WORK-021 — Increase Bootstrap PoW to 26 Bits

Feature: Bootstrap proof-of-work difficulty adjustment Status: Complete

Tasks

1. Increase bootstrap proof-of-work difficulty to 26 bits.
- Files: lib/services/device_private_event_service.dart
2. Update the production policy test.
- Files: test/services/device_private_event_service_test.dart
3. Self-review against INVARIANTS.md

Test Coverage

Scenario	Expected	Status
Bootstrap policy	Uses 26 proof-of-work bits	[x]
Mining lifecycle	Existing isolate and cancellation behavior remains unchanged	[x]

Decisions

2026-07-15 — Bootstrap difficulty

Context: The bootstrap event currently uses 24 bits and should use the requested higher difficulty. Decision: Set the production bootstrap policy to 26 bits. Rationale: 26 bits doubles the expected work over 25 bits while retaining the existing background isolate execution and lifecycle behavior.

Spec Issues

None

Progress Notes

2026-07-15: Updated bootstrap PoW policy and focused test expectation to 26 bits.

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