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| 1 | +--- |
| 2 | +CIP: 134 |
| 3 | +Title: Cardano URIs - Address Representation |
| 4 | +Category: Wallets |
| 5 | +Status: Proposed |
| 6 | +Authors: |
| 7 | + - Steven Johnson <steven.johnson@iohk.io> |
| 8 | +Implementors: [] |
| 9 | +Discussions: |
| 10 | + - https://github.com/cardano-foundation/CIPs/pull/888 |
| 11 | +Created: 2024-08-23 |
| 12 | +License: CC-BY-4.0 |
| 13 | +--- |
| 14 | + |
| 15 | +## Abstract |
| 16 | + |
| 17 | +This CIP proposes an extension to [CIP-0013] to allow easy and unambiguous encoding of |
| 18 | +[CIP-0019]/[CIP-0105] Addresses into URL's. |
| 19 | + |
| 20 | +## Motivation: why is this CIP necessary? |
| 21 | + |
| 22 | +[CIP-0013] defines encoding for payment addresses and stake pool, however [CIP-0019] |
| 23 | +and [CIP-0105] define numerous other address types. |
| 24 | + |
| 25 | +These addresses cannot currently be encoded into URIs unambiguously. |
| 26 | +This extension proposes a simple and forward compatible method of encoding such addresses into the URI scheme defined by [CIP-0013]. |
| 27 | + |
| 28 | +[x509] certificates can contain name or alternative name information related to either the issuer of |
| 29 | +the certificate or its subject. |
| 30 | +It is desirable to distinguish an Issuer or Subject of a certificate by one or more on-chain keys. |
| 31 | +This, for example, can facilitate the ability to link off-chain actions authorized with a x509 certificate, |
| 32 | +with an on-chain identity. |
| 33 | + |
| 34 | +Currently, there is no standard way to embed a Cardano address, such as a stake address, |
| 35 | +or a dRep address as distinguishing name within a [x509] certificate. |
| 36 | + |
| 37 | +A URI is one of the possible names that can be associated with the Issuer or Subject of a certificate. |
| 38 | +This URI can be referenced in the alternative name for both the Issuer and Subject of a certificate |
| 39 | +by using the uniformResourceIdentifier in the general name. |
| 40 | +[CIP-0013] does not define a method for stake or dRep addresses, etc., to be encoded in the URI scheme it defines. |
| 41 | + |
| 42 | +Allowing these addresses to be easily encoded as URIs allows them to be 100% interoperable |
| 43 | +with existing public key infrastructure and certificate creation tools. |
| 44 | + |
| 45 | +## Specification |
| 46 | + |
| 47 | +We extend [CIP-0013] with a single new authority for referencing Cardano addresses in [CIP-0019] format. |
| 48 | + |
| 49 | +### Grammar & interpretation |
| 50 | + |
| 51 | +We extend the grammar from [CIP-0013] with the new authority: |
| 52 | + |
| 53 | +``` |
| 54 | +authorityref = (... | addr ) |
| 55 | +
|
| 56 | +addr = "//addr/" cip19-addr |
| 57 | +cip19-addr = *cip19-char |
| 58 | +cip19-char = ALPHA / DIGIT / "_" |
| 59 | +``` |
| 60 | + |
| 61 | +Effectively, any address string specified by [CIP-0019], [CIP-0105] or future extension to either |
| 62 | +of these specifications can be embedded directly within the URI. |
| 63 | + |
| 64 | +### Examples |
| 65 | + |
| 66 | +#### CIP-19 Addresses |
| 67 | + |
| 68 | +```uri |
