proof Of Work or Proof Of Stake)

3) Previous stake location, need in order to confirm the block validity, mandatory for PoS

4) Staking time, the time when the staking transaction was created, mandatory for PoS


Block signature must be a parameter. The parameter need to be in the header due to the segregated witness which split the block delivery into header and transactions that can be required from any user.
The other parameters can be extracted from the PoS transaction. Whether or not to include those 3 parameters in the header too can be discussed. The block header is downloaded before the whole block, not including those parameters in the header will prevent doing PoS checks to the header before downloading the whole block. Blackcoin download the whole block before the checks and put those parameters into the Block.


15 ,Proof of Work/Stake Kernel Update



The source code for PoW and PoS kernel is kept into the files:

pos.h
pos.cpp
pow.h
pow.cpp

The location of the files is according to master-pos, in Blackcoin the location is kernel.h and kernel.cpp.

We need to decide if we will keep it or use different structure for organization of the code for PoW and PoS kernel.
The version of the stake modifier that will be used is the second version.
Block difficulty, masks, modifiers, time-stamps are all used here, so this is important parts for PoS.








Please see the Roadmap below for more information:










Please remember that we have an event in Shanghai on the 28th so please RSVP if you plan on attending:











Qtum will also be sponsoring a Hackathon in Russia, with 8500 QTUM tokens. For more information, please see:










Qtum is hiring! If you have experience in Blockchain technology, and can handle working in a changing industry, get in touch with us.









how many people will go to the hackathon?

cybterpunk
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June 30, 2017, 07:16:40 AM
 #4259

when will we have a Windows wallet?

and a mac wallet ?

thank you
kanayaTabitha
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June 30, 2017, 07:16:58 AM
 #4260

Why some accounts give me a message about Qtum
But I myself did not participate in ICO qtum??

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