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ADR 005: DID Resolution & DID URL Dereferencing

Architecture Decision Record (ADR) describing how DID resolvers handle DID URL queries, paths and fragments for DIDs and DID-Linked Resources.

Status

Summary

The defines how DIDs are created and read from ledger. According to the , DID methods are expected to provide .

The is designed to implement the for method.

Part of the is the notion of DID URL Dereferencing whereby a DID URL identifies either a primary or secondary resource which is returned directly.

Understanding DID resolution vs DID URL dereferencing

When you resolve a DID you get a DID Document.

When you dereference a DID, you may get the DID Document, a portion of a DID document, or the resource at the end of a service endpoint (if the DID contains a service component).

You can only resolve a DID to return a DID document, and you can only dereference a DID reference to return whatever resource is referenced.

Process for dereferencing a DID URL

Normal dereferencing can be conceived in two steps:

A is resolved to a ;
A resource within / associated with the is identified, based on the portion of the that follows the (path, query, fragment as defined by the ABNF in .).

DID Document Dereferencing Operations

Simple DID Resolution

Endpoint: /1.0/identifiers/<did>

Current implementation returns here the full DIDDoc as in . By default, in didDocumentMetadata section will be the metadata for the latest version of DIDDoc and the list of all resources.

DID URL with fragment

Endpoint: /1.0/identifiers/<did>#example

If a DID URL contains a fragment #. the logic is similar to the general web browser logic where # symbols can be used for linking to the particular document section.

For the DIDDoc, you can equate a specific section within a webpage to a specific section inside the DIDDoc, for example verificationMethod. To resolve to a particular section, we need to use a request which specifies the section itself.

Take the example excerpt from a DIDDoc below:

Here, to dereference to this verificationMethod, we need to pass key-1 as a fragment parameter:

Example:

Request format

Response format

DID URL with query

All the queries can be divided into 2 main groups:

Queries for fetching a resource referenced within the DIDDoc body.
Queries for fetching an external resource associated with the DIDDoc, referenced within the DIDDoc metadata.

Note: in instances where there is no versionId or versionTime parameters specfied, we have set the default dereferencing rules to fetch the latest version of a resource, if it is uniquely identified by the parameters in the query.

Common parameter validation

parameters metadata and resourceMetadata are designed to be a bool variables, like true or false.
parameters versionTime and resourceVersionTime are designed as string representation of time and can be in 2 formats, RFC3339 and RFC3339Nano. Examples are ("2006-01-02T15:04:05Z07:00" and "2006-01-02T15:04:05.999999999Z07:00")

Query parameters

Here we have an ability to specify different parameters to filter to particular parts of a DIDDoc.

Parameter

Type

Description

All queries can be chained together to make very specific requests using & within the request format. This makes query parameters particularly powerful because they can be used to fetch specific parts of a DID Document or specific resources associated with a DID Document.

For example, the example below queries a particular service endpoint associated with a particular DIDDoc version.

VersionId

If the user knows the particular versionId he could ask about it by adding the query versionId=<uuid of DIDDoc version> It can be combined with any other queries for building more complex requests. linkedResourceMetadata will contain only resources which were active for this version. In other words, resource which were created before the next version in terms of timeline.

Example:

Request format

Response format

VersionTime

The user could ask resolver for the nearest DIDDoc which was created/updated before versionTime value. The logic about linkedResourceMetadata is the same. Here, resolver figure out what the versionId is the nearest one for versionTime and shows all the active resources. If you want to file resources also, you can use parameter and combine the query with versionTime.

Example:

Request format

Response format

TransformKeys

The transformKeys parameter changes the representation of verificationMethod section in DIDDoc. It allows you to change publicKey representation into the one of next variants. To do so, just pass the parameter transfromKeys with one of the following values:

Ed25519VerificationKey2020
Ed25519VerificationKey2018
JsonWebKey2020

Example:

Request format

Response format

Service

Service - is a DIDDoc section which includes serviceEndpoint field with URL inside. As a result, pair service=<service-id> will redirect to the serviceEndpoint value.

Example:

Request format

Response format

RelativeRef

relativeRef is an additional part for serviceEndpoint and can be used only with parameter. It combines serviceEndpoint URL with relativeRef value and does the redirect to the URL.

Example:

Request format

Response format

Metadata

By default, without metadata=true pair DID-resolver returns only particular DIDDoc. If you want to specifically fetch only the metadata for a DIDDoc, you can pass an additional query. It can be helpful in the instance, for example, where you want to get all the resources which were created for the exact versionId or before versionTime.

Example:

Request format

Response format

Errors

NotFoundError raises if there is now resource/metadata with requested set of parameters or the result is ambiguous
RepresentationNotSupported raises if there are:

Dereferencing to a DID-Linked Resource

cheqd's introduces a new concept to the SSI ecosystem - namely, resources that can be associated with a DID and fetched using existing DID URL dereferencing patterns.

The diagram below shows how a DID-Linked Resource sits beneath a DID and can be fetched using a DID URL.

DID-Linked Resource resolution rules

Requests to fetch on-ledger cheqd Resources are considered as a DID URL Dereferencing scenario it uses to lead to a Resource object, rather than a DIDDoc.

On the other hand, on-ledger cheqd Resources metadata requests are handled like DID URL Resolution since the result is a subsection of didDocumentMetadata specific to that resource.

API endpoints related to on-ledger cheqd Resources are described below. All of these request types are GET requests, with POST and PUT requests disallowed.

Get a specific Resource

Returns the Resource data/payload stored on ledger for specified resource. HEAD request type is also allowed for this endpoint since it can be used for phase by client applications. In this case, only the HTTP Response headers are returned without the body.

Endpoint: /1.0/identifiers/<did>/resources/<resource_id>

Request HTTP headers
1. Accept should allow */* or match the mediaType of the Resource

Get metadata for a specific resource

Return metadata for a specified resource. This is effectively a portion of the DIDDoc Metadata block.

Endpoint: /1.0/identifiers/<did>/resources/<resource_id>/metadata

Get metadata for all Resources linked to a DID

Returns metadata for all Resources directly linked to/controlled by a DID. This is effectively the full linkedResourceMetadata section in DIDDoc Metadata block.

Endpoint: /1.0/identifiers/<did>/resources/all

Alternative endpoints

/1.0/identifiers/<did>/resources/
1. Status code 301
2. Redirect to /resources/all

Query parameters

Here we have an ability to specify different parameters to filter to particular DID-Linked Resources.

Parameter

Type

Description

Like with DIDDoc query parameters, these can all be chained together to create complex requests for specific DID-Linked Resources at particular points in time or associated with particular DIDDoc versions.

Rules and logic for handling ambiguous queries

It is important to understand how our resolver logically handles more complex dereferencing requests. We have set some baseline defaults and rules to ensure a logical and consistent experience for clients who use our resolver.

Ambiguity generally throws an error

If the request specifies a parameter where there are multiple potential results, such as where the DID has two resources of the same resourceType ('String') but resourceName is not the same, an error will be thrown because there is not enough information to discern which resource is being requested.

Multiple versions of the same resource

If there are multiple resources with the same resourceType and resourceName but with different versionIds, and there is no parameter specified to fetch a particular version, the resolver will fetch the latest resource by default.

This is because the query is not ambiguous in terms of discerning which set of resources to dereference to, but is only ambiguous in terms of which version of that resource to fetch.

Ambiguity + resourceMetadata=true

If there is an ambiguous query, such as where there are two resources with the same name but different types, AND there is a resourceMetadata=true parameter, resource data pertaining to all the resources which could potentially be seen as being ambiguous will be returned.

For example, in the below example, there are multiple resources with the resourceType= string, but with different resourceName parameters:

Request format

Response format

ResourceId

ResourceId parameter can be used for filtering a particular resource version by specifically identifying its unique ID.

