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MAME 0.221

MAME 0.221

Our fourth release of the year, MAME 0.221, is now ready. There are lots of interesting changes this time. We’ll start with some of the additions. There’s another load of TV games from JAKKS Pacific, Senario, Tech2Go and others. We’ve added another Panorama Screen Game & Watch title: this one features the lovable comic strip canine Snoopy. On the arcade side, we’ve got Great Bishi Bashi Champ and Anime Champ (both from Konami), Goori Goori (Unico), the prototype Galun.Pa! (Capcom CPS), a censored German version of Gun.Smoke, a Japanese location test version of DoDonPachi Dai-Ou-Jou, and more bootlegs of Cadillacs and Dinosaurs, Final Fight, Galaxian, Pang! 3 and Warriors of Fate.
In computer emulation, we’re proud to present another working UNIX workstation: the MIPS R3000 version of Sony’s NEWS family. NEWS was never widespread outside Japan, so it’s very exciting to see this running. F.Ulivi has added support for the Swedish/Finnish and German versions of the HP 86B, and added two service ROMs to the software list. ICEknight contributed a cassette software list for the Timex NTSC variants of the Sinclair home computers. There are some nice emulation improvements for the Luxor ABC family of computers, with the ABC 802 now considered working.
Other additions include discrete audio emulation for Midway’s Gun Fight, voice output for Filetto, support for configurable Toshiba Pasopia PAC2 slot devices, more vgmplay features, and lots more Capcom CPS mappers implemented according to equations from dumped PALs. This release also cleans up and simplifies ROM loading. For the most part things should work as well as or better than they did before, but MAME will no longer find loose CHD files in top-level media directories. This is intentional – it’s unwieldy with the number of supported systems.
As usual, you can get the source and 64-bit Windows binary packages from the download page. This will be the last month where we use this format for the release notes – with the increase in monthly development activity, it’s becoming impractical to keep up.

MAME Testers Bugs Fixed

New working machines

New working clones

Machines promoted to working

Clones promoted to working

New machines marked as NOT_WORKING

New clones marked as NOT_WORKING

New working software list additions

Software list items promoted to working

New NOT_WORKING software list additions

Source Changes

submitted by cuavas to emulation [link] [comments]

MAME 0.221

MAME 0.221

Our fourth release of the year, MAME 0.221, is now ready. There are lots of interesting changes this time. We’ll start with some of the additions. There’s another load of TV games from JAKKS Pacific, Senario, Tech2Go and others. We’ve added another Panorama Screen Game & Watch title: this one features the lovable comic strip canine Snoopy. On the arcade side, we’ve got Great Bishi Bashi Champ and Anime Champ (both from Konami), Goori Goori (Unico), the prototype Galun.Pa! (Capcom CPS), a censored German version of Gun.Smoke, a Japanese location test version of DoDonPachi Dai-Ou-Jou, and more bootlegs of Cadillacs and Dinosaurs, Final Fight, Galaxian, Pang! 3 and Warriors of Fate.
In computer emulation, we’re proud to present another working UNIX workstation: the MIPS R3000 version of Sony’s NEWS family. NEWS was never widespread outside Japan, so it’s very exciting to see this running. F.Ulivi has added support for the Swedish/Finnish and German versions of the HP 86B, and added two service ROMs to the software list. ICEknight contributed a cassette software list for the Timex NTSC variants of the Sinclair home computers. There are some nice emulation improvements for the Luxor ABC family of computers, with the ABC 802 now considered working.
Other additions include discrete audio emulation for Midway’s Gun Fight, voice output for Filetto, support for configurable Toshiba Pasopia PAC2 slot devices, more vgmplay features, and lots more Capcom CPS mappers implemented according to equations from dumped PALs. This release also cleans up and simplifies ROM loading. For the most part things should work as well as or better than they did before, but MAME will no longer find loose CHD files in top-level media directories. This is intentional – it’s unwieldy with the number of supported systems.
As usual, you can get the source and 64-bit Windows binary packages from the download page. This will be the last month where we use this format for the release notes – with the increase in monthly development activity, it’s becoming impractical to keep up.

