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Contributing to EOS Token Sale with MyEtherWallet & Contract Inner-Workings
8 hours ago
sandwich56 in eos
eos-blockchain.png
There's been a bit of confusion about how to contribute to the EOS ICO with MyEtherWallet. I speculate this is an inadvertent result of Dan being spoiled by Graphene blockchains, and the inherent ease of building a web-interface on top of them. By using MetaMask, the EOS team could come close to meeting these high standards. The reality is likely a bit different, but I digress...
The nature of this ICO almost demands a user interface, and by having one, helps you understand various parameters and avoid potentially catastrophic validation mistakes and/or process omissions. Because MyEtherWallet only aggregates interfaces in a very rudimentary way, you are imposing a great deal of usability constraints onto yourself when attempting to interact with the EOS Token Sale contract in this way.
All that aside, some people don't want to use MetaMask or don't use Chrome. Some just insist on using MyEtherWallet (MEW). This article is directed towards this niche group of users.
It took quite a bit of time to figure out how contributing with MEW would be accomplished, and in doing so learned a great deal about how this contract was structured. While the following article does explain how to participate in the ICO using MEW, it has not been verified or tested by anyone (since it cannot be tested yet)
Because of this, I did not skimp on any details, and will probably be the most tl;dr article you will (or will not) read today.
This article assumes you already have a funded ETH wallet and prior MyEtherWallet experience
You've Been Warned
THE INSTRUCTIONS BELOW ARE UNTESTED, I WILL UPDATE THIS MESSAGE AND OR CORRESPONDING INSTRUCTIONS ONCE I HAVE TESTED IT MYSELF. IT IS NOT RECOMMENDED THAT YOU FOLLOW THESE INSTRUCTIONS UNTIL THIS MESSAGE IS GONE
USE AT YOUR OWN RISK. THIS IS NOT LEGAL OR INVESTMENT ADVICE. IT IS HIGHLY SUGGESTED YOU READ THIS ARTICLE IN IT'S ENTIRETY AND UNDERSTAND THE IMPLICATIONS BEFORE CONDUCTING A TRANSACTION. IF YOU'RE A US CITIZEN OR RESIDENT YOU CANNOT PARTICIPATE IN EOS TOKEN SALE AND BY EXERCISING THIS CONTRACT YOU ARE AGREEING TO THOSE TERMS.
About the EOS Token Sale
Here's a wonderful article written by
Technical Explanation of the Official EOS Distribution Web-Interface
The EOS Distribution page simplifies the interaction with their Ethereum Contract to make the process easier on the user with significantly lower possibility of error. So here is the breakdown of this simplification:
Button to Generate EOS Token client-side via JS.
Step to remind you to store your key-pair and nags for a private key confirmation.
When you click "I have safely backed up my private key," it calls the "register" function in the EOS Token contract which maps the EOS key you just generated to the active Ethereum wallet (address/pub key) in MetaMask. More on this below.
You then enter how many ETH you would like to contribute from the currently loaded MetaMask Wallet. Behind the scenes, it's passing the ETH amount, the number representing the window period you are contributing to (depending on the value of the dropdown) and it is passing a "0" for an argument called "limit" that doesn't seem to be exposed in the interface (more on that later) to a function called buyWithLimit()
Note: One of the biggest conveniences of the provided interface is the availability of "window periods" represented as numbers in a dropdown. Obtaining these numbers, cross-correlating them to a contribution window and subsequently understanding that particular contribution period's economic parameters is near impossible at this moment in time strictly through MEW.
Prerequisites
Prior MyEtherWallet experience
A funded Ethereum Wallet.
You will need to obtain the following information, which will be available on EOS.io at June 26th, 2017 at 13:00 UTC.
Token Sale Contract address
Token Sale ABI / JSON Interface
While I found this information by browsing source code, you shouldn't trust me or anyone else other than the official page to give it to you, it should always be obtained from the official site. Because of this, I have chosen not to include the contract address or interface code.
Instructions
REMINDER: The contract is not live, so I am not able to test these instructions
Step 1: Generate EOS Key-pair
Visit the EOS Token Generator created by 
Click Generate EOS key
CAREFULLY SAVE THE GENERATED KEY-PAIR
I cannot stress enough: SAVE THESE KEYS, write them down, put them in a safe, save them in an encrypted password manager with redundant backups and/or whatever your personally defined, paranoiac entropy ritual entails. Make sure you've copied them correctly! This cannot be stressed enough, you will need these to access your native EOS tokens in approximately a year!
Step 2: Registering/Mapping your EOS Key
About EOS Key Mapping
Registering your EOS key will map the key-pair you generated earlier, the public key of your future EOS wallet, to the Ethereum Address this transaction is broadcasted from. It is very important to understand this, because 48 hours after the token sale ends, ERC20 tokens can no longer be transferred, and where they live at that moment in time will be where they die, only to be reborn on the EOS blockchain according to the mapping defined by this function.
(takes deep breath)
If you move the tokens to an exchange, and fail to move your tokens back to Ethereum address you have the private keys for and have mapped to an EOS address, you will not have access to those EOS tokens on the native chain after June 1st 2018.
...But relax, you have time, there is no rush or need for anxiety yet, as of right now it's 341 days away
Does it matter when the EOS keys are mapped to an Ethereum Wallet?
