# Electronic Signature & Document Trust API

> Locally verify PDF signature structure, certificate chains, timestamps, tamper evidence, coverage, revocation lists, multi-signer audits, and evidence bundles—while distinguishing technical verification from legal enforceability.

- Product: https://www.brainiac.software/api/document-trust
- Docs: https://www.brainiac.software/api/document-trust/docs
- OpenAPI: https://www.brainiac.software/api/document-trust/openapi.json
- Contact: support@brainiac.software (https://www.brainiac.software/contact)

## Operations

- POST /api/v1/document-trust/pdf-digital-signature-verify — $0.05 USDC — Verify PDF digital signatures: Inspect PDF /Sig dictionaries and optional detached signatures locally. Technical verification is not legal enforceability. Docs: https://www.brainiac.software/api/document-trust/docs#document-trust-pdf-digital-signature-verify
- POST /api/v1/document-trust/signature-certificate-chain-validate — $0.04 USDC — Validate signature certificate chains: Parse supplied X.509 certificates and check validity windows and issuer links locally. Not a legal trust determination. Docs: https://www.brainiac.software/api/document-trust/docs#document-trust-signature-certificate-chain-validate
- POST /api/v1/document-trust/signature-timestamp-validate — $0.03 USDC — Validate signature timestamps: Check PDF /M timestamps and caller-supplied signer signedAt values against asOf and optional certificate windows. Docs: https://www.brainiac.software/api/document-trust/docs#document-trust-signature-timestamp-validate
- POST /api/v1/document-trust/signed-tamper-detect — $0.04 USDC — Detect signed-document tampering: Compare current PDF hashes and ByteRange digests to caller-supplied expectations. Missing expectations are not invented. Docs: https://www.brainiac.software/api/document-trust/docs#document-trust-signed-tamper-detect
- POST /api/v1/document-trust/signature-coverage-check — $0.03 USDC — Check document signature coverage: Measure ByteRange coverage over supplied PDF bytes for each signature field found locally. Docs: https://www.brainiac.software/api/document-trust/docs#document-trust-signature-coverage-check
- POST /api/v1/document-trust/signature-revocation-status-check — $0.03 USDC — Check signature revocation status: Compare certificate serials to caller-supplied revocation entries only. Live commercial OCSP/CRL networks are not queried. Docs: https://www.brainiac.software/api/document-trust/docs#document-trust-signature-revocation-status-check
- POST /api/v1/document-trust/contract-signed-version-match — $0.04 USDC — Match signed contract versions: Compare sha256 digests and version labels across supplied signed PDF copies. Differing hashes are reported, not invented. Docs: https://www.brainiac.software/api/document-trust/docs#document-trust-contract-signed-version-match
- POST /api/v1/document-trust/multi-signer-audit — $0.04 USDC — Audit multi-signer documents: List PDF signature dictionaries and caller-supplied signers per document. Technical listing is not legal enforceability. Docs: https://www.brainiac.software/api/document-trust/docs#document-trust-multi-signer-audit
- POST /api/v1/document-trust/evidence-bundle-build — $0.07 USDC — Build document evidence bundles: Bundle local signature, certificate, timestamp, tamper, coverage, and revocation checks with an explicit technical-vs-legal distinction. Docs: https://www.brainiac.software/api/document-trust/docs#document-trust-evidence-bundle-build
- POST /api/v1/document-trust/electronic-trust-report — $0.08 USDC — Build electronic document trust report: Aggregate local signature, chain, timestamp, tamper, coverage, revocation, version, and multi-signer findings. Distinguishes technical verification from legal enforceability. Docs: https://www.brainiac.software/api/document-trust/docs#document-trust-electronic-trust-report