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to validate a node why can't we only use captcha verification why do we need high computational things? |
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Captcha's are highly subjective and open to misinterpretations. Also, how do you avoid dishonest nodes by a Captcha? Also, imagine the inefficiency, how do you scale this too? You cannot. Why we need PoW/PoS? It is to keep the entire network fault-tolerant—refer Byzantine Fault Tolerance—whilst having a general consensus b/w the full-nodes/miners/validators and the nodes, to avoid dishonest participants. In order to guarantee that all participants ("nodes") in a blockchain network agree on a single version of history, blockchain networks—like Bitcoin and Ethereum—implement what's known as consensus mechanisms. |
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Captcha's are highly subjective and open to misinterpretations. Also, how do you avoid dishonest nodes by a Captcha? Also, imagine the inefficiency, how do you scale this too? You cannot.
Why we need PoW/PoS? It is to keep the entire network fault-tolerant—refer Byzantine Fault Tolerance—whilst having a general consensus b/w the full-nodes/miners/validators and the nodes, to avoid dishonest participants.
In order to guarantee that all participants ("nodes") in a blockchain network agree on a single version of history, blockchain networks—like Bitcoin and Ethereum—implement what's known as consensus mechanisms.