An honest comparison, not a sales pitch. Sourced only from each alternative's own public documentation, current as of when this page was written — verify against their current docs before relying on any specific claim below. If we've gotten something about a competitor wrong, open an issue.
| Plain application logs | Roll-your-own hash chain | ActaSeal | |
|---|---|---|---|
| Tamper-evidence | None — a log line can be edited or deleted with no trace. | Possible if built correctly, but this is exactly the kind of primitive that's easy to get subtly wrong (chain-start binding, replay attacks, torn-write recovery) without dedicated engineering investment. | Built-in: hash-chained ledger, verified via actaseal.ledger.events.verify_event_chain, with torn-write recovery tested against real crash scenarios. |
| Independent witness (can't be backdated by the signer) | No. | Only if you separately build RFC 3161/transparency-log integration — most DIY chains don't. | Built-in: RFC 3161 TSA anchoring with multi-provider failover, transparency-log inclusion proofs. |
| Offline, zero-trust verification by a third party | No — requires trusting whoever holds the logs. | Depends entirely on whether you ship a standalone verifier alongside the chain — most internal tools don't. | Yes: a zero-dependency-beyond-cryptography standalone verifier ships inside every packet as verify.py (generated from the product's offline_verifier.py; this repository publishes the same verifier for independent review). |
| Legal admissibility posture (FRE 901/902-style chain of custody) | No structured support. | Not typically built — this is specialized, not a byproduct of a hash chain alone. | Built-in: acquisition report, chain-of-custody doc, authentication statement in every dispute packet. |
| Policy-decision gate (block/require-approval before an action executes) | No — logs are after-the-fact. | No — a hash chain alone doesn't gate anything. | Yes — this is ActaSeal's core function; the ledger records the gate's own decisions, it doesn't replace them. |
| Setup cost | Lowest — usually already exists. | Real engineering investment to build correctly and keep correct. | A real dependency to adopt and operate — not free, but the tamper-evidence/witness/admissibility/verifier work is already done. |
If you don't need independent-witness tamper-evidence or a policy-decision gate — e.g. internal debugging, non-disputed operational telemetry — plain logs are simpler and cheaper, correctly. ActaSeal is built for the specific case where an agent's money-touching action needs a decision that can be independently verified later, possibly in a dispute or audit context.