· Jiko Art
Art provenance certificates: a complete guide
TL;DR — Provenance is the foundation of the art market. For every sale, Jiko Art issues a certificate based on SHA-256 fingerprints — no blockchain, no NFT, no cryptocurrency — stable, verifiable, and publicly accessible.
Why provenance is critical
An artwork only has value if its origin, authorship and ownership history are established. Without provenance, the work is suspected of being fake, looted, or fenced. Major auction houses refuse to present a piece whose provenance chain has a gap of more than a few decades.
Three questions must always be answerable: Who made this? When? Who has owned it since?
Historical methods
- Paper certificate signed by the artist — the oldest form, easily forged or lost.
- Studio photograph — proof of a given date, but says nothing about successive owners.
- Ownership ledger — register kept by the gallery or dealer, opaque to the public.
- Catalogues raisonnés — academic reference, but limited to established artists and expensive to compile.
Digital methods
Three modern approaches exist for guaranteeing an artwork’s authenticity and traceability:
- NFT (non-fungible token on a blockchain). A token is issued on a public blockchain. Pros: public traceability of ownership changes. Cons: gas fees, dependence on a specific network, exposure to crypto speculation, legal complexity, debated energy footprint.
- Cryptographic hashing without a blockchain. A SHA-256 fingerprint of the image and metadata is stored in an append-only registry with timestamping. Pros: free, simple, legally clear, independent of any cryptocurrency. Limit: no peer-to-peer transfer of the certificate without an intermediary.
- Blockchain anchoring + centralised database. The hash is computed off-chain, then periodically anchored on a public blockchain as date proof. More complex to implement.
How Jiko Art does it
Jiko Art uses the cryptographic-hashing-without-blockchain approach. On every sale, three fingerprints are computed and stored permanently:
- Image hash (SHA-256) — fingerprint of the canonical image of the artwork. Any later edit of the file would produce a different hash.
- Metadata hash (SHA-256) — fingerprint of the metadata: title, artist, dimensions, materials, year, technique.
- Global hash (SHA-256) — combined fingerprint of both, proving the complete state at sale time.
The certificate is append-only: no field is ever modified after issuance. It is served at a stable URL (/registry/[publicId]) and can be verified by anyone by re-computing the hashes from the published data.
NFT vs hashed certificate: comparison
| Criterion | NFT | Hashed certificate (Jiko Art) |
|---|---|---|
| Image integrity proof | Indirect (URI) | Direct (SHA-256 hash) |
| Transaction fees | Variable gas fees | None |
| Speculative exposure | High (cryptocurrencies) | None |
| Ownership transfer | On the blockchain | Off-platform, standard document |
| Tech dependency | Network and wallet required | Public URL, no dependency |
| Environmental footprint | Varies by network | Negligible |
How to verify a Jiko Art certificate
- Open the certificate’s public URL (
/registry/[publicId]). - Read the three fingerprints (image, metadata, global).
- Re-compute the SHA-256 hash of the source image file.
- Re-compute the metadata hash in canonical order.
- Compare: if the hashes match, the artwork and its metadata are identical to the recorded state.
Frequently asked questions
What is a provenance certificate?
A provenance certificate is a document that establishes the origin, authorship and ownership history of an artwork. It serves as proof of authenticity and travels with the artwork through every resale.
Is the Jiko Art certificate an NFT?
No. Jiko Art uses a cryptographic certificate based on SHA-256 fingerprints (image hash, metadata hash, global hash) stored in an append-only database. No blockchain token is issued or exchanged. There is no cryptocurrency, no gas fees, no speculative angle.
Why not use a blockchain?
The art market does not need a public, worldwide ledger to prove origin — it needs verifiable cryptographic proof that is stable over time. SHA-256 hashing guarantees integrity without the costs, energy volatility, and legal complexity of public blockchains.
How do I verify a certificate?
Every Jiko Art certificate is publicly accessible at a stable URL (/registry/[publicId]). Any visitor can verify that the fingerprints match the displayed image and metadata: if any data is modified afterwards, the hash differs.
What does the certificate contain?
The certificate contains the SHA-256 hash of the canonical image of the artwork, the SHA-256 hash of the metadata (title, artist, dimensions, materials, year), a global hash combining both, and the sale information (buyer, artist, NGO, price, date).
Is the certificate legally enforceable?
The certificate constitutes dated, signed evidence that can be submitted in case of dispute. Its final probative force depends on the local legal context and on the quality of the timestamping.