01 / Current data and publication status
The source snapshot and live-publication state are separate records. A reconstructed chart can be available while the publisher is not yet configured. The panel below identifies what this deployment is serving.
Each published fixing has its own record ID and canonical SHA-256 hashes for the accepted dataset and upstream response. These identifiers let a reader retrieve the same inputs later. They do not prove an independent audit or a guaranteed time of publication.
| Dataset SHA-256 | 66f3d9553360ec20c1c0bbb3abcb31e6fdc8a54ddde5019f5c708dc38d38ff98 |
|---|---|
| Source series | CUUR0000SA0 |
| Snapshot retrieved at | 2026-10-14T15:55:03.662Z |
| Methodology | 0.2.0-research |
| Dataset origin | Accepted publisher dataset |
| Latest recorded fixing | ipu-0.2.0-research-2026-10-27-r0 |
| Reconstructed reference date | 2026-10-28 |
| Last publication attempt | 2026-10-27T15:55:03.459Z |
| Source-calendar status | current |
| Calendar mode | versioned-schedule |
| Calendar last verified | 2026-09-13 |
| Calendar coverage through | 2026-12-31 |
| Expected CPI month | 2026-09 |
| Expected release time | 2026-10-14T12:30:00Z |
| External alert channel | Not configured |
The source check uses a versioned BLS release calendar. Coverage ends on 2026-12-31; the status requires review beyond that date. A successful data fetch alone does not establish that the expected monthly release has arrived.
BLS official CPI release calendar ↗Inspect latest published fixing
| Fixing ID | ipu-0.2.0-research-2026-10-27-r0 |
|---|---|
| Valuation date | 2026-10-27 |
| IPU Index | 128.58070 |
| Reference CPI | 334.80871 |
| Base date | 2021-01-01 (illustrative) |
| Base Reference CPI | 260.38800 |
| Published at | 2026-10-27T15:55:03.459Z |
| Source retrieved at | 2026-10-14T15:55:03.662Z |
| Source checked at | 2026-10-27T15:55:03.459Z |
| Methodology | 0.2.0-research |
| Implementation | 0.2.0 |
| Revision | 0 |
| Supersedes | None — original publication |
| Correction reason | Not applicable |
| Dataset SHA-256 | 66f3d9553360ec20c1c0bbb3abcb31e6fdc8a54ddde5019f5c708dc38d38ff98 |
| Source response SHA-256 | 97a8698d518dbe188062e426a76bb76668a1a0819481fb38dfbef4e502fecd3e |
| Record SHA-256 | a024f25d73773307b6c813c4d6a7e6b4a9b3dbf9881771f41f67ae725b2a53d7 |
Hashes identify canonical JSON content. They are not digital signatures and do not independently establish publication time or resistance to administrator tampering.
Inputs used by this record
| Month | CPI | Role | Origin |
|---|---|---|---|
| 2026-07 | 333.918 | valuation | BLS observation ↗Monthly release timestamp not retained in this source response |
| 2026-08 | 334.980 | valuation | BLS observation ↗Monthly release timestamp not retained in this source response |
| 2020-10 | 260.388 | base | BLS observation ↗Monthly release timestamp not retained in this source response |
02 / The calculation chain
Official monthly CPI → stated lag and calendar-day weight → rounded Reference CPI → normalization to the illustrative base → five-decimal IPU Index.
The October 2025 BLS observation remains missing in the original snapshot. Methodology 0.2 separately registers the Treasury-announced 325.604 contingency input. Its source and affected dates are disclosed; it is not presented as a BLS observation.
The baseline dataset is a retrieved source snapshot, not a historical archive of every BLS first release. Release timestamps are left unspecified where they were not retained. Retrieval times and actual IPU publication times are recorded separately.
03 / Originals and revisions
The publication ledger lists original daily records. Each original retains its identity when a job is retried. Revised values receive a new ID, a reason and a link to the earlier record.
Numeric changes to accepted historical CPI are quarantined for review. They cannot silently overwrite earlier fixings. Reconstructed history can be requested against an identified dataset, so it remains possible to reproduce an earlier calculation after the accepted source changes.
04 / Scope of this release
IPU Coin remains a proposed inflation-resistant stablecoin at the research stage. No token is issued, no reserves have been established for it, and no redemption mechanism is offered. There is no reserve attestation to display.
The code has not received an independent audit. Neither BLS nor the U.S. Treasury endorses IPU. The base date is illustrative, and published research records are not approved contractual settlement fixings.
Operational status reports the checks this application can observe. It does not establish independent monitoring, an availability guarantee or successful off-site disaster recovery.
05 / Primary sources
The links below identify the source series, Treasury calculation convention and the specific contingency announcement used in version 0.2.