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    Home Unlabelled BTC The Bitcoin Cash Difficulty Adjustment Algorithm is being gamed heavily: Proof, and solution (API)

    BTC The Bitcoin Cash Difficulty Adjustment Algorithm is being gamed heavily: Proof, and solution (API)

    April 13, 2020

    BTC The Bitcoin Cash Difficulty Adjustment Algorithm is being gamed heavily: Proof, and solution (API)

    The Bitcoin Cash Difficulty Adjustment Algorithm is being gamed heavily: Proof, and solution (API)

    Posted: 12 Apr 2020 08:24 PM PDT

    ASICseer mines BCH exclusively with its development fee. In preparation for the BCH halving, we built out an ability to switch between BCH and BTC mining (ultimately, our company must behave profitably). We wanted to go back to BCH mining, but it seemed that BCH profitability was reduced despite supposedly having equalized between the two chains. I started doing some investigation.

    I bought coinwarz API access and started logging BCH difficulty, trying to get some real data in the hopes of building out a switching algorithm for internal use.

    I figured that I'd take the median value of the last 24 hours. If difficulty was below that value, we'd mine BCH. If difficulty was above that value, we'd mine BTC. A few things came to light:

    • I found conclusive proof that the DAA is being gamed.
    • I realized the immediate solution to this problem.

    This screenshot shows that, anytime the difficulty drops to around 60-70% of the median difficulty value over the past day, pools that have both BTC and BCH endpoints ("the cartel") end up finding a disproportionate amount of blocks (as high as 25 blocks per hour) instead of the expected amount of six blocks per hour. In fact, this cartel waits until the lowest possible BCH difficulty to do that.

    So, I began to think: "How can we, as honest miners, prevent this occurrence?" With this question in mind, I built out bchdiff, a JSON API that samples BCH difficulty over the last 24 hours and presents the data in an easily-digestible manner.

    The trigger for is_bch_diff_low is set to return yes when current_divided_by_median is < 0.99 (99%). With this API, you can mine BCH whenever the difficulty starts to recede. With enough people and enough hashrate, use of this API would prevent crazy oscillations, and would remove the profit motive for this pool cartel. The difficulty would never drop to 70% of its median value, and the pool cartel would no longer be incentivized to bring exahashes of BTC hashrate onto the BCH chain.

    Please note: this is not a profit switching algorithm, it is a difficulty switching algorithm. Use of this API will increase your net amount of mined coins/time and will stabilize the BCH chain as a side effect. Profitability never figures into the equation. Finally, and this must be said: If you feel that you're "abandoning" BCH or something equally frivolous, you should not feel that way. I expect you to buy BCH with the BTC that you mine.

    Here is an example (with caching) for instructions on how to use this API. This example showcases the ASICseer Remote Config File system, but you don't need ASICseer to use this API. Basically, you would need to specify your BCH and BTC pool endpoints and switch between them depending on the value of is_bch_diff_low (you can also do your own math if 99% of median is not to your liking). If you are experienced with either solo mining or running a pool, this should be relatively easy to implement.

    EDIT

    To everyone recommending an algorithm switch, please stop. That is not a solution. In 2018, I penned a response to the malicious progPOW attack against Ethereum, and nothing has changed since then:

    https://medium.com/@alex_6580/disclosure-my-name-is-alexander-levin-jr-president-of-gpushack-com-60e5543ef6ef

    Anyone recommending an algorithm switch is naive at best, and malicious at worst. The only thing an algorithm switch will do is incentivize a gigantic conflict of interest and ultimately a full capture of the BCH developers by hardware manufacturers (one, or many). Hardware manufacturers, either covertly or overtly, will simply pay developers huge sums of money to implement their algorithm of choice, and potentially even add a backdoor for them.

    If anyone thinks that it is impossible for open source software to have backdoors, one was just found for ProgPoW last month (after 2 years of speculating that it might).

    submitted by /u/ugtarmas
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    I just beat Phillip Hellmuth for 1st place in the tournament on Blockchain.poker!

    Posted: 12 Apr 2020 02:09 PM PDT

    Bitcoin.com Wallet app is still closed source, months after release

    Posted: 12 Apr 2020 01:43 PM PDT

    With all the links to any kind of source repositories stripped from Bitcoin.com, I believe they have completed their unannounced migration to a closed source development cycle. I see no reason to trust that the code is going to open up for this generation of their wallet. I will be actively discouraging people from using Roger's software going forward, since closed source solutions are all too often bad for users, and he can't be trusted to communicate his intentions with the development of end user financial software. If it opens up again, whose to say it stays that way? He has demonstrated that it will not remain open once before.

    Black boxes controlling your cash is entirely against the foundational reasons for creating a peer to peer trustless currency.

    submitted by /u/ScionoicS
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    Bitcoin.org Owner: Nobody's Buying BTC When They've Lost Their Job or Struggle to Get By

    Posted: 12 Apr 2020 04:19 PM PDT

    The INTENTIONAL differences between Bitcoin Cash and Bitcoin for on chain transactions:

    Posted: 12 Apr 2020 04:54 PM PDT

    Bitcoin Cash

    1. Fast
    2. Cheap to use
    3. Reliable payments

    All of those are enabled by making sure there is always extra room in the blocks for new transactions.

