|Central bank||None, the primecoin peer-to-peer network regulates and distributes through consensus in protocol.|
|Date of introduction||7 July 2013|
|Inflation||Limited release, production rate before this limit re-evaluated with the production of every block (at a rate of approximately 1 block per minute) based on the difficulty with which primecoins are produced.|
|Page Template:Nobold/styles.css has no content. 0.001||mXPM (millicoin)|
|Page Template:Nobold/styles.css has no content. 0.000001||μXPM (microcoin)|
|Page Template:Nobold/styles.css has no content. 0.00000001||Smallest unit|
Primecoin (sign: Ψ; code: XPM) is a peer-to-peer open source cryptocurrency that implements a unique scientific computing proof-of-work system. Primecoin's proof-of-work system searches for chains of prime numbers. Primecoin was created by a person or group of people who use the pseudonym Sunny King. This entity is also related with the cryptocurrency Peercoin. The Primecoin source code is copyrighted by a person or group called “Primecoin Developers”, and distributed under a conditional MIT/X11 software license.
Primecoin has been described as the main cause of spot shortages of dedicated servers due to the fact that at the time it was only possible to mine the currency with CPUs. For the same reason, Primecoin used to be the target of malware writers.
Currently there are many GPU miners available both in solo and pool mining variations.
- Scarcity is governed by the nature of prime number distribution
- Almost all cryptocurrencies in existence define their scarcity properties merely by set of predefined values in source code, whereas scarcity of Primecoin is based purely on a relationship of a simple function and mathematical property of natural occurrence of prime chains in the set of whole numbers that are.
- No predefined ultimate number of coins
- Instead of having hard-set ultimate number of coins in its code like many other alternative cryptocurrencies, number of Primecoins released per block is always equal to 999 divided by the square of the difficulty. There has been some attempts at approximating this number. The number of Primecoins that will be mined will be determined by the progress of its adaptation by the mining community, improvements that will be done to the mining algorithms and ultimately by Moore's law.
- Difficulty adjustment is more frequent
- Primecoin protocol adjusts its difficulty slightly after every block. The difficulty change that occurs each block is targeted at achieving target of one new block created once per minute.  As comparison the Bitcoin protocol adjusts its difficulty every 2016 blocks, or approximately every two weeks.
- Faster transaction confirmations
- Since Primecoin blocks are generated 8 to 10 times as fast as Bitcoin blocks on average, Primecoin transactions are confirmed approximately 8 to 10 times as fast.
The system is designed so that the work is efficiently verifiable by all nodes on the Primecoin network. To meet this requirement, the size of the prime numbers in the system cannot be too large. The Primecoin proof-of-work system has the following characteristics:
- Primecoin's work takes the form of prime number chains.
- Finding the prime number chains becomes exponentially harder as the chain length is increased.
- Verification of the reasonably sized prime number chains can be performed efficiently by all network nodes.
- Mersenne primes are precluded due to their extremely large size.
- Three types of prime number chains are accepted as proof-of-work:
- Anonymous Internet banking
- Alternative currency
- Money supply
- Moore's law
- Prime number
- Cunningham chain
- Clark, Jack (2013-07-16). "Virtual currency speculators shut down cloud". The Register. Retrieved 2014-02-02.
- King, Sunny (pseudonym) (2013-07-07) (PDF). Primecoin: Cryptocurrency with Prime Number Proof-of-Work. http://primecoin.org/static/primecoin-paper.pdf. Retrieved 2013-11-07.
- Bradbury, Danny (2013-01-02). "Why are so many digital currency players anonymous?". CoinDesk. Retrieved 2014-03-14.
- Gilson, David (2013-07-10). "New currency Primecoin searches for prime numbers as proof of work". CoinDesk. Retrieved 2014-02-08.
- Primecoin Developers (2013-07-25). "Primecoin High Performance 0.1.1 BETA README" (Text file). Primecoin High Performance – Browse /0.1.1-hp8 at SourceForge.net. mikaelh2. Retrieved 2014-02-11.
- Miller, Rich (2013-12-17). "Currency Miners Cause Spot Shortages of Dedicated Servers". Data Center Knowledge. Retrieved 2013-12-18.
- Muncaster, Phil (2014-01-17). "Bitcoin's so over. We're mining Primeco... Oh SNAP, my box is a ZOMBIE!". The Register. Retrieved 2014-02-02.
- Goodin, Dan (2013-12-17). "What a successful exploit of a Linux server looks like". Ars Technica. Condé Nast. Retrieved 2014-02-02.
- Buterin, Vitalik (2013-07-08). "Primecoin: the cryptocurrency whose mining is actually useful". Bitcoin Magazine. Coin Publishing Ltd.