|
Qtum (OP)
|
 |
April 20, 2017, 05:12:10 AM |
|
The UTXO model is suitable for applications where each output is owned by exactly one individual otherwise it will break down. This works for currency models like Bitcoin, are you planning to use a hybrid model for general purpose smart contracts in Qtum?
We are building a layer that allows the Ethereum Virtual Machine to operate within a UTXO blockchain. This requires us to modify some Bitcoin Script opcodes, and make adjustments so the Ethereum Accounts model can communicate with UTXO's.
Here's a quick diagram:There's more information about this on our website: https://qtum.org/en/account-abstraction-layer-overview"Account Abstraction Layer Overview Building on bitcoins reliable and proven-to-deliver blockchain, Qtum stacks its Account Abstraction Layer, allowing the Bitcoin Core 0.13 blockchain to seamlessly interact with the Ethereum Virtual Machine (EVM). With this innovation it is now possible to execute smart contracts and run decentralized applications, simply and securely, in environments that were previously out of reach for Ethereum, combining the endless possibilities provided by smart contracts with the stability and maturity of the bitcoin ecosystem. Until now, attempts to implement smart contract solutions on top of the bitcoin blockchain have had issues, been lackluster, or failed to break into the mainstream business market. This is primarily due to the fact that the bitcoin blockchain employs an Unspent Transaction Output (UTXO) scheme to associate coins with addresses, rather than the easier to understand, but otherwise problematic, account-based model used by Ethereum. An account based model works pretty much the way one would imagine: if Alice has 10 tokens, and sends 5 of them to Bob, who has zero tokens; 5 tokens are simply subtracted from Alice’s balance and added to Bob’s, who now owns 5 coins. On a UTXO blockchain, however, Alice does not directly hold 10 tokens, but a series of outputs, which are collections of coins resulting from previous transactions. In such a model, instead of owning 10 tokens, Alice would, for example, hold 3 outputs: (a) consisting of 6 coins, (b) consisting of 2 coins, and (c) consisting of another 2 coins. In this scenario Alice couldn’t simply send 5 coins to Bob, but instead she (or her wallet, for that matter) would have to pick the best-suited output and receive “change” in return (a process called coin picking). In our example this means that Alice would transfer output (a), consisting of 6 coins, and receive 1 coin back as “change”. This “change” is what is called the Unspent Transaction Output, or UTXO. After the transaction Alice would still hold 3 outputs, this time (a) consisting of 1, while (b) and (c) remain 2. Employing such a seemingly complex bookkeeping scheme allows the Bitcoin blockchain to support Simple Payment Verifications or SPVs. The SPV protocol enables the support of light wallets, which are wallets that can interact with the Bitcoin network in a decentralized and trustless manner, without having to download the entire Bitcoin blockchain. This property is immensely useful for mobile applications or in any low bandwidth/storage environment. Until now, Ethereum smart contracts couldn't execute in such environments exactly because Ethereum’s account based blockchain does not provide a SPV analog. To solve this, Qtum builds its decentralized application platform on the proven-to-deliver Bitcoin blockchain and introduces the Qtum Account Abstract Layer, which serves as a communication layer between the Bitcoin Core 0.13 protocol and the EVM. To achieve this, Qtum has extended the Bitcoin 'Script' language, adding 3 ‘opcodes’ so that it functions as a vehicle to transport code to the EVM, while adding special processing conditions, executing these EVM-using transactions immediately when added to the blockchain - allowing the EVM to operate within a UTXO environment. In order to relieve Qtum smart contracts from the need to perform coin picking for every transaction, Qtum comes coded with an automated, generic coin picking algorithm which allows contracts to ignore the UTXO mode of operation, while functioning normally, as if deployed in an account-based environment. This method is what enables Qtum to be compatible with pre-existing Ethereum smart contracts, allowing them to be executed on Qtum with little to no change to their code. For more information about Qtum’s architecture in general, please read the blog post or review our Technical Whitepaper. " You can also see some press articles where this was briefly discussed: https://www.forbes.com/sites/rogeraitken/2017/02/06/qtum-mixing-bitcoin-ethereum-launching-proof-of-stake-smart-contracts-platform/#7534ad71775b |
|
|
|
|
|
|
|
|
The forum was founded in 2009 by Satoshi and Sirius. It replaced a
SourceForge forum.
