Proof-of-stake

proof of stakeDPOS (Delegated Proof of Stake Algorithm)generatesPoS
Proof of stake (PoS) is a type of algorithm by which a cryptocurrency blockchain network aims to achieve distributed consensus.wikipedia
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Cryptocurrency

cryptocurrenciescrypto-currencyaltcoin
Proof of stake (PoS) is a type of algorithm by which a cryptocurrency blockchain network aims to achieve distributed consensus.
The scheme is largely dependent on the coin, and there's currently no standard form of it. Some cryptocurrencies use a combined proof-of-work/proof-of-stake scheme.

Blockchain

Blockchainsblockchain technologyblock
Proof of stake (PoS) is a type of algorithm by which a cryptocurrency blockchain network aims to achieve distributed consensus.
Alternative consensus methods include proof-of-stake.

Proof-of-work system

proof-of-workproof of workreusable proof of work
In contrast, the algorithm of proof-of-work-based cryptocurrencies such as bitcoin uses mining; that is, the solving of computationally intensive puzzles to validate transactions and create new blocks.
Proof-of-Stake, Proof of bandwidth, and other approaches have been discussed in the context of cryptocurrency.

Nxt

Nxt Foundation
Nxt and BlackCoin use randomization to predict the following generator by using a formula that looks for the lowest hash value in combination with the size of the stake.
It uses proof-of-stake to reach consensus for transactions—as such there is a static money supply and, unlike bitcoin, no mining.

Peercoin

Peercoin's proof-of-stake system combines randomization with the concept of "coin age", a number derived from the product of the number of coins multiplied by the number of days the coins have been held. Peercoin is the first cryptocurrency that applied the concept of PoS. In its early stages, it used centrally broadcast checkpoints signed under the developer's private key. No blockchain reorganization was allowed deeper than the last known checkpoints. Checkpoints are opt-in as of v0.6 and are not enforced now that the network has reached a suitable level of distribution.
Peercoin, also known as PPCoin or PPC, is a peer-to-peer cryptocurrency utilizing both proof-of-stake and proof-of-work systems.

Consensus (computer science)

consensusconsensus problemsdistributed consensus
Proof of stake (PoS) is a type of algorithm by which a cryptocurrency blockchain network aims to achieve distributed consensus.

Bitcoin

bitcoinsbitcoin walletBitcoin blockchain
In contrast, the algorithm of proof-of-work-based cryptocurrencies such as bitcoin uses mining; that is, the solving of computationally intensive puzzles to validate transactions and create new blocks.

Bitcoin network

bitcoin miningminingBitcoin protocol
In contrast, the algorithm of proof-of-work-based cryptocurrencies such as bitcoin uses mining; that is, the solving of computationally intensive puzzles to validate transactions and create new blocks.

Digital signature

digital signaturesdigitally signeddigitally sign
Peercoin is the first cryptocurrency that applied the concept of PoS. In its early stages, it used centrally broadcast checkpoints signed under the developer's private key. No blockchain reorganization was allowed deeper than the last known checkpoints. Checkpoints are opt-in as of v0.6 and are not enforced now that the network has reached a suitable level of distribution.

Public-key cryptography

public keypublic key cryptographyprivate key
Peercoin is the first cryptocurrency that applied the concept of PoS. In its early stages, it used centrally broadcast checkpoints signed under the developer's private key. No blockchain reorganization was allowed deeper than the last known checkpoints. Checkpoints are opt-in as of v0.6 and are not enforced now that the network has reached a suitable level of distribution.

Ethereum

EtherETHETH blockchain
Ethereum's suggested Slasher protocol allows users to "punish" the cheater who forges on top of more than one blockchain branch. This proposal assumes that one must double-sign to create a fork and that one can be punished for creating a fork while not having stake. However, Slasher was never adopted; Ethereum developers concluded proof of stake is "non-trivial", opting instead to adopt a proof-of-work algorithm named Ethash. It is planned to be replaced by a different PoS protocol called "Casper".

Ethash

Ethereum's suggested Slasher protocol allows users to "punish" the cheater who forges on top of more than one blockchain branch. This proposal assumes that one must double-sign to create a fork and that one can be punished for creating a fork while not having stake. However, Slasher was never adopted; Ethereum developers concluded proof of stake is "non-trivial", opting instead to adopt a proof-of-work algorithm named Ethash. It is planned to be replaced by a different PoS protocol called "Casper".

Timestamp

time stamptimestampstimestamping
Decred's hybrid proof-of-work and proof-of-stake, in which proof of stake is an extension dependent on the proof-of-work timestamping, based on the "proof of activity" proposal, which aims to solve the nothing-at-stake problem by having proof-of-work miners mining blocks and proof-of-stake acting as a second authentication mechanism.

Daniel Larimer

Daniel Larimer was also the creator of the DPOS (Delegated Proof of Stake Algorithm) consensus algorithm and Graphene technology.

Gridcoin

Gridcoin uses a more energy efficient proof-of-stake system - although it fails to explicitly address the energy cost of computing power.

PotCoin

PotCoin is an open source software project released under the MIT/X11 license and was technically nearly identical to Litecoin until August 23, 2015, when Potcoin changed to Proof-of-Stake-Velocity (PoSV).

EOS.IO

EOSEOS.io blockchain
EOSIO accomplishes this by being both multi-threaded (able to run on multiple computer cores) as well as using delegated proof-of-stake for its consensus protocol.

Shafi Goldwasser

GoldwasserGoldwasser, S.Goldwasser, Shafi
She is also a scientific advisor for several technology start ups in the security area, including QED-it, specializing in the Zero Knowledge Blockchain, and Algorand, a Proof-of-stake Blockchain.

NEO (cryptocurrency)

NEO
The base asset of the NEO blockchain is the non divisible NEO token which generates GAS tokens that can be used to pay the transaction fees to utilize the NEO network.

SHA-2

SHA-256sha256Secure Hash Algorithm 2
Several cryptocurrencies like Bitcoin use SHA-256 for verifying transactions and calculating proof of work or proof of stake.

Digital currency

electronic moneydigital currencieselectronic purse
In some cases a proof-of-work or proof-of-stake scheme is used to create and manage the currency.

Privacy and blockchain

After nodes confirm that a block is valid, consensus protocols, such as proof of work and proof of stake, are then deployed by miners.

POS

Proof-of-stake, a cryptocurrency blockchain distributed consensus method

Proof-of-authority

This is considered more robust than PoS (proof-of-stake), as: