Topic: [ANN][GAP] Gapcoin - Prime Gap Search - New Math Algo - CPU / GPU - Zero Premine - page 13. (Read 287896 times)

These older coins usually are.  Devs made their money and moved on or gave up.  You have GAP awards FOR giving merits?  You had 2 guys giving 1 merit each.  Such weak sauce.  I just have the OP 50.  Max allowed in 30 day period.  Not sure if that gets me 51% of the total supply or what.  Thanks. 

I meant - “What did you see that prompted you to enquire whether the devs are MIA/on the clock?”

Cheers

Graham
 

$8.4 billion per last year’s Big Mac index. 

What are you expecting?

Cheers

Graham

Gapcoin community project - Community-led resources for gapcoin ...

- https://github.com/gapcoin-project

Gapcoin Core 0.16.3 Work in progress

- https://github.com/gapcoin-project/gapcoin-core EDIT: N.B. last commit on Dec 10, 2020 !

- https://github.com/gjhiggins/gapcoin-core - N.B. last commit on Mar 14, 2021

Current Release(s) ...

- https://github.com/gapcoin-project/gapcoin/tree/v0.9.3-gap

Are the devs MIA for a long time here or are they on the clock?

 ~ Septoshi

Mod note: consecutive posts merged. hr inserted between posts for clarity

---

"Specifications:
PoW: custom, prime gaps
Block target time 2.5 minutes
Block reward proportional to the current difficulty
Block reward halving every 420000 (about 2 years)
Cap: about 10 - 30 million GAP
Difficulty adjusts every block and increases logarithmically (it will probably take years to get to 50)"

Source code (Original) Line 1184:
- https://github.com/gapcoin/gapcoin/blob/9a2991f83c60a996e351ef73f02b281ee4ee14d0/src/main.cpp#L1184

Excerpt:


...

Bitcoin comparison:
- https://github.com/bitcoin/bitcoin/blob/a0625b8085aa379ac5f7bdca6f2cbf3cbb4a5d0a/src/main.cpp#L1093
and
- https://github.com/bitcoin/bitcoin/blob/c7ad94428ab6f54661d7a5441e1fdd0ebf034903/src/amount.h

---

Tweets from the twittersphere ...

"Hey @CoinMarketCap

How about not holding a proven scientific cryptocurrency project to 'ransom' ...

- https://coinmarketcap.com/currencies/gapcoin/

You stopped tracking the Gapcoin (GAP) price on 8th Feb 2019, despite it still being listed on markets you do track!

- https://gapcoin.club

1/2"
- https://twitter.com/BitcoinFX_XBT/status/1359195500893925376

...

"Gapcoin (GAP) holds the Largest known Prime Gap merit of 41.938784

- https://en.wikipedia.org/wiki/Prime_gap#Numerical_Results

Gapcoin has a unique hashing algo and is CPU mineable, #Bitcoin based not 'Hybrid PoW & PoS or Scrypt'.

You are literally hindering true mathematical discovery.

@CoinMarketCap Face with raised eyebrow

2/2"
- https://twitter.com/BitcoinFX_XBT/status/1359197730787241986

Two places it’s reported: in the original ANN: Cap: about 10 - 30 million GAP and inferrable from the “Outstanding” tab of the chainz Gapcoin block explorer.

Cheers

Graham

does anyone know what the maximum supply of GAPCoins is?    And if I get this data through the wallet console?

You are quoting a post from seven years ago. If you are really interested, look for information at https://gapcoin.club/

Interesting...
Just compiling and waiting....??

Although I provided instructions on how to perform a “depends” build, I failed to include a pointer to the documentation. The concept of a “depends build” is fully detailed in the Bitcoin docs: https://github.com/bitcoin/bitcoin/blob/master/depends/description.md and can be summarised as “a system of building and caching dependencies necessary for building Bitcoin”.

As regards “preserve wallet compatibility with distributed Gapcoin executables”, this basically means - if you have a wallet created by one of the distributed Gapcoin binaries, then it'll have been created by BerkeleyDB 4.8 (as an outcome of performing a “depends build”) and that file will contain a BerkeleyDB 4.8 database in loadable binary form.

(Aside: if you install the Ubuntu 20 package db5.3-util, you'll have access to a small clutch of db5_* routines, one of which is db5_stat, you can navigate to your datadir and run “db5_stat -f wallet.dat” and view the statistics for the database.)