|
|
|
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction.
|
|
stormia
|
|
April 20, 2017, 06:52:13 AM |
|
Just curious if the ICO funds have been proven yet? Any tx ids or addresses provided? If not, do you plan on ever providing this information? Thanks.
|
|
|
|
|
|
NorthPixel
|
|
April 20, 2017, 09:41:29 AM |
|
Just curious if the ICO funds have been proven yet? Any tx ids or addresses provided? If not, do you plan on ever providing this information? Thanks.
No, they do not. They want to sell you tokens at an inflated price and disappear with money and forget about the project. |
|
|
|
|
bullytwu
Newbie
 Offline
Activity: 57
Merit: 0
|
|
April 20, 2017, 02:19:14 PM |
|
Where can I get signature, maybe Im blind but cant find it.
yes why not after mining and full effort over it you will be succeeded. |
|
|
|
|
|
Qtum (OP)
|
|
April 20, 2017, 11:35:44 PM |
|
Qtum Roadmap Breakdown:Subsection 1:Potentially incomplete GUI, full RPC methods for contract interaction A potentially incomplete Graphical User Interface (GUI) refers to the ‘frontend’ Qtum wallet. A Daemon is essentially a ‘service’ that runs on a server, it’s usually shortened to “D” meaning that Qtum Server or Quantum “Daemon” would be shortened to simply “QtumD”. The GUI is a wrapper that contains a compiled binary of the Qtum source code. This is usually done using the QT framework, allowing users of various operating systems to complete tasks, such as: transfer tokens, control smart contracts, create new accounts, etc. Some operations will not have graphical functions, these are usually RPC commands that require a console view, and will be operated using command line interfaces, such as viewing the network difficulty. When the Qtum source code is compiled and permissions are assigned, the Daemon process can be started. This allows the entity running this to call on RPC commands, which are defined as “Remote Procedure Calls”. Many people who use Bitcoin wallets may not realize they already use these calls frequently, when they send and receive coins in their QT wallet. The purpose of a GUI wallet is to eliminate having to compile source code and having to learn the various RPC functions. The nature of UTXO blockchains allows Qtum to be very familiar to users who have experience with Bitcoin and other projects that fall into its family, like Litecoin. This section of the Roadmap states that the Qtum testnet will be ready to compile, with full RPC methods for interraction with Smart Contracts that interract with the EVM (Ethereum Virtual Machine). Subsection 2:
Designed for developers, not consumersStability is not the major concern at this point, the point of a Test Network is to find issues and improve the code, thus leading to a stable release. The Qtum developers will give test tokens to any interested party, allowing them to implement their ideas, and have the gas to execute contracts. These test tokens will hold no value and are not the same as the tokens which will be given to participants of the crowdsale. Interested parties that have been planning to develop on the Qtum platform will now be able to learn and test their ideas. Service providers, who have developed their own products, can start to explore if they will have to modify their systems to provide Qtum. For example, if an exchange would like to list Qtum, there are so many factors that come into effect. They need to make sure their accounting systems are compatible with the various RPC calls, and may need time to adjust their platforms.