Example:

Request format

Response format

ResourceCollectionId

resourceCollectionId parameter filters all the resource by collectionId field. By default cause we are asking for resources for a particular DID it already includes all the resource with the same collectionId and this parameter can used mostly as sanity check. Without resourceMetadata=true parameter will return the latest created resource if there is only one resource or an unambiguous resource.

Example:

Request format

Response format

ResourceType

This parameter is also just a filter by Type field through resources. But there is a corner case if the user asks about exact resource (exact data). If after applying all the parameters in request several resources are left with the same Name - the latest one will be responded. Otherwise - error NotFoundError will be raised.

Example:

Request format

Response format

ResourceName

Behavior of this parameter is similar with one. If there is no ambiguous resource, it will be fetched. Otherwise greater specifity is required.

Example:

Request format

Response format

ResourceVersion

This parameter filters by Version field. We introduced it with latest network upgrade and can be optionally set to identify a version of a resource with a particular string.

Example:

Request format

Response format

ResourceVersionTime

Important: This parameter must always be accompanied by another resource query qualifier.

The main goal here is to get the nearest resource for resourceVersionTime value. "Nearest" means that if we are asking for time between resource1 and resource2 were created - resource1 will be returned. In case if requested resourceVersionTime is before the first resource created - NotFoundError will be returned. The most useful use-case here is checking that some "Credential" (driver's license) was active at resourceVersionTime (was not revoked from Revocation Registry for example).

Example:

Request format

Response format

Checksum

It just checks that checksum is the same as resource's metadata and also can used as a sanity check. For example, if the user knows what is exact checksum then it may be checked before actual downloading.

Example:

Request format

Response format

ResourceMetadata

This parameter a kind of modifier which works in the same manner as but applies to resources. It allows to get only Metadata information about resource(s) without downloading. Also it changes the flow for resourceType and resourceName parameters and general meaning of this parameter - just filter. So, here it allows to create a chain of parameters and apply all of them to the resourceCollection and get only interested resource metadata. Possible variants:

resourceMetadata=true
resourceMetadata=false
Unused

Example:

Request format

Response format

HTTP headers and associated rules

The cheqd DID Resolver complies with the rules and algorithm defined in . This section clarifies and expands some descriptions specific to cheqd.

The section states that:

If the output of the DID URL dereferencing function contains the didDocumentStream:
If the value of the Accept HTTP header is absent or application/did+ld+json (or other media type of a conformant representation of a DID document):

Since the cheqd DID Resolver APIs are REST APIs, the default Content-Type: application/did+ld+json encoding is used if the Accept header is not explicitly set since it matches the Accept: */* header that most client applications send.

`Accept` header is `application/did+ld+json` OR blank OR `/`

Response HTTP headers
- Status code 200 OK
- Content-Type: application/did+ld+json

`Accept` request HTTP header contains `application/ld+json;profile="https://w3id.org/did-resolution"`

Response HTTP headers
- Status code 200 OK
- Content-Type: application/ld+json;profile="https://w3id.org/did-resolution

`Accept` request HTTP header contains `application/did+json`

Response HTTP headers
- Status code 200 OK
- Content-Type: application/did+json

Error handling

The DID Resolution specification should be handled. The cheqd DID Resolver aims to implement all of these scenarios, with the encountered.

DID Resolution errors

The DID resolution output should always conform to the following format: ( didResolutionMetadata, didDocument, didDocumentMetadata )

If the resolution is unsuccessful, the DID resolver should return the following result:

didResolutionMetadata contains "error" : "<Error message>"
didDocument: null

DID URL Dereferencing errors

The DID dereferencing output should always conform to the following format: ( dereferencingMetadata, contentStream, contentMetadata )

dereferencingMetadata contains "error" : "<Error message>"
contentStream: null

ADR 005: DID Resolution & DID URL Dereferencing

Architecture Decision Record (ADR) describing how DID resolvers handle DID URL queries, paths and fragments for DIDs and DID-Linked Resources.

