Collect
Source, unit, knowledge time
CBAM + Türkiye ETS evidence infrastructure
Not the calculation, the proof of it, standardised
DAHLIA does not run your calculation. It makes the declared figure defensible to the accredited verifier, your EU customer and later auditors.
No sign-up · The sample's seal is recomputed in your browser
The evidence chain
A number never arrives alone
- Six columns, one root
- Nodes from the package
- Link breaks, seal fails
Live evidence chain
4.97 tCO₂e — trace its source.
Change it — the seal recomputes.
- Seal root
- — Computing the seal…
Node labels are sealed bytes. translation
Reading the package…
Tap a node.
Seal format
The seal in numbers
- 4leaves · each calculation sealed separately
- 2reference implementations · byte-for-byte same root
- 30golden vectors · re-checked every release
- RFC 3161timestamp · independent time authority
Risk
An audit questions the chain, not the calculation
The figure may be correct. The spreadsheet changed, the person left, the certificate vanished.
How it works
declaration
+1
+2
+4
+5 · audit
Scattered archive
folders, email, spreadsheets
Figure and spreadsheet
Person who calculated
Old factor table
Calibration certificate
Chain unrecoverable
DAHLIA package
sealed record
Figure, data, method
Reasons in ledger
Method version sealed
Document and digest
Same root, reproduced
Calculate
Methodology as versioned data
Seal
Four leaves, one root
Continuity
Evidence that does not depend on a DAHLIA server
The package carries method and data
- That day's method
- That day's data
- Without our server
2027
sealed
2032
recomputed
- methodologyHash
- inputSetHash
- lineageHash
- sourcesHash
root
13901e…4ffa1c
missing source
The seal check runs in your browser
Roles
One chain, four mandates
Operator
Collects, calculates, seals
Accredited verifier
Reads, reviews, signs
EU importer
Verifies the package separately
Auditor
Reproduces the root
Build the next report while the data is collected
One facility, one figure, sealed.