Anyone using blockchain for 'proof nothing got modified' logging?

I’m exploring whether blockchain could be a practical solution for creating tamper-proof system logs, mainly for compliance and audit-readiness. The idea is to ensure that once logs are written, there’s an immutable, verifiable trail that proves nothing was modified or deleted.

I understand the underlying theory, hash chaining, decentralized verification, append-only records, etc. but I’m really interested in hearing from people who have actually implemented this in a real business environment. Did integrating blockchain into your logging or SIEM pipeline actually work in production? How was performance, operational overhead, and cost?

Did you end up using a public chain, a private ledger, or something hybrid? And most importantly, was it reliable and compliant, or did it turn out to be slow, complex, or not worth the effort?

Any real-world feedback or lessons learned would be super helpful.