verifier-stack

Verifier Stack

OloLand's verifier stack mechanically checks that every number in an artifact is supported by the deal's source documents, that every citation marker points at a real retrievable chunk, and that the deal's stored DCF identities hold. It is the "defend every number, cite every source" guarantee in code, not in marketing copy.

What the verifiers actually do

verify_inline_numbers

Extracts every dollar amount and every percentage from the artifact text. For each number, checks whether it appears (within 5% relative / 0.5pt absolute tolerance) in at least one chunk retrieved from the deal corpus.

• Catches: fabricated revenue figures, transposed digits (e.g. $34.2M vs $32.4M), unit drift ($304K reported as $304M).
• Misses: numbers that happen to appear in the corpus by coincidence (e.g. a generic "$1M" mentioned in a risk factor section); numbers that are derived but never raw in the source (e.g. growth rates the analyst computed correctly but the chunk only shows the underlying revenues).

verify_claim_chunks

Stricter than verify_inline_numbers. Splits the text into sentences containing financial numbers. A sentence passes only when all of its numbers can be matched in a single chunk.

• Catches: sentences that stitch together unrelated numbers from different sources (a tell for hallucinated synthesis).
• Misses: the same coincidence cases as above.

verify_citation_existence

For artifacts that use the legacy [Source: file=..., p.N] block format: extracts every block and validates that the filename exists in the deal's document set (with fuzzy matching) and the cited page is in range.

• Catches: invented filenames, wrong page numbers.
• Skipped: when the artifact uses the modern [N] marker format only — that's audited by check_citation_coverage.

verify_dcf_arithmetic

Replays the two DCF identities against the deal's most recent DCFRun:

1. enterprise_value == pv_fcf_sum + pv_terminal_value
2. equity_value == enterprise_value - net_debt