web 5 spam filtering 5 spam bots 5 server defense 5 security library 5 security component 5 security challenge 5 recaptcha 5 proof-of-work 5 proof of work 5 pow 5 malicious traffic 5 login security 5 invisible captcha 5 internet security 5 human verification 5 human test 5 hcaptcha 5 hashcash 5 hash puzzle 5 hash function 5 fraud prevention 5 fraud detection 5 javascript 5 defense 5 captcha 5 bun 5 antispam 5 anti-scraper 5 website security 5 website protection 5 website defense 5 web defense system 5 web defense 5 web application security 5 web application protection 5 user experience 5 unwanted traffic 5 turing test 5 traffic monitoring 5 traffic management 5 threat intelligence 5 target difficulty 5 spam prevention 5 spam mitigation 5 bot prevention 5 bot mitigation 5 bot management 5 bot detection 5 bot defense 5 automated scraping 5 automated attacks 5 application security 5 anti-spam 5 anti-exploitation 5 anti-dos 5 anti-ddos 5 anti-bot 5 anti-automation 5 anti-abuse 5 api security 5 api protection 5 api analytics 5 api defense 5 api abuse 5 abuse prevention 5 abuse detection 5 account security 5 form security 5 digital security 5 defense mechanism 5 ddos protection 5 ddos 5 cybersecurity 5 cryptographic puzzle 5 cryptographic defense 5 cryptographic challenge 5 crypto puzzle 5 computational puzzle 5 bot traffic 5 brute force 5 challenge generator 5 challenge string 5 challenge verifier 5 challenge-response 5 challenge-response protocol 5 client-server architecture 5 computational challenge 5 computational complexity 5 computational defense 5 performance optimization 4 performance testing 4 pnpm 4 process 4 production 4 programming 4 proof 4 proof generation 4 proof generator 4 proof verification 4