Status

Summary

The defines how DIDs are created and read from ledger. According to the , DID methods are expected to provide .

The is designed to implement the for method.

Part of the is the notion of DID URL Dereferencing whereby a DID URL identifies either a primary or secondary resource which is returned directly.

Understanding DID resolution vs DID URL dereferencing

When you resolve a DID you get a DID Document.

When you dereference a DID, you may get the DID Document, a portion of a DID document, or the resource at the end of a service endpoint (if the DID contains a service component).

You can only resolve a DID to return a DID document, and you can only dereference a DID reference to return whatever resource is referenced.

Process for dereferencing a DID URL

Normal dereferencing can be conceived in two steps:

A is resolved to a ;
A resource within / associated with the is identified, based on the portion of the that follows the (path, query, fragment as defined by the ABNF in .).

DID Document Dereferencing Operations

Simple DID Resolution

Endpoint: /1.0/identifiers/<did>

Current implementation returns here the full DIDDoc as in . By default, in didDocumentMetadata section will be the metadata for the latest version of DIDDoc and the list of all resources.

DID URL with fragment

Endpoint: /1.0/identifiers/<did>#example

If a DID URL contains a fragment #. the logic is similar to the general web browser logic where # symbols can be used for linking to the particular document section.

Take the example excerpt from a DIDDoc below:

Here, to dereference to this verificationMethod, we need to pass key-1 as a fragment parameter:

Example:

Request format

Response format

DID URL with query

All the queries can be divided into 2 main groups:

Queries for fetching a resource referenced within the DIDDoc body.
Queries for fetching an external resource associated with the DIDDoc, referenced within the DIDDoc metadata.

Common parameter validation

parameters metadata and resourceMetadata are designed to be a bool variables, like true or false.
parameters versionTime and resourceVersionTime are designed as string representation of time and can be in 2 formats, RFC3339 and RFC3339Nano. Examples are ("2006-01-02T15:04:05Z07:00" and "2006-01-02T15:04:05.999999999Z07:00")

Query parameters

Here we have an ability to specify different parameters to filter to particular parts of a DIDDoc.

Parameter

Type

Description

For example, the example below queries a particular service endpoint associated with a particular DIDDoc version.

VersionId

Example:

Request format

Response format

VersionTime

Example:

Request format

Response format

TransformKeys

Ed25519VerificationKey2020
Ed25519VerificationKey2018
JsonWebKey2020

Example:

Request format

Response format

Service

Service - is a DIDDoc section which includes serviceEndpoint field with URL inside. As a result, pair service=<service-id> will redirect to the serviceEndpoint value.

Example:

Request format

Response format

RelativeRef

relativeRef is an additional part for serviceEndpoint and can be used only with parameter. It combines serviceEndpoint URL with relativeRef value and does the redirect to the URL.

Example:

Request format

Response format

Metadata

Example:

Request format

Response format

Errors

NotFoundError raises if there is now resource/metadata with requested set of parameters or the result is ambiguous
RepresentationNotSupported raises if there are:

Dereferencing to a DID-Linked Resource

cheqd's introduces a new concept to the SSI ecosystem - namely, resources that can be associated with a DID and fetched using existing DID URL dereferencing patterns.

The diagram below shows how a DID-Linked Resource sits beneath a DID and can be fetched using a DID URL.

DID-Linked Resource resolution rules

Requests to fetch on-ledger cheqd Resources are considered as a DID URL Dereferencing scenario it uses to lead to a Resource object, rather than a DIDDoc.

On the other hand, on-ledger cheqd Resources metadata requests are handled like DID URL Resolution since the result is a subsection of didDocumentMetadata specific to that resource.

API endpoints related to on-ledger cheqd Resources are described below. All of these request types are GET requests, with POST and PUT requests disallowed.