MAME Testers Bugs Fixed

New working machines

New working clones

Machines promoted to working

Clones promoted to working

New machines marked as NOT_WORKING

New clones marked as NOT_WORKING

New working software list additions

Software list items promoted to working

New NOT_WORKING software list additions

Source Changes

submitted by cuavas to MAME [link] [comments]

MAME 0.221

MAME 0.221

Our fourth release of the year, MAME 0.221, is now ready. There are lots of interesting changes this time. We’ll start with some of the additions. There’s another load of TV games from JAKKS Pacific, Senario, Tech2Go and others. We’ve added another Panorama Screen Game & Watch title: this one features the lovable comic strip canine Snoopy. On the arcade side, we’ve got Great Bishi Bashi Champ and Anime Champ (both from Konami), Goori Goori (Unico), the prototype Galun.Pa! (Capcom CPS), a censored German version of Gun.Smoke, a Japanese location test version of DoDonPachi Dai-Ou-Jou, and more bootlegs of Cadillacs and Dinosaurs, Final Fight, Galaxian, Pang! 3 and Warriors of Fate.
In computer emulation, we’re proud to present another working UNIX workstation: the MIPS R3000 version of Sony’s NEWS family. NEWS was never widespread outside Japan, so it’s very exciting to see this running. F.Ulivi has added support for the Swedish/Finnish and German versions of the HP 86B, and added two service ROMs to the software list. ICEknight contributed a cassette software list for the Timex NTSC variants of the Sinclair home computers. There are some nice emulation improvements for the Luxor ABC family of computers, with the ABC 802 now considered working.
Other additions include discrete audio emulation for Midway’s Gun Fight, voice output for Filetto, support for configurable Toshiba Pasopia PAC2 slot devices, more vgmplay features, and lots more Capcom CPS mappers implemented according to equations from dumped PALs. This release also cleans up and simplifies ROM loading. For the most part things should work as well as or better than they did before, but MAME will no longer find loose CHD files in top-level media directories. This is intentional – it’s unwieldy with the number of supported systems.
As usual, you can get the source and 64-bit Windows binary packages from the download page. This will be the last month where we use this format for the release notes – with the increase in monthly development activity, it’s becoming impractical to keep up.

MAME Testers Bugs Fixed

New working machines

New working clones

Machines promoted to working

Clones promoted to working

New machines marked as NOT_WORKING

New clones marked as NOT_WORKING

New working software list additions

Software list items promoted to working

New NOT_WORKING software list additions

Source Changes

submitted by cuavas to cade [link] [comments]

Wine 4.0-rc1 Released

The Wine development release 4.0-rc1 is now available.
 
This is the first release candidate for the upcoming Wine 4.0. It marks the beginning of the code freeze period.
There have been many last minute changes, so please give this release a good testing to help us make 4.0 as good as possible.
 
https://www.winehq.org/announce/4.0-rc1 
 
What's new in this release (see below for details):
 
- Preloader implemented on mac OS. - Mouse cursor support on Android. - Updates to the timezone database. - Vulkan support updated to the latest spec. - Stream I/O support in WebServices. - Better palette support in WindowsCodecs. - Synchronization objects support for kernel drivers. - Various bug fixes. 
 
The source is available from the following locations:
http://dl.winehq.org/wine/source/4.0/wine-4.0-rc1.tar.xz http://mirrors.ibiblio.org/wine/source/4.0/wine-4.0-rc1.tar.xz 
 
Binary packages for various distributions will be available from:
http://www.winehq.org/download 
 
You will find documentation on
http://www.winehq.org/documentation 
 
You can also get the current source directly from the git repository.
Check
http://www.winehq.org/git for details. 
 
Wine is available thanks to the work of many people.
See the file AUTHORS in the distribution for the complete list.
 
 
Bugs fixed in 4.0-rc1 (total 43):
 
