Contract Source

In order to comply with blockchain's rationale, we are glad to share all contract codes in GitHub:



Welcome to take a look and comment it if any!

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Instant blockchain game (less than 4 seconds per round!)

Our progress is far better than expected in developing a workaround for random number generation under blockchain environment! Here is the brief description how it works.

If you have installed MetaMask in Chrome or Firefox, welcome to have a try in this technical demo by switch to Ropsten testnet:

https://eth888.io/games/HooHeyHow/index.html

You may get some Ethers from this faucet:

https://faucet.metamask.io/


There are three major concerns in design:

convince the players that the decision made by the platform was before themplayers can contribute their inputs to affect number generationplayers are unable to control the resultFor point 1, we provide a SHA256 encrypted hash to the players before any bets placed. The key to this hash actually is a random server-side seed (a long random string) generated from a centralized world (a private client node in Ethereum network). The seed is already stored in a private database (no public end-point). Once result available, the server-side seed will b…
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Smart Contract and Random Number

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It is really awesome that Ethereum support easy-deployment of smart contract by individual developers! The language / script is using called Solidity.

However, unlike coding in ordinary environment, it is running in blockchain network, so we don't have a function simply to seed and generate numbers, as all outputs from blockchain network are deterministic.
Blockhash
This is an approach for games which are merely for fun or with a relatively small bet, as its number generation algorithm is transparent and shown in the smart contract and also its inputs, like blockhash (an unique long text for labelling a block) and block number (completely deterministic). Normally, blockhash is unpredictable but if the bet is extremely large or worthy, miners can choose to whether publish a new block to the network, so they can have some degrees of control in blockhash generation for result manipulation. Here is a simple:
contract random { /* Generates a random number from 0 to 100 based on the l…
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Adding Vanil tokens to your wallet

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MyEtherWallet


Select "Send Ether & Tokens" section in the top tab bar.



On the lower right hand side, click "Add Custom Token".



Fill in three fields:

Address: 0x748183ca2e34279579ae21b16f93dcd3bbe3e3ed

Token Symbol: VAN

Decimals: 18



Afterwards, Click Save.



It shows the balance of yours Vanil tokens.


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MetaMask


Select "TOKENS" tab.



Fill in three fields:

Token Contract Address: 0x748183ca2e34279579ae21b16f93dcd3bbe3e3ed

Token Symbol: VAN

Decimals of Precision: 18




Afterwards, Click Save.



It shows the balance of yours Vanil tokens.







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