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CKey-Format-v0.18.0.md

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CKey Format v0.18.0 — Profile 2 Deterministic Visual Fill

Status: experimental profile. This revision emits format=18 (12), profile=2; decoders continue to accept legacy Profile 2 Formats 0.9 and 0.15. The frame, geometry, and RS parameters otherwise remain those of Format 0.15.

Profile 2 carries 1–200 bytes in a 210-byte frame protected by systematic RS(255,210), with 45 parity bytes. The frame is C7 4B 12 02 LLhi LLlo payload CRC32C padding. CRC-32C covers magic through payload. Remaining data bytes through offset 209 use the deterministic visual-fill algorithm specified in Format 0.17.0, seeded by CRC-32C over the frame through its CRC. This is visual decorrelation only: the complete 210-byte data block is still protected by RS, and CRC remains the payload integrity check. Format 0.15 zero-padding and Format 0.9 remain readable.

The 29-unit field, one inward-facing rounded arc per corner, Grid/Ray/Ring calibration keys, Cartesian and polar placement, and connected round-capped ring runs are unchanged. Profile 2 image decoding remains experimental and requires physical-capture validation.