Sample
base64 0.3.0: Encode and decode Base64 distinguishing RFC 2045 line-wrapped MIME format from RFC 4648 strict single-line tokens and unpadded URL-safe strings
Verified sample for gem base64 0.3.0: Encode and decode Base64 distinguishing RFC 2045 line-wrapped MIME format from RFC 4648 strict single-line tokens and…
sha256:f8db5d5b06642ffab3e5fd90c8bf484d652b28d5bc690cc868c1e72b578d0f82
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
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 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1 |
2026-08-18 |
Case
HOW- Goal
- Encode and decode Base64 distinguishing RFC 2045 line-wrapped MIME format from RFC 4648 strict single-line tokens and unpadded URL-safe strings
- Packages
- Symbols
-
- Base64.encode64
- Base64.strict_encode64
- Base64.decode64
- Base64.strict_decode64
- Base64.urlsafe_encode64
- Base64.urlsafe_decode64
- Environment
- ruby
- Created
- 2026-08-16T09:01:39Z
Contract
- assert Base64.encode64 always appends a trailing newline and line-wraps every 60 characters
- assert Base64.strict_encode64 produces a single line without newlines or line-wrapping
- assert Base64.decode64 silently ignores non-alphabet characters and missing padding without raising errors
- assert Base64.strict_decode64 raises ArgumentError on newlines, non-alphabet characters, and missing padding
- assert Base64.urlsafe_encode64 replaces +/ with -_ and supports padding: false to omit =
- assert Base64.urlsafe_decode64 decodes both padded and unpadded URL-safe strings while rejecting + and /
- assert Base64 decode methods always return ASCII-8BIT binary encoded strings
Files
- Gemfile
- Gemfile.lock
- NOTES.md
- csx.json
- test/contract.rb