Get a specific Resource

Endpoint: /1.0/identifiers/<did>/resources/<resource_id>

Request HTTP headers
1. Accept should allow */* or match the mediaType of the Resource

Get metadata for a specific resource

Return metadata for a specified resource. This is effectively a portion of the DIDDoc Metadata block.

Endpoint: /1.0/identifiers/<did>/resources/<resource_id>/metadata

Get metadata for all Resources linked to a DID

Returns metadata for all Resources directly linked to/controlled by a DID. This is effectively the full linkedResourceMetadata section in DIDDoc Metadata block.

Endpoint: /1.0/identifiers/<did>/resources/all

Alternative endpoints

/1.0/identifiers/<did>/resources/
1. Status code 301
2. Redirect to /resources/all

Query parameters

Here we have an ability to specify different parameters to filter to particular DID-Linked Resources.

Parameter

Type

Description

Rules and logic for handling ambiguous queries

Ambiguity generally throws an error

Multiple versions of the same resource

This is because the query is not ambiguous in terms of discerning which set of resources to dereference to, but is only ambiguous in terms of which version of that resource to fetch.

Ambiguity + resourceMetadata=true

For example, in the below example, there are multiple resources with the resourceType= string, but with different resourceName parameters:

Request format

Response format

ResourceId

ResourceId parameter can be used for filtering a particular resource version by specifically identifying its unique ID.

Example:

Request format

Response format

ResourceCollectionId

Example:

Request format

Response format

ResourceType

Example:

Request format

Response format

ResourceName

Behavior of this parameter is similar with one. If there is no ambiguous resource, it will be fetched. Otherwise greater specifity is required.

Example:

Request format

Response format

ResourceVersion

This parameter filters by Version field. We introduced it with latest network upgrade and can be optionally set to identify a version of a resource with a particular string.

Example:

Request format

Response format

ResourceVersionTime

Important: This parameter must always be accompanied by another resource query qualifier.

Example:

Request format

Response format

Checksum

Example:

Request format

Response format

ResourceMetadata

resourceMetadata=true
resourceMetadata=false
Unused

Example:

Request format

Response format

HTTP headers and associated rules

The cheqd DID Resolver complies with the rules and algorithm defined in . This section clarifies and expands some descriptions specific to cheqd.

The section states that:

If the output of the DID URL dereferencing function contains the didDocumentStream:
If the value of the Accept HTTP header is absent or application/did+ld+json (or other media type of a conformant representation of a DID document):

`Accept` header is `application/did+ld+json` OR blank OR `/`

Response HTTP headers
- Status code 200 OK
- Content-Type: application/did+ld+json

`Accept` request HTTP header contains `application/ld+json;profile="https://w3id.org/did-resolution"`

Response HTTP headers
- Status code 200 OK
- Content-Type: application/ld+json;profile="https://w3id.org/did-resolution

`Accept` request HTTP header contains `application/did+json`

Response HTTP headers
- Status code 200 OK
- Content-Type: application/did+json

Error handling

The DID Resolution specification should be handled. The cheqd DID Resolver aims to implement all of these scenarios, with the encountered.

DID Resolution errors

The DID resolution output should always conform to the following format: ( didResolutionMetadata, didDocument, didDocumentMetadata )

If the resolution is unsuccessful, the DID resolver should return the following result:

didResolutionMetadata contains "error" : "<Error message>"
didDocument: null

DID URL Dereferencing errors

The DID dereferencing output should always conform to the following format: ( dereferencingMetadata, contentStream, contentMetadata )

