Found this: Denny's Lotto: Ethereum ÐApp demo & walkthrough

Started by cass, April 17, 2014, 01:54:10 AM

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bytemaster

#13
April 18, 2014, 04:38:33 PM
Quote from: gamey on April 18, 2014, 06:02:27 AM
Quote from: HackFisher on April 18, 2014, 05:58:20 AM
Quote from: bytemaster on April 18, 2014, 05:18:19 AM
How did they solve the RNG problem?

https://github.com/dennismckinnon/Ethereum-Contracts/blob/master/Dennys%20Lotto/Lottery.lsp

Code Select

[0x20] (prevhash)
[0x40] (coinbase)
[0x60] (SHA3 0x20 0x40) ;Random lottery
[0x80] (MOD @0x3 @@0x2) ;DRAW!


From explanation of the demo and code, it seems being use hash of (block info  and prevhash) to resolve the RNG.

I've enclosed this thread's link to Dennis, he perhaps can give more info on that if he come here.

I listened to his youtube on and off.   What I recall is that the "forum" thought hashing the block timestamp was a good idea, but Denny was against that. (for good reason..  the time stamp can be selected within a certain window.)  So he ended up using previous block + current block hashes.

This design only works because ethereum is mining based and thus it is difficult to produce a winning block in the first place. 
For the latest updates checkout my blog: [url="http://bytemaster.bitshares.org"]http://bytemaster.bitshares.org[/url]
Anything said on these forums does not constitute an intent to create a legal obligation or contract between myself and anyone else.   These are merely my opinions and I reserve the right to change them at any time.

gamey

#12
April 18, 2014, 06:02:27 AM
Quote from: HackFisher on April 18, 2014, 05:58:20 AM
Quote from: bytemaster on April 18, 2014, 05:18:19 AM
How did they solve the RNG problem?

https://github.com/dennismckinnon/Ethereum-Contracts/blob/master/Dennys%20Lotto/Lottery.lsp

Code Select

[0x20] (prevhash)
[0x40] (coinbase)
[0x60] (SHA3 0x20 0x40) ;Random lottery
[0x80] (MOD @0x3 @@0x2) ;DRAW!


From explanation of the demo and code, it seems being use hash of (block info  and prevhash) to resolve the RNG.

I've enclosed this thread's link to Dennis, he perhaps can give more info on that if he come here.

I listened to his youtube on and off.   What I recall is that the "forum" thought hashing the block timestamp was a good idea, but Denny was against that. (for good reason..  the time stamp can be selected within a certain window.)  So he ended up using previous block + current block hashes.
I speak for myself and only myself.

HackFisher

#11
April 18, 2014, 05:58:20 AM
Quote from: bytemaster on April 18, 2014, 05:18:19 AM
How did they solve the RNG problem?

https://github.com/dennismckinnon/Ethereum-Contracts/blob/master/Dennys%20Lotto/Lottery.lsp

Code Select

[0x20] (prevhash)
[0x40] (coinbase)
[0x60] (SHA3 0x20 0x40) ;Random lottery
[0x80] (MOD @0x3 @@0x2) ;DRAW!


From explanation of the demo and code, it seems being use hash of (block info  and prevhash) to resolve the RNG.

I've enclosed this thread's link to Dennis, he perhaps can give more info on that if he come here.
Anything said on these forums does not constitute an intent to create a legal obligation or contract between myself and anyone else.   These are merely my opinions and I reserve the right to change them at any time.

bytemaster

#10
April 18, 2014, 05:18:19 AM
How did they solve the RNG problem?
For the latest updates checkout my blog: [url="http://bytemaster.bitshares.org"]http://bytemaster.bitshares.org[/url]
Anything said on these forums does not constitute an intent to create a legal obligation or contract between myself and anyone else.   These are merely my opinions and I reserve the right to change them at any time.

HackFisher

#9
April 18, 2014, 02:32:04 AM
Quote from: toast on April 17, 2014, 03:18:33 PM
Contact them!

Sent from my SCH-I535 using Tapatalk

Contacted, it would be great if we can collaborate.
Anything said on these forums does not constitute an intent to create a legal obligation or contract between myself and anyone else.   These are merely my opinions and I reserve the right to change them at any time.

toast

#8
April 17, 2014, 03:18:33 PM
Contact them!

Sent from my SCH-I535 using Tapatalk

Do not use this post as information for making any important decisions. The only agreements I ever make are informal and non-binding. Take the same precautions as when dealing with a compromised account, scammer, sockpuppet, etc.

HackFisher

#7
April 17, 2014, 03:16:48 PM
interesting... I just watched that, good demo.

similar features, so facing similar problems to resolve, e.g. the part to RNG...

I like this Dennis' humor:)
Anything said on these forums does not constitute an intent to create a legal obligation or contract between myself and anyone else.   These are merely my opinions and I reserve the right to change them at any time.

CLains

#6
April 17, 2014, 01:45:58 PM
Working on the same kind of thing and having the same name is a great point of entry. Destined for collaboration I say. :)
Vote for BitSpace EOS Block Producer!

[url="https://steemit.com/eos/@bitspace/bitspace-eos-block-producer-candidate"]https://steemit.com/eos/@bitspace/bitspace-eos-block-producer-candidate[/url]

cass

#5
April 17, 2014, 02:21:08 AM
Quote from: HackFisher on April 17, 2014, 02:19:25 AM
I cannot access youtube temporarily, what's is about, is another "Denny" from Ethereum giving a demo?

I'll watch that later...

yay don't know it it important, but guessing from bytes reply it isn't ^^^just want to let you know about...
█║▌║║█  - - -  The quieter you become, the more you are able to hear  - - -  █║▌║║█

HackFisher

#4
April 17, 2014, 02:19:25 AM
I cannot access youtube temporarily, what's is about, is another "Denny" from Ethereum giving a demo?

I'll watch that later...
Anything said on these forums does not constitute an intent to create a legal obligation or contract between myself and anyone else.   These are merely my opinions and I reserve the right to change them at any time.

cass

#3
April 17, 2014, 02:06:00 AM
Quote from: bytemaster on April 17, 2014, 02:02:17 AM
Funny that HackFisher's name is Denny and he is working on our Lotto...

^^
█║▌║║█  - - -  The quieter you become, the more you are able to hear  - - -  █║▌║║█

bytemaster

#2
April 17, 2014, 02:02:17 AM
Funny that HackFisher's name is Denny and he is working on our Lotto...
For the latest updates checkout my blog: [url="http://bytemaster.bitshares.org"]http://bytemaster.bitshares.org[/url]
Anything said on these forums does not constitute an intent to create a legal obligation or contract between myself and anyone else.   These are merely my opinions and I reserve the right to change them at any time.

cass

#1
April 17, 2014, 01:54:10 AM
https://www.youtube.com/watch?v=ldJcw7JPHz0&feature=youtu.be

FYI don't know if i post it here correctly, but want to publish this link.
What do you think?
█║▌║║█  - - -  The quieter you become, the more you are able to hear  - - -  █║▌║║█
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