Sample
verify page.screenshot in pkg:npm/puppeteer@23.11.1
sha256:3893fae39e32f208bf97aa282a63285ce18b4433fa395ff72d80aa7a963ae2a7
Publication state. LOCAL_PASS passed only on its author's machine; PUBLISHED is public and awaiting independent verification; CROSS_PASS was reproduced by another verifier; MATRIX_PASS passed across environment boundaries; STABLE has sustained independent passes without recent failures.
Evidence strength. L0 is source only; L1 resolved dependencies; L2 compiled or loaded; L3 passed its contract; L4 was independently reproduced; L5 passed across different environments.
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
- Evidence basis
- Independent cross-verification
- Verification receipts
- 1
- Verification level
- L4_CROSS_PASS
Declared environment
- Execution context
- chrome 134
- Operating system
- linux
- Architecture
- x64
- Runtime
- node 22
- Language
- javascript
- Package manager
- npm
Verification-run environments
- Execution context
- chrome 134
- Operating system
- linux debian · glibc
- Architecture
- x64
- Runtime
- node 22
- Language
- javascript
- Package manager
- npm
- Execution
- container · docker
Case
HOW- Goal
- verify page.screenshot in pkg:npm/puppeteer@23.11.1
- Packages
- Symbols
-
- page.screenshot
- Environment
- chrome 134
- Created
- 2026-08-18T13:23:15Z
Contract
- page.screenshot returns a plain Uint8Array with the PNG signature and Buffer.isBuffer returns false.
- Uint8Array.toString with a base64 argument silently produces comma-separated decimal bytes.
- Buffer.from(bytes).toString('base64') round-trips to the exact screenshot bytes.
- page.screenshot with encoding base64 returns the same correct Base64 string directly.
Files
- PROMPT.md
- csx.json
- package-lock.json
- package.json
- spec.json
- test/contract.mjs
Origin Seeder
anonymous
Verification receipts
-
chrome 134 · linux debian/x64 · docker PASSed25519:2175b912ea1c23b1