dereferencingMetadata contains "error" : "<Error message>"
contentStream: null

{
    "@context": "https://w3id.org/did-resolution/v1",
    "dereferencingMetadata": {
        "contentType": "application/did+ld+json",
        "retrieved": "2023-04-27T11:10:17Z",
        "did": {
            "didString": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
            "methodSpecificId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
            "method": "cheqd"
        }
    },
    "contentStream": {
        "created": "2023-02-21T14:28:47.406713879Z",
        "versionId": "44f49254-8106-40ee-99ad-e50ac9517346",
        "linkedResourceMetadata": [
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/bae5cb6c-564a-4ed4-8c0e-d5c3b0f8ae0a",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "bae5cb6c-564a-4ed4-8c0e-d5c3b0f8ae0a",
                "resourceName": "test11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.38.00219791272952",
                "created": "2023-02-22T08:57:23.341829704Z",
                "checksum": "93ba6f3c55ee073e6278f98e820776e73cfd9d3e32dc5882507ee8effbdbfadd",
                "previousVersionId": "40829caf-b415-4b1d-91a3-b56dfb6374f4",
                "nextVersionId": null
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/40829caf-b415-4b1d-91a3-b56dfb6374f4",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "40829caf-b415-4b1d-91a3-b56dfb6374f4",
                "resourceName": "test11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.45.245928566483904",
                "created": "2023-02-22T08:55:07.547309938Z",
                "checksum": "2a6af570635ed49a39eae9a9c60ccb40d61466839d4ab2f17432a8ac705da489",
                "previousVersionId": "547abdb3-99f8-4040-b030-3296c4668846",
                "nextVersionId": "bae5cb6c-564a-4ed4-8c0e-d5c3b0f8ae0a"
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/547abdb3-99f8-4040-b030-3296c4668846",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "547abdb3-99f8-4040-b030-3296c4668846",
                "resourceName": "test11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.42.26264376650386",
                "created": "2023-02-22T08:54:14.484707292Z",
                "checksum": "4524f2193da6e5cc28d8a71f268d097891d053d4f206b045347ae117ce70d8ac",
                "previousVersionId": null,
                "nextVersionId": "40829caf-b415-4b1d-91a3-b56dfb6374f4"
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/897368de-e6c5-44ac-a256-2bd02330ab5b",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "897368de-e6c5-44ac-a256-2bd02330ab5b",
                "resourceName": "test - 11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.96.35140535691139",
                "created": "2023-02-22T07:35:25.81556714Z",
                "checksum": "4e64170b0b1aedd66b15c7a5644157519ed0d30dfc4df69989310dbef2f7bd60",
                "previousVersionId": "9f41aca5-bbdf-473d-88cb-4dfb78671ffe",
                "nextVersionId": null
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/9f41aca5-bbdf-473d-88cb-4dfb78671ffe",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "9f41aca5-bbdf-473d-88cb-4dfb78671ffe",
                "resourceName": "test - 11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.1.6636632864708512",
                "created": "2023-02-22T07:33:32.80237235Z",
                "checksum": "8847e6b3b935d1c281fe714872edfa3755f45531217dca87f33daae53f43dc64",
                "previousVersionId": "64d5e85c-365c-4457-ab0c-c32f19449f58",
                "nextVersionId": "897368de-e6c5-44ac-a256-2bd02330ab5b"
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/64d5e85c-365c-4457-ab0c-c32f19449f58",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "64d5e85c-365c-4457-ab0c-c32f19449f58",
                "resourceName": "test - 11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.31.68736260709204",
                "created": "2023-02-22T07:06:23.964025795Z",
                "checksum": "c65b1d18da23ea0c918cd2a86d151946856a368adcaa04e91e7938e1f65064a6",
                "previousVersionId": "e4e32646-69a0-40ef-af9d-235cb0b6a108",
                "nextVersionId": "9f41aca5-bbdf-473d-88cb-4dfb78671ffe"
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/e4e32646-69a0-40ef-af9d-235cb0b6a108",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "e4e32646-69a0-40ef-af9d-235cb0b6a108",