Before I get into the technicals, which EOS has kindly simplified this through their user friendly interface, let me say this:
All that's really important is that you have a valid EOS key-pair whose public key is mapped to an Ethereum wallet containing EOS ERC20 tokens BEFORE the end of the 48 hour grace period following the end of the EOS token sale on June 1, 2018 at 22:59:59 UTC
(takes another deep breath)
So Technically, registering your EOS key can be completed at your discretion, before or after funding the contract.
For the sake of simplicity, this guide will consider key registration as the first step, however as outlined above, it can be completed at any point before the ERC20 tokens are frozen
How to Register your EOS Key
YOU ONLY NEED TO MAP AN EOS KEY TO AN ETHEREUM ADDRESS ONCE! DOING MORE THAN ONCE IS JUST WASTING MONEY!
You're going to need that Contract Address and ABI / JSON Interface I mentioned earlier
Go to https://www.myetherwallet.com/#contracts
Paste in the Contract Address and ABI/JSON Interface code
Click Access
Under "Read / Write Contract" select registerfrom dropdown.
In the field named Key enter the EOS Public Key you generated earlier. DO NOT, I repeat, DO NOT enter your Private key here.
Load your wallet using any one of the methods listed, for this example I used the Keystore File. Enter the password to your wallet in the very likely event is is encrypted. If it's not encrypted, may Murphy's Law forever be in your favor.
Click Unlock
Click Write
Set Amount to send to 0 and Gas Limit to at least 90000. If your TX fails, increase Gas Limit. If you would like your TX to go through more quickly, choose your gas limit accordingly.
Click "Generate Transaction"
Check the details of the transaction, and if you are confident, click Yes, I am sure! Make transaction
If all went well, a green bar will appear at the bottom of the page including a link to your transaction on the blockchain.
Step 3: Fund EOS Contract (The Current Window, "Today")
There's really two ways to do this, but for the sake of simplicity we'll do it the easiest way.
You're going to need that Contract Address
Go to https://www.myetherwallet.com/#send-transaction
Load your wallet using any one of the methods listed, for this example I used the Keystore File. Enter the password to your wallet in the very likely event is is encrypted. If it's not encrypted, may Murphy's Law forever be in your favor.
Click Unlock button
In Address field, enter the contract address.
In Amount to send field, enter the amount you would like to contribute.
Set Gas Limit to at least 90000. If your TX fails, increase Gas Limit. If you would like your TX to go through more quickly, choose your gas limit accordingly.
Click Generate Transaction button
Check the details of the transaction, and if you are confident, click Yes, I am sure! Make transaction
If all went well, a green bar will appear at the bottom of the page including a link to your transaction on the blockchain.
Caveat: Until someone publishes an interface that's autonomous from the official distribution page (hint, hint), you will not know the current rate without first using MetaMask ... If you're using MetaMask, why are you still reading this?
Note: There is a function in contract that allows more control over buying that is not exposed in GUI. However, I'm not sure how this function would work in actuality. After I test this functionality and confirm its efficacy, I will add it to this guide.
Step 4: Claim EOS Tokens
You can claim tokens at the end of any window you have contributed to. You will want to claim the tokens if you intend on trading them on exchanges. Each time you claim it will cost you some Ether, so you may want to wait it out.
You're going to need that Contract Address and ABI / JSON Interface I mentioned earlier
Go to https://www.myetherwallet.com/#contracts
Paste in the Contract Address and ABI/JSON Interface code
Click Access
Under the "Read / Write Contract" heading, in the dropdown select claimAll.
Load your wallet using any one of the methods listed, for this example I used the Keystore File. Enter the password to your wallet in the very likely event is is encrypted. If it's not encrypted, may Murphy's Law forever be in your favor.
Click Unlock button
Click Write button
Set Amount to send to 0 and Gas Limit to at least 90000. If your TX fails, increase Gas Limit. If you would like your TX to go through more quickly, choose your gas limit accordingly.
Click Generate Transaction button
Check the details of the transaction, and if you are confident with the details you have entered, click Yes, I am sure! Make transaction
If all went well, a green bar will appear at the bottom of the page including a link to your transaction on the blockchain.
Unanswered Questions
What happens if a single EOS public key is mapped to multiple Ethereum addresses?
Can register() be called from the Ethereum wallet to update its mapping to an EOS public key?
How does buyWithLimit() work in practice? Are funds not meeting limit requirements returned when running claimAll()? If so, where is the code for this?
Conclusion
I strongly suggest you use the official EOS distribution page with MetaMask integration. It takes far less time, and the chances of making a mistake are many orders of magnitude lower. If you're an advanced user and comfortable with MEW, you may have found this helpful. If you've found an error, please let me know!
Recap
Generate and save EOS key pair
Register (map) your EOS public key to your Ethereum Wallet (technically anytime before end of Token Sale)
Fund Contract from Ethereum Wallet you have mapped with your EOS key (or be sure to send the ERC20 tokens there by end of Token Sale)
Claim your tokens if you would like to transfer them.
Remember that your EOS ERC20 tokens should be in a wallet mapped to an EOS public key that you posses the private keys for sometime before the end of the ICO.
If you have no specific reasoning for preferring MEW you should really visit this article by 
Again, USE at your own risk i don't own this!