Unverified50% confidenceFactExact time
The JA3 fingerprint was proposed in 2017 by John Althouse and others at Salesforce, generating a unique fingerprint by MD5-hashing multiple parameters from the Client Hello message in the TLS handshake.
1
Sources
50%
Confidence
Long-term
Relevance
8/10/2026
First Seen
Sources
ScrapeOps Proxy Tester：用实测数据为爬虫选对代理
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