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One question
Why is consensus more than PoW or PoS?
Participation, fork choice and confirmation need separate answers.
Consensus mechanisms help distributed participants agree on acceptable chain state. PoW and PoS are common shorthand, but a complete mechanism also involves validity, fork choice and confirmation rules.
Ask who proposes updates, how many fabricated identities are constrained, how disagreement is resolved and when a result can be relied upon.
These questions compare designs more clearly than ranking chains by an acronym.
Agreement and Sybil resistance answer different questions
If every account gets one vote, one person can create thousands of accounts. Sybil resistance limits influence gained by cheaply multiplying identities; it need not prevent identity creation. PoW relates mining influence to computational work, while PoS relates participation weight to stake committed under protocol rules.
Weight still needs a decision procedure. When conflicting transactions reach different nodes first, the system must decide what to accept, how to resolve disagreement and when results can be relied on. PoW/PoS are useful shorthand, not complete answers. Mechanisms can overlap: Bitcoin also uses accumulated work to compare candidate histories, so PoW does more than select a proposer.
A signature or DID can help verify authorization without proving that thousands of identities represent thousands of different people. Authentication, eligibility and voting weight require separate rules.
Sources and further reading
Check your understanding
Does knowing that a chain uses PoS establish its finality rules?
No. Examine voting, fork choice and finality separately.
Continue along a learning path
- Understand the layers of blockchainStep 2 of 18
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Terms
- Blockchain
A distributed ledger that links records cryptographically and uses shared validation and consensus rules to establish an accepted transaction history.
- Consensus
How separate parties end up with the same ledger without one of them being in charge. Every chain picks a rule for this, and the choice decides what it costs to disagree.