5402 Multiple MFC-based apps crash during non-modal child dialog control creation with active window being zero (Canon PhotoStitch 3.1.13, Flexible Renamer v8.4) 16845 Radio buttons not being checked on focus 23750 SpongeBob SquarePants: Diner Dash 2 - mouse has pink background 28810 d3dx9_36/tests/mesh.ok: D3DXLoadMeshTest fails under valgrind 29183 Heavy corruption when rendering edit control with WM_PRINTCLIENT and possibly invalid HDC 33117 Can't load Bach41.ttf with CreateFontIndirect 35367 Multiple applications crash due to Wine ole32 code not taking implicit MTA into account (Cyberlink Powerdirector 8, PDFXChange Editor 5.5) 37863 Halo only works using Nvidia graphics 38228 Wildstar game failed to download : `winhttp:session_set_option 0` and `wine client error:41b: pipe: Too many open files` 40031 Singularity: In Steam the game is still running after quit 40880 Commandos 3: Destination Berlin demo has sound issues 40971 Zombie Army Trilogy crashes before the menu 41404 WPS Office 10.1.0.5775 unhandled exception on installation 41488 ProfitChart RT crashes at startup 42010 ReactOS Calc does not show dots in radio buttons. 42255 Xenia emulator needs ntdll.dll.RtlAddGrowableFunctionTable implementation 42474 Multiple applications crash on unimplemented function api- ms-win-core-path-l1-1-0.dll.PathCchCombineEx (Python 3.6, AutoFlashGUI, RenderDoc) 42582 Murdered: Soul Suspect has messed up rendering 43584 Hitman: Absolution needs dxgi_output_GetGammaControlCapabilities 43745 Graywalkers Purgatory demo has wrong models rendering 43889 Gradient is inverted when using gdiplus 44015 Steam - fails to load UI since Wine 2.20 (due to dwrite commit) 44177 Guitar Pro 5: Long freezes during draw process of dashed lines (P.M. or let ring markers) 44588 Many kernel drivers need support for kernel synchronization objects (event, semaphore, mutex) (BattleEye's 'bedaisy.sys', Franson VSerial service 'bizvserialnt.sys') 44897 Multiple applications using Crashpad/Chromium/CEF in Win7+ mode crash on unimplemented function ntdll.RtlGetUnloadEventTraceEx (Steam client) 44999 Python 3.6.5 crashes due to unimplemented function api-ms- win-core-path-l1-1-0.dll.PathCchCanonicalizeEx. 45431 Multiple D3D11 games deadlock in IDXGISwapChain::ResizeTarget while trying to resize window (Crash Bandicoot N. Sane Trilogy, Dragon Age: Inquisition) 45453 Guild Wars 2: Launcher crashes with assertion "jobThreads && (jobThreads <= hardwareThreads)" 45627 mdac28 fails to install (SetupDefaultQueueCallbackW copy error 32 L"C:\\users\\austin\\Temp\\IXP000.TMP\\msdaorar.dll") 46093 GRLevel3 2.52 fails to start, hangs indefinitely 46099 Star Citizen not loading after implementation of WaitOnAddress() in wine 46140 .NET applications using 'WebRequest' API with MS .NET Framework crash when IPv4/6 is disabled in Linux kernel 46142 Games launched through Windows Steam no longer launch. 46161 Wine: Wrong GnuTLS usage? 46168 dotnet35sp1 installer has an error under wow64 46172 Multiple applications from Windows 7-10 crash on unimplemented function slc.dll.SLGetLicensingStatusInformation 46173 Used e-Sword successfully a few months ago, but when I try now I get a Program Error. 46179 Multiple Windows 10 ARM{32,64} apps need 'kernel32.dll.GetCurrentThreadStackLimits' to get stack start address 46180 wineserver does not release atom on unregistering window classes 46186 LoadImageA searches images in the wrong directory 46210 explorer /desktop leaks atoms from DDE interface 46229 serveptrace: NetBSD debug register storage 46235 Opening ADODB.Connection results in: Method '~' of object '~' failed 
submitted by catulirdit to linux_gaming [link] [comments]

Wine 4.0-rc1 Released

The Wine development release 4.0-rc1 is now available.
 
This is the first release candidate for the upcoming Wine 4.0. It marks the beginning of the code freeze period.
There have been many last minute changes, so please give this release a good testing to help us make 4.0 as good as possible.
 
https://www.winehq.org/announce/4.0-rc1 
 
What's new in this release (see below for details):
 
- Preloader implemented on mac OS. - Mouse cursor support on Android. - Updates to the timezone database. - Vulkan support updated to the latest spec. - Stream I/O support in WebServices. - Better palette support in WindowsCodecs. - Synchronization objects support for kernel drivers. - Various bug fixes. 
 
The source is available from the following locations:
http://dl.winehq.org/wine/source/4.0/wine-4.0-rc1.tar.xz http://mirrors.ibiblio.org/wine/source/4.0/wine-4.0-rc1.tar.xz 
 
Binary packages for various distributions will be available from:
http://www.winehq.org/download 
 
You will find documentation on
http://www.winehq.org/documentation 
 
You can also get the current source directly from the git repository.
Check
http://www.winehq.org/git for details. 
 
Wine is available thanks to the work of many people.
See the file AUTHORS in the distribution for the complete list.
 
