Topic: 300 BTC Coding Contest: Distributed Exchange (MasterCoin Developer Thread) - page 62. (Read 129207 times)

Payment confirmed, thanks again!

Well deserved! Congrats to all of you!

Enjoy your BTC!!!

http://blockchain.info/tx/7bca457e1a7297225d34005442cc7e7d1a21d45f16ff1efe573741d1119356f0

MSC coming soon

I would have really preferred the previous P2SH address (starting with 3), but I understand the technical difficulties.
If then, 1Mint2BdVyh6iCKurX9qPpcPFcD6WT3Eai is the second best

Here's the new address for grazcoin, sent via PM:


Sweet. Almost ready to proceed. Can you double/triple/quadruple check and confirm this address publicly, please? Someday I know I'm going to make a mistake with something like this, and I'd like it to not be today

I spoke to the board about this, and we are agreed that the payout is 180 BTC, based on the price the day the contest ended. The only way I'll change the payout amount is if the price of BTC drops dramatically.

Hit a minor snag trying to set this transaction up this morning: Armory doesn't like P2SH addresses (I get an error message). It looks like I need a standard BTC address from you grazcoin. Sorry!

(Sent grazcoin a PM)

Sorry for the delay!

Confirmed as well. Since the price is very volatile the last 24 hours (High: 146.95, low: 135.00) I would recommend you change the amounts before paying out or you might pay out too much, or too little.   

confirmed.
We should make sure that also such addresses (P2SH) could get mastercoins.

Address confirmed, thanks JR!

Since there is quite a bit of money at stake, please double, triple, quadruple check the addresses above. I'll probably do this transaction tomorrow. I don't like to delay, but making a mistake with one of these addresses would be very bad!

Time to buy some MSC:

Congrats guys, you are amazing!

Well done guys, been a busy month so time to relax for a couple days!

Congrats guys. I think we should be very proud of what we accomplished together in such a short timeframe!

congratz to all
Thank you dacoinminster!

I now have the requested info from the three main participants, which I plugged into my spreadsheet which already had my own opinion. After my magic math, the following numbers came out:

Tachikoma: 48%
Grazcoin: 26%
Zathras: 24%
Bitoy: 2%

Zathras included maraoz in his payouts distribution suggestion (maraoz withdrew from the contest), but that didn't actually affect the outcome because I was actually looking at the ratios between contestants rather than the total percentages (i.e. person X thinks person Y deserves twice as much as person Z . . . and that's all I'll say about the magic formulas!).

My heartfelt thanks to each of you. Payment will be sent once I give the board the opportunity to exercise their veto power.

A final overview of my contributions to the contest as requested.

With thanks to:
* Bouncy Castle for their crypto library (SHA & bignum)
* James Newton-King for the JSON.NET library (serialize/deserialize JSON)
* Tachikoma for the multisig specification

CODE CONTRIBUTIONS:

Masterchest Library - a .NET DLL that gives potential new mastercoin developers the ability to use functions with a single line of code

Download: source/binaries

 * Class structures to hold the various RPC responses
 * Decode mastercoin transactions (generate (exodus purchase), simple send and multisig)
 * Encode mastercoin transactions (multisig only, simple send not offered to minimize blockchain bloat) creating the raw transaction hex from scratch
 * Get a list of addresses in wallet from bitcoind/qt (using both listbyreceivedaddress and listunspent to get all addresses including change)
 * Retrieve a blockhash from bitcoind/qt
 * Retrieve a block from bitcoind/qt
 * Retrieve the block currently being mined from bitcoind/qt
 * Retrieve transactions from bitcoind/qt
 * Evaluate a bitcoin transaction and return whether it contains a mastercoin transaction

Masterchest Engine - a blockchain scanning & mastercoin transaction processing engine

Download: source/binaries
Screenshot:


