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52 commits this week Feb 28, 2026 - Mar 07, 2026
CIP-???? | Block Producer Identification
Update to make some minor grammar changes and add ABNF grammar definition and rules from RFC 9110 which defines user-agent strings in the web context

Update to include a best-guess estimate of ledger growth based on implementing this with some references. Also updated references and added relevant footnote markers in the text.

Minor update to highlight all RFC 2119 keywords in the text

Co-authored-by: Adam Dean <[email protected]>
CIP-0165? | Canonical Ledger State (#1083)
* Proposal of canonical ledger state format

This proposal defines the Simple Canonical Ledger State (SCLS),
a stable, versioned, and verifiable file format for representing
the Cardano ledger state. It specifies a segmented binary container
with deterministic CBOR encodings, per-chunk commitments, and
a manifest that enables identical snapshots across implementations,
supports external tools (e.g., Mithril), and future-proofs distribution
and verification of state.

> Co-Authored-By: Nicholas Clarke <[email protected]>
> Co-Authored-By: João Santos Reis <[email protected]>

* Update CIP-015x/README.md: fix Discussion topic

Co-authored-by: Ryan <[email protected]>

* Update CIP-015x/README.md: fix link style

Co-authored-by: Ryan <[email protected]>

* Update CIP-015x/README.md

Co-authored-by: Robert Phair <[email protected]>

* CLS: Improve README formatting and link references

update references format

* CLS: Add CBOR vs JSON section

* CLS: Fix more links

* CLS: Fix more links

* CLS: Fix even more links

* CIP: CLS fix terminology block -> record

* Update CIP-015x/README.md

Co-authored-by: Nicholas Clarke <[email protected]>

* Update CIP-015x/README.md

Co-authored-by: Nicholas Clarke <[email protected]>

* Update definition and typography

* Do not try to be clever with links

* Fix more links

* Fix another broken link

* CIP: CLS — upadte META Record structure

Use cbor data in metadata value.
It will allow other software store structured introspectable metadata
in file.

* Update file structure.

Rewrite file structure definition and format.cddl

* Update CIP-015x/README.md

Co-authored-by: Ryan <[email protected]>

* CIP: Canonical Ledger state add example for utxo namespace

Added generated example of the specification

* Update CIP-015x/README.md

Co-authored-by: Ryan <[email protected]>

* Update CIP-015x/README.md

Co-authored-by: Adam Dean <[email protected]>

* Update CIP-015x/README.md

Co-authored-by: Adam Dean <[email protected]>

* Update CIP-015x/README.md

Co-authored-by: Robert Phair <[email protected]>

* Canonical Ledger State, set CIP number

* Update CIP-0165/format.cddl

Co-authored-by: Alexey Kuleshevich <[email protected]>

* Update CIP-0165/namespaces/README.md

Co-authored-by: Alexey Kuleshevich <[email protected]>

* Move to more explicit terms, slot_no instead of transaction

* CIP-0165: be more explicit about data validation

* Add an explicit declaratio that this CIP does not define how ledger stores state

* Add information about the manifest record

Add offset so it would be possible to reconcstruct manifest by reading the file
from the end.

Add number of entries and chunks per-namespace

Add a comment about the spec

* Clarify tombstone and value deletion (#2)

* Clarify tombstone and value deletion

During an implementation it because obvous that it's easier to keep tombstones
an explicit value in delta blocks. In this MR we remove obsolete tombstone/v0
namespaces and update spec

* Explicitly require keys for entries

* Add clarification about tombstone entries

* CIP-0165: specification of the binary file (#5)

* CIP-0165: specification of the binary file

Provide a binary file specification in Kaitai Struct format
as well as html description of the format and svg diagram


Co-authored-by: João Santos Reis <[email protected]>

* Fix format

* Update keys (#6)

* Explicitly describe the length of the record payload

* Drop len_data field, we already know it because we can calculat that from datastructure size

* Introduce structure for the entries and a fixed size keys

This commit introduces a fixed size keys the size of the key depends on the
namespace that is used.

This approach allows us not to waste time on the encoding of the size
for each key and allows to have nice and fast keys for each namespace
used.

* remove tombstone namespace from the list of the namespaces

* Update CIP to explicitly tell how we deal with trees

* Update CIP-0165/README.md

Co-authored-by: João Santos Reis <[email protected]>

* Update CIP-0165/README.md

Co-authored-by: João Santos Reis <[email protected]>

* Fixes in spec

---------

Co-authored-by: João Santos Reis <[email protected]>

* Add metadata record to spec

* Update doc

* Use sizeof<metadata_footer> instead of hardcoded values

* Update .ksy with key length

* Add namespaces definitions (#10)

