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Author Topic: [ANN] 🌀 Blur Network (BLUR) 🌀 - PoW Cryptonight-Dynamic || Solo-Mine/CPU-Only  (Read 12267 times)
blurnetwork
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July 01, 2018, 12:01:31 PM
Last edit: December 24, 2018, 09:18:51 AM by blurnetwork
Merited by thang long (1)
 #1


The Blur Network (BLUR)
Download the Latest release, Blur v0.1.8.2 'Shift' on our Github releases page.  This release included bug fixes and improvements, which you will find enumerated on the releases page, as well.  

The Blur Network is expanding to a multi-chain model! You can read about where things are headed here.

We are also holding a rolling-basis weekly AMA on our subreddit.  Questions may be asked throughout each week, and will be answered in batches each Saturday that follows.  Please feel free to ask any questions you may have about the new multi-chain framework or the future of BLUR in that thread.  Follow the link above for details and scope.






BLUR is a private cryptocurrency that is GPU/ASIC-resistant. Blur features a custom rework of the Cryptonight algorithm, that we are calling Cryptonight-Dynamic.  The algorithm incorporates aspects of CryptoNight-Adaptive v1 (from NERVA), CryptoNight Variant 2 (from Monero), and CryptoNight Light (from Aeon) and is designed to change once every second.  The use of a block timestamp helps mitigate the problem timestamp manipulation, and the merge mining is disabled to insulate against NiceHash-style on-off mining attacks.   The decentralized-by-design approach of Blur allows only for CPU-mining on a full node.  Transaction amounts and participants are obfuscated using the CryptoNote Protocol.

Command-Line Interface Tools/Wallets:



Graphical User Interface Wallets:


Quick Links:
Website: Blur Network - The Private Cryptocurrency
Block Explorer: Blur Network Block Explorer
Network API:Explorer JSON-API
Source Code: Github Source
Official Subreddit:Blur Network on Reddit
Twitter:Follow The Blur Network
Discord:Official Discord Server(Preferred Contact Method for Blur Network)
Telegram:Official Telegram Chat
Roadmap:Blur Network Roadmap





Exchanges:

You Can Now Trade Blur on Bisq!:



Getting Started with Bisq:

Click here for a PDF guide on how to trade BLUR on Bisq



Coin Metrics:
Total Supply: 9,223,300 BLUR ( + Tail Emission of 2.0 BLUR/block )
Pre-Mine: 360,000 = 3.9% of Supply
Algorithm: Custom Cryptonight-Dynamic ( CPU-only | GPU/ASIC-resistant )
Block Time: Target = 60 seconds
Block Reward: Decreasing from 7.0 BLUR per block currently
Decimal Places: Twelve ( 12 )
Emission Profile: Blur Network Emission Spreadsheet


Seed Nodes:
Node 1: 66.70.188.178
Node 2: 66.70.189.131
Node 3: 66.70.189.183
Ports: P2P= 13894 | RPC = 13895









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July 01, 2018, 12:03:28 PM
 #2

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blurnetwork
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July 01, 2018, 12:10:51 PM
Last edit: January 09, 2019, 02:24:08 PM by blurnetwork
 #3

CNAv1 is known to be vulnerable to pool-creation with some simple mods. That being the case, does Blur intend to fight against pools or to embrace them and keep the GPU resistance?


Pool resistance was not the objective with the algorithm changes... more so, a welcomed byproduct of them.  Pooled hashing is something that will become a part of the project further down the line, with a limit on poolsize based on % of net hash.  This achieves the goal of decentralization without exposing miners to the unbalanced "luck" of solving for the correct block hash ... Although, luck and randomness are *technically* more fair.

As someone who is not intimately familiar with how the cn-Adaptive algo works, would you be able to give a simplified explanation of how the algo manages to be GPU and pool resistant?

Definitely.  It's really not all that complex, to be honest. Explaining it can be, though.   NERVA's implementation currently adds a few more layers for randomness.  We'll be adding some of that on our own in the next network update which should be this week sometime.  Essentially, the algorithm runs a base number of iterations in the cryptonote algorithm... then dynamically adds an additional number of iterations (which differs each block) to that base number.  That dynamic portion is based on the previous block's height.  The way it is written, the iterations in a block cycles up and then back down to make a pattern of difficulty that looks like a sawtooth. 



if you notice hashrate gradually increasing, before dropping sharply, and then repeating the cycle... this is why.

There are two files that hold the algorithm's nuts and bolts, as they are present in BLUR's algorithm currently. These two files that we are going to look at, are located at the following locations in the source code:

Code:
blur/src/crypto/slow-hash.c
and
Code:
blur/src/cryptonote_basic/cryptonote_format_utils.cpp

The slow-hash.c file has a few pieces of information that are important and differentiate CN-Adaptive from other variants of cryptonight.  The first of which is on line 46:
Code:
#define MEMORY         (1 << 20) // 1MB scratchpad

As annotated, this parameter defines the scratchpad size for the algorithm's rounds of iterations. A 1MB scratchpad is also seen in Cryptonight-Light.  This size allows for less iterations in a round, and fits within the cache of lower end CPUs, enabling older hardware to still mine somewhat effectively. 

Now within the cryptonight algorithm, there is an added parameter in CN-Adaptive, for iterations.  This parameter defined as iters, and you can find the implementation on Line 570 of the same slow-hash.c file:

Code:
void cn_slow_hash(const void *data, size_t length, char *hash, int variant, int prehashed, size_t iters)

As well as lines 645-662:

Code:
    if(useAes)
    {
        for(i = 0; i < iters; i++)
        {
            pre_aes();
            _c = _mm_aesenc_si128(_c, _a);
            post_aes();
        }
    }
    else
    {
        for(i = 0; i < iters; i++)
        {
            pre_aes();
            aesb_single_round((uint8_t *) &_c, (uint8_t *) &_c, (uint8_t *) &_a);
            post_aes();
        }
    }

This variable "iters" calls out to a function in the second file I mentioned, to determine its value in the block being mined.   So head over to blur/src/cryptonote_basic/cryptonote_format_utils.cpp if you're following along. 

Within that file, on lines 891-901, you'll find the calculations for the number of iterations.  Before elaborating on the code, I would like to note that in its current state this code could be optimized with a GPU.   However, you  would still need a CPU present in some form, to direct the GPUs hashpower.  BLUR's goal is being too resource intensive for GPU/ASIC miners to pursue.  In its current state, and at the current value of BLUR... this has sufficed.  However, we are hardforking to a new implementation shortly, for the purpose of maintaining that as the project grows.

With that said, on lines 891-901 of cryptonote_format_utils.cpp we have:

Code:
  //---------------------------------------------------------------
  bool get_block_longhash(const block& b, crypto::hash& res, uint64_t height)
  {
    blobdata bd = get_block_hashing_blob(b);
    int cn_variant = b.major_version >= 5 ? 1 : 0;
int cn_iters = b.major_version >= 6 ? ( b.major_version >= 7 ? 0x40000 : 0x20000 ) : 0x80000;
    cn_iters += ((height + 1) % 1024);
    crypto::cn_slow_hash(bd.data(), bd.size(), res, cn_variant, cn_iters);
    return true;
  }
  //---------------------------------------------------------------

The lines here that we are primarily looking at, are the ones that declare and calculate the variable "cn_iters". Starting with the first mention (where we calculate the base number of iterations):

Code:
int cn_iters = b.major_version >= 6 ? ( b.major_version >= 7 ? 0x40000 : 0x20000 ) : 0x80000;

The code above breaks down into two parts...

Code:
b.major_version >= 6 ? (x) : (0x80000)
and
Code:
b.major_version >= 7 ? (0x40000) : (0x20000)

The "x" variable in the first part, is simply swapped out for the entire "second part" in the actual code.  For the purposes of explaining, its easier to break it apart this way.  The "?" symbol in C++ is what's known as a ternary operator. It essentially serves as an "if" statement directed by the ">=" operators that come before it, in this instance.

So it means to say "If the block version number (hardfork version) is greater-than-or-equal-to 6, define the iterations as the value on the left-hand side of the colon.  If it is not, define as 0x80000 or the value following the colon. 

The number 0x80000 is in hexidecimal, and translates to the human-readable number (in decimal format) 524288, for our base # of iterations.  Assuming we are above block version 5... we then move to the next conditional statement
Code:
b.major_version >= 7 ? (0x40000) : (0x20000)


We use the same logic here, to say if we are on block version 7 or higher, we use 0x40000 or 262144 for the base amount of iterations.  If we are not (i.e. less than 7 but greater than 5), we use 0x20000 or 131072 for the base number.  Now, ONTO THE DYNAMIC PART.  That's much simpler:

So far we have iterations (for current hardfork) = 262144 + (dynamic portion). The dynamic part is found on line #897, directly after the calculation for the base number:

Code:
cn_iters =+ ((height +1) % 1024)

This means to say: "Add to the base number of iterations, the calculated value for the function (current block height) Modulo (1024).  A modulo just means divide the height by 1024, and look at your remainder.  That remainder is actually then the solution to the equation.  So, (1025) % 1024 would equal 1. Just the same, (2047) % 1024 would equal 1023, because 2047 = 1024 + 1023...


