ISO 27001 certification is increasingly required by European banks and financial institutions before vendor onboarding. The 2022 revision (ISO 27001:2022) makes logging requirements more prescriptive than SOC 2.
European fintech buyers default to requiring ISO 27001 rather than SOC 2
Annex A.8.15 (Logging) and A.8.16 (Monitoring) are evaluated against documented evidence — not just policy
A.8.17 (Clock synchronization) and A.8.18 (Privileged utility programs) require specific log entries
ISO 27001 surveillance audits happen annually — log integrity must be maintained continuously
ISO 27001 is the international standard for information security management systems (ISMS). The 2022 revision reorganized controls into four themes: Organizational, People, Physical, and Technological. Audit logging falls primarily under Annex A control A.8.15 (Logging) and A.8.16 (Monitoring activities). Organizations must produce logs, protect them from tampering, and review them regularly. ISO 27001 certification is recognized globally and increasingly required for cross-border business.
Retention requirement: Organization-defined, typically 1-3 years (must align with risk assessment)
All user account lifecycle events
All privileged access and admin actions
All security policy violations
All security incident detection events
All change management approvals
Produce, store, protect, and analyze logs that record activities, exceptions, faults, and information security events. Logging facilities and log information must be protected against tampering and unauthorized access.
AuditKit: Immutable hash chain logging with cryptographic tamper detection
Networks, systems, and applications must be monitored for anomalous behavior. Appropriate actions must be taken to evaluate potential security incidents.
AuditKit: SIEM streaming enables real-time anomaly detection and alerting
Processes for acquisition, use, management, and exit from cloud services must include logging and monitoring requirements.
AuditKit: Multi-tenant isolation ensures cloud audit data is properly segregated
Information stored in systems and devices must be deleted when no longer required. Deletion events must be logged.
AuditKit: Structured event logging captures data lifecycle events including deletion with full context
SHA-256 hash chains and Merkle tree proofs provide mathematical proof that audit records have not been altered. This is increasingly the standard mechanism for satisfying ISO 27001 log-integrity requirements — assessors no longer accept policy-only controls.
Fintech platforms typically serve multiple customers from shared infrastructure. AuditKit enforces strict tenant isolation at the infrastructure level — your customers' audit data is logically separated, satisfying data segregation requirements common in ISO 27001 assessments.
Stream audit events to Splunk, Datadog, Elastic, or any SIEM your security team uses. ISO 27001 increasingly requires real-time monitoring, not just retained logs — AuditKit ships native streaming with at-least-once delivery semantics.
The AuditKit React viewer gives ISO 27001 auditors a clear interface for evidence review — filtered queries, integrity verification UI, and exportable evidence packages. Cuts auditor request cycles by 60-80% in typical engagements.
ISO 27001:2022 contains 93 controls organized into 4 themes (reduced from 114 in the 2013 version)
Control A.8.15 explicitly requires protection of logs against tampering
Certification requires annual surveillance audits and recertification every 3 years
Over 70,000 organizations worldwide hold ISO 27001 certification
It depends on your buyer geography. US enterprises overwhelmingly require SOC 2. European and APAC enterprises overwhelmingly require ISO 27001. Many fintech companies serving both markets pursue both — and the audit logging infrastructure is largely the same.
ISO 27001 Annex A control A.8.15 requires organizations to produce, store, protect, and analyze logs recording activities, exceptions, faults, and security events. Logs must be protected from tampering and unauthorized access. AuditKit provides cryptographic tamper protection through SHA-256 hash chains and Merkle tree proofs.
Fintech companies need comprehensive logging of financial transactions, user authentication, KYC/AML activities, permission changes, and system access. Logs must be tamper-proof (PCI DSS 10.5), retained for 5-7 years (SOX/DORA), and available for real-time monitoring (BSA/AML). AuditKit provides all of these capabilities with SHA-256 hash chains and Merkle tree proofs.
Fintech buyers (banks, payment processors, brokerages) require SOC 2 Type II before onboarding any third-party vendor handling financial data. For fintech SaaS, SOC 2 is the price of admission to enterprise revenue.
PCI DSS Requirement 10 is non-negotiable for any fintech that touches cardholder data. v4.0 (effective March 2024) raised the bar on log integrity — hash-based tamper detection is now explicitly required.
SOX Section 404 internal controls evaluation applies to any fintech vendor whose services touch a publicly-traded company's financial reporting. If your fintech sells to public companies, your audit logs are part of their SOX scope.
DORA (Digital Operational Resilience Act) became enforceable in January 2025 across the EU. It mandates ICT risk management and operational resilience evidence for financial entities — including non-EU vendors serving EU financial customers.
ISO 27001 is the global baseline for healthcare information security. European, Canadian, and APAC hospital systems often require it instead of (or in addition to) HIPAA.
Universities, especially in Europe and the UK, require ISO 27001 from edtech vendors handling student data. Cyber Essentials Plus (UK) and ISO 27018 (cloud privacy) often layer on top.
Tamper-proof audit trails that satisfy ISO 27001 requirements out of the box. Start from $99/mo.