Decred traces its origins back to April 2013 when a pseudonymous developer named tacotime responded to a thread on Bitcointalk stating that they had been thinking up a new cryptocurrency. Shortly thereafter, following a promise to share a technical specification of the idea, tacotime started a new thread, publishing a whitepaper titled "Memcoin2 (MC2): A Hybrid Proof-of-Work, Proof-of-Stake Crypto-currency". The proposal extended and combined the principles of both Litecoin and Peercoin, and was developed using btcd, the platform created by Decreds current developers.
Throughout 2013 tacotime attempted to coordinate development of the project with another pseudonymous individual named ingsoc, eventually looking for a lead developer to get the project off the ground towards the end of the year. At the start of 2014 tacotime began work on another cryptocurrency, now known as Monero, becoming a part of the founding core team for the project. Nevertheless tacotime was still working on MC2 in the background.
In early 2014, ingsoc approached Company Zero (CO) and CEO Jake Yocom-Piatt with tacotime’s MC2 concept, merging efforts to develop the Decred system. At the time, CO, formerly known as Conformal Systems, was an open-source software engineering firm that focused on privacy and security oriented solutions including btcd (eventually migrated to btcsuite), an alternative full node Bitcoin implementation written in Go. In late 2015. C0 published a series of blog posts outlining challenges they saw in Bitcoin and proposals for iterating upon it.
Ultimately, on December 12, 2015, Decred was announced as a solution to Bitcoin's perceived problems, which included inefficient governance and capture by core developers, lack of development funding, and excessive miner power over the Bitcoin network. The proposal was for "an open, progressive, and self-funding cryptocurrency with a system of community-based governance integrated into its blockchain." At the core of the project was a hybridized proof-of-work proof-of-stake (PoW/PoS) consensus system that aimed to strike a balance between PoW miners and PoS voters to create a more robust notion of consensus.
On February 8, 2016 the Decred mainnet launched along with the Decred constitution, a set of principles and guidelines that provide users a clear understanding of the social contract between themselves and the project. At launch, 8% of the total supply was pre-mined, with 4% used to compensate the developers and 4% air-dropped to 2,972 people who signed up.
In June 2017 Decred became the first blockchain to make a successful direct on-chain user-activated consensus vote. In October 2018 Decred's Politeia proposal system launched, allowing Decred users and stakeholders to propose, discuss, collaborate on, and fund new projects, initiatives, and consensus changes on an off-chain platform. Since then Politeia has been used for a wide range of governance decisions including research, bug bounties, and even public relations. Current initiatives launched on Politeia include privacy upgrades, support for Lightning Network, an expanded communications plan, and a decentralized exchange.
Decred is a hybrid proof-of-work (PoW) proof-of-stake (PoS) network with on-chain governance and a decentralized treasury. Decred, the protocol, is a distributed, time-stamped ledger of unspent transaction output (UTXO) transfers stored in an append-only chain of dynamic-sized data blocks. A network of mining and economic nodes maintains this blockchain by validating, propagating, and competing to include pending transactions (mempool) in new blocks. Economic nodes (aka "full nodes") receive transactions from other network participants, validate them against network consensus rules and double-spend vectors, and propagate the transactions to other full nodes that also validate and propagate. Valid transactions are sent to the network's mempool waiting for mining nodes to confirm them via inclusion in the next block.
Mining nodes work to empty the mempool usually in a highest-to-lowest fee order by picking transactions to include in the next block and racing against each other to generate a hash less than the target number set by Decred's difficulty adjustment algorithm. Decred uses a Proof-of-Work (PoW) consensus mechanism to establish the chain of blocks with the most accumulated “work” (a.k.a., energy spent on solved hashes) as the valid chain. Decred also uses a Proof-of-Stake (PoS) consensus mechanism to validate blocks submitted by miners (and vote on Decred governance proposals). The PoS layer serves to provide a check on miner power.
Decred is actively pursuing integration with the Lightning network. So users can initiate payments across Bitcoin’s network with its native token DCR and potentially hold multiple assets in Decredition, the Decred wallet solution. Additional steps required to release the decentralized exchange they are focused on building.
Currently, the project is adding support for Decentralized Autonomous Entities, DAEs, of which the Politeia is the first example. So users can band together with like-minded individuals to create organizations to support their missions.