Notes & experiments
The garden.
Things learned, ideas explored, and useful details kept along the way.
All notes
73–84 of 170
- Android signing fingerprints and Facebook key hashes
Distinguish local/upload certificates from the certificate that signs the application delivered by Play.
Mobile & interfaces - Batch contract reads with a multicall watcher
Two older JavaScript watcher examples, with block consistency, polling lifetime, and numeric precision in view.
Blockchain / Tools & experiments - Build a Bitcoin PSBT from discovered UTXOs
An older four-address-type sender, with input data, fee estimation, address validation, and broadcast limits explicit.
Blockchain - Build a JMeter plan, then run it without the GUI
A historical JMeter 5.4.1 plan with thread settings, response assertions, and separate result artifacts.
Cloud & systems / Tools & experiments - Building a slide-up Flutter panel in stages
Separate the panel's static layout, visibility state, controller, and animation.
Mobile & interfaces - Building Bitcoin transactions with PSBTs and custom UTXOs
A historical BitcoinJS experiment covering four address families, fee estimation, and explicit input selection.
Blockchain / Tools & experiments - Choosing Git identity by repository directory
Conditional Git configuration without publishing real names, email addresses, or workstation paths.
Tools & experiments - Cloud architecture terms worth separating
Shared responsibility, availability, recovery objectives, scaling, and infrastructure boundaries from an earlier AWS notebook.
Cloud & systems - CloudFront private content has two access boundaries
An older signed-URL and signed-cookie experiment, rewritten around origin protection and viewer authorization.
Cloud & systems - Combining cached and network data in Flutter
An older stream-based cache pattern that distinguishes local display data from network results.
Mobile & interfaces - Comparing Flutter microtasks and post-frame callbacks
A small recorded lifecycle trace that distinguishes two scheduling boundaries.
Mobile & interfaces - Converting a PuTTY key for an OpenSSH client
Historical Linux and macOS commands for changing a private key's file format without changing its purpose.
Cloud & systems / Tools & experiments