Standards reference
Reference of standards, specifications, and frameworks cited in the OTL protocol specification and flow explorer, with URLs and licensing terms for informational purposes. Implementors are responsible for independently assessing and complying with the terms applicable to any third-party standard they implement.
1. Financial Messaging & Payment
| Standard | Full Name | Body | URL | License / Access |
|---|---|---|---|---|
| ISO 20022 | Universal financial industry message scheme | ISO TC68 | iso20022.org | Paywalled (ISO); schema/message definitions freely downloadable via iso20022.org |
| ISO 18245 | Merchant Category Codes (MCC) | ISO | iso.org | Paywalled (ISO); MCC tables widely available openly |
| ISO 4217 | Currency Codes | ISO | iso.org | Paywalled; codes themselves freely usable — SIX Group publishes free tables |
2. Regulatory & Compliance
| Standard | Full Name | Body | URL | License / Access |
|---|---|---|---|---|
| FATF Travel Rule | Recommendation 16 — Virtual Assets | FATF | fatf-gafi.org | Free; public guidance |
| IVMS101 | Inter-VASP Messaging Standard 101 | GBBC Digital Finance / OpenVASP / VASPnet | intervasp.org | Free; open standard; data model standard text is CC BY-ND 4.0 |
| ISO 17442 | Legal Entity Identifier (LEI) | ISO / GLEIF | iso.org | Paywalled (ISO spec); LEI data is CC0 via GLEIF |
| GLEIF API | Global LEI Foundation — LEI data & registry | GLEIF | gleif.org | CC0 (Public Domain) — freely available, 60 req/min |
3. Digital Identity — DIDs & Credentials
| Standard | Full Name | Body | URL | License / Access |
|---|---|---|---|---|
| W3C DID Core 1.0 | Decentralized Identifiers | W3C | w3.org | W3C Software and Document License |
| did:webvh | Web Verifiable Hosting DID Method | DIF / W3C CCG | identity.foundation | W3C Patent Policy (2004) |
| W3C VC Data Model v2.0 | Verifiable Credentials Data Model | W3C | w3.org | W3C Software and Document License |
| W3C Data Integrity / eddsa-jcs-2022 | EdDSA Data Integrity Cryptosuite | W3C | w3.org | W3C Software and Document License |
| Ed25519 / X25519 Key Suites | Ed25519VerificationKey2020 / X25519KeyAgreementKey2020 | W3C CCG | w3id.org | W3C Community Group Report License |
| RFC 9901 | SD-JWT — Selective Disclosure for JWTs | IETF | datatracker.ietf.org | IETF Trust License |
| draft-ietf-oauth-sd-jwt-vc | SD-JWT Verifiable Credentials Profile | IETF | datatracker.ietf.org | IETF Trust License |
| OID4VCI | OpenID for Verifiable Credential Issuance | OpenID Foundation | openid.net | OpenID Foundation IPR Policy |
| Multibase | Multibase encoding (base58btc / z-prefix) | W3C CCG | w3c-ccg.github.io | W3C CLA (spec) / Apache 2.0 (implementations) |
4. Cryptographic Suites & Encodings
| Standard | Full Name | Body | URL | License / Access |
|---|---|---|---|---|
| RFC 7515 | JSON Web Signature (JWS) | IETF | datatracker.ietf.org | IETF Trust License |
| RFC 7516 | JSON Web Encryption (JWE) | IETF | datatracker.ietf.org | IETF Trust License |
| RFC 7517 | JSON Web Key (JWK) | IETF | datatracker.ietf.org | IETF Trust License |
| RFC 7519 | JSON Web Token (JWT) | IETF | datatracker.ietf.org | IETF Trust License |
| RFC 8785 | JSON Canonicalization Scheme (JCS) | IETF | datatracker.ietf.org | IETF Trust License |
5. Messaging & Transport
| Standard | Full Name | Body | URL | License / Access |
|---|---|---|---|---|
| DIDComm Messaging v2 | DIDComm v2 | DIF | identity.foundation | W3C Software and Document License |
| RFC 6749 | OAuth 2.0 Authorization Framework | IETF | datatracker.ietf.org | IETF Trust License |
| RFC 7595 | Guidelines for URI Scheme Registration | IETF | datatracker.ietf.org | IETF Trust License |
| JSON-LD 1.1 | JSON-LD (Linked Data) | W3C | w3.org | W3C Software and Document License |
6. Asset Identification
| Standard | Full Name | Body | URL | License / Access |
|---|---|---|---|---|
| ISO 24165 / DTI | Digital Token Identifiers | ISO / DTIF | dtif.org | ISO spec paywalled; DTI codes and reference data freely available via dtif.org |
| CAIP-2 | Blockchain ID Specification | CASA | chainagnostic.org | CC0 (Public Domain) |
| CAIP-19 | Asset Type and Asset ID Specification | CASA | chainagnostic.org | CC0 (Public Domain) |
| CAIP-358 | Universal Payment Request Method (wallet_pay) | CASA | chainagnostic.org | CC0 (Public Domain) — Draft |
7. Blockchain / EVM Standards
| Standard | Full Name | Body | URL | License / Access |
|---|---|---|---|---|
| EIP-1193 | Ethereum Provider JavaScript API | Ethereum Foundation | eips.ethereum.org | CC0 (Public Domain) |
| EIP-191 | Signed Data Standard (personal_sign) | Ethereum Foundation | eips.ethereum.org | CC0 (Public Domain) |
| ERC-20 / EIP-20 | Ethereum Token Standard | Ethereum Foundation | eips.ethereum.org | CC0 (Public Domain) |
| SPL-Token | Solana Program Library Token Standard | Solana Labs | spl.solana.com | Apache 2.0 |