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…-execution witness composing with base64url to mint credentials Pure-spec seam in std.bytes: random_bytes(count: Int) -> List<UInt8> uses pure_dag_seam_unreachable() as the §2 Realization REQUEST body — the .dag declares the entropy need, the host satisfies it. v1_interpreter handler reads exactly `count` bytes from /dev/urandom via std::io::Read::read_exact (no new dependency; Linux std I/O). Bounds-checked 0..=65536; zero-count path skips the open entirely. Witness (random_bytes_csprng_witness_test.dag, auto-enrolled by naming): - random_bytes_count_holds: count: 16 -> 16 octets (green) - random_bytes_zero_holds: count: 0 -> 0 octets (green) - random_bytes_base64url_mint_16_length_holds: 16 bytes -> 24-char UrlSafe string (green) - random_bytes_base64url_mint_20_length_holds: 20 bytes -> 28-char UrlSafe string (green) The last two witnesses prove the §2 horizontal composition: random_bytes ∘ base64_encode(variant: UrlSafe) mints a URL-safe credential string. Length is the discriminating claim (16 bytes = 5*3+1 -> 24 chars; 20 bytes = 6*3+2 -> 28 chars); a wrong-count handler or wrong alphabet fails both. dsl compile: 463 modules, 0 diagnostics. All 11 existing base64 witnesses still green by execution. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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