> For the complete documentation index, see [llms.txt](https://docs.cdpi.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cdpi.dev/references/home.md).

# Curated Specifications

Reference Links

## 1. Overview

Centre for Digital Public Infrastructure (CDPI) curates open standards and specifications across various categories of DPIs for easy reference. This is an initiative to curate specifications that follow [DPI principles](/the-dpi-wiki/dpi-tech-architecture-principles.md) to enable countries to create required Digital Public Infrastructure rails. This list includes open specifications that are published by non-profit global institutions or agreed upon based on a global governance, as well as de-facto standards used by countries where the specifications have reached a scale of over 10 million transactions.

**Note:**

1. This is a living list. All stakeholders in the DPI space are welcome to share comments.
2. Reference implementations listed here are provided as per the claim of implementing organisations. CDPI has not verified these claims.
3. Countries are advised to independently verify at the time of the adoption.

## 2. Identifier & Registries

### 2.1 Auth & eKYC

1. OAuth - [specs](https://www.rfc-editor.org/rfc/rfc6749)
2. Open ID - [specs](https://openid.net/developers/)
3. SAML - [specs](http://docs.oasis-open.org/security/saml/Post2.0/sstc-saml-tech-overview-2.0.html)

## 3. Signatures & Consent

### 3.1 eSign

1. PKCS #10 - [standard](https://datatracker.ietf.org/doc/html/rfc2986)
2. X.509 certificate and CRL profile (IETF RFC 5280) - [standard](https://datatracker.ietf.org/doc/html/rfc5280)
3. ETSI advanced electronic signature formats: CAdES (EN 319 122), PAdES (EN 319 142) and XAdES (EN 319 132) - [standards](https://www.etsi.org/technologies/digital-signature)
4. ETSI TS 119 612 trusted lists (used for EU eIDAS trust services) - [standard](https://www.etsi.org/deliver/etsi_ts/119600_119699/119612/)

### 3.2 Digital Data Sharing Consents

1. Electronic Consent artefact (Ministry of IT, India) - [spec](https://dla.gov.in/sites/default/files/pdf/MeitY-Consent-Tech-Framework%20v1.1.pdf)
2. Consent building block (Govstack) - [docs](https://govstack.gitbook.io/bb-consent/) | [specs](https://github.com/GovStackWorkingGroup/bb-consent)

## 4. Payments

### 4.1 G2P, P2P & P2M Payments

1. G2P Connect - [docs](https://g2pconnect.cdpi.dev/g2p-connect/readme) | [specs](https://g2p-connect.github.io/specs/)
2. P2P / P2M - Unified Payments Interface (UPI), NPCI - [docs](https://www.npci.org.in/what-we-do/upi/product-overview)
3. UK Open Banking Payments - [specs](https://standards.openbanking.org.uk/api-specifications/)
4. ISO 20022 messaging standards [docs](https://www.iso20022.org/iso-20022-message-definitions?business-domain=1) | specs

#### 4.1.1 Reference Implementations

1. Batch payments -  [Mojaloop](https://docs.mojaloop.io/getting-started/), [Mifos](https://mifos.org/resources/documentation/)
2. Beneficiary / Scheme Mgmt partners - [OpenG2P](https://docs.openg2p.org/guides/developer-guides), [OpenSPP](https://docs.openspp.org/index.html), [DIGIT](https://core.digit.org/)
3. Cash In Cash Out (CICO) - AePS [specs](https://www.npci.org.in/PDF/AePS/MicroATM_Standards_v1.5.1_Clean.pdf?TSPD_101_R0=08f002952bab20008b7d8da5fd1e2eab2b05707bcf97d4d8a37e2e70559f1e5cf52cf371b2dd168808262911fb14300061acdcd788119a546d34e72dd804f44c2e3b50502dbe0deab71add6e66931a3c1c3f7d06c44de06e493ae71639d420a0) published by NPCI/IBA/UIDAI

