Sample
crypto 3.0.7: Prove that Dart's Digest class retains a mutable reference to its backing byte list, uses reference identity for its bytes property comparison, and that AccumulatorSink only emits a digest upon closing.
Verified sample for pub crypto 3.0.7: Prove that Dart's Digest class retains a mutable reference to its backing byte list, uses reference identity for its…
sha256:f213c22f36b9db460dab426a0950706e154cf9bdf4562bacdbc8f9549b1a3f6c
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
- 2
Declared environment
dart linux x64 dart dart pub
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| dart 3 · linux debian/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-17 |
| dart 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-18 |
Case
HOW- Goal
- Prove that Dart's Digest class retains a mutable reference to its backing byte list, uses reference identity for its bytes property comparison, and that AccumulatorSink only emits a digest upon closing.
- Packages
- Symbols
-
- Digest
- Digest.bytes
- AccumulatorSink
- Hash.startChunkedConversion
- Environment
- dart
- Created
- 2026-08-17T02:04:59Z
Contract
- assert that a Digest constructed with a mutable List holds that list by reference, so modifying the list externally alters the Digest's bytes, its hex string representation, and its hash code
- assert that comparing raw byte lists of two identical Digest objects directly via the == operator evaluates to false due to Dart's list reference identity check, whereas comparing the Digest objects evaluates to true
- assert that AccumulatorSink remains empty when adding chunks via a chunked conversion sink and only receives a single Digest event when the sink is closed
- assert that calling add on a closed chunked conversion sink throws a StateError
Files
- NOTES.md
- csx.json
- pubspec.lock
- pubspec.yaml
- test/contract.dart