Subsection 3: Should be stable, but features and RPC layer subject to change from community feedback The Qtum Test Network is a lead up to the Main Network release. It’s designed to attract interested developers. Service providers that plan to adopt Qtum into their business model will be able to analyze the code so they are prepared for the Main Network release in September 2017. The RPC layer mentioned in this section is the same part 1, but this section is about the RPC commands directly related to calling on the Qtum Daemon. Some of the typical BitcoinD calls, like “setgenerate” will obviously be removed, as this allows the user to mine for tokens with their computer, which is not needed for Qtum. The standard RPC commands will be available, but the Qtum developers may choose to add some that BitcoinD does not currently have. This is the best time for third party developers to make suggestions. The Simple Payment Verification protocol was created before the Ethereum Virtual Machine, so it needs to be extended to allow interaction with Smart Contracts, and to allow verification and validation of a contract’s state. In order to release a wallet that does not require the entire blockchain to be downloaded (only the headers) and can control a Smart Contract, the wallet needs to synchronize the Qtum contract state. The SPV protocol does not keep track of Smart Contract State, which is paramount to our goal here. This addition to SPV allows developers to create wallets that can validate both transactions and smart contract state, by only downloading the block headers and the interesting transaction or contract state data. |
|
|
|
|
romanekras
|
|
April 21, 2017, 02:32:08 PM |
|
AI-Powered Smart Contract Interface Built on Qtum Blockchain Agrello, an Estonian blockchain start-up developing smart contract solutions, has announced that it has selected the Qtum blockchain to be its infrastructure for the company’s AI-powered smart contract interface. The company has created an interface using AI, allowing users with no legal or coding skills to create, manage, and automate legally binding smart agreements which are both stored as smart contracts on the blockchain, as well as translated to legally binding documents in natural English. According to Agrello, the solution will allow individuals and businesses to use smart contracts as a substitute and enhancement to standard paper contracts. The decision to base its technology on Qtum was announced yesterday in Shanghai, at an Qtum event. Agrello’s AI smart contract interface corresponds with Qtum’s Smart Contract Lifecycle Management solution, detailed in Qtum’s Whitepaper, which proposes an intuitive workflow to derive smart contract code from human-readable agreements and manage them in real time. More |
|
|
|
|
|
Qtum (OP)
|
|
April 22, 2017, 12:30:02 AM |
|
Agrello, an Estonian blockchain startup developing business-ready smart contract solutions, has announced that it has selected the Qtum blockchain as its infrastructure of choice for the company’s AI powered smart contract interface. The London Summit 2017 is coming, get involved! Agrello develops an intuitive AI powered interface, allowing users with no legal or coding skills to easily create, manage, and automate legally binding smart agreements which are both – stored as smart contracts on the blockchain, as well as translated to legally biding documents in natural English. According to Agrello, their solution will allow individuals and businesses to use smart contracts as a substitute and enhancement to standard paper contracts – a practice until recently regarded as impossible due to the complicated and obfuscated nature of smart contract technology. Hando Rand Explaining the company’s choice, Hando Rand, Agrello Project Lead and co-founder stated: “We’ve been searching for over a year to find a blockchain platform that would fit our needs. Qtum allows us to build a mobile-compatible and scalable smart contract solution, and hence is our technology of choice.” Agrello’s decision to base its technology on Qtum was announced Wednesday in Shanghai, at an Qtum event. The Qtum project has recently raised $15.6 million in one of the industry’s fastest token crowd-sales to date, and seeks to open its platform for public use in Q3 this year. |
|
|
|
Altty
Member
Offline
Activity: 72
Merit: 10
|
|
April 22, 2017, 02:58:32 AM |
|
Agrello, an Estonian blockchain startup developing business-ready smart contract solutions, has announced that it has selected the Qtum blockchain as its infrastructure of choice for the company’s AI powered smart contract interface. The London Summit 2017 is coming, get involved! Agrello develops an intuitive AI powered interface, allowing users with no legal or coding skills to easily create, manage, and automate legally binding smart agreements which are both – stored as smart contracts on the blockchain, as well as translated to legally biding documents in natural English. According to Agrello, their solution will allow individuals and businesses to use smart contracts as a substitute and enhancement to standard paper contracts – a practice until recently regarded as impossible due to the complicated and obfuscated nature of smart contract technology. Hando Rand Explaining the company’s choice, Hando Rand, Agrello Project Lead and co-founder stated: “We’ve been searching for over a year to find a blockchain platform that would fit our needs. Qtum allows us to build a mobile-compatible and scalable smart contract solution, and hence is our technology of choice.” Agrello’s decision to base its technology on Qtum was announced Wednesday in Shanghai, at an Qtum event. The Qtum project has recently raised $15.6 million in one of the industry’s fastest token crowd-sales to date, and seeks to open its platform for public use in Q3 this year. Very cool, this is machine readable contracts on the blockchain? I read somewhere this is like "real" smart contracts that are valid contracts. Great to see this project on Qtum. |
|
|
|
|
|
kliown
|
|
April 22, 2017, 07:01:37 AM |
|
do you have a plan to enter big exchanges this year?
