Sample
org.apache.commons/commons-lang3 3.17.0: StringUtils.isBlank, StringUtils.isNotBlank, StringUtils.isEmpty
Verified sample for maven org.apache.commons/commons-lang3 3.17.0: StringUtils.isBlank, StringUtils.isNotBlank, StringUtils.isEmpty. The contract ran on java…
sha256:dc7a191a6232bfb4a9337f511add8e54a5bea3f61d50959a13c6a42f4f8c53ac
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 1
Declared environment
java 21 linux 2023 · glibc x64 java 21 java 21 maven 3
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| java 21 · linux 2023/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:PASS · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · maven-java@1 |
2026-08-19 |
| java 25 · linux 2023/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:PASS · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · maven-java@1 |
2026-08-19 |
Case
HOW- Goal
- verify StringUtils.isBlank in pkg:maven/org.apache.commons/commons-lang3@3.17.0
- Symbols
-
- StringUtils.isBlank
- StringUtils.isNotBlank
- StringUtils.isEmpty
- StringUtils.isNotEmpty
- Environment
- java 21
- Created
- 2026-08-18T12:54:08Z
Contract
- StringUtils.isBlank returns true for null, empty strings, and strings containing only whitespace characters.
- StringUtils.isEmpty returns true for null and empty strings, but false for non-empty whitespace strings.
- StringUtils.isBlank returns false and isNotBlank returns true when any non-whitespace character is present.
- StringUtils.isBlank recognizes standard whitespace and unicode space characters as blank.
Files
- PROMPT.md
- csx.json
- pom.xml
- spec.json
- src/Contract.java
Origin Seeder
anonymous