Investigation Evidence Management

Overview#

In a financial crime prosecution, evidence admissibility can hinge on a single question: can you prove this document has not been altered since it was collected? Chain of custody failures have derailed investigations that took years to build. The Evidence Management module is designed so that question is always answerable. Every access, every annotation, every transfer is captured with cryptographic signatures, creating a tamper-proof record that holds up in court, before regulators, and under cross-examination.

The system handles the full spectrum of evidence encountered in financial crime, law enforcement, and corporate investigations: blockchain transaction records, bank statements, communications, forensic artifacts, surveillance data, third-party intelligence, and physical evidence metadata. Multi-jurisdictional cases with hundreds of evidence items are managed in a single, searchable repository with automated retention controls tied to regulatory requirements.

Key Features#

Multi-Format Evidence Ingestion: Supports a wide range of file formats with automated classification, metadata extraction, integrity verification, and duplicate detection.
Cryptographic Chain of Custody: Every evidence access, modification, transfer, and analytical operation is recorded with cryptographic signatures, providing tamper-proof audit trails for legal proceedings.
Evidence Linking and Relationship Mapping: A graph-based discovery engine identifies relationships between evidence items across investigations, enabling analysts to uncover connected criminal networks and track fund flows across cases.
Intelligent Search and Retrieval: Full-text search with AI-powered relevance ranking, metadata filtering, faceted navigation, saved searches, and natural language query support delivers rapid evidence discovery.
Multi-Tier Storage Architecture: Automated storage tiering optimises costs by migrating infrequently accessed evidence to appropriate storage levels while maintaining rapid access for active investigations.
Evidence Cataloging and Metadata Management: Maintains comprehensive structured metadata per evidence item with automated extraction, manual annotation workflows, and AI-powered enrichment.
Legal Hold Management: Automated retention management with configurable policies based on investigation status, evidence type, jurisdiction, and regulatory requirements, with legal hold flags preventing premature deletion.
Bulk Evidence Operations: Supports batch imports, bulk tagging, mass reclassification, and batch export for efficient large-scale evidence handling.
Cross-Investigation Evidence Discovery: Searches across all investigations with appropriate access permissions, enabling analysts to identify shared evidence and build comprehensive cases.

Use Cases#

AML Investigation Evidence Assembly: Compliance teams collect and organise blockchain transaction records, bank statements, communications, and third-party intelligence into structured evidence packages with complete chain of custody documentation.
Court-Ready Evidence Packages: Automated chain of custody tracking and cryptographic verification ensure evidence admissibility in legal proceedings, with complete audit trails satisfying regulatory and legal standards. This includes preparation of evidence for Irish courts and prosecution file requirements.
Cross-Case Evidence Linking: Evidence relationship discovery connects items across investigations, revealing shared wallets, counterparties, and transaction patterns that expand investigation scope.
Regulatory Examination Preparation: Evidence cataloging and search capabilities enable rapid retrieval of investigation documentation for regulatory audits and compliance examinations.
Multi-Jurisdictional Case Coordination: Secure evidence sharing with custody transfer workflows supports collaboration across organisational boundaries with dual-approval controls.
Long-Term Evidence Retention: Automated retention policies with tiered storage ensure compliance with regulatory preservation requirements while managing storage costs.

Integration#

The Evidence Management module integrates with the investigation platform's case management, workflow, and reporting systems. Evidence counts and summaries appear on investigation dashboards, evidence timelines visualise chronological acquisition, and investigation closure checks ensure retention policies are applied. The module connects to external systems including document management platforms, blockchain analytics tools, and email systems for automated evidence acquisition.

Open Standards#

W3C Verifiable Credentials Data Model v2.0: Every evidence item can have a signed Verifiable Credential issued against it, using an Ed25519 key and a did:web issuer identifier, to provide cryptographically verifiable provenance and custody-transfer records for legal proceedings.
RFC 3161 (Internet X.509 PKI Time-Stamp Protocol): Evidence exports are timestamped by a trusted Timestamping Authority using full RFC 3161 ASN.1-encoded timestamp tokens, enabling courts and regulators to prove that an artefact existed and was unaltered at a specific point in time.
ISO 19005 (PDF/A): Court-ready evidence packages can be rendered in PDF/A-1B, PDF/A-2B, PDF/A-3B, or PDF/A-4F archival variants, ensuring long-term readability and admissibility under jurisdictions that mandate ISO archival formats.
SHA-256 (FIPS 180-4): A SHA-256 digest is computed and stored for every ingested evidence file, forming the basis of integrity verification, duplicate detection, and the Merkle-tree audit chain.
W3C Decentralised Identifiers (DID) Core: Verifiable Credential issuers are identified via did:web identifiers, allowing verifiers to resolve the public key without relying on a centralised certificate authority.
ISO 4217 (Currency Codes): Financial transaction evidence records use three-letter ISO 4217 currency codes, ensuring interoperability with banking, AML, and regulatory reporting systems.
Exchangeable Image File Format (EXIF / CIPA DC-008): Image evidence is parsed for embedded EXIF metadata including capture timestamps, GPS co-ordinates, and camera provenance, which are indexed and preserved alongside the evidence record.
GraphQL: All evidence queries, mutations, chain-of-custody operations, and Verifiable Credential interactions are exposed through a typed GraphQL API, enabling structured integration with investigation dashboards, case management, and third-party tooling.

Last Reviewed: 2026-02-05 Last Updated: 2026-04-14