README.md

Cardano Improvement Proposals (CIPs)

A Cardano Improvement Proposal (CIP) is a formalised design document for the Cardano community and the name of the process by which such documents are produced and listed. A CIP provides information or describes a change to the Cardano ecosystem, processes, or environment concisely and in sufficient technical detail. In this CIP, we explain what a CIP is; how the CIP process functions; the role of the CIP Editors; and how users should go about proposing, discussing and structuring a CIP.

The Cardano Foundation intends CIPs to be the primary mechanisms for proposing new features, collecting community input on an issue, and documenting design decisions that have gone into Cardano. Plus, because CIPs are text files in a versioned repository, their revision history is the historical record of significant changes affecting Cardano.

For more about the human factors of the CIP process, and to learn how to get involved, click the Wiki tab above (CIP Wiki).

Cardano Problem Statements (CPS)

A Cardano Problem Statement (CPS) is a formalised document for the Cardano ecosystem and the name of the process by which such documents are produced and listed. CPSs are meant to complement CIPs and live side-by-side in the CIP repository as first-class citizens.

Communication Channels

Extend or discuss ‘ideas’ in the Developer Forums, Cardano’s Official Developer Telegram Group or in #developers in Cardano Ambassadors Slack.

CIP editors facilitate discussions and progress submissions on GitHub, reviewing progress in bi-weekly meetings held on Discord which are open to the public. The Discord server also has channels for developer working groups to discuss details and implementations of selected CIPs.

Cardano Improvement Proposals (CIP)

#	Title	Status
0001	CIP Process	Active
0002	Coin Selection Algorithms for Cardano	Active
0003	Wallet key generation	Active
0004	Wallet Checksums	Proposed
0005	Common Bech32 Prefixes	Active
0006	Stake Pool Extended Metadata	Active
0007	Curve Pledge Benefit	Proposed
0008	Message Signing	Active
0009	Protocol Parameters (Shelley Era)	Active
0010	Transaction Metadata Label Registry	Active
0011	Staking key chain for HD wallets	Active
0012	On-chain stake pool operator to delegates communication	Proposed
0013	Cardano URI Scheme	Proposed
0014	User-Facing Asset Fingerprint	Active
0015	Catalyst Registration Transaction Metadata Format	Active
0016	Cryptographic Key Serialisation Formats	Active
0017	Cardano Delegation Portfolio	Inactive
0018	Multi-Stake-Keys Wallets	Proposed
0019	Cardano Addresses	Active
0020	Transaction message/comment metadata	Active
0021	Transaction requirements for interoperability with hardware wallets	Active
0022	Pool operator verification	Active
0023	Fair Min Fees	Proposed
0024	Non-Centralizing Rankings	Proposed
0025	Media Token Metadata Standard	Active
0026	Cardano Off-Chain Metadata	Active
0027	CNFT Community Royalties Standard	Active
0028	Protocol Parameters (Alonzo Era)	Active
0029	Phase-1 Monetary Scripts Serialization Formats	Active
0030	Cardano dApp-Wallet Web Bridge	Active
0031	Reference Inputs	Active
0032	Inline Datums	Active
0033	Reference Scripts	Active
0034	Chain ID Registry	Proposed
0035	Plutus Core Evolution	Active
0036	Catalyst Registration Transaction Metadata Format (Updated)	Proposed
0037	Dynamic Saturation Based on Pledge	Proposed
0040	Collateral Output	Active
0042	New Plutus Builtin serialiseData	Active
0045	Decentralized WebRTC dApp-Wallet Communication	Active
0049	ECDSA and Schnorr signatures in Plutus Core	Active
0050	Pledge Leverage-Based Staking Rewards	Proposed
0052	Cardano Audit Best Practice Guidelines	Proposed
0054	Cardano Smart NFTs	Proposed
0055	Protocol Parameters (Babbage Era)	Active
0057	Plutus Contract Blueprint	Active
0058	Plutus Bitwise Primitives	Inactive
0059	Terminology Surrounding Core Features	Active
0060	Music Token Metadata	Active
0067	Asset Name Label Registry	Proposed
0068	Datum Metadata Standard	Active
0069	Plutus Script Type Uniformization	Active
0071	Non-Fungible Token (NFT) Proxy Voting Standard	Proposed
0072	dApp Registration & Verification	Proposed
0074	Set minPoolCost to 0	Proposed
0075	Fair Stake Pool Rewards	Proposed
0080	Transaction Serialization Deprecation Cycle	Active
0082	Improved Rewards Scheme Parameters	Proposed
0083	Encrypted Transaction message/comment metadata (Addendum to CIP-0020)	Active
0084	Cardano Ledger Evolution	Active
0085	Sums-of-products in Plutus Core	Active
0086	NFT Metadata Update Oracles	Proposed
0088	Token Policy Registration	Proposed
0089	Distributed DApps & Beacon Tokens	Active
0091	Don't force Built-In functions	Proposed
0093	Authenticated Web3 HTTP requests	Proposed
0094	On-chain SPO polls	Active
0095	Web-Wallet Bridge - Conway ledger era	Active
0099	Proof of Onboarding	Active
0100	Governance Metadata	Active
0101	Integration of keccak256 into Plutus	Proposed
0102	Royalty Datum Metadata	Proposed
0103	Web-Wallet Bridge - Bulk transaction signing	Active
0104	Web-Wallet Bridge - Account public key	Proposed
0105	Conway Era Key Chains for HD Wallets	Active
0106	Web-Wallet Bridge - Multisig wallets	Proposed
0107	URI Scheme - Block and transaction objects	Proposed
0108	Governance Metadata - Governance Actions	Proposed
0109	Modular Exponentiation Built-in for Plutus Core	Proposed
0110	Plutus v1 Script References	Active
0112	Observe script type	Proposed
0114	CBOR Tags Registry	Proposed
0115	CBOR tag definition - ED25519-BIP32 Keys	Proposed
0116	Canonical JSON Encoding for Domain Types	Proposed
0117	Explicit script return values	Active
0118	Nested Transactions	Proposed
0119	Governance Metadata - DReps	Proposed
0120	Constitution specification	Proposed
0121	Integer-ByteString conversions	Active
0122	Logical operations over BuiltinByteString	Active
0123	Bitwise operations over BuiltinByteString	Active
0124	Extend token metadata for translations	Proposed
0127	Integration of ripemd_160 into Plutus	Active
0128	Preserving Order of Transaction Inputs	Proposed
0129	Governance Identifiers	Proposed
0132	New Plutus Builtin dropList	Proposed
0133	Plutus support for Multi-Scalar Multiplication over BLS12-381	Proposed
0134	Cardano URIs - Address Representation	Proposed
0135	Disaster Recovery Plan for Cardano networks	Active
0136	Governance metadata - Constitutional Committee votes	Proposed
0137	Decentralized Message Queue	Proposed
0138	Plutus Core Builtin Type - Array	Proposed
0139	Universal Query Layer	Proposed
0140	Ouroboros Peras - Faster Settlement	Proposed
0141	Web-Wallet Bridge - Plutus wallets	Proposed
0142	Web-Wallet Bridge - Network Determination	Proposed
0143	Interoperable Programmable Tokens	Inactive
0146	Multi-signature wallet registration and discovery	Proposed
0149	Optional DRep Compensation	Proposed
0150	Block Data Compression	Proposed
0151	On-Chain Registration - Stake Pools	Proposed
0152	Modules in UPLC	Proposed
0153	Plutus Core Builtin Type - MaryEraValue	Proposed
0155	SRV Registry	Proposed
0156	Plutus Core Builtin Function - multiIndexArray	Proposed
0158	Cardano URIs - Browse Application	Proposed
0159	Account Address Enhancement	Proposed
0160	Receiving Script Purpose and Addresses	Proposed
0161	Ouroboros Phalanx - Breaking Grinding Incentives	Proposed
0162	URI Scheme - DRep Links	Proposed
0163	Time-Bound Delegation with Dynamic Rewards	Proposed
0164	Ouroboros Linear Leios - Greater transaction throughput	Proposed
0165	Canonical Ledger State	Proposed
0167	Remove isValid from transactions	Proposed
0170	KERI-backed metadata attestations	Proposed
0171	On-chain Smart Contract Bytecode Verification	Proposed
0173	Net Change Limit Parameter	Proposed
0176	Non-segregated Block Body Serialization	Proposed
0177	Ouroboros Tachys - Faster Cardano partner chains	Proposed
0179	On-Chain Surveys and Polls	Proposed
0181	Remove DRep Requirement for Reward Withdrawals	Proposed
0187	Utilization-Scaled Pledge Bonus	Proposed
0381	Plutus Support for Pairings Over BLS12-381	Active
1694	A First Step Towards On-Chain Decentralized Governance	Active
1852	HD (Hierarchy for Deterministic) Wallets for Cardano	Active
1853	HD (Hierarchy for Deterministic) Stake Pool Cold Keys for Cardano	Proposed
1854	Multi-signatures HD Wallets	Active
1855	Forging policy keys for HD Wallets	Proposed
9999	Cardano Problem Statements	Active