 
Bugs fixed in 4.0-rc1 (total 43):
 
5402 Multiple MFC-based apps crash during non-modal child dialog control creation with active window being zero (Canon PhotoStitch 3.1.13, Flexible Renamer v8.4) 16845 Radio buttons not being checked on focus 23750 SpongeBob SquarePants: Diner Dash 2 - mouse has pink background 28810 d3dx9_36/tests/mesh.ok: D3DXLoadMeshTest fails under valgrind 29183 Heavy corruption when rendering edit control with WM_PRINTCLIENT and possibly invalid HDC 33117 Can't load Bach41.ttf with CreateFontIndirect 35367 Multiple applications crash due to Wine ole32 code not taking implicit MTA into account (Cyberlink Powerdirector 8, PDFXChange Editor 5.5) 37863 Halo only works using Nvidia graphics 38228 Wildstar game failed to download : `winhttp:session_set_option 0` and `wine client error:41b: pipe: Too many open files` 40031 Singularity: In Steam the game is still running after quit 40880 Commandos 3: Destination Berlin demo has sound issues 40971 Zombie Army Trilogy crashes before the menu 41404 WPS Office 10.1.0.5775 unhandled exception on installation 41488 ProfitChart RT crashes at startup 42010 ReactOS Calc does not show dots in radio buttons. 42255 Xenia emulator needs ntdll.dll.RtlAddGrowableFunctionTable implementation 42474 Multiple applications crash on unimplemented function api- ms-win-core-path-l1-1-0.dll.PathCchCombineEx (Python 3.6, AutoFlashGUI, RenderDoc) 42582 Murdered: Soul Suspect has messed up rendering 43584 Hitman: Absolution needs dxgi_output_GetGammaControlCapabilities 43745 Graywalkers Purgatory demo has wrong models rendering 43889 Gradient is inverted when using gdiplus 44015 Steam - fails to load UI since Wine 2.20 (due to dwrite commit) 44177 Guitar Pro 5: Long freezes during draw process of dashed lines (P.M. or let ring markers) 44588 Many kernel drivers need support for kernel synchronization objects (event, semaphore, mutex) (BattleEye's 'bedaisy.sys', Franson VSerial service 'bizvserialnt.sys') 44897 Multiple applications using Crashpad/Chromium/CEF in Win7+ mode crash on unimplemented function ntdll.RtlGetUnloadEventTraceEx (Steam client) 44999 Python 3.6.5 crashes due to unimplemented function api-ms- win-core-path-l1-1-0.dll.PathCchCanonicalizeEx. 45431 Multiple D3D11 games deadlock in IDXGISwapChain::ResizeTarget while trying to resize window (Crash Bandicoot N. Sane Trilogy, Dragon Age: Inquisition) 45453 Guild Wars 2: Launcher crashes with assertion "jobThreads && (jobThreads <= hardwareThreads)" 45627 mdac28 fails to install (SetupDefaultQueueCallbackW copy error 32 L"C:\\users\\austin\\Temp\\IXP000.TMP\\msdaorar.dll") 46093 GRLevel3 2.52 fails to start, hangs indefinitely 46099 Star Citizen not loading after implementation of WaitOnAddress() in wine 46140 .NET applications using 'WebRequest' API with MS .NET Framework crash when IPv4/6 is disabled in Linux kernel 46142 Games launched through Windows Steam no longer launch. 46161 Wine: Wrong GnuTLS usage? 46168 dotnet35sp1 installer has an error under wow64 46172 Multiple applications from Windows 7-10 crash on unimplemented function slc.dll.SLGetLicensingStatusInformation 46173 Used e-Sword successfully a few months ago, but when I try now I get a Program Error. 46179 Multiple Windows 10 ARM{32,64} apps need 'kernel32.dll.GetCurrentThreadStackLimits' to get stack start address 46180 wineserver does not release atom on unregistering window classes 46186 LoadImageA searches images in the wrong directory 46210 explorer /desktop leaks atoms from DDE interface 46229 serveptrace: NetBSD debug register storage 46235 Opening ADODB.Connection results in: Method '~' of object '~' failed 
submitted by catulirdit to wine_gaming [link] [comments]

ExpertOption Review

Compared to other binary options brokers out in the market, ExpertOption is relatively new but is starting to gain traction among established traders. As a trading platform, the website is under the supervision of the Russian FMMRC, with the license number TSRF RU 0395 AA Vv0084.
We reviewed this trading platform, and based on the initial data and experience that we have collected, we can say that we are satisfied with the results. Our initial thoughts is that this trading platform can work for beginners, or those who want to start small in trading.

