Stand up a public-chain seller reputation protocol where only verified buyers can post reviews and every rating carries portable, tamper-proof provenance. Provenance Notary, Soulbound Token, and a DID and VC Ledger anchor the record, so scores cannot be edited by the platform operator that hosts them.
Turn platform-controlled star ratings into buyer-owned, cross-platform reputation that cannot be manufactured.
01.
Bind every review to a settled order. The Provenance Notary requires a verified purchase receipt before a review can be written, so bought-and-paid-for review farms have nothing to attach to.
02.
Issue each buyer a non-transferable Soulbound Token that carries their review history. Reputation cannot be sold, transferred, or spun up in bulk from throwaway accounts.
03.
Compute one reputation score from reviews across every participating marketplace. A seller's honest track record follows them instead of resetting each time they list on a new platform.
04.
Remove the platform's ability to bury or boost. Scores are derived from on-chain reviews the operator cannot silently rewrite, so buyers trust a number the host does not control.
05.
Anchor buyer authenticity through the DID and VC Ledger. A verifiable credential proves a reviewer is a real, distinct human without exposing their personal identity to the public.
06.
Detect coordinated manipulation. Clustered timing, shared funding wallets, and review-swap rings surface against the shared ledger long before they distort a seller's public rating.
Follow a single buyer review from a verified purchase to a portable score any marketplace can trust.
07:41:02
[SYS] Initializing Reviewer Identity Manifest...
07:41:02
[CMD] issueCredential { buyer: "0x7c19", type: "HUMAN_UNIQUE" }
07:41:03
[AUTH] Binding soulbound reviewer token to DID...
07:41:03
[OK] Reviewer SBT_44120 minted, non-transferable.
Cerulea decomposes marketplace reputation into modular contracts. Each layer verifies identity, gates reviews behind purchases, aggregates cross-platform scores, and exposes them without a single operator in control.
Portable, purchase-gated reputation is a horizontal capability. Here is how different marketplace actors put the shared ledger to work.
Give shoppers a trust signal the house cannot inflate. Large multi-category platforms adopt purchase-gated reviews to prove listings are rated by real buyers, not by the operator or paid farms.
Key Asset Types
Let small sellers carry a hard-won reputation between platforms. A verified track record earned on one vertical marketplace transfers intact when a merchant expands to another.
Key Asset Types
Audit review integrity from evidence. Regulators query the ledger to confirm ratings are backed by real purchases and to trace manipulation rings without subpoenaing the platform.
Key Asset Types
Whether you are bridging an existing marketplace review database or capturing native wallet-signed reviews, Cerulea routes both into one shared reputation record.
For established e-commerce platforms with legacy review systems. Settled orders and existing reviews are translated into purchase-gated on-chain records through the API gateway automatically.
Legacy Marketplace DB
Order & Review Systems
Cerulea API Gateway
Purchase Hashing & Gating
Cerulea Public Chain
Shared Reputation Ledger
For wallet-native shoppers and Web3 storefronts. A verified buyer signs each review directly from their wallet and routes it to the reputation layer without a platform intermediary.
Buyer Wallet / dApp
Soulbound Reviewer Identity
Reputation Validators
Gated Review Consensus
Cerulea Ledger
Portable Score Record
Building a purchase-gated review protocol with soulbound identity, cross-platform scoring, and manipulation detection from scratch requires specialised engineers and long integration cycles. Calculate your exact deployment speed using Cerulea.
Traditional Deployment
Solidity Coding & Audits
~ 12 Months
Visual Compilation
WASM Logical Artifacts
~ 4 Weeks
The legacy timeline reflects marketplace platform engineering benchmarks. Building soulbound reviewer identity, wiring purchase-gating into checkout, and shipping a cross-platform scoring service for an average network takes a baseline of 8 months. Building the same architecture on Cerulea takes a baseline of 2 weeks, because Cerulea Studio visually translates your gating and scoring rules into pre-audited WebAssembly binaries and provisions the shared reputation ledger instantly.