The version difference can impact the user in a couple of ways.

1. The client automatically upgrades its wallet.dat to whatever version of libdb the client was linked against. So, if you use a binary linked against libdb5.3, the wallet.dat file will get upgraded to the 5.3 format. If you then use that wallet with a client linked against libdb4.8, the client may not be able to successfully load the upgraded-to-db5.3-wallet.

2. Distributed binaries use libdb4.8 by default, so a wallet.db created/upgraded by a self-compiled client linked against libdb5.3 may not be copyable across platforms.

Generally, if you exclusively use a modern Linux distro and have no need to copy wallets to clients running on Windows/OS X that have been linked against libdb4.8,  there's no other reason not to take advantage of the improvements in speed/reliability between libdb4.8 and libdb5.3. Just use the --with-incompatible-bdb option to configure and the client will be linked against the latest version of BerkeleyDB provided by your distro.

OTOH, if you do need to “preserve wallet compatibility with distributed Gapcoin executables”, then you will need to link your client against libdb4.8. This can be achieved in a couple of ways:

1. Use a "depends build" as detailed in the depends/README.md.

(It's worth bearing in mind that the latest Bitcoin docs are more up-to-date than the now-ageing Gapcoin 0.16.3 docs and more properly reflect changes in the ecosystem since Feb 2018 - for example, note the removal of the Ubuntu ppa reference from the latest Bitcoin docs vs the old 0.16 docs)

2. Use the install_db4.sh shell script to download and compile the BerkeleyDB 4.8 sources then configure their use in the compilation. (There is one from back in 2018 in the Gapcoin contrib folder but it's better to use the more recent version from the Bitcoin repos. I found I needed to add a line chown -R u+w * immediately after LoC#68)

If I need to build a Gapcoin client linked against libdb4.8, I just use the recommended default: ./install_db4.sh `pwd`. It creates a db4 directory in contrib which I can then use when running configure:

This will give me a client linked against the latest boost, ssl and Qt libs etc whilst retaining compatibility with libdb4.8 wallet files, should I need it.

Cheers

Graham

Mod note: consecutive posts merged

---

Infinite monkey theorem ...
- https://en.wikipedia.org/wiki/Infinite_monkey_theorem

...

relevant papers ...
- https://github.com/gapcoin-project/gapcoin/tree/v0.9.4-gap/contrib/gapcoin

j0nn9-about-prime-gaps.md
- https://github.com/gapcoin-project/gapcoin/blob/v0.9.4-gap/contrib/gapcoin/j0nn9-about-prime-gaps.md

...

Times of Malta
Prime numbers and cryptography - 10 March 2018 | Alexander Farrugia
- https://timesofmalta.com/articles/view/Prime-numbers-and-cryptography.672957

Excerpt: "A prime gap is the difference between two successive prime numbers. For example, the numbers 317 and 331 are both prime, but no number in between is prime, so we have a prime gap of 14. By the Prime Number Theorem, the average prime gap between any two consecutive prime numbers among the first n whole numbers is the natural logarithm of n. The merit of a prime gap is thus defined as the prime gap divided by this average prime gap. For example, the merit of the prime gap between 317 and 331 is 2.43, which means that this prime gap is more than twice the average prime gap among those between 1 and 317. In December 2017, the GapCoin network discovered a prime gap of length 8350 following an 87-digit prime. This prime gap has merit 41.94, which means that it is almost 42 times as large as the average prime gap. This is the largest prime gap merit discovered to date."

...

Somehow I missed this article ... better late than never!




Interesting enough it would appear that the (backwards) incompatibility with building Berkeley db-4.8.30 on Ubuntu 20.04 and 20.10 as per ...

- https://bitcointalksearch.org/topic/m.54524230

would be GCC 9 and replacing it (if only temporarily with g++-7 ) allows for Berkeley db-4.8.30 to be built on Ubuntu 20.04 and 20.10 .

Gapcoin Core v0.16.3 will therefore build without depends with Berkeley db-4.8.30 (not advisable!) ...


Revert to GCC 9 after compiling (optional) ...



N.B. Gapcoin v0.9.3 or v0.9.4 will not build on Ubuntu 20.04 and 20.10 easily or without compiling older boost packages etc., (again, not advisable!)