ExpertOption Trading Software

The user interface is easy to understand, and provides guidance to traders on how to perform the trades. The platform also provides choices when it comes to assets like indices, currency pairs and commodities like crude oil and gold. The only concern here is that traders are only offered short term expiry times. There is also an app that can be downloaded on iOS, and an app for Android devices are expected to follow.
As a broker, ExpertOption is known to deliver a number of promising features. But one should keep in mind that the type of services that can be enjoyed will depend on the type of account opened with the website. There are four different types of accounts that customers can consider. Each account has its own set of features and benefits, and we recommend that the interested trader should check each option and the features that come with it.
One of the things that you will notice with the platform is the comprehensive explanation of the bonus terms, and this can be read in the website’s Terms section. These bonuses are subject to x50 turnover before the said amount can be withdrawn. Also, the operator gives its members the opportunity to reverse the bonus, but this can be done before placing any trade after collecting the bonus. With ExpertOption, anyone can start small with its $1 minimum trade. This minimal entry fee can help new traders test the market before pushing ahead with large deposits and trades.

Popular Features

The platform used on the website is developed primarily by ExpertOption, which is in contrast with the other trading platforms that make use of the software designed by others. The proprietary software is easy to understand, and can work for both the new traders and experienced ones. The software is loaded with features that can allow traders to complete technical tasks, which can then boost profits and streamline online transactions. Here are other top features and tools that you can enjoy as a member of ExpertOption.
  1. Presence of a Demo Account. There’s a demo account available, and this does not require a download. As soon as you register an account, you will be provided access to this demo account with $1,000 in virtual money. When we tested the demo account, we found out that the account features larger-than-usual profit figures, which is a bad thing since it is conditioning the minds of the traders that they can profit big-time with this platform. We see this as a marketing ploy yo motivate traders to trade real money.
  2. Access to training and educational materials. Just like other trading platforms, ExpertOption also gives its members access to helpful resources that can be used for training. These resources and tools are posted on the site’s Education section. The materials that are contained here can help the beginners get a better understanding of the market and trades. You can also find a Glossary, where the important terms and technical words are explained.
  3. Mobile trading also available. There is a mobile trading platform too which can help traders complete the trades in seconds. The app is available on the Google Play Store or the Apple Store. The app can be downloaded to your iOS or Android phones.

Our Concerns

As a new player in the market, ExpertOption faces some tough challenges. For example, many traders see the platform as untested with no solid experience to speak of. When we tested and reviewed the platform, we are also concerned by its inexperience in handling trades. To help the management improve their services, we have listed some of the things that can be improved on the website.
submitted by Dieterich7 to FINAWIKI [link] [comments]

