The first platform where both sides of every transaction build a verifiable, portable reputation. Cryptographically signed. Impossible to fake.
Every review platform today is one-directional, centrally controlled, and trivially gamed.
Buyers review sellers. Nobody reviews buyers. Contractors can't check if a client pays on time, communicates clearly, or has a history of disputes.
Reviews are text in a database. Platforms write them, delete them, curate them. There is no mathematical proof that any review is authentic.
Your 5-star rating on one platform means nothing on another. Reputation is siloed, non-portable, and owned by the platform — not by you.
Anyone can leave a review. No existing platform requires proof that a real transaction occurred between reviewer and reviewee.
Both parties sign. Both parties review. Neither can deny it. Nobody can alter it.
Normal signup by email. Behind the scenes, SigBond generates a cryptographic keypair on the Nostr protocol. Your public key is your identity. You never see the cryptography.
At the point of agreement, both parties confirm the transaction on SigBond. This dual cryptographic attestation proves a real transaction occurred between two identified parties.
Both parties write their reviews independently. Reviews are held in escrow — neither can see the other's until both commit. No retaliation bias. Honest by design.
Reviews publish as signed Nostr events with mathematical proof of authorship, timestamp, and transaction link. Permanent, distributed, tamper-proof.
Users pay in pounds by card. The backend converts to a Lightning Network micropayment via Strike API, producing a cryptographic receipt as additional proof. No crypto knowledge needed.
Each verified transaction builds a trust score — for businesses and individuals. Embed it, share it, or let third parties query it via API. Your reputation follows you.
Not better reviews — provable ones.
Not an add-on. The entire system is built around mutual review. Both parties must participate. Both build reputation. The asymmetry ends here.
Every review is a signed Nostr event. Public key proves authorship. Timestamp proves when. Transaction link proves it happened. No trust required in the platform itself.
Fabricating a SigBond review requires two independent cryptographic identities co-signing a transaction. Trustpilot removed 4.5M fakes in 2024. SigBond makes them architecturally impossible.
Your Nostr keypair works on any compatible service. Your reputation isn't locked to SigBond. If we disappear, your trust score survives on distributed relays.
Walk through the complete SigBond flow — from keypair generation to cryptographic publication. Real cryptography, working in your browser.
Launch Interactive Demo →