Version 1.6.2 Released. Download links for Windows Client and source in github are updated. To save your time and resources the separate link for blockchain data is provided in downloads section.



Please vote Graincoin for being added to exchanges:
For cryptsy:
https://cryptsy.freshdesk.com/support/discussions/topics/44936




A grain is a unit of measurement of mass that is nominally based upon the mass of a single seed of a cereal. From the Bronze Age into the Renaissance the average masses of wheat and barley grains were part of the legal definition of units of mass. However, there is no evidence of any country ever having used actual seeds or cereal grains. Rather, expressions such as "thirty-two grains of wheat, taken from the middle of the ear" appear to have been ritualistic formulas, essentially the premodern equivalent of legal boilerplate.

- from Wikipedia



Graincoin (GRA)

Graincoin is a PoW/PoS coin that is designed to be the unit of cyber-coin. It has a total of 50 billion unit to be released, through a fair p2p mining process. It is fast, secure and have sufficient coins for circulation so it can be used in real daily shopping.

Graincoin is from the family of PPCoin/Novacoin with latest available algorithms that fixed various problems in the PoW/PoS coins. As compared to the PoW only coins, the proof of stake coins are more resilient to 51% attack. Also it is a long term energy-efficient crypto-currency since not all coins are obtained by mining.

Each graincoin block provides random 1024 - 2048 grains initially. It also provides rare superblocks. The coin uses hash-based algorithm to determine superblocks based on the number of 9s in the previous block hash. It works as follows:

- the hash contains six 9s or less: regular block
- the hash contains seven or eight 9s: 8 times the regular block (about 5% chances)
- the hash contains nine or more 9s: 64 times the regular block (about 1% chances)

Premined 1% as reserved bounty and reward for developers, giveaway, pool, explorers, etc. Graincoin also provides 5% annual interest on the grained held. The interest will be paid about every 2 weeks.





Specifications

   - scrypt
        - 30 seconds block target
   - 1024-2048 grains per block for normal blocks
   - 8 times or 64 times the regular payout per block for super blocks depends on the number of 9s in the previous hash
   - Difficulty retargets every block
   - mining payout will be halved every 90 days (259200 blocks)
   - minimum payout per block 1 coin
   - Total grains will be 50 billions
   - 6 confirmations for transaction
   - 50 confirmations for minted blocks
   - PoS interest 5% yearly
   - PoS min age 10 days
   - PoS max age 30 days

   - Ports: 11054 (connection) and 11055 (RPC)


Official websites:
http://www.graincoin.net
http://www.graincoin.org
http://www.graincoin.info


Graincoin is on CoinMarketCap:
http://coinmarketcap.com/


Graincoin on Cryptoarticles:
http://www.cryptoarticles.com/crypto-news/2014/1/25/coinpayments-now-supports-grain
http://www.cryptoarticles.com/crypto-news/2014/1/15/grain-the-future-unit-of-cyber-coin
http://www.cryptoarticles.com/crypto-news/2014/1/18/grain-new-wallet-released-version-14
http://www.cryptoarticles.com/crypto-news/2014/1/23/grain-more-valuable-than-yould-think





Exchanges

SwissCoin Exchange:
GRA/LTC:
https://www.swisscex.com/market/GRA_LTC







Mining Pools



Block Explorer

http://explorer.graincoin.net/



Shops, Services, Games that accept GRA

http://s24.postimg.org/kcete89hh/ga_banner1_200.png


Coinpayments:
https://www.coinpayments.net/images/logo.png
https://www.coinpayments.net/
Graincoin is supported by Coinpayments, which provides wonderful tools and utilities to accept Graincoin as payments for the shops, services.
Tutorial for how a shop/service can integrate with Coinpayments will be avaialble soon.

Wood Shot Glass - it has Graincoin customized shot glasses!
http://woodshotglass.com/

Tuff Wraps
http://tuffwraps.com/

Computer hardware and consumer electronics  
http://brownboxtech.net

WaterIdo - Healthy Water Revitalizer
http://waterido.com  

Xbox Gold 48 Hour Codes - 2 for $1
http://xbox48.bugs3.com

Iquidus Technology - OpenSource Software, Hi-Performance Hardware
http://www.iquidus.co.nz/
http://www.iquidus.co.nz/?q=graincoin

Retro Towers - Gaming Hardware
http://www.retrotowers.co.uk/

Citrus Fit - Weight loss and detox products
http://citrusfit.com/

Stickerz Lab - French Sticker Decorations
http://stickerzlab.com/

Pixcoin - Stickers for Crypto Coins
http://pixcoin.com/

Crypto GameKeys - Buy CD Keys, PSN cards, PS3/4/Vita games
www.cryptogamekeys.com

ThanksBitcoin - a Bitcoin shop
http://www.thanksbitcoin.com

Crypto Coin Stuff - Cryptocoin banners, stickers etc
http://www.cryptocoinstuff.com

Advertise Service
http://cryptotiler.com/


AltCoin Auctions
http://altcoinauctions.com/wp-content/uploads/2014/07/altcoinauctionslogonew.png


Socials, Discussions etc

The following socials, discussion groups etc are sponsored by Grain mining members. They are "unofficial" and are not managed/admin'd by the Grain Dev Team.

Cryptocointalk discussion threads:
https://cryptocointalk.com/forum/509-grain-gra/

Subreddit:
http://www.reddit.com/r/Graincoin/

Facebook pages:
https://www.facebook.com/Graincoin
https://www.facebook.com/Graincoin.Cryptocurrency

Coinwiki GrainCoin article:
http://coinwik.org/Grain


Bounties

100K GRAs for shops, services, games that accept Grain!
Note: personal blogs are not considered as services.

Bounties will be given out as needed, for significant contributions to the Grain or its promotions.
You could find the active bounties at coinbounties.com as well as many others.





Giveaways

https://bitcointalk.org/index.php?topic=389595.0 (closed)
https://bitcointalk.org/index.php?topic=361887.0 (closed)


Faucet:

http://www.thebitcoinmaster.com/grain/index.php
http://deathxchange.com/graincoins.php





Downloads (Version 1.6.2)

Windows Client Downloads

sourceforge.net:
graincoin-1.6.2.0-win32.zip


Source Code Download
https://github.com/grain-crypto/grain

Block Chain Download

To save your time on synchronization or reindexing the blockchain, download the blockchain.zip file and unzip its content into %APPDATA%\Grain folder on Windows systems or into ~/.Grain on Unix/Linux systems. If you choose this possibility and have existing wallet then start the grain-qt/graind with '-rescan' option for the first time after unpacking the blockchain files.


Mining Configurations


Sample Config File (grain.conf):



How to Solo Mine

1. Start up grain-qt, wait for it to load, then exit.
2. Put grain.conf (see sample file above) in your c:/users/**yourcomputername**/AppData/Roaming/Grain
3. restart grain-qt, and you should connect and sync.
4. For solo mining, launch cgminer or the mining program you use and begin mining.
      cgminer ex: cgminer.exe --scrypt -o localhost:11055 -u **yourusername** -p **password** (without **)

Here is the link to original GrainCoin thread for historical purposes.