...

Current advisory is to continue running Gapcoin v0.9.3 or v0.9.4 on Ubuntu 18.04 (where possible) whilst the repositories (guides and builds) are brought up to scratch and 'officially' released.

Onward.

It's going to be amazingly amazing ...

- https://en.wikipedia.org/wiki/Prime_gap#Numerical_Results

"38.047893    35308    404    100054841 × 953#/210 − 9670    2020    Seth Troisi"

Combined Sieve Algorithm for Prime Gaps
- http://arxiv.org/pdf/2012.03771v1
11/30/2020 ∙ by Seth Troisi, et al.
- https://deepai.org/publication/combined-sieve-algorithm-for-prime-gaps
Excerpts:
"A new Combined Sieve algorithm is presented with cost proportional to the number of enumerated factors over a series of intervals. This algorithm achieves a significant speedup, over a traditional sieve, when handling many ([10^4, 10^7]) intervals concurrently. The speedup comes from a space-time tradeoff and a novel solution to a modular equation. In real world tests, this new algorithm regularly runs 10,000x faster. This faster sieve paired with higher sieving limits eliminates more composites and accelerates the search for large prime gaps by 30-70 algorithm, two top-10 record merit prime gaps were discovered."

...

"[2] Graham Higgins. Prime gap list. GitHub repository. https://primegap-list-project.github.io/lists/top20-overall-merits/ , https://github.com/primegap-list-project/prime-gap-list. 2020 ."

...

"[6] Graham Higgins. Exhaustively analyzed gaps. GitHub repository. https://primegap-list-project.github.io/fully-analyzed/ . 2020"

---

- https://github.com/sethtroisi?tab=repositories ...

Combined Sieve - a new program to find prime gaps.
- https://github.com/sethtroisi/prime-gap

Recovery and curation of Dr. Thomas Ray Nicely’s list of first known occurrence prime gaps
- https://github.com/primegap-list-project/prime-gap-list

Prime Gap Verify
- https://github.com/sethtroisi/prime-gap-verify

It isn't all that difficult --- with the correct instructions (sorry, my bad) --- as BitcoinFx notes, I omitted the git submodule section that includes the PoWCore code.

Cheers

Graham

It isn't that difficult to get the Gapcoin wallet compiled.

I personally have not yet tested Ubuntu 20.10 or 20.04 LTS

I know Gapcoin runs perfectly well on Ubuntu 18.04 LTS desktop and it will also be tested to run on the above.

...

Looks to me like you have not pulled and updated the submodule for the PoWCore ? See:

- https://bitcointalksearch.org/topic/m.54524230

...

git submodule init

git submodule update

?

---

Untested Build Example; HERE BE DRAGONS !!!

(N.B.

rm -rv gapcoin

to delete the current directory and to start a fresh build!) ...


Terminal window (ctrl + alt + t) - copy and paste:

sudo apt-get update && sudo apt-get dist-upgrade

sudo apt-get install build-essential libtool autotools-dev autoconf automake pkg-config libssl-dev libevent-dev libboost-all-dev bsdmainutils libgmp-dev libmpfr-dev


Qt 5 Install:

sudo apt-get install git libqt5gui5 libqt5core5a libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev protobuf-compiler


Berkeley DB ('default' OS version):

sudo apt-get install libdb-dev libdb++-dev


IMPORTANT: Always backup your wallet.dat and your private keys!


See:
- https://github.com/bitcoin/bitcoin/issues/3686#issuecomment-74836708
- https://github.com/bitcoin/bitcoin/blob/master/doc/build-unix.md#ubuntu--debian


...

Gapcoin-QT, gapcoind and gapcoin-cli download and compile (example): for Ubuntu 20.10 or 20.04 LTS ... TESTNET only.


git clone --branch v0.9.3-gap https://github.com/gapcoin-project/gapcoin.git EDIT: No Depends Build for v0.9.2 - v0.9.4 series.

N.B. This is for Gapcoin Core v0.16.3 - TESTNET only - Work in progress ... v0.9.3 or v0.9.4 is the current release!

Again, HERE BE DRAGONS !!!

EDIT:

git clone https://github.com/gapcoin-project/gapcoin-core.git - Gapcoin Core 0.16.3 Work in progress last commit on Dec 10, 2020 !