                "resourceName": "test - 11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.56.91909743350392",
                "created": "2023-02-22T06:59:47.570665615Z",
                "checksum": "4c5e3136eb7e00f88145af3f100c252c366cbd97ca60efc99916cf4f1e66f7de",
                "previousVersionId": "31fa6841-bcda-4a3c-abd3-261e1b244d3c",
                "nextVersionId": "64d5e85c-365c-4457-ab0c-c32f19449f58"
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/31fa6841-bcda-4a3c-abd3-261e1b244d3c",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "31fa6841-bcda-4a3c-abd3-261e1b244d3c",
                "resourceName": "test - 11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
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                "mediaType": "application/json",
                "resourceVersion": "1.66.73560282313116",
                "created": "2023-02-22T06:42:49.403227253Z",
                "checksum": "d81a6caf78ed4e7ee983acd8b2db2ba97f84a95ec35c3a9f97a5f56d0f4e7b2e",
                "previousVersionId": "12e7385c-9815-4094-a8de-50b0f8713508",
                "nextVersionId": "9c280ef5-96d6-423c-a5eb-e397d82317ea"
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/12e7385c-9815-4094-a8de-50b0f8713508",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "12e7385c-9815-4094-a8de-50b0f8713508",
                "resourceName": "test - 11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.52.437822168723436",
                "created": "2023-02-22T06:31:46.632577547Z",
                "checksum": "e94bcb65a758753c1b66332c5d1878c2b87b959c3af7f94b5a5d81ed241292fa",
                "previousVersionId": "eee49898-c80d-4862-a7db-73c7aa9a6c88",
                "nextVersionId": "9b6d5a3f-2dd4-4d14-b940-96967239f933"
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/eee49898-c80d-4862-a7db-73c7aa9a6c88",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "eee49898-c80d-4862-a7db-73c7aa9a6c88",
                "resourceName": "test - 11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.14.189123052353757",
                "created": "2023-02-22T06:27:44.050370138Z",
                "checksum": "7b4f4a81fc39a920bc1a4e0bff0e9ff1c91057702dd920dd1936090db099f76d",
                "previousVersionId": "319f8889-8bbe-4fc6-b5a4-638ba58390a2",
                "nextVersionId": "12e7385c-9815-4094-a8de-50b0f8713508"
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/319f8889-8bbe-4fc6-b5a4-638ba58390a2",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "319f8889-8bbe-4fc6-b5a4-638ba58390a2",
                "resourceName": "test - 11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.60.10585488950264",
                "created": "2023-02-22T06:24:34.178043845Z",
                "checksum": "5c259086d4676d6fe06e447776c8e55f04e6e01d98489b2a85d3a35d8f50e732",
                "previousVersionId": "57a091e6-aafb-4c88-81fe-508a51c92491",
                "nextVersionId": "eee49898-c80d-4862-a7db-73c7aa9a6c88"
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/57a091e6-aafb-4c88-81fe-508a51c92491",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "57a091e6-aafb-4c88-81fe-508a51c92491",
                "resourceName": "test - 11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.0.8322705530387609",
                "created": "2023-02-22T06:21:06.651892018Z",
                "checksum": "9737d5e62aa4ea8903e11d9322782b5c5349a37ffecca17b8b0165941ca084aa",
                "previousVersionId": "ffd001c2-1f80-4cd8-84b2-945fba309457",
                "nextVersionId": "319f8889-8bbe-4fc6-b5a4-638ba58390a2"
            },
            {
                "resourceURI": "did:cheqd:testnet:d8ac0372-0d4b-413e-8ef5-8e8f07822b2c/resources/ffd001c2-1f80-4cd8-84b2-945fba309457",
                "resourceCollectionId": "d8ac0372-0d4b-413e-8ef5-8e8f07822b2c",
                "resourceId": "ffd001c2-1f80-4cd8-84b2-945fba309457",
                "resourceName": "test - 11",
                "resourceType": "anonCredsSchema",
                "mediaType": "application/json",
                "resourceVersion": "1.40.23710152624007",
                "created": "2023-02-21T14:29:04.895533682Z",
                "checksum": "2f95be447ce790c337767af65cc65e7312244bfd7f2a3ee0886e4c7956be3cee",
                "previousVersionId": null,
                "nextVersionId": "57a091e6-aafb-4c88-81fe-508a51c92491"
            }
        ]
    },
    "contentMetadata": {}
}