i think we will wait until main net release on sept, we need main net for exchage, except IOU |
|
|
|
|
|
BTCspace
|
|
April 22, 2017, 05:10:38 PM |
|
Agrello, an Estonian blockchain startup developing business-ready smart contract solutions, has announced that it has selected the Qtum blockchain as its infrastructure of choice for the company’s AI powered smart contract interface. The London Summit 2017 is coming, get involved! Agrello develops an intuitive AI powered interface, allowing users with no legal or coding skills to easily create, manage, and automate legally binding smart agreements which are both – stored as smart contracts on the blockchain, as well as translated to legally biding documents in natural English. According to Agrello, their solution will allow individuals and businesses to use smart contracts as a substitute and enhancement to standard paper contracts – a practice until recently regarded as impossible due to the complicated and obfuscated nature of smart contract technology. Hando Rand Explaining the company’s choice, Hando Rand, Agrello Project Lead and co-founder stated: “We’ve been searching for over a year to find a blockchain platform that would fit our needs. Qtum allows us to build a mobile-compatible and scalable smart contract solution, and hence is our technology of choice.” Agrello’s decision to base its technology on Qtum was announced Wednesday in Shanghai, at an Qtum event. The Qtum project has recently raised $15.6 million in one of the industry’s fastest token crowd-sales to date, and seeks to open its platform for public use in Q3 this year. thank you for the updates that's really cool. |
running farm worldwide
|
|
|
|
BTCspace
|
|
April 22, 2017, 05:11:38 PM |
|
people already start trading at bter?
what happened?
|
running farm worldwide
|
|
|
|
cybterpunk
|
|
April 23, 2017, 02:45:04 AM |
|
Development Update:
Over the last few weeks, the Qtum mobile team has been work on the lite wallet Smart Contract functions. Yesterday, we produced some screenshots that showcase what to expect in the months to come.
Here are some details:
1, The mobile wallet is pre-alpha, operating in a very early Test Network
2, The screenshots show that you can create your own tokens as part of a contract, to launch your own project in 3 steps.
3, The SPV integration is not yet complete, it's all going through a centralized server right now. This will be ready after the Main Network is released.
4, We are taking suggestions on which Smart Contract function you would like included in this software.
thank you! the mobile wallet is great! so i can release my token in this wallet？ how much you charge for release one token? thank you! |
|
|
|
|
|
BTCspace
|
|
April 23, 2017, 02:46:57 AM |
|
https://forum.qtum.org/topic/109/qtum-development-updates-april-21st-2017
Qtum Technology Updates (17th April)
Changes made through this week to the core wallet: Bugs fixed: [Consensus/mining] Fixed segwit block construction to properly handle EVM refund transactions in the AAL [Consensus/EVM] Fixed an integer overflow issue where gas values were sometimes seen as negative [RPC/wallet] Fixed createcontract and sendtocontract bug where inputs would sometimes be signed in the wrong order Work completed: [Consensus/chain] Implemented PoS compatible difficulty algorithm which adjusts the difficulty with every block, rather than every two weeks [Misc] Ported Bitpay features to Qtum, however, they will not be imported to the main wallet "master" branch at this point, and will remain in their own branch. [Builds] Updated the code to have no compiler warnings [Tests/regressions] Added several automated regression tests for OP_CALL (previously named OP_EXECASSIGN) [Consensus/PoS] Added several pieces of staking data to the blockheader, which allows for syncing and partially-validating block headers before syncing transaction body data and witness signature data (this results in faster syncing, and more secure block validation when without witness data) Ongoing in-progress work: [Consensus/AAL] Adding the "condensing transaction" design to the AAL which greatly simplifies the accounting process and eliminates several weaknesses in the original design [Consensus/PoS] Adding rules for PoSv3 to fully validate PoS blocks for consensus purposes Design work: [Consensus/EVM] Formalized the format of the version argument for OP_CALL and OP_CREATE to make future soft-forks simple
|
running farm worldwide
|
|
|
chichidori
Legendary
Offline
Activity: 1694
Merit: 1003
|
|
April 23, 2017, 04:03:22 AM |
|
people already start trading at bter?