DEVCON2 report: Day 2 - More session notes & photos

Previous days
Day info
In the evening there was a party up on the rooftop of Bar Rouge http://www.bar-rouge-shanghai.com/
It had a beautiful view over the Shanghai bund. Many people there, but plenty of space to fit everyone. There was some lovely very striking Chinese artwork on the walls http://imgur.com/tWmNTpE http://imgur.com/vB4spwH http://imgur.com/U8gSgu2 http://imgur.com/b2eXPzZ
During the day, Ethereum Tshirts were made available for sale. But less than 30 minutes later most sizes were completely sold out! http://imgur.com/iJR0FHd http://imgur.com/W6mgkDb
`
Sessions
Lots of formal verification sessions in the morning. The afternoon was more dev tools. I was excited about Truffle
Smart contract security
Showed the 1 line mistake that caused The DAO re-entry attack. Pro tip: tag your untrusted accounts in the contract. e.g. Name the variable something like _untrusted_account https://github.com/Consensys/smart-contract-best-practices https://github.com/ethereum/wiki/wiki/Safety
Prepare for failure. Be aware that unknown exploits can be found. Put in escape hatches / kill switches Roll out carefully and test "The strongest swords are forged by continuously putting them in the fire" External calls to other contracts: Try to avoid calling untrusted contracts (one written by someone else). It only takes 1 mistake in an external contract to expose you. Either from a bug, or from your external contract then calling another malicious contract. Use send(), avoid call.value()() Handle errors in raw calls. Raw calls do not propogate exceptions. e.g. if(!address.send()) An attacker could construct a call to max out the call stack, so that when your contract tries to make any calls they fail. Favour PULL over PUSH for payments
Visualising Security
https://github.com/Raineorshine/solgraph How can you spot smart contract vulnerabilities Static analysis can help analyse the code without executing it (like checking for null, then using a variable anyway). Builds up an AST (Abstract Syntax Tree) which can be explored. Created solgraph to do this Dynamic analysis is done by running unit tests (e.g. you can use the Ruby test runner from yesterday's presentation)
Ethereum Security Overview
Can try to manage risk by reducing the likelihood or impact. Security concerns include things like wallets, gaming the system, denial of service
End users wallets isolation: Can reduce your impact by using a hot wallet with a small amount in it. Cold wallets to hold more of it securely There are some hardware based wallets can help secure your wallets Then frozen wallets to keep them offline. Ethereum valut by @Arachnid. Multi sig wallets can help reduce the likelihood
Contracts: When calling another contract, if they use randomness WHERE do they source it from? Can it be gamed? Can anyone access it before you? Sybil attacks (attacker using multiple identities) to game against you Can anyone rage quit and lock up the contract by not interacting with it any more
DAPPS: Use HTTPS, BUT DO NOT USE CDNs Someone could inject malicious JS that will modify your DAAP and redirect payments to another address. Have an upgrade path (for both code and data). Check invariants, use escape hatches / emergency breaks Many potential contract vulnerabilities (see previous talks) Favour PULL over PUSH for payments
Formal verification for Solidity
Writing code correctly is hard. It is easy to test for desired behaviour (the happy path). Hard to check absence of undesired behaviour. Formal verification can help find undesired behaviour. The specifications are usually compiled down to why3 or f* Showed a Why3 GUI that shows your code and highlights lines that are not passing (e.g. because a line doesn't satisfy the conditions that it can't integer overflow.
Microsoft released a research paper allowing the conversion of Solidity & EVM code to f*.
Parity's innovations
Written in Rust (type safe. Memory safe). Is modular, you can tweak it or use preset config files. High transaction throughput. Low latency. Low footprint (suitable for IoT devices). Unsafe APIs are disabled be default. Advanced eafutures like state trie pruning (redued disk space) snapshotting, warp sync, private chains including PoA
Imandra Contracts: Formal Verification for Ethereum Completely tuned out for this. It was very much like a sales pitch, just talking itself up.
Ether.camp annual summary
Released Ethereum Studio. Is available on Azure as an easily deployable Virtual Machine https://azure.microsoft.com/en-in/documentation/templates/ethereum-studio-docker-standalone-ubuntu/ Will help you write unit tests. Spin it up, execute, tear down. A partnership with Santander. Ethereum Cash. You can tie an Ethereum account to a bank account. More info at http://www.coindesk.com/santander-vies-become-first-bank-issue-digital-cash-blockchain/ Created a virtual accelerator hack.ether.camp
Metamask - Bridging ethereum to browsers
Ease of adoption is their core goal User flow. You download, generate a vault (with a deterministic keyphrase). Enter phone number, credit card details, and you can get Ether directly into your metamask account. Done 33 releaes. 12k users. Extension currently runs on chrome. Is ready to be pushed to opera, firefox & Edge RPC requests to a trusted node. Intercepts the RPC calls within the DAPP to redirect to Metamask Feature Requests: Multiple account types (e.g. uPort, remote key stores), make the browser a light client
Building the Light Client Ecosystem
Quick sync (up to 0k headers/sec) 30 secs - 5mins for a full sync (dependant on CPU) Low resource requirements (DB <100mb, RAM < 500mb) RPC interface compatibile with full nodes. Mist already works with it Because light clients rely on full nodes and put higher workload on them, there are some thoughts about having a basic throttled "free" service, and a paid priority system that will give more resources. There are difficult future concerns around scalability. In a future sharded world, may need multiple full nodes to cover all the shards. Future work: do complex operations on server side. Define a "SuperCM" that can answer any question about the chain. Generalised off chain computing for accessing data.
