Android cached tag metadata validation — 2026-10-09

Candidate and device

• Commit: bdb0fb4dd5a60fe55958283beb667978f34ed366 on v4.
• Package manifest: 4.0.0-beta.10, with unreleased Unicode/Babel and example changes. This is a source-checkout test, not a published beta.10 or final stable tarball test.
• Device: Samsung SM-N975U1, Android 12.
• Application: React Native 0.84 New Architecture CLI example, locally built debug APK.
• Cards: NFC-V and ISO-DEP over NFC-A; manufacturer/model not recorded.

Physical-device observations

The user scanned both cards. App logs were inspected over ADB, and the user confirmed that discovery and getTag() results matched after completing the instructed test.

Technology	Discovery metadata	getTag() metadata	Cleanup observed
NFC-V	dsfid: 0, responseFlags: 0 at 10:30:29	Same values at 10:33:04	Request closed at 10:33:06
ISO-DEP over NFC-A	atqa: [68, 3], sak: 32, historicalBytes: [128] at 10:30:48	Same values at 10:33:23	Request closed at 10:33:25

Times are Asia/Taipei on 2026-10-09. Reader-mode discovery used flags 139; technology requests used flags 136 (NFC-V) and 131 (ISO-DEP), including FLAG_READER_SKIP_NDEF_CHECK. These actions read cached metadata and do not send transceive commands or write tags. No errors appeared in the captured flows. The captured log contains one getTag() request per technology; it does not establish a repeat count.

Earlier NFC-A/NTAG215 metadata evidence is recorded in the September validation record. Representative NFC-A, NFC-V and ISO-DEP over NFC-A cached metadata now have physical-device evidence. ISO-DEP over NFC-B hiLayerResponse remains unverified.

Software verification

• Root build, lint, public types and 163 mocked tests passed.
• Example: 15 mocked tests passed.
• Packed-package check: 107 files, required files present and generated build artifacts absent.
• Local Android all-ABI debug build passed.
• Hosted CI for this commit: Validate (including packed Codegen matrix), Android New Architecture, iOS New Architecture and Native build gate all passed.

Compiler and mocked-test results are separate from the physical observations above.

Remaining scope

This record does not verify ISO-DEP/NFC-V transceive, iOS ISO 15693, configured transceive timeout, background/resume, Expo device behavior or the final stable artifact. PR #843's same-session NDEF write/read regression still needs a writable NDEF tag. No publication was performed for this candidate.