## 5. Data & Open AI/ML Models

### 5.1 Verifiable Credentials Issuance

1. W3C Verifiable Credentials Data Model 2.0 [standard](https://www.w3.org/TR/vc-data-model-2.0/) | implementation [guide](https://www.w3.org/TR/vc-imp-guide/) | draft issuance api [specs](https://w3c-ccg.github.io/vc-api/)
2. ISO/IEC 18013-5 mobile driving licence (mDL/mdoc) - [standard](https://www.iso.org/standard/69084.html)
3. G2P Connect issuance [docs](https://g2pconnect.cdpi.dev/protocol/interfaces/credentialing) | specs
4. IETF SD-JWT VC - [specs](https://datatracker.ietf.org/doc/draft-ietf-oauth-sd-jwt-vc/)
5. OpenID for Verifiable Credential Issuance (OID4VCI) 1.0 - [specs](https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0.html)
6. OpenID for Verifiable Presentations (OID4VP) 1.0 - [specs](https://openid.net/specs/openid-4-verifiable-presentations-1_0.html)
7. W3C Decentralized Identifiers (DID) Core - [standard](https://www.w3.org/TR/did-core/)
8. ISO/IEC 18013-7 mDL online presentation - [standard](https://www.iso.org/search.html?q=18013-7)

#### **5.1.1 Reference Specs/Implementations:**

1. Sunbird VC issuance [docs](https://docs.sunbirdrc.dev/learn/readme) | [specs](https://github.com/Sunbird-RC/sunbird-rc-core/tree/main/api-documentation)
2. Inji by MOSIP [docs](https://docs.inji.io) | specs
3. CREDEBL (Self-Sovereign Identity (SSI) & Verifiable Credentials (VCs))  [docs](https://docs.credebl.id/docs) | [specs](https://github.com/credebl)

### 5.2 Verifiable Credentials - Presentation

1. W3C compliant presentation standard | Implementation [guide](https://www.w3.org/TR/vc-imp-guide/)

#### 5.2.1 Reference Specs/Implementations:

1. Credential Schemas: Sunbird VC [specs](https://github.com/VC-Specs/vc-specs) | [schemas](https://docs.google.com/spreadsheets/d/1y4z1X7Dfercj7C3wkKbPAR_ExHbL_KgXbwtFzeFK078/edit#gid=1454655977) (draft)
2. EU digital identity wallet [docs](https://github.com/eu-digital-identity-wallet/eudi-doc-architecture-and-reference-framework/blob/main/docs/arf.md) | [specs](https://github.com/eu-digital-identity-wallet/eudi-doc-architecture-and-reference-framework)

### 5.3 Consented Data Sharing

1. X-Road [docs](https://docs.x-road.global/)| [specs](https://github.com/nordic-institute/X-Road)
2. Account Aggregator (Financial data sharing) [specs](https://github.com/Sahamati/account-aggregator-standards)

### 5.4 Datasets

1. ML data sets to train for local languages [docs](https://bhashini.gov.in/ulca/model/benchmark-datasets) | specs

## 6. Discovery & Fulfilment

### 6.1 eCommerce Network

1. Beckn Protocol - [docs](https://becknprotocol.io/) | [specs](https://github.com/beckn/protocol-specifications)

### 6.2 Education

1. Sunbird - [docs](https://sunbird.org/product/building-blocks) | specs
2. BeckN DSEP - docs | [specs](https://github.com/beckn/DSEP-Specification)

### 6.3 Healthcare

1. BeckN Decentralised Health Protocol - DHP [docs](https://developers.becknprotocol.io/docs/introduction/introduction/) | [specs](https://github.com/dhp-project/DHP-Specs)
2. Health Claims Exchange - HCX [docs](https://docs.hcxprotocol.io) | [specs](https://github.com/hcx-project/hcx-specs)
3. Data exchange
   * Consent-based data exchange: DEPA [docs](https://depa.world) | [specs](https://github.com/iSPIRT/DEPA/blob/main/depa_2.0.yaml)
   * X-Road [docs](https://docs.x-road.global/)| [specs](https://github.com/nordic-institute/X-Road)
4. Data schema/ standards- [docs](http://www.hl7.org/fhir/documentation.html)
5. Information management systems (individual, hospital, community levels)
   * OpenMRS - [docs](https://wiki.openmrs.org/) | [specs](https://github.com/OpenMRS)
   * DHIS2 -[ docs](https://dhis2.org/about/) 
   * OpenEHR - [docs](https://specifications.openehr.org/releases/BASE/latest/architecture_overview.html#_architecture_overview) | [specs](https://openehr.atlassian.net/jira/projects)
   * OpenELIS - [docs](http://docs.openelis-global.org/en/latest/) | [specs](https://github.com/I-TECH-UW/OpenELIS-Global-2/)
6. Vaccination certificate (Verifiable credential): DIVOC [docs](https://divoc.digit.org/) | [specs](https://github.com/egovernments/DIVOC)

### 6.4 Social Networks

1. Open social network (Decentralized Social Networking Protocol) [docs](https://dsnp.org/introducing-dsnp.html) | [specs](https://spec.dsnp.org/)