 * Scans the bitcoin blockchain and retrieves the transactions in each block
 * Checks each bitcoin transaction to see if it contains a mastercoin transaction
 * Parses any mastercoin transactions found and decodes them
 * Writes decoded transactions to a database
 * Processing engine runs through transactions in database checking validity and updating balances etc

Masterchest.info - a block explorer for displaying mastercoin transactions and address balances/history

Download: source/binaries
Screenshot:


 * Independent verification of transactions for the community
 * Lookup address balances and their transaction history
 * Lookup transactions and their validity
 * Display recent mastercoin transactions
 * Unconfirmed transaction support and fast scanning (60-120 secs for a mastercoin transaction to appear)

Masterchest Wallet - a desktop wallet for mastercoin

Download: source/binaries
Screenshot:


 * Clean fresh UI design (attempt to distinguish ourselves from the myriad of bitcoin clones all using the same QT wallet design)
 * Interfaces with bitcoind/qt via RPC
 * Blockchain scanning & mastercoin transaction detection
 * Decoding detected transactions and processing wallet and address balances
 * Multiple address support (automatically picks up all addresses from bitcoind/qt and allows them to be used as source or destination for sends)
 * Multiple currency support (mastercoin, test mastercoin, bitcoin)
 * Send transactions for all supported currencies (multisig for mastercoin, sendtoaddress for bitcoin (though this will move to createraw in future releases))
 * Transaction history
 * Unconfirmed transaction support (both mastercoin and bitcoin)

OTHER CONTRIBUTIONS:
 * Developed an independant implementation of Tachikoma's multisig and successfully verified compatibility against Tachikoma's implementation
 * Work with Tachikoma & JR to define current set of transaction processing rules
 * Helped define perception of total coin supply and define final totals verifying that three seperate implementations (masterchest.info, mastercoin-explorer.com, grazcoins mastercoin-tools) agreed on the final figure of 619478.59338440 MSC
 * Testing of grazcoins CSV output of all exodus generate transactions against masterchest
 * Various rounds of test transactions
 * Testing of Tachikoma's various contributions
 * Contributed to various technical discussions
 * Testing rounds on VMs locating & resolving Masterchest wallet bugs

All contributions are open source for anyone to use as they like

Congratulations and well done to all the other contestants!

Thanks

Code contributions

Mastercoin-ruby: A ruby library to parse MasterCoin data. Source

• Decoda a Mastercoin data-address
• Decode a Mastercoin data-public key
• Encode data to an address
• Encode data to a public key
• Advise how to create a 'old school' transaction using sendmany
• Get the amount of coins bought via Exodus for a given Bitcoin address
• Get the amount of coins bought via Exodus for a given Bitcoin transaction-id
• Decode a Mastercoin transaction based on given Bitcoin transaction-id
• Create and relay a Mastercoin multisig transaction through Bitcoind

Mastercoin-explorer.com: A Ruby on Rails application to index all Mastercoin transactions and show other data. Source.

• Index all Mastercoin related transactions both Exodus payments and simple send transactions.
• Offer a public JSON API so others can easily parse this data without having to index everything themselves. Documentation here.
• Multi-currency support currently has real and test Mastercoins

Mastercoin-wallet: A (QT-based) Mastercoin thin-client implementation. Source

• Uses the forementioned Mastercoin-explorer API to communicatie balance data.
• Only requires a private key with an existing Mastercoin balance to use.
• Saves keys encoded in config files.
• Does not require local Bitcoind/QT.
• Uses multisig approach.

Other contributions

• Come up with multisig approach to replace data-addresses.
• Ported J.R.'s Python script for creating transactions to Mastercoin-Explorer, so people can create transactions without downloading custom software.
• Cross-checked parsing code with implementations by grazcoin and Zathras
• Answered numerous technical questions from other developers on the forums/irc
• Offered an alternative "Selling Mastercoin for Bitcoin spec"

Note: Grazcoin joined forces with Grimentz which is responsible for UI of http://masterchain.info, so voting for Grazcoin includes the part of Grimentz.