    Bitcoin BTC

    1. Slow
    2. Expensive to use
    3. Unreliable payments

    All of those are enabled by trying to make sure the blocks are always full so there isn't enough room for every new transaction to be included in each block

    This forces the users to bid against each other for the block space. This makes the transactions slower, unreliable, and expensive to use.

    They want everyone to use custodial solutions, or wait a perpetual 18 months for something called lightning network to be ready.

    submitted by /u/MemoryDealers
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    Tutanota Accepts BCH for Donations

    Posted: 13 Apr 2020 01:54 AM PDT

    An open source end to end encrypted email provider is one service I have still not managed to purchase using my BCH and so I have been trying to email both Tutanota and Protonmail in regards to supporting this.

    ​

    Tutanota told me they are currently only working on enabling Bitcoin Core as a payment method for their premium email service however they do currently accept BCH donations. They told me they opened up donations in BCH, BTC, ETH and XMR to gauge demand for these cryptocurrencies amongst their users.

    ​

    The current BCH fund is at just over 0.27 BCH approximately $60 at the time of writing and this is the total that has been received to this address ever.

    In comparison the current BTC fund is at approximately 0.75 BTC, approximately $5000 at the time of writing and has previously been as high as around 1.5 BTC which would have been around $10,000. So I can understand from an outsiders and business point of view why they would opt for BTC support first.

    ​

    Now I personally wasn't aware Tutanota had done way back in the summer of 2018 and so I will be sending a BCH donation shortly. I assume a lot of us were probably not aware of this and so if anyone is interested in this I will leave a couple of links, hopefully we can get them to accept BCH soon and we can add another provider into our BCH ecosystem!

    ​

    I should point out that you can get a free email with Tutanota right now and test them out for yourself.

    ​

    https://tutanota.com/blog/posts/cryptocurrency-support/

    ​

    https://tutanota.com/community#donate

    submitted by /u/Black_Libertarian
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    Weather was good enough to do some casting. This will probably pump the price to $500

    Posted: 12 Apr 2020 02:06 PM PDT

    Corona Lockdown: Is there a "barter x for y site" using BCH as the medium of exchange?

    Posted: 13 Apr 2020 12:02 AM PDT

    Here's the problem: The Corona lockdown rules all seem to limit buying with fiat to the purchase of non-essentials, and of course non-essentials include all sorts of things that the authorities don't think necessary. Like, buying bathroom tile glue to glue that one one loose tile that now u trapped in your home you can take hours to do. Or, like buying seeds for the garden you are now spending many hours in. etc

    Isn't there a barter site where users can deposit BCH, then offer something for barter in return for something they want, where BCH is used as the medium of exchange?

    I can't find it.

    PS: By the way, I'm totally astonished that the BCH community isn't flying with a myriad ideas to solve C19 lockdown problems! Why IS that?? Is everyone with ideas non-tech like me? I would imagine a barter site would be easy peasy. Am I wrong? I can't imagine an environment (lockdown, restrictions on using fiat, supply-chain issues plus plus) that is more conducive to new avenues for BCH use but its not happening. This lack of responsiveness is going a loooong way in informing my understanding of why BCH adoption is so agonizingly slow. Come on people!

    submitted by /u/seedpod02
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    Introducing CASHBOX - Anyone Can Accept BCH To Unlock Anything - Memberships, Pages, Pics, Files - From a Penny to Billions of Dollars with NO PROGRAMMING & NO PERMISSION; Also Foolproof CAPTCHA

    Posted: 12 Apr 2020 02:12 PM PDT

    https://coinster.pro/cashbox

    Screenshots: https://imgur.com/a/pTzsh7D

    Hello! Some know I maintain BitcoinCashForum.online, a sort of repository for community content while adoption grows. I spend lots of time manually filtering accounts from spam because the existing CAPTCHA is weak. I had the idea to improve CAPTCHAs, which have human service farms to bypass, with a foolproof system requiring payment. This hasn't been possible before Bitcoin (Cash) because payments must be small enough to allow legitimate users while discouraging spam. About 1/2 penny seems perfect but fees must be less. CASHBOX now integrates into sites forming a paywall users must pay BCH to move past.

    Spam works because it's a numbers game. Spammers can act millions of time for free. If just 1% is successful they can profit, but that ends when they must pay.

    So I focused on CASHBOX and designed it to promote other Bitcoin Cash advantages. This product exists exclusively for BCH.

    FEATURES:

    • Non-custodial - payments go direct to payee address
    • No coding required - Create CASHBOXs at Coinster then simply use generated HTML
    • Passthrough query parameters, for tighter programmed implementations
    • Virtually Any Amount - Lower limit is 1/4 of 1 penny, and upper limit is $50B
    • Unlock anything - Pay success redirects to any URL, can be standalone hosted filenames or webpages with query parameters unlocking memberships
    • Nearly free, costs just 0.5% in fees

    Example:

    User creates CASHBOX requiring $0.50 which upon success redirects to secret_filename_4716cX8G.JPG where a long filename works as a password. Now without programming anybody can cash lock anything linkable on the web!

