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GrainCoin Official Development Tree

GrainCoin - a hybrid scrypt PoW + PoS based cryptocurrency.

What is GrainCoin (Grain)?

GrainCoin (abbreviated GRA), also known as Grain is a cryptocurrency design featuring proof-of-stake consensus as a security model, with a combined proof-of-stake/proof-of-work minting system. GrainCoin is based on Bitcoin, while highlighting many important innovations to the cryptocurrency field including a new security model, energy efficiency, a better minting model and more adaptive response to a rapid change in network computational power.

  • 30 seconds block target
  • 1024-2048 GRA per block for normal blocks
  • 8x or 64x the regular payout per block for superblocks depending 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 GRA
  • Total blackchain emission will be 50 billion GRA
  • 6 confirmations for a transaction
  • 50 confirmations for minted blocks
  • Peer port is 11054 for MainNet and 21054 for TestNet
  • RPC port is 11055 for MainNet and 21055 for TestNet
  • Community IRC can be found on Freenode at #GrainCoin

Each GrainCoin block provides a random 1024-2048 GRA initially. There are also rare superblocks. GrainCoin employs a hash-based algorithm to determine superblocks based on the number of 9s in the previous block hash.

Superblocks work as follows

  • Regular block, the hash contains less than or equal to six 9s
  • 8x Superblock, the hash contains seven or eight 9s (~5% chance)
  • 64x Superblock, the hash contains greater than or equal to nine 9s (~1% chance)

GrainCoin also provides 5% annual interest on the GRA held. The interest will be paid approximately every 2 weeks.

GrainCoin Resources

License

GrainCoin is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.

Development Process

The master branch is regularly built and tested, but is not guaranteed to be completely stable. Tags are created regularly to indicate new official, stable release versions of GrainCoin.

Developer IRC can be found on Freenode at #GrainCoin-dev.

Testing

Manual Quality Assurance (QA) Testing

Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.