consider
Do you need it to live in the EU — really?
Not "in an EU region of a US hyperscaler", but in an EU-domiciled operator with EU staff and EU jurisdiction. Epher Cloud — or your own hardware on Epher Enterprise.
Compare
Our neighbours,
at a glance.
Most peers occupy a single point on the time axis or a single pillar. Epher Compute Chain covers the whole storage shelf — milliseconds to forever — and adds deterministic compute on the same wire, with one signature chain and one EU-domiciled operator. Below is the buyer's-view summary. The architectural deep-dive lives on the protocol site.
When you'd pick us
Three deciding questions.
consider
Do you need to prove it — to a regulator?
DORA, the AI Act, ICT-incident audit records: Epher Compute Chain is the durable end of the shelf, with PQC and inclusion proofs by default — and deterministic-compute receipts when the workflow itself needs auditing.
consider
Do you need the same primitive at both ends of the time axis?
Session state for a real-time app and a six-year audit log of the same workload, with one wire? That is the design.
Side by side
Where each system shines — and where it stops.
| System | Best for | Time horizon | EU sovereign | HW attestation | PQC | Token |
|---|---|---|---|---|---|---|
| Epher Compute Chain | EU compliance + agent state + audit + verifiable workflows | seconds → eternal | yes (operator) | HATP + KVM | Falcon (T3·T4) | none |
| MagicBlock (Solana ER) | Web3 gaming session state | seconds | — | TDX (announced) | — | none |
| Celestia / EigenDA / Avail | Rollup data availability | ~7 days | — | — | — | native |
| Filecoin | Bulk leased storage | months → years | — | SGX in places | — | FIL |
| Arweave | Permanent public storage | eternal | — | — | — | AR |
| Algorand state proofs | PQC chain anchoring | chain-eternal | — | — | Falcon | ALGO |
| EBSI (EU) | EU public-sector notarisation | years → eternal | yes | research | roadmap | none |
| QANplatform | EU-hosted PQC L1 | chain-eternal | hostable | — | Dilithium | CryptoQNT |
| In-house log + HSM | DIY audit trail | whatever you build | depends | depends | unlikely | n/a |
"—" means the system does not attempt that property; not a criticism, a scope statement. For the full architectural treatment of each peer, see ephernity.org/compare.
vs. roll-your-own
The build-vs-buy
that's worth doing the math on.
An append-only Postgres table + a hash chain.
A weekend's work — and a year of liabilities. No per-entry signatures, no offline verification, no PQC, no public-chain anchor, and a question mark over what "tamper-evident" means when the DBA can edit the table.
A self-hosted HSM + a Merkle library.
Closer — but the HATP-style delegation, the key rotation, the offline verifier, and the regulator-facing paperwork are all on you. Auditors will ask who measured the boot of the signing host.
Epher Compute Chain
A POST request, an inclusion proof, an offline-verifiable export, and a DPA you can sign on day one. The compute pillar adds deterministic Borz contracts with the same receipt format. Built once, audited once, billed per entry or per host depending on the edition.