Sample
base64 0.3.0: Decode URL-safe Base64 strings using urlsafe_decode64 instead of decode64 which silently discards '-' and '_' characters without raising
Verified sample for gem base64 0.3.0: Decode URL-safe Base64 strings using urlsafe_decode64 instead of decode64 which silently discards '-' and '_'…
sha256:81ce820b46b76175a5a699c7edace6578b3b420e18908f4a13671bdb2f5d74ed
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
ruby linux x64 ruby ruby bundler
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| ruby 3 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1 |
2026-08-16 |
| ruby 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1 | SKIPPED | compile:SKIPPED · contract:SKIPPED · load:SKIPPED · resolve:FAIL CONTAINER_RUN · rubygems@1 |
2026-08-18 |
Case
HOW- Goal
- Decode URL-safe Base64 strings using urlsafe_decode64 instead of decode64 which silently discards '-' and '_' characters without raising
- Packages
- Symbols
-
- Base64.decode64
- Base64.urlsafe_decode64
- Base64.encode64
- Base64.strict_encode64
- Base64.strict_decode64
- Environment
- ruby
- Created
- 2026-08-16T09:04:34Z
Contract
- assert Base64.decode64 silently discards '-' and '_' characters, corrupting payloads without raising an error
- assert Base64.urlsafe_decode64 correctly decodes URL-safe payloads containing '-' and '_'
- assert Base64.encode64 appends a trailing newline, causing Base64.strict_decode64 to raise ArgumentError
- assert Base64.strict_encode64 produces single-line encoded strings without newlines
- assert Base64.urlsafe_decode64 decodes unpadded URL-safe strings where Base64.strict_decode64 raises ArgumentError
- assert Base64.urlsafe_decode64 rejects inputs containing embedded newlines
Files
- Gemfile
- Gemfile.lock
- NOTES.md
- csx.json
- test/contract.rb