| 69 | +web+cardano://addr/addr1qx2fxv2umyhttkxyxp8x0dlpdt3k6cwng5pxj3jhsydzer3n0d3vllmyqwsx5wktcd8cc3sq835lu7drv2xwl2wywfgse35a3x |
| 70 | +web+cardano://addr/addr_test1gz2fxv2umyhttkxyxp8x0dlpdt3k6cwng5pxj3jhsydzer5pnz75xxcrdw5vky |
| 71 | +web+cardano://addr/stake1uyehkck0lajq8gr28t9uxnuvgcqrc6070x3k9r8048z8y5gh6ffgw |
| 72 | +web+cardano://addr/stake_test1uqehkck0lajq8gr28t9uxnuvgcqrc6070x3k9r8048z8y5gssrtvn |
| 73 | +``` |
| 74 | + |
| 75 | +#### CIP-105 Addresses |
| 76 | + |
| 77 | +```uri |
| 78 | +web+cardano://addr/drep_vk17axh4sc9zwkpsft3tlgpjemfwc0u5mnld80r85zw7zdqcst6w54sdv4a4e |
| 79 | +web+cardano://addr/drep15k6929drl7xt0spvudgcxndryn4kmlzpk4meed0xhqe25nle07s |
| 80 | +web+cardano://addr/drep_script16pjhzfkm7rqntfezfkgu5p50t0mkntmdruwlp089zu8v29l95rg |
| 81 | +web+cardano://addr/cc_cold_vk149up407pvp9p36lldlp4qckqqzn6vm7u5yerwy8d8rqalse3t04q7qsvwl |
| 82 | +web+cardano://addr/cc_cold1lmaet9hdvu9d9jvh34u0un4ndw3yewaq5ch6fnwsctw02xxwylj |
| 83 | +web+cardano://addr/cc_cold_script14ehj5f64f40xju0086fnunctulkh46mq7munm7upe4hpcwpcat |
| 84 | +web+cardano://addr/cc_cold_script14ehj5f64f40xju0086fnunctulkh46mq7munm7upe4hpcwpcatv |
| 85 | +web+cardano://addr/cc_hot_vk10y48lq72hypxraew74lwjjn9e2dscuwphckglh2nrrpkgweqk5hschnzv5 |
| 86 | +web+cardano://addr/cc_hot17mffcrm3vnfhvyxt7ea3y65e804jfgrk6pjn78aqd9vg7xpq8dv |
| 87 | +web+cardano://addr/cc_hot_script16fayy2wf9myfvxmtl5e2suuqmnhy5zx80vxkezen7xqwskncf40 |
| 88 | +``` |
| 89 | + |
| 90 | +## Rationale: how does this CIP achieve its goals? |
| 91 | + |
| 92 | +By extending [CIP-0013] to allow a [CIP-0019] encoded address to be simply embedded in the URI scheme, |
| 93 | +we enable existing certificate creation tools and public key infrastructure to be used to easily |
| 94 | +create certificates that reference Cardano addresses. |
| 95 | + |
| 96 | +It is envisioned that this extension could have use cases beyond the one presented here. |
| 97 | + |
| 98 | +## Path to Active |
| 99 | + |
| 100 | +### Acceptance Criteria |
| 101 | + |
| 102 | +* [ ] Community Feedback and Review Integrated. |
| 103 | +* [ ] Demonstration of Cardano addresses being embedded in x509 certificates using existing tools. |
| 104 | +* [ ] At least one project utilizing this standard. |
| 105 | + |
| 106 | +### Implementation Plan |
| 107 | + |
| 108 | +Project Catalyst intends to use this standard to facilitate linking of on-chain and off-chain identity |
| 109 | +with x509 certificates. |
| 110 | +This specification does not deal with the processes or proofs required, simply the URI scheme that is |
| 111 | +required to embed a Cardano address in a x509 certificate. |
| 112 | + |
| 113 | +## Copyright |
| 114 | + |
| 115 | +This CIP is licensed under [CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/legalcode). |
| 116 | + |
| 117 | +[CIP-0013]:https://github.com/cardano-foundation/CIPs/blob/master/CIP-0013/ |
| 118 | +[CIP-0019]:https://github.com/cardano-foundation/CIPs/blob/master/CIP-0019/ |
| 119 | +[CIP-0105]:https://github.com/cardano-foundation/CIPs/blob/master/CIP-0105/ |
| 120 | +[x509]:https://datatracker.ietf.org/doc/html/rfc5280 |
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