* Add namespaces

* Update namespaces definitions

* Updates

* Update CIP-0165/README.md

Co-authored-by: Nicholas Clarke <[email protected]>

* Address review comments

---------

Co-authored-by: Nicholas Clarke <[email protected]>

* Update format ksy

sizeof is not supported by ksy

* Apply suggestions from code review

Co-authored-by: Thomas Vellekoop <[email protected]>

* Apply suggestions from code review

Co-authored-by: Thomas Vellekoop <[email protected]>

* Update CDDL specifications

* Fix typo in README.md: change "deletage" to "delegate"

* Fix typo in format.ksy: change "ISO8061" to "ISO8601"

* Update terminology from "block" to "record" in format.ksy

* Update DELTA block information

* Remove null terminator from magic string in README.md

* Fix typos and improve clarity in README.md

* Update heading from "Directory Record" to "DIR Record" for consistency

* Rename 'namespaces_bytes' to 'name' for clarity in format.ksy

* Clarify design approach for streaming

* Clarify mithril scenario

* Fix typo

* Add note about chunk format and compression

* Update and clarify namespace information in README.md

* Fix headings for consistency in README.md

* Clarify description of 'chunk_format' in README.md to specify it indicates the compression scheme

* Place namespaces section on namespaces earlier in the document

* Update headings for consistency in README.md

* Clarify doc for 'offset' in manifest record

* Clarify data types for `root_hash` and `digest`

* Clarify entry digest computation and verification section

* Fix typo in DataEntry description

* Move slot_no to the manifest (#11)

* Move slot_no to the manifest

* Removed slot_no from the delta record

* Add explicit key size definition for namespace in format.ksy

* Revert human readable names to tags

* Update representation utxo

* Remove pots/v0 namespace as it's can be derived from the other parts of the state

* Change footer entries_count type from u64 to u32

Updated footer entry count type from u64 to u32 for consistency.

* Remove network_id enum from format.ksy

Removed network_id enum definitions from format.ksy.

* Clarify namespace ordering and Merkle tree ambiguities

- CHUNK records are ordered by namespace, bytewise/UTF-8
- Merkle nodes use the `0x00` domain separator
- Merkle trees are unbalanced, with a "promote depth" behaviour on
  trailing nodes
- Global Merkle root is computed from the per-namespace Merkle roots
- Empty Merkle tree is H("")

---------

Co-authored-by: Ryan <[email protected]>
Co-authored-by: Robert Phair <[email protected]>
Co-authored-by: Nicholas Clarke <[email protected]>
Co-authored-by: Adam Dean <[email protected]>
Co-authored-by: Alexey Kuleshevich <[email protected]>
Co-authored-by: João Santos Reis <[email protected]>
Co-authored-by: João Santos Reis <[email protected]>
Co-authored-by: Thomas Vellekoop <[email protected]>
Co-authored-by: Christopher Harrison <[email protected]>
CIP-0158? | Cardano URIs - Browse Authority (#1058)
* First draft CIP for creating a `browse` URI scheme to extend web+cardano and deep-link capabilities for application support.

* Update title

Co-authored-by: Robert Phair <[email protected]>

* Update CIP Number

Co-authored-by: Robert Phair <[email protected]>

* Update pull request number in discussion header

Co-authored-by: Ryan <[email protected]>

* Updates based on initial feedback
- Introduce versioning to URI scheme
- Clean up some grammatical errors
- Add explanation of security benefits and considerations section to the motivation
- Update some parts of implementation plan that have been completed.

* fix typo to clear review field

* Update CIP-XXXX/README.md

Update per Robert's editorial suggestion

Co-authored-by: Robert Phair <[email protected]>

* update URI format

Co-authored-by: Alexandru Dochioiu <[email protected]>

* update syntax parameters, including complete target URI encoding

Co-authored-by: Alexandru Dochioiu <[email protected]>

* add Alex Dochioiu @ VESPR as co-author

Co-authored-by: Alexandru Dochioiu <[email protected]>

* update example web app

Co-authored-by: Alexandru Dochioiu <[email protected]>

* update example IPFS app

Co-authored-by: Alexandru Dochioiu <[email protected]>

* update example locally developed app

Co-authored-by: Alexandru Dochioiu <[email protected]>

* removed ABNF grammar (now become unpredictable)

Co-authored-by: Alexandru Dochioiu <[email protected]>

* update allow/block list behaviour

Co-authored-by: Alexandru Dochioiu <[email protected]>

* removed rationale for domain namespacing (which has been removed)

Co-authored-by: Alexandru Dochioiu <[email protected]>

* removed rationale for scheme in path (which has been removed)

Co-authored-by: Alexandru Dochioiu <[email protected]>

* removed acceptance criterion of dApps needing to publish browse URIs

Co-authored-by: Alexandru Dochioiu <[email protected]>

* removed requirement for social testing from Implementation Plan

Co-authored-by: Alexandru Dochioiu <[email protected]>

* Bit of cleanup and moving to the correct folder

---------

Co-authored-by: Robert Phair <[email protected]>
Co-authored-by: Ryan <[email protected]>
Co-authored-by: Alexandru Dochioiu <[email protected]>