Import Geth: Ethereum from Go and beyond
Geth is one of the 3 origin clients. Evolved throughout the Ethereum prototyping. Needed to include everhtying to develop on top. Followed the Geth -> Mist -> Dapps architecture. Using Geth as a library isn't a good option at the moment. has started to collect technical debt, from prototypes being rapidly iterated on. Geth 1.5 is a concentrated effort to make Geth a library. Client side account management, Remote node APIs, native bindings to contracts, in-process ethereum client Chain exploration, state querying and event subscription over IPC, HTTP or WebSocket. Native contracts. Can generate a Ethereum ABI GO binding that GO code can use? Can create a solidity wrapper for go? In process nodes lets you hose a node within your app. Saves you telling someone to "please go and install an ethereum node". What about supporting this on iOS & Android? Geth 1.3 already ran on mobile platforms. Released an embeddable library in Dec 2015, but is really a proof of concept. Mobile in-process nodes. Easier to call API locally now.
Developing Scalable Decentralized Applications for Swarm & Ethereum
Web 2.0 has issues around scaling & centralised control. When moving to Web 3.0 we need a general purpose distributed backend (swarm/bzz). Said there MAY be interoperability with IPFS. They hope that it will share a lot of the underlying principals with IPFS. I HOPE this happens! Well leverage network effects from IPFS. Logic being pushed to clients (logic in JS in browser, in native mobile
Swarm high level API. URL begins with the collection root hash (like IPFS) bzz:///imgs/example.jpg Can do root hash registration to a friendly name (like IPFS's IPNS) bzz://some.friendly.name/imgs/example.jpg Put static and dynamic data within swarm. Put global state changes onto the blockchain. Local client side only state changes can be stored locally (and optionally backed up to blockchain/swarm) Execute logic locally, but verify it on chain.
Example Dapp Distributed photo album. Webapp resources & data hosted in swarm. Current root hash of collections published to blockchain. Optimised image, thumbnails, etc. are generated client side before uploading (just like facebook, etc. do) Possibility to instead do delegated computation, put the files in swarm, get someone else to process it.
Dapple Dev Workflow
https://github.com/nexusdev/dapple https://github.com/nexusdev/dappsys Dapple looks like a critical thing to integrate into your development suite! If you are into devops, I definitely recommend watching this vid later to see how you could integrate testing flows. http://Dapphub.io EVM Dev Multitool for helping with Dapp developments. Has EVM extensions Has a shared data model "Dappfile". Is a package/dapp descriptor format. Shared global runtime environment blurs line between code packages & deployed code objects. Can chain fork, to help you when testing contracts. Can find dependencies. Custom linker Test harness to use a contract to test other contracts Use the chain forking in your tests. Take live chain, fork, insert your test contract, fork before you call each test method. Deploy: Wallet side scripting. Hijacks call and create, and redirects to side chains. So you can do some dry runs.
Solidity for Dummies
Solidity is a higher level language. Looks like Javascript, but with types. Shame they didn't just use TypeScript ;-) Maybe Solidity 2.0 can migrate to using TypeScript. Solidity is compiled to EVM. Once it is in the EVM it is isloated. Public functions are callable by anybody. That is your contract public surface area / exposed APIs. Contract standards are beginning to emerge e.g. ERC20 interface for tokens. Having a standard for token meant that the community can do cool things, like etherscan.io that lets you look up tokens in the block chain, or EtherEx that is a decentralised token exchange. Lots of IDEs & tools you can use with solidity. Ethereum Studio, Visual Studio, Vim. Solgraph, truffle, dapple, embark.
Getting started guide https://www.reddit.com/ethereum/comments/4ws9um/rethereum_rules_and_getting_started_guide/
New and future features of Solidity
Initial goals of solidity: statically typed. Easily readable. High level. Uses little gas. What has happened in the last year? Build custom types. Internal library functions. Source mapping via AST, for solidity code to EVM, assists with debugging. Future: Formal verification. Authenticated sources & binaries via swarm. Templates. Functions as 1st class citizen. New notation for parallel / async programs
How to create advanced Dapps using embark
Compatible with any build pipeline Supports contracts TDD using Javascript Manages deployed contracts, deploys only when needed (and dependent contracts) Manages different chanes (e.g. testnet, pribate net, livenet) Support for both Solidity and Serpent Contract instances, like inheritence. Embark 2 goals. Facilitate communication between contracts. A cool dashboard, shows which contracts have been deployed, available services (geth whisper, IPFS) EmbarkJS futures: promises and named parameters. Automatic type conversion. Communication abstraction, allows you to plug in supported providers like whisper, etc. Storage abstraction provider (swarm, etc.)
Truffle Development Ecosystem and Future of Ethereum Development Tools
http://truffleframework.com/ https://github.com/ConsenSys/truffle
Truffle is the most widely used Ethereum development framework. 17k+ downloads In v1 Compiliation, deployment, bootstrapping, abstractions, unit testing, quick development. In v2 Network management, Migrations, Modularity, Documentation. Going towards Truffle v3 Ethereumjs-testrpc allows instant mining, account creation, HD wallet support, deterministic. Allows you to fork from any available chain, for a new development chain (sounds like chain forking in Dapple). Take the live chain, fork it, then try developing against contracts in the live net on your dev fork. Solidity unit testing Npm integratoin "npm install my-package". Import sol contracts. Webpack integration. Ether-pudding allows you wo watch for events. Futures: Solidity 0.4 support, better network management, more integrations, more boilerplate, more tutorials.