ADR 005: DID Resolution & DID URL Dereferencing

hashtagStatus

hashtagSummary

hashtagUnderstanding DID resolution vs DID URL dereferencing

hashtagProcess for dereferencing a DID URL

hashtagDID Document Dereferencing Operations

hashtagSimple DID Resolution

hashtagDID URL with fragment

hashtagDID URL with query

hashtagQuery parameters

hashtagErrors

hashtagDereferencing to a DID-Linked Resource

hashtagDID-Linked Resource resolution rules

hashtagGet a specific Resource

hashtagGet metadata for a specific resource

hashtagGet metadata for all Resources linked to a DID

hashtagQuery parameters

hashtagRules and logic for handling ambiguous queries

hashtagHTTP headers and associated rules

hashtagAccept header is application/did+ld+json OR blank OR */*

hashtagAccept request HTTP header contains application/ld+json;profile="https://w3id.org/did-resolution"

hashtagAccept request HTTP header contains application/did+json

hashtagError handling

hashtagDID Resolution errors

hashtagDID URL Dereferencing errors

ADR 005: DID Resolution & DID URL Dereferencing

hashtagStatus

hashtagSummary

hashtagUnderstanding DID resolution vs DID URL dereferencing

hashtagProcess for dereferencing a DID URL

hashtagDID Document Dereferencing Operations

hashtagSimple DID Resolution

hashtagDID URL with fragment

hashtagDID URL with query

hashtagQuery parameters

hashtagErrors

hashtagDereferencing to a DID-Linked Resource

hashtagDID-Linked Resource resolution rules

hashtagGet a specific Resource

hashtagGet metadata for a specific resource

hashtagGet metadata for all Resources linked to a DID

hashtagQuery parameters

hashtagRules and logic for handling ambiguous queries

hashtagHTTP headers and associated rules

hashtagAccept header is application/did+ld+json OR blank OR */*

hashtagAccept request HTTP header contains application/ld+json;profile="https://w3id.org/did-resolution"

hashtagAccept request HTTP header contains application/did+json

hashtagError handling

hashtagDID Resolution errors

hashtagDID URL Dereferencing errors

Status

Summary

Understanding DID resolution vs DID URL dereferencing

Process for dereferencing a DID URL

DID Document Dereferencing Operations

Simple DID Resolution

DID URL with fragment

DID URL with query

Query parameters

Errors

Dereferencing to a DID-Linked Resource

DID-Linked Resource resolution rules

Get a specific Resource

Get metadata for a specific resource

Get metadata for all Resources linked to a DID

Query parameters

Rules and logic for handling ambiguous queries

HTTP headers and associated rules

`Accept` header is `application/did+ld+json` OR blank OR `/`

`Accept` request HTTP header contains `application/ld+json;profile="https://w3id.org/did-resolution"`

`Accept` request HTTP header contains `application/did+json`

Error handling

DID Resolution errors

DID URL Dereferencing errors

Status

Summary

Understanding DID resolution vs DID URL dereferencing

Process for dereferencing a DID URL

DID Document Dereferencing Operations

Simple DID Resolution

DID URL with fragment

DID URL with query

Query parameters

Errors

Dereferencing to a DID-Linked Resource

DID-Linked Resource resolution rules

Get a specific Resource

Get metadata for a specific resource

Get metadata for all Resources linked to a DID

Query parameters

Rules and logic for handling ambiguous queries

HTTP headers and associated rules

`Accept` header is `application/did+ld+json` OR blank OR `/`

`Accept` request HTTP header contains `application/ld+json;profile="https://w3id.org/did-resolution"`

`Accept` request HTTP header contains `application/did+json`

Error handling

DID Resolution errors

DID URL Dereferencing errors