Last updated on 2026-06-23

Proposals Under Review (CIP)

The following link lists "candidate" CIPs still under discussion with the community; these are assigned numbers to avoid later clashes and to facilitate community discussion (see further below for stalled proposals):

CIP pull requests under active review (most recently discussed first)

Cardano Problem Statements (CPS)

#	Title	Status
0003	Smart tokens	Open
0005	Plutus Script Usability	Open
0007	Voltaire era Governance	Open
0008	Domain Name Resolution	Open
0009	Coin Selection Including Native Tokens	Open
0010	Wallet Connectors	Open
0011	Universal JSON Encoding for Domain Types	Open
0012	Query Layer Standardization	Open
0013	Better builtin data structures in Plutus	Open
0014	Register of On-Chain CBOR Tags	Open
0016	Cardano URIs	Open
0017	Settlement Speed	Open
0018	Greater Transaction Throughput	Open
0020	Governance Stakeholder Incentivization	Open
0021	Ouroboros Randomness Manipulation	Open
0022	Lost Stake	Open
0026	Approaches to Fully Homomorphic Encryption	Open
0027	Approaches to Post-Quantum Signatures	Open
0029	Approaches to Higher-Order Costing	Open

Last updated on 2026-05-12

Proposals Under Review (CPS)

The following link lists "candidate" CPSs still under discussion with the community; these are assigned numbers to avoid later clashes and to facilitate community discussion (see further below for stalled proposals):

CPS pull requests under active review (most recently discussed first)

Updates Under Consideration

The following link shows updates to existing CIPs and CPSs that have entered the review process:

CIP and CPS updates under consideration (most recently discussed first)

Stalled / Waiting For Authors

The following links list proposals deemed ready for review but requiring further update from the original author(s) or other confirmation of proposal elgibility (if considered deprecated):

Stalled CIPs and CPSs (all lists least recently discussed first) - consisting of:

• proposals Waiting for Author
• proposals Likely Abandoned
• proposals Likely Deprecated

Proposals stalled without any updates from their authors will eventually be closed. However, authors are invited to re-open pull requests or open new ones should they want to bring the discussion back to life.

Editors

Robert Phair @rphair	Ryan Williams @Ryun1	Thomas Vellekoop @perturbing