Questions tagged [ouroboros]

Cardano's provably secure proof-of-stake protocol.

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Specs for local-state queries

Does anyone know where I can find on-the-wire specs / cddl for the ledger-specific payloads of the local-state queries? I have the specs for the top-level state-machine messages of the polymorphic ...
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Will Ouroboros Crypsinous be included in Ouroboros Omega?

Last year at the 2021 Cardano Summit, IOHK provided a YouTube video that overviews the Ouroboros family of protocols developed since 2016, the consensus enhancements and security features they provide,...
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Is a block winning a height battle with a 43 second prop time a potential form of MEV?

Would someone please be so kind as to explain how a block with a 43 second prop time wins a height battle??? Block #: 6777986 Pool ID: 2cf87fadec7130c7e41910492073ae4dbe65ca462c1fdc3d2a56d015 ...
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What are the steps in producing a block in Cardano?

I would love a high-level overview suitable for a beginner that covers collecting transactions, proposing a block, propagating the block, and then finally verifying it.
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Are there papers (e.g. game theorie based) on how Ouroboros encourages decentralization of ADA among its users?

In Ouroboros, the more ADA you have the bigger the chance to get elected to mine the next block and get the rewards. Apart from other parameters and up to the saturation level for a single poole this ...
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Why Ouroboros Chronos and Proof-of-History need synchronization of time?

Which problem is solved if the time is synchronized between nodes? I know of two protocols which implement time synchronization: Ouroboros Chronos and Proof-of-History, how do they differ?
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What are input endorsers and how do they make Cardano more scalable?

Charles Hoskinson talked about input endorsers in a recent livestream and said they could improve the throughput of the base ledger by a factor of 20 to 40. What are input endorsers and how do they ...
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Highly-available relay node (round robin & Ouroboros)

I'm thinking of adding multiple relay-node instances behind a load-balancer to avoid downtime during maintenance windows, updates, restarts, etc. From the outside world (public network), this would be ...
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What does it mean that Ouroboros is formally verified?

I was talking with some friends about Cardano the other day and I brought up the fact that Ouroboros is formally verified. One of my friends asked me to explain what that means and why it's ...
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Will the variables of the gas calculation formula be able to be dynamically adjusted by the protocol on Cardano?

My curiosity prompts me to ask you a question... We have seen with many L1 Blockchains a recurring problem: the transaction fees fatally get more and more expensive with the valuation of the native ...
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Ouroboros – Which version is currently implemented?

I was reading this blog post From Classic to Hydra and I was wondering which version of Ouroboros is currently implemented in Cardano: Classic, BFT or Praos? Thank you!
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Validating transactions

Original question: When 51% or more of consensus participants validate any transaction for recording on-chain, against what evidence are they validating? Original Answer: Each transaction is broadcast,...
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Difference between Ouroboros' Proof of Stake and Solana's Proof of History

What are the key differences between Ouroboros' Proof of Stake and Solana's Proof of History in aspects such as security, decentralization, functionality, efficiency (such as number of transactions ...
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Can someone who is familiar with Ouroboros explain its fault tolerance threshold?

Ouroboros claims to be <50% Byzantine fault tolerant with regards to persistence. I was wondering why is it that some other PoS systems settle for 33% (e.g. Casper), when 50% is provably achievable?...
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How does Ouroboros disincentivize bad behavior?

How does Ouroboros disincentivize bad behavior? For example, in ETH 2, poorly behaving nodes have their stake slashed. Does Ouroboros have a similar mechanism?
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Will Ouroborous work if a nontrivial portion of validators are on the moon?

Will Ouroborous work if a non trivial stake (say 5%) is delegated to validators on the moon? What about mars? How about one of the moons of Jupiter? If not, why not? If yes, how does the consensus ...
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Is the Ouroboros Praos protocol proprietary?

The slots and epochs section of the Cardano Stake Pool Course states that the Ouroboros Praos protocol is proprietary. Is this correct and, if so, is there a reason why this central part of the ...
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How secure is Ouroboros Proof of Stake compared to Bitcoin Proof of Work?

It is generally thought of that Proof of Work is more secure than competing consensus algorithms. What security guarantees does using a Bitcoin PoW provide, and how does Ouroboros Praos compare? Will ...
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