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July 01, 2018, 12:29:36 PM
Last edit: October 25, 2018, 10:24:36 PM by blurnetwork
 #4

Don't understand the definition of this coin, can you introduce it easily and plainly? And, by the way, why did you choose such a name for your coin? Thanks in advance

The goal of Blur Network is accessibility for anyone interested in preserving their privacy.  Far too many projects now rely on special-interest groups with specialized hardware, solely, for the security of the network.  Our efforts center upon enabling anyone with a computer to contribute significantly enough to the network hashrate, to have a fair probability of mining a block, independently... not just those with a kickass GPU or enough spare change to buy a couple dedicated mining rigs.    

BLUR aims to be accessible to nearly anyone with a computer, enabling them to stand and join the fight for financial freedom. It's time to dispell the idea that privacy coins are primarily for illicit use... Privacy is a choice, and it will be a fight.

You send someone money with a debit card or money transfer — do you want them seeing your bank balance? That information is readily available to the other party (and the rest of the world) when you send anyone Bitcoin. We’ve become dangerously comfortable with trusting our personal information to be known by others. Often, this is disguised as a means to "protect" your assets.  But, it comes at a steep cost.  Suppose you're someone who would like their financials, online habits, or any piece of their digital footprint to stay private? Who do you trust with that privacy?  Do they really have your interests in mind?

We’re completely dependent on companies and institutions who have zero regard for these aspects of our financial reality. A change starts with establishing exactly where we need transparency and privacy, respectively.  Change continues only by making it easier to align ourselves with that stance, and supporting our own security and privacy, not entrusting it to others. This is where Blur becomes very useful...

The name was chosen to depict the network, in concept.  The idea of obfuscating balances and transaction participants, while embedded in a selectively-transparent system, sounded... blurry. The ledger is made obscure to those who may attempt to spy on others' transactions.  Still, it remains transparent to the parties needing verification of amounts sent, received, etc.  Crystal clear, and frustratingly murky.... In just the right spots.

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July 01, 2018, 12:35:39 PM
 #5

res
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July 01, 2018, 12:47:49 PM
 #6

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July 01, 2018, 12:49:22 PM
 #7

Need Pool + Link to Miner

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July 01, 2018, 01:17:00 PM
 #8

reserved
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July 01, 2018, 01:27:31 PM
 #9

Hm, what's the novel thing here? We already got a lot of CPU-only coins lately, snowblossom, Deft...

Any real-world usecase you are targeting that would make the coin interesting to non-miners to buy and hold?
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July 01, 2018, 01:31:31 PM
 #10

Hm, what's the novel thing here? We already got a lot of CPU-only coins lately, snowblossom, Deft...

Any real-world usecase you are targeting that would make the coin interesting to non-miners to buy and hold?

This is a cpu-only variant of the cryptonight algorithm.  RingCT signatures on a cpu-only coin are only implemented by NERVA, aside from this project.  Cryptonote coins lack that aspect of design, otherwise.
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July 01, 2018, 01:44:10 PM
 #11

res
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July 01, 2018, 01:57:27 PM
 #12

RESERVED
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July 01, 2018, 02:37:54 PM
 #13

res
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July 01, 2018, 02:41:59 PM
 #14

It's good to know that this coin is mine able using CPU.
But one question, will it disturb the usage performance on the computer while the mining process is working?

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blurnetwork
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July 01, 2018, 05:29:04 PM
 #15

resoived
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July 01, 2018, 05:35:13 PM
 #16

Good! I quite like the coin that can resist GPU and ASIC. Because that can bring a fair amount of justice to the user (if there is no ICO).
Low supply is also a strong point of BLUR, only exploited through CPU with low supply will guarantee value for BLUR.
I will be involved in exploiting with 3 CPUs on different computers.
Wish you success-BLUR!
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July 01, 2018, 07:30:21 PM
 #17

Here you go for the Dutch translation:
https://bitcointalk.org/index.php?topic=4579588

My address:
bL49dzHNctMGLbtMYmqSPBFPHhbMhY9Rg6YMTDt9acwxDbRqxRDw8VnG7j6NG75B4F1KT9bpqbSJt1e uFRqQzYLU1fvK6QuLd

◼◼ The Future of Payroll
◼ Make Every Day Payday (http://workchain.io)
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July 01, 2018, 11:42:14 PM
 #18

reserved
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July 01, 2018, 11:54:28 PM
 #19

Good! I quite like the coin that can resist GPU and ASIC. Because that can bring a fair amount of justice to the user (if there is no ICO).
Low supply is also a strong point of BLUR, only exploited through CPU with low supply will guarantee value for BLUR.
I will be involved in exploiting with 3 CPUs on different computers.
Wish you success-BLUR!

Hoping that the team will not be discouraged in developing this coin til it's already stable. Most of the projects are abandoned after quite some time. If the team is ready for the crypto battle, then, this might be of something as the supply is quite low.

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July 02, 2018, 12:27:24 AM
 #20

reserved
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