ENS: Ethereum (Domain) Name System
Why do we need "yet another name service". To allow you to name wallets, files, etc on top of Swarm & IPFS. Existing name servies are ironically centralised within a single place or contract.
What makes a good name service? Separation of concerns, distributed authority, forward compatibility, efficient on-chain resolution. Components: Registrars, ENS Registry, Resolvers. ENS Registry maps the name (hack.eth, nick.hack.eth) to the resolver Resolver is a simple contract that lets you set the address for a name, look up names, etc. Registrars, let people be in charge of a TLD (.eth) and then allow people to register under them (automatically through a smart contract). Initially an auction based registration. Only names under .eth are available.
Making Smart Contracts Smarter: Oyente
https://github.com/ethereum/oyente Smart contracts == one-shot programs. Self executed, cannot patch. Solidity is similar but not the same as Javascript. Original contract code is not always available (but the new solidity feature of putting onto swarm may fix this). Too many smart contracts to manually decompile EVM and check them all. Oyente is a new analyzer for smart contracts. Use cymbolic executions. Detects all popular bugs TOD (transaction ordering dependence), Timestamp dependence, re-entrancy, mishandling exceptions. TOD: Observed state != execution state. The state may change between when you submit a transaction and it is executed. Someone can watch transactions being submitted looking for a critical execution, could quickly snipe and enter your own transaction into the transaction pool as well with a higher fee to try and get yours executed before the other person. Timestamps: Can be manipulated by miners. Oyente Symbolic execution. Can build a tree of every branch and possible execution and run over it. Can detect bugs, test generation, and go over all possible paths.
Beyond the Bubble
Overcoming education and adoption challenges for the Blockchain industry. He is a technical evangelist for blockchain. Last month went and spoke to US gov to advise FBI, CIA, etc. Wants to help grow the blockchain beyond just us very early adopters. Fintech is rapidly developing blockchain solutions. IoT, energy & medical are looking towards adoption. Longer term, governments & non profits.
Why do normal people care? Internet still functions off 1970s tech: Our data is sent in plaintext, leaked by companies, our identities are stolen by hackers, our behaviour is mined and monetized by advertisers. People are beginning to understand the need to have same privacy and security guarantees online as they do offline. Things should be encrypted by default. "Own your own data"
Infura. Ethereum & IPFS infrastructure
https://infura.io/ How do devs ensure that users have access to Ethereum & IPFS. How to make it easier for users to jump in. Didn't show anything. Just talked (only had 10 mins). There was a services called Ferryman that can talk to the IPFS/Ethereum network. Apparently being used by Metamask, uport, regis, truffle.
Testing Ethereum Consensus
There are HEAPS of ethereum clients (Geth, Parity, etc). How can we ensure that they all come to the same consensus? By using a suite of tests. State tests, Blockchain tests, http://ethdocs.org/en/latest/contracts-and-transactions/ethereum-tests/
CarbonVote: A Gauge for Human Consensus
http://Carbonvote.com "Machines serves human. Carbon over silicion. Consensus from community". (use people to make a decision, not computers). Machine consensus is just a tool for human consensus.
Sikorka – Ethereum meets the Outdoors
A system that facilities deploying smart contracts in real world locations. Enables smart contracts to interface with environment. Provide "proof of presence" that a user is indeed in correct location. Potential uses: loyalty programs offering discounts to people visiting specific locations. Proving attendance in a location for official purposes e.g. administrative, corporate, AR games. Proof or Presence: using mobile phones and software - geolocation data (can be spoofed) use a challenge question (e.g. what is the last word on a monument's plaque). Scannable QR codes, RFID tags, beacons. Sikorka works by deploying contracts that follow a specific interface. Interaction with contract only happens after PoP.
Remix and Other Ethereum Development Tools
https://github.com/ethereum/remix smart contract debugging Is a NPM module. Looks very early stage. Says it can be integrated into other tools like Dapple, truffle, ethereum studio, Visual Studio, etc.).
Mango: Git Completely Decentralized
https://Github.com/axic/mango Git on Ethereum, IPFS & Swarm Harder to take down a central repo (e.g. Github) Proof of existence for source coode. Ethereum is a decentralised system. Its source code should be available in a decentralised manner. Using IPFS or Swarm, the files are chunked up and stored. So if you have a large file that only changes a few bytes, it can de-dupe and only store the chunks with differences. Git is a merkle tree. IPFS/Swarm directly store as a merkle tree/dag (There are some good talks by Juan Bennet from IPFS talking about how you can do this)
Naïve implementation, store everything in a contract on a blockchain, would cost 50M ether
Useful implementation, store objects in IPFS or Swarm to store the data off chain. Then map the IPFS identifies to git identifiers. Save those identifiers on the blockchain so you know what to look up.
Hook it up so that a git push updates the commit hash to contract, then pushes to IPFS. Reduces gas cost to 140,000 down from 5m Every git repo has its own contract. Future work could let you expose your git repo via ENS (Ethereum Name Service) e.g. solidity.ethereum.mango.eth Future of Mango: store release notes within git. Store issues within git. Store pull requests. Create user friendly web frontends
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