    Screenshots: https://imgur.com/a/pTzsh7D

    Coming soon: See CASHBOX in action by signing up on BitcoinCashForum.online. :)

    https://coinster.pro/cashbox

    submitted by /u/cryptos4pz
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    The CashFusion Security Audit has Reached its Fundraising Goal

    Posted: 12 Apr 2020 09:36 AM PDT

    Charges of Fraudulent Pretense: US Court Unseals Onecoin Cofounder's Indictment

    Posted: 12 Apr 2020 05:56 PM PDT

    Safe Haven Asset Update: BTC coin price drops very hard for unknown reasons ��‍♂️

    Posted: 12 Apr 2020 05:53 PM PDT

    “ The biggest investment mistake you can make is to assume [BTC coin] and cryptocurrencies in general are a hedge against the traditional finance system and to naively believe [BTC coin] will negate your losses from recession and stock market collapse."��

    Posted: 12 Apr 2020 05:31 PM PDT

    I'm trying to send my uncle a BCH tip.

    Posted: 12 Apr 2020 03:18 PM PDT

    Sorry if this is so simple, I can move to another forum if necessary.

    But i am trying to send my uncle some bch using gifts.bitcoin.com. When I get to the point where I'm supposed to fund the gift/tip, the electron cash wallet on my phone tells me 

    Supplied CA Not Found In Trusted CA Store

    after scanning the qr code and I can't fund the gift. I'm not totally sure what this means: If my phone is out of date, the website is, the electron cash app is (I recently just updated, on Android), or if I'm doing something else wrong.

    Sorry if this question is kinda basic. Thanks.

    submitted by /u/____candied_yams____
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    There exists this misconception, that the state works for the people

    Posted: 12 Apr 2020 02:59 PM PDT

    Lil Windex - Bitcoin Ca$h Song Passed 1.5 Million Views on YouTube!

    Posted: 12 Apr 2020 08:21 AM PDT

    This app is awesome for adoption!

    Posted: 12 Apr 2020 08:54 AM PDT

    PSA - Reminder: You do not "have" coins on any exchange. Coins on exchanges are not really "yours". Let me give you a good example:

    Posted: 13 Apr 2020 02:03 AM PDT

    Coins held by you on exchanges are not really coins, but "I-Owe-You" notes.

    For example: If I say I give you a Lambo tomorrow, is it the same good as a Lambo standing in your garage right now?

    Obviously not, this is only promise of a Lambo (I-Owe-You-A-Lambo), the same as coins you hold on exchanges, which are promises of coins, which will probably be fulfilled [unless something unexpected happens, like hard crash, bankruptcy, hacking or simple thievery by the owners of the exchange].

    The reason why Bitcoin(Cash) was created - to free you from the need to hire people(banks) to hold your coins for you, like exchanges do now. Exchanges are the new banks.

    submitted by /u/ShadowOfHarbringer
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    Share LC poster to divide 3,500,000 LC!!

    Posted: 13 Apr 2020 01:21 AM PDT

    Share LC poster to divide 3,500,000 LC!!

    For the celebration of $LC launch, CoinEx will hold the following events: Deposit & Trade to Share 26,000,000 $LC

    Share LC poster to divide 3,500,000 LC!! Follow four easy steps on the bottom of the poster !

    Details: https://announcement.coinex.com/hc/en-us/articles/360042210191-LC-Online-Deposit-Trade-to-Share-26-000-000-LC

    https://preview.redd.it/6hdxib0qojs41.jpg?width=1240&format=pjpg&auto=webp&s=7e4a73b300fc087fbf2840db01f496c26d8700de

    submitted by /u/CoinExcom
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    Upcoming Bull Run: 1 MB Blocks vs BCH Scaling - Other Cryptocurrencies Will Boom as BTC Fees Skyrocket! - CONTEST: What Will BTC Fees be During Next Bull Run Peak?

    Posted: 12 Apr 2020 06:25 AM PDT

    "Bitcoin mainchain censors none of these levels, PayPal censors all of them. At what level does the Liquid federation start censoring people?"

    Posted: 12 Apr 2020 12:58 PM PDT

    Amaury Séchet [on the 25 tx chain limit]: “What makes the most sense for BCH, [...] when we produce a block [...], we don‘t do any kind of complicated computation, we just take everything that‘s inside the mempool. Removing that kind of computation removes the needs for the [tx chain] limits.”

    Posted: 12 Apr 2020 03:42 AM PDT

    Roger Ver is donating BCH to The Foundation for Economic Education

    Posted: 12 Apr 2020 04:01 AM PDT

    cash shuffle, cash fusion : excellent idea

    Posted: 12 Apr 2020 07:57 AM PDT

    Thanks for this function in bch.

    Excellent developer !!

    submitted by /u/bluejaytodd
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