Cardano Improvement Proposals

Cardano Improvement Proposals (CIPs)

Cardano Improvement Proposals (CIPs) describe standards, processes; or provide general guidelines or information to the Cardano Community. It is a formal, technical communication process that exists off-chain. CIPs do not represent a commitment of any form towards existing projects. Rather, they are a collection of sensible and sound solutions to common problems within the Cardano ecosystem. CIPs evolves around different statuses, driven by one or more authors:

Status Description
Draft The idea has been formally accepted in the repository and is being worked on by its authors.
Proposed A working implementation exists, as well as a clear plan highlighting what is required for this CIP to transition to "Active".
Active The proposal is deemed to have met all the appropriate criteria to be considered Active.
On Hold The CIP author is not currently working on this effort.
Obsolete The CIP was either retired or made obsolete by a newer CIP.
Rejected There is some issue with the CIP that makes it not acceptable at this point.

It is therefore quite common for proposals and implementations to be worked on concomitantly. Even more so that a working implementation (when relevant) is a mandatory condition for reaching an Active status.

The entire process is described in greater detail in CIP1 - "CIP Process".

Reviewed Proposals

# Title Status
1 CIP process Active
2 Coin Selection Algorithms for Cardano Active
3 Wallet key generation Active
4 Wallet Checksums Draft
5 Common Bech32 Prefixes Active
6 Stake Pool Extended Metadata Draft
7 Curve Pledge Benefit Proposed
8 Message Signing Draft
9 Protocol Parameters Active
10 Transaction Metadata Label Registry Active
11 Staking key chain for HD wallets Active
12 On-chain stake pool operator to delegates communication Draft
13 Cardano URI Scheme Draft
14 User-Facing Asset Fingerprint Active
15 Catalyst Registration Transaction Metadata Format Active
16 Cryptographic Key Serialisation Formats Active
17 Cardano Delegation Portfolio Active
18 Multi-Stake-Keys Wallets Draft
19 Cardano Addresses Active
20 Transaction message/comment metadata Active
21 Transaction requirements for interoperability with hardware wallets Draft
22 Pool operator verification Active
23 Fair Min Fees Draft
24 Non-Centralizing Rankings Draft
25 Media NFT Metadata Standard Active
26 Cardano Off-Chain Metadata Draft
27 CNFT Community Royalties Standard Draft
28 Protocol Parameters (Alonzo) Active
29 Phase-1 Monetary Scripts Serialization Formats Active
30 Cardano dApp-Wallet Web Bridge Draft
31 Reference Inputs Active
32 Inline Datums Active
33 Reference Scripts Active
34 Chain ID Registry Draft
35 Plutus Core Evolution Active
36 Catalyst/Voltaire Registration Transaction Metadata Format Proposed
37 Dynamic Saturation Based on Pledge Proposed
40 Collateral Output Active
42 New Plutus Builtin: serialiseBuiltinData Active
52 Cardano Audit Best Practice Guidelines Proposed
54 Cardano Smart NFTs Draft
55 Babbage Era's coinsPerUTxOByte Proposed
59 Terminology Surrounding Core Features Active
60 Music Token Metadata Proposed
68 Datum Metadata Standard Proposed
381 Plutus Support for Pairings Over BLS12-381 Proposed
1852 HD (Hierarchy for Deterministic) Wallets for Cardano Active
1853 HD (Hierarchy for Deterministic) Stake Pool Cold Keys for Cardano Active
1854 Multi-signatures HD Wallets Draft
1855 Forging policy keys for HD Wallets Active

Last updated on 2022-10-11

💡 For more details about Statuses, refer to CIP1.

Proposals Under Review

Below are listed tentative CIPs still under discussion with the community. Discussions and progress will be reviewed by CIP editors in bi-weekly meetings held on Discord (invite), then transcribed and summarized here. Note that they are listed below for easing navigation and also tentatively allocating numbers to avoid clashes later on.

# Title
38? Arbitrary Script as Native Script Spending Conditions
39? Language Annotated Address
41? UPLC Serialization Optimizations
43? Address Resolution Through DNS
44? Additional Factors For NFT Market Verification
45? Decentralization: Using Pledge as a Bidding Param
46? Prepay Min Fixed Fee
47? Hardfork Safety Mechanism
48? Extended NFT metadata
49? ECDSA and Schnorr signatures in Plutus Core
50? Shelley's Voltaire Decentralization Update
51? Preserve Submitter's Ordering of Transaction Inputs
53? Multi-Script Hashes
56? Treasury Donation
57? On-Chain Script Blueprint
58? Plutus Bitwise Primitives
62? Governance API for dApp Connectors
63? Transferring Stake Pool Ownership
66? NFT Identity / W3C DID on Cardano
67? Asset Name Label Registry
69? Plutus Script Type Uniformization
70? Rejected Ideas w.r.t Spending Policies
2551? Ed25519 Elliptic Curve Group Primitives in Plutus Core

Last updated on 2022-10-11

Stalled / Waiting For Authors

The following list contains proposals that have been under review and for which actions are now awaiting updates of their original authors. Proposals that have been stalled for several months without any updates from their authors will be eventually closed. Authors are invited to re-open pull requests or open new ones should they want to bring back the discussion to life.

Last updated on 2022-10-11

CIP creation process as a Sequence Diagram

  “Alice has a Cardano idea she'd like to build more formally…

Diagram: Mary interacting with community and editors for a Cardano Proposal

Extend or discuss ‘ideas’ in the Developer Forums, Cardano’s Official Developer Telegram Group or in #developers in Cardano Ambassadors Slack. CIP Editors meetings are public and recorded: do join and participate for discussions/PRs of significance to you.

To facilitate browsing and information sharing for non-Github users, an auto-generated site is also provided at

Current Editors

Frederic Johnson
Matthias Benkort
Sebastien Guillemot
Robert Phair