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A coin you can hold.
A record you can follow.
Each certificate corresponds to one specific, individually identified coin held in the vault. Your rights to it are set out in the terms, and you can have the coin shipped to you.
Four moments.
One record.
The digital certificate follows the coin while it is in the vault. Shipping the coin home ends that certificate.
- 01Registered
A coin on the list
The coin is entered with its fingerprint: collection, design, metal and serial number. Its set’s list of coins is published on Base before the first sale.
- 02Active
A certificate in your wallet
At the coin’s first sale its set’s contract makes the certificate, numbered from the fingerprint. The coin stays in the vault while you hold it.
- 03Transferred
A sale, with your signature
On a resale, the seller signs the listing and the buyer signs the exact coin and price. The payment, the set’s split and the certificate move together in one transaction.
- 04Burned
The physical coin comes home
Shipping burns the certificate on Base before the coin is sent. The same token number can never be made again.
Clear rules.
Visible transactions.
Your wallet signature is part of the process. A transfer follows the certificate contract’s rules wherever that wallet is used.
- 01Consent
The holder signs every move.
Sales, gifts and openings need the holder’s own signature, and Bifrost co-signs. A marketplace button alone cannot move your certificate.
- 02Settlement
Payment and transfer go together.
The settlement contract takes the payment, pays each share of the set’s split and moves the certificate in one transaction. A failed transaction changes nothing.
- 03Transfers
The same rules in every wallet.
Standard ERC-721 transfers and approvals are refused. Exporting a wallet or connecting to another marketplace does not make the certificate freely transferable.
- 04Shipping
Shipping burns the token.
The certificate is burned before dispatch, and the same token number can never be made again. The coin’s page stays readable and shows the burn.
Know who is responsible for the physical coin.
Blockchain records do not establish an operator’s legal identity, custody duties, property rights or regulatory approval. Those depend on verified operator documents, the terms you accept and the applicable law.
Before relying on a service, review:
- The named legal entity and how to contact it.
- Custody, delivery, loss and dispute terms for your coin.
- Your property rights and what happens if the operator cannot continue.
- What happens if your coin is lost or damaged, and who carries that risk.
- The applicable legal classification and launch conditions for the product and your location.
This explanation is not a regulatory approval, a promise of cover against loss or a legal opinion on title. A token’s existence does not verify those documents.
Before you make it yours.
Can I send a certificate anywhere, like an ordinary token?
No. Each certificate uses the ERC-721 format, but it moves only through Bifrost’s settlement contract, with the holder’s signature: ordinary transfers and token approvals are refused. Exporting a wallet’s key does not change that.
What actually happens when I buy a coin?
Your wallet signs the exact coin and price, and Bifrost co-signs the sale. The settlement contract then takes the payment, divides it by the set’s split and makes or moves the certificate, all in one transaction. If any part fails, none of it happens. The site marks the order complete only after it has checked the transaction on Base.
What is a Proof of Integrity number?
A certificate’s token number is calculated from its coin’s fingerprint (collection, design, metal and serial number) together with a secret random number. The number belongs to that one coin: the contract makes it only once, even after the coin is shipped home, and it cannot be guessed in advance.
Why one contract per set?
Each set and each sealed pack run has its own certificate contract. Its list of coins is published on Base before the first sale, and the contract makes certificates only for coins on that list, never more. The set’s minimum price and its split belong to that contract.
How do sealed packs work?
A sealed pack run has its own contract, with one numbered token per pack. Which coin each pack holds was fixed and committed on Base before the first sale, and it stays hidden until the pack is opened. Only the pack’s current holder can open it, and the opening proves on Base which coin was inside. A sealed pack can be kept, sent or sold sealed, but it is never shipped.
What changes when I choose delivery?
You review the address and the shipping charge before you approve. Your approval burns the certificate on Base, and the coin is sent only after the burn is final. The coin’s page stays readable and shows the certificate as burned.
Do I lose the coin’s history or its paper certificate?
The historical record and the burn transaction remain available after the certificate is burned. A physical certificate of authenticity, grading slab or mint document is a separate item: its presence and delivery must be recorded for that particular coin. A blockchain certificate does not create a missing paper document or replace a grading opinion.
Read the record for yourself.
Check a coin’s contract, its current status, where it is held and its transaction history.