Topic: [ANN] 🪙【CoinFlip】 Decentralized Magic Wallet - Smart Contract - Auto payout (Read 739 times)

Another Four days reward sent in Bounty topic.
Due to low interest to our project - we do not have enough enthusiasm to make daily payments, anyway we still make regular payments every 3-4 days.
Welcome for new participants.
With each next member we are closer to results!
More members - more rewards - more rewards - more enthusiasm to reach new levels.
Expecting true players to storm most Fair Coin Flip ever before.

Hello. You will not lose your money, because this smart contract will not accept 10 Matic (and reject payment). Needed to create another smart contract with 10 Matic bet, I can deploy it I nearest days.

If 1 Matic is $0.07 then betting with your smart contract is a waste because each time we place a bet we have to place fees and wait for the next user to place the bet to get our winnings is not cool at all.

Maybe if you change the amount to 10 or 100 matic for each roll it could be more attractive for users.

I was asking myself, what happens if i send an amount different than 0.1 matic? let's say i send 10, would i lose my money?

We see first bet on Polygon. Awaiting for second bet. Third bet - will paid reward for winner between first two players.
https://polygonscan.com/address/0x7196f59B7A17252524Ebb7C75908E452BFf1500E

Now already Five members joined to Bounty with signature campaign here - https://bitcointalksearch.org/topic/bounty-coinflipsignature-campaign-daily-payout-5463217
Together we are more closer to result.

Two members joined to Bounty with signature campaign here - https://bitcointalksearch.org/topic/bounty-coinflipsignature-campaign-daily-payout-5463217
Together we are closer to result.

Fixed in new version Contracts on Polygon
0x7196f59B7A17252524Ebb7C75908E452BFf1500E with Bet 0.1 Matic
0x0a7C520273FF2b37013E844Cd133960Eb31BA52C with Bet 0.2 Matic

BSC
0x8af75e8DE6c766a934871c6ec0733d262fE08089 with Bet 0.01 BNB

Logic changed - now for choosing winner need Timestamp and 9 hashes
So to "Bad" miner needed to control not just timestamp but hashes of 9 blocks, while no bets made, to chose as a winner himself.
also
Source code published https://polygonscan.com/address/0x7196f59b7a17252524ebb7c75908e452bff1500e#code

Found this in Solidity documentation https://docs.soliditylang.org/en/latest/units-and-global-variables.html#block-and-transaction-properties


So seems that was not good idea to chose winner based on Timestamp directly. Seems case when miner do second Bet (when winner choses), set minimal tx fee and includes his transaction onto block with needed timestamp has possibility to exist https://ethereum.stackexchange.com/questions/103205/by-what-duration-can-a-miner-manipulate-block-timestamp

Moreover on Polygon network each next block generated every 2 seconds, and a lot of blocks has a lot of even timestamps in a row, as odd also.

So the logic choosing winner will be changed in next update.

Thanks for audit companies list - will check them and send for audit, when Dev fee will be enough to pay their services.

I can clarify, that exactly thread will be platform for First stage, because all calculations and checks is inside Smart contract made, and block explorer is a transparent database for all transactions made through Contract. So own platform needed just for User Interface in our case and not for manipulations with choosing winner, that's main point, Block timestamp in seconds chose who is winner (As i hope that its fair random number, the only risk I see, that the miners can manipulate with Timestamp, but not sure that is easy). Hope its really unique idea and will be interesting for players.

Bitcoin not need website to use bitcoin as a Smart Contract not requires. Anyway in next stages it can and seems will be, if will be enough attention and interest.

Regarding test discussion: I'm not recognize it as a test, because Contract published on mainnet of Polygon. In same way we all can agree, that all Blockchain projects including Bitcoin is an our Global test... but we using it as value since 2009, until new bugs find to fix the code. Contract code - is simple, but can be not perfect, to fix disadvantages in new versions.

The thing that it has bugs can be also covered from other side with thing, that is too good (and works like a clock), and attracts enough attention to slow down blockchain like it was with some other games. That's why I planning to show source code on next stage, when attention will be enough, or community decides, that is better to publish it earlier, than later.

