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Verify an Indexer Can Recover from a Chain Reorganization

An indexer can reach the latest block and still serve data from an abandoned chain. Its checkpoint advances, its health endpoint stays green and its token balance includes a transfer that no longer exists in canonical history. Recovery needs a stronger acceptance test: after replacing a branch, every indexed result must match an independent rebuild of the selected canonical history. This tutorial…

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How I Built a Real-Time rPPG Heart Rate Tracker in Python (POS Algorithm & Butterworth Filtering)

Continuous biometric monitoring usually requires dedicated contact hardware like smartwatches or pulse oximeters. However, standard laptop webcams can capture subtle skin color variations caused by…

  • Real-time rPPG heart rate monitoring achieved with Python framework BioSense Tracker Pro
  • POS algorithm and Butterworth bandpass filtering address camera noise and specular reflections
  • System runs on standard CPU threads with low latency for real-time applications

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