Question 1

What is ProofLedger and who is it for?

Accepted Answer

ProofLedger is a pre-loss evidence documentation platform. It creates a cryptographic, blockchain-anchored record that proves a file existed in a specific state at a specific moment in time — before any dispute, claim, or incentive to alter it arises. It's used by legal teams, insurance adjusters, property owners, and anyone who needs tamper-evident contemporaneous records.

Question 2

Is my file uploaded to ProofLedger's servers?

Accepted Answer

No. Your file never leaves your device. The SHA-256 fingerprint is computed locally in your browser, and only that 64-character hash is sent to ProofLedger for anchoring. No file content is ever transmitted, stored, or accessible to ProofLedger or any third party.

Question 3

How does SHA-256 hashing work?

Accepted Answer

SHA-256 is a one-way cryptographic function that converts any file — regardless of size — into a deterministic 64-character fingerprint. The same file always produces the same fingerprint. Changing even a single bit produces a completely different result. This makes it impossible to alter a file after recording without that change being immediately detectable during verification.

Question 4

How long does blockchain anchoring take?

Accepted Answer

Polygon anchoring usually completes within a minute or two of recording; the proof shows the transaction id as soon as it lands. If the signing service is briefly unreachable the proof stays pending and is retried automatically. Bitcoin anchoring was discontinued on October 15, 2026; proofs anchored on Bitcoin before then keep that record on their certificate.

Question 5

Can I verify a proof without a ProofLedger account?

Accepted Answer

Yes. The Verify page is fully public and requires no account, login, or payment. Anyone — including opposing counsel, insurers, or judges — can independently verify any Proof ID or file fingerprint at any time. This is a core design principle: verification must never depend on a relationship with ProofLedger.

Question 6

What does "Verification Passed" mean?

Accepted Answer

"Verification Passed" means three things were independently confirmed: (1) the file's SHA-256 fingerprint matches the hash anchored on-chain at the time of recording; (2) the on-chain anchor is confirmed in a finalized block on Polygon; and (3) the certificate's Ed25519 signature is valid against ProofLedger's published public key. All three must pass for the result to show "Verified."

Question 7

How can I verify a proof offline, without using ProofLedger?

Accepted Answer

Install the open-source verify-proof Python package (pip install verify-proof). It reads the certificate JSON, recomputes the file's fingerprint locally, and walks the Merkle path from that fingerprint to the anchored root — with no dependency on ProofLedger's infrastructure. This is specifically designed so that opposing counsel or auditors can verify records independently.

Question 8

Are ProofLedger certificates legally admissible?

Accepted Answer

ProofLedger produces contemporaneous, tamper-evident records designed to support admissibility as business records under rules like FRE 803(6) and similar standards. However, legal admissibility depends on the specific jurisdiction, proceeding, and how the evidence is presented. ProofLedger does not provide legal advice. For high-stakes matters, consult qualified legal counsel about how to introduce blockchain-anchored records in your jurisdiction.

Question 9

How do I upgrade or downgrade my plan?

Accepted Answer

You can change your plan at any time from the Billing section of your account dashboard. Upgrades take effect immediately and are prorated. Downgrades take effect at the end of the current billing period. Recording credits from a higher-tier plan are not carried over upon downgrade.

Question 10

What is your refund policy?

Accepted Answer

Subscription fees are non-refundable except where required by law. If you cancel during a trial period, you will not be charged. For annual plans, refund requests submitted within 14 days of renewal may be considered on a case-by-case basis — contact support with your order details.

Question 11

How do I get an API key and authenticate requests?

Accepted Answer

Create a key on your account page. Keys start with sk_ and are shown once, so copy yours when it appears. Pass it as a Bearer token in the Authorization header of every request: Authorization: Bearer sk_.... Every plan includes API access, and each proof created through the API counts toward your plan's monthly API limit; there are no separate test keys. Full reference: proofledger.io/api.html.

Question 12

What are the API rate limits?

Accepted Answer

API proofs are limited per month by plan: 100 on Free, 1,000 on Developer and 10,000 on Platform (see the pricing page). On Developer and Platform, proofs past the allowance keep working at $0.01 each; on Free they are refused until the 1st. The API takes one hash per request, or up to 100 in a batch call. Public verification by hash is limited per IP address per hour. For more than 10,000 a month, email sales@proofledger.io.

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