Gapcoin Core 0.16.3 Work in progress last commit on Mar 14, 2021 ...

git clone https://github.com/gjhiggins/gapcoin-core

cd gapcoin-core

git submodule init

git submodule update


Depends Build:

cd depends

make NO_UPNP=1

cd ..

./autogen.sh

./configure --prefix=$PWD/depends/x86_64-pc-linux-gnu --with-gui=qt5 --without-miniupnpc --disable-tests

make

make install


Strip gapcoind and gapcoin-cli:

cd src

strip gapcoind

strip gapcoin-cli

strip gapcoin-tx


Strip gapcoin-qt:

cd qt

strip gapcoin-qt

cd


...

Running gapcoin-qt:

Terminal window (ctrl + alt + t) - copy and paste:

cd gapcoin-core/src/qt

./gapcoin-qt

...

Hi Graham, i tried option 1
and got
cd depends
make HOST=x86_64-linux-gnu
cd ..
./autogen.sh
CONFIG_SITE=$PWD/depends/x86_64-linux-gnu/share/config.site ./configure --prefix=/
make
Making all in src
make[1]: Entering directory '/home/jase1/Downloads/gapcoin-core/src'
make[2]: Entering directory '/home/jase1/Downloads/gapcoin-core/src'
  CXX      libbitcoinconsensus_la-arith_uint256.lo
  CXX      libbitcoinconsensus_la-hash.lo
  CXX      libbitcoinconsensus_la-pubkey.lo
  CXX      libbitcoinconsensus_la-uint256.lo
  CXX      libbitcoinconsensus_la-utilstrencodings.lo
  CXX      gapcoind-bitcoind.o
  CXX      libbitcoin_server_a-addrdb.o
make[3]: Entering directory '/home/jase1/Downloads/gapcoin-core/src/secp256k1'
gcc -I. -g -O2 -Wall -Wextra -Wno-unused-function -c src/gen_context.c -o gen_context.o
  CXX      libbitcoin_server_a-addrman.o
  CXX      libbitcoin_server_a-bloom.o
  CXX      libbitcoin_server_a-blockencodings.o
  CXX      libbitcoin_server_a-chain.o
In file included from ./chain.h:12:0,
                 from chain.cpp:8:
./pow.h:11:29: fatal error: PoWCore/src/PoW.h: No such file or directory
compilation terminated.

TBH, i started @ 7.30am with LM20.1, (my fault), then rebuild hard drive with clean LM20.04 for a few attempts, finally started afresh with LM18.3, and now @14.50pm, still have no wallet, so i give in

I must stress, i completely appreciate the efforts yourself and many other programmers on here put in, but when i read
"If you need to preserve wallet compatibility with distributed Gapcoin executables, then do a "depends" build",  i'm sat here thinking, i don't even know what that means, nevermind knowing if i should worry about it....

It really should not be this difficult to start with a clean drive, install LM or Ubuntu and get a fresh wallet running...

This ^

Thanks Graham!

and for only gapcoind and gapcoin-cli (without QT/GUI and UPNP) ...

Example;


--with-incompatible-bdb

etc.,

There are two main ways to proceed.

If you need to preserve wallet compatibility with distributed Gapcoin executables, then do a "depends" build, following the instructions in depends/README.md, using HOST=x86_64-linux-gnu, i.e:

Otherwise, if you're just building for yourself, use sudo apt install libdb-dev libdb++-dev and add --with-incompatible-bdb to the options to configure.

Cheers

Graham

Hey minerja,

Remember that we are very much between historical Bitcoin builds in terms of Gapcoin releases at the moment.

Running Gapcoin and mining on Ubuntu 18.04 LTS would currently be my recommendation.

However, I will get around to testing / adding updated build instructions for Ubuntu 20.

Have you tried building the Berkley DB for yourself ?

- https://bitcointalksearch.org/topic/m.54524230

Bear in mind that the current repos might need fixes for Ubuntu 20.10

sudo apt-get install libdb-dev
sudo apt-get install libdb++-dev

The above will install the current Berkley DB for your OS (a higher / incompatible version e.g. BerkeleyDB 5.1 or later), so be careful and ...

Always backup your wallet.dat and your private keys!