So this thread is going to be the platform, can you clarify this, I have seen contract-based games and they have their own platform or website for all bets, but this is something unique, I understand that this is still in a test net phase why here why do a test first and when the formula or method is fully established then create an official announcement with all the things needed for members to fully understand the concept, you just created a video and a graph because members have recommended it.

If you want this to be a test discussion you should change the title to Test phase but anyway good luck with your project I include myself calling for an audit of the contract hopefully coming from these auditors
https://www.coingecko.com/learn/11-best-smart-contract-auditing-companies

Contract with higher bet (0.2 Matic) added to Polygon Blockchain (0x26fC3ED19E40a91Ef7257E0ebD3f865241e555dB)
Added into a table it starter post. Future contracts with higher bets will be added into this table.

Right now its not audited, but will be. I propose attract enough attention to its project, test as is at this time, than create other amount of Bets, stress test it and only then publish source code (Because it will be not visible for those, who decide to hack it - this will be next wave for stress test). Anyway is not a principal, I can publish it without stress test, if community will be interest in.

Yes, you can test CoinFlip with test coins. You need to install MetaMask extension (in this video I show how to install it https://y0u.tube/watch?v=sGHf_w5Dhmk ) and need to add there Mumbai Polygon test network, click icon at the end of page, after you install Metamask. Here is contract address on Mumbai testnet: 0x5e2461951ab6caC9738516260405480d5fe6Cc66
You get get free tokens for test here than here
Also need second player, you may invite someone, or I can bet also.
(Is also possible to publish on BSC testnet, if you wish)

I saw there are many other layer networks that are connected with main bitcoin blockchain, not just omni, so maybe you can research more about them.
I think they work very similar like blockchains but I am not expert or developer to explain the difference.

I don't understand and cant read smart contracts, and someone can easily create scam contracts that pay differently.
Did someone audit your smart contract?

So I can test CoinFlip with this test coins?

Hello. As I understand you trust Bitcoin and is ok. Anyway its not possible to create decentralized game on bitcoin blockchain, because its not supported smart contracts (As I know, that Omni network as second layer of Bitcoin supported smart contracts, but I'm not familiar with it at this moment. Let me know if you meant Omni.).

I understand, that double profit sounds like old scams. That Scams controlled by its owner and it was centralized and code can be modified at any moment in most cases it was ponzi. This contract don't, because its not controlled by me after its publishing (Source code will be published after some time! And its simple - its chooses winner between two last transactions and send "double" amount to the winner in next block. There is no scam here) As I wrote in post before contract don't accumulates coins, so even if possibility to scam exist - it exist only for two transactions - then review on forum can be made.

About bigger or smaller bugs. Smart contracts provides for us possibility to make decentralized exchanges between two tokens in one block and this opportunity for creation new decentralized apps, not only coins, but also services need to be in the future! Decentralized exchanges works good enough, and its written on smart contracts. That's why I'm interested in it. My path is to simplify code to minimal, where no place to bug, so this game is first version of this simple code, and even bug will be, it can be fixed and created new contract with these new implementation. Bugs exists everywhere in code, and when it finds we modificate code to a better one - all programs written in such manner. And after some time we got programs like Linux, Bitcoin, what next...?

About test - you really can't test if you don't have Matic or BNB, as I understand its lack of trust to it. But exist testnet with free tokens to try it, its good experience.

If this CoinFlip is not available on bitcoin blockchain than I am not really interested and I cant test it if I dont use coins you mentioned.
Smart contracts always have bigger or smaller bugs and it is possible for someone to exploit them like it happened already for many projects.
There is another thing I dont like when you mentioned to send double amount for better chances, that sounds a lot like old scams that offer to double your bitcoin.

A simple visualization how game process flows.



About how to find Timestamp and to see whole process you may find in this amateur video https://y0u.tube/watch?v=sGHf_w5Dhmk

The video little bit boring, but from myself and quick posted. Hope next videos will become more interactive.

Welcome to watch video https://y0u.tube/watch?v=sGHf_w5Dhmk


Its possible, that you're right. Let's see.

I’m not pertaining to the actual difficulty on how the game work since this just a simple sending of money to smart contract address and wait for the result since payment is automatic due to smart contract. I’m talking about difficulty to find someone here to trust your smart contract for sending their money to money since the project is on early phase.

This is why I suggest for a trial run which involves player here to gain trust of players as you are still on early development phase.