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Handbook of digital currency
An educational resource exploring Bitcoin's innovation, blockchain technology, financial instruments, and big data analytics in the cryptocurrency space
last checked Jul 13, 2026 · HTTP 403
CohortClass of 2026What it is
An educational resource exploring Bitcoin's innovation, blockchain technology, financial instruments, and big data analytics in the cryptocurrency space. Designed for readers seeking to understand digital currency fundamentals and their impact on modern finance.
HTTP liveness
9 probes since Jun 16Jun 16Jul 13
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — unverifiedCloudflare block
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Pulse Indexobserved activity
182/4 signal families
Liveness40%0.20
Press30%no data
GitHub20%no data
Tranco10%1.00
Weighted observed activity · updated Jul 15
Cohort survival · Class of 2026weekly
567 products launched in 2026 · 100% still active
567 active0 sunset
Still active
100%
Median lifespan
4.9y