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--- blockchain [2017/09/21 06:31] – created stephen
+++ blockchain [2017/12/01 01:19] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ====== Blockchain ======
+===== Links =====
+  * [[https://nethereum.readthedocs.io/en/latest/|Nethereum Documentation]]
+  * [[https://github.com/ethereumjs/testrpc#usage|Testrpc command line options]]
+  * [[https://stackoverflow.com/questions/47543679/how-do-i-compile-a-solidity-contract-with-an-import-to-standalone-byte-code|How do I compile a Solidity contract with an import to standalone byte code?]]
+===== General Notes =====
+  * Make sure the constructor of the contract has the correct access modifiers:
+<code>
+function MegaContract() public payable {
+</code>
+==== Security ====
+To do anything that requires gas, either unlock the account beforehand with the password:
+<code>
+var address = "...";
+var password = "...";
+var web3 = new Web3();
+var unlockAccountResult = await web3.Personal.UnlockAccount.SendRequestAsync(address, password, 120);
+Assert.IsTrue(unlockAccountResult);
+</code>
+Or use the private key to create the Web3 object:
+<code>
+var privateKey = "...";
+var web3 = new Web3(new Account(privateKey));
+</code>
+===== Questions =====
+  * [[https://stackoverflow.com/questions/47543679/how-do-i-compile-a-solidity-contract-with-an-import-to-standalone-byte-code|How do I compile a Solidity contract with an import to standalone byte code?]]
+  * How to I get the result of calling an external function with Nethereum?
+===== Tool Set Install =====
+  - Metamask Chrome extension.
+  - (Visual Studio Code)
+  - NodeJS
+  - [Admin PowerShell] ''<nowiki>Set-ExecutionPolicy -ExecutionPolicy RemoteSigned</nowiki>''
+  - Chocolately
+  - [Admin PowerShell] ''<nowiki>choco install git -params "/GetAndUnixToolsOnPath"</nowiki>''
+  - [Admin PowerShell] ''<nowiki>git config --system http.sslverify false</nowiki>''
+  - [Admin PowerShell] ''<nowiki>npm install -g node-gyp</nowiki>''
+  - [Admin PowerShell] ''<nowiki>npm install --global --production windows-build-tools</nowiki>''
+  - [Admin PowerShell] ''<nowiki>npm install -g ethereumjs-testrpc</nowiki>''
+  - [Admin PowerShell] ''<nowiki>npm install -g truffle</nowiki>''
+===== Commands =====
+| ''<nowiki>truffle init</nowiki>'' | Set up project. |
+| ''<nowiki>testrpc</nowiki>'' | Start RPC. |
+| ''<nowiki>truffle.cmd comp</nowiki>'' | Compile everything. |
+| ''<nowiki>truffle.cmd migrate</nowiki>'' | Deploy everything. |
+| ''<nowiki>truffle.cmd console</nowiki>'' | Console mode (to interact with contract). |
+| [Truffle Console] ''<nowiki>var hw</nowiki>'' | Create a variable to reference our contract. |
+| [Truffle Console] ''<nowiki>HelloWorld.deployed().then(function(deployed){hw=deployed;});</nowiki>'' | Get the reference (note that it is async). |
+| [Truffle Console] ''<nowiki>hw.SayHello.call()</nowiki>'' | Call a **read-only** method on the contract. |
+| [Truffle Console] ''<nowiki>hw.sendCoin('0x8...', 100)</nowiki>'' | Call a **modifying** method on the contract. |
+| [Truffle Console] ''<nowiki>.exit</nowiki>'' | Exit console mode. |
+===== Implementations of Ethereum blockchange =====
+^ Implementation ^ Language ^ Pruning ^ Notes ^
+| Geth | Go | Yes | |
+| Parity | Rust | Yes | |
+| EthereumJ | Java | Yes | |
+| Eth | C++ | No | Reference implementation is meant for developers only. |
+| PyEthApp | Python | No | |
+===== Glossary =====
+| ABI | Application Binary Interface. Is basically how you call functions in a contract and get data back. Like a WSDL or .h file in C. |
+===== VS Code =====
+Use the [[https://marketplace.visualstudio.com/items?itemName=JuanBlanco.solidity|Solidity]] extension.
+  * F5 - Compilation of the current contract
+  * Ctrl + F5 - Compilation of all the contracts
+===== Nethereum =====
+Start with [[https://www.nuget.org/packages/Nethereum.Web3/|Nethereum.Web3]].
+==== Tutorial ====
+Video is [[https://www.youtube.com/watch?v=4t5Z3eX59k4|here]].
+  - [VS Code] Write contract
+  - [VS Code] Compile contract
+  - [Command Line] Start Geth
+  - [VS] Create unit test project.
+  - [VS] NuGet install Nethereum.Web3 + dependencies.
+===== Dev VM =====
+Geth's encrypted accounts key store files can be found in ''%APPDATA%/Ethereum''.
+==== Run Geth ====
+  - Open a //separate// DOS ConEmu.
+  - [ConEmu DOS] Run the command, ''C:\Users\TallGuy-DevVm\Dev\Geth\startgeth.bat''
+  - Open a //separate// Admin PowerShell ConEmu.
+  - [ConEmu PowerShell] Run the command, ''(Get-Process geth).PriorityClass = <nowiki>"BelowNormal"</nowiki>''