what happened?
Its an ICO from qtum but still its an over inflated token, TX ID`s should be presented for the future investors. |
|
|
|
|
iwhyer
Newbie
Offline
Activity: 1
Merit: 0
|
|
April 23, 2017, 07:36:33 AM |
|
It worth?
|
|
|
|
|
ladiesBTC
Full Member
Offline
Activity: 126
Merit: 100
🌟🌟
|
|
April 23, 2017, 01:59:36 PM |
|
Does anyone invest in ICO qtum?
If there can show TX id
|
|
|
|
sonicdx10
Newbie
Offline
Activity: 49
Merit: 0
|
|
April 23, 2017, 06:36:01 PM |
|
Does anyone invest in ICO qtum?
If there can show TX id
There's no txid yet, right? |
|
|
|
|
|
Qtum (OP)
|
|
April 24, 2017, 12:00:44 AM |
|
Agrello, a blockchain startup developing artificial-intelligence (AI) powered smart contract solutions, has selected the Qtum blockchain as the infrastructure for its smart contract interface, The announcement was made in Shanghai this week. The Estonia-based company’s purported business case is that its interface allows users with no coding skills to create and manage automated smart contracts that will be stored and secured on the Qtum blockchain while being translated into documents in natural English. According to Agrello, their solution will allow individuals and businesses to use smart contracts as a substitute for and enhancement to standard paper contracts. Speaking with Bitcoin Magazine, Co-founder and CEO of Agrello Hando Rand described his path from doing early research on what had not yet been termed “smart contracts” at Tallum University of Technology. He was “blown away” when Ethereum was first announced as he realized that blockchain technology could be the means for his work to become reality. Rand said of the choice to build on Qtum that his team has been “searching for over a year to find a blockchain platform that would fit our needs. Qtum allows us to build a mobile-compatible and scalable smart contract solution, and hence is our technology of choice.” Qtum Co-Founder and CEO Patrick Das weighed in on the news to Bitcoin Magazine, “Qtum aims to build the first POS smart contract platform that is mobile supported; we welcome more and more startups to build applications on Qtum platform in the future.” The professional legal view of smart contract technology and its potential applications in the field trends positive, and several U.S. states have passed regulations confirming smart contract applications over the last year, while formally defining what they deem smart contracts to be. In 2016 the state of Vermont passed a law providing that a blockchain-based digital record will be considered a business record under the Vermont Rules of Evidence; just this April the state of Arizona passed a law confirming that smart contracts managed on the blockchain are considered electronic records. The Arizona law defines smart contracts as an “event driven program, with state, that runs on a distributed, decentralized, shared and replicated ledger that can take custody over and instruct transfer of assets on that ledger.” Agrello’s AI smart contract interface corresponds with Qtum’s Smart Contract Lifecycle Management solution, detailed in Qtum’s whitepaper, which proposes a workflow to derive smart contract code from human-readable agreements and manage them in real time.The Qtum project, with management support from PWC, raised $15.6 million this March, and plans for its platform to be ready for public use in Q3 of this year. |
|
|
|
|
HopeCrypto
|
|
April 24, 2017, 12:02:45 AM |
|
I think - QTUM is the biggest and great project, may be
|
|
|
|
|
|
BTCspace
|
|
April 24, 2017, 12:04:49 AM |
|
I think - QTUM is the biggest and great project, may be
where your thinking come from? |
running farm worldwide
|
|
|
|
