Data layers (Vision recap)
5.1 Data layers (Vision recap)
The Vision Paper defines four data layers; this section maps each to concrete storage and shows what is queryable from what.
| Layer | What lives here | User access | Operations access | B2B access |
|---|---|---|---|---|
| Device | Original receipt image | Own data | Device scope | Device scope |
| Hot system | Receipt records, line items, last 90 days | Own data | Operational | Aggregate layer |
| Warm system | Same as hot, 91 days-3 years | Own data | Operational | Aggregate layer |
| Anonymised aggregate | k-anonymous panels and indices | Aggregate view | Operational | Aggregate view |
| On-chain summary | bINT credit hashes, INT events, NFT levels | Public | Public | Public |
The strict rule: the anonymised aggregate is separated from single-user records. 5.8 specifies the transformation.