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# Verify a multi-hop delegation chain

POST https://adid.dev/api/v1/delegations/verify-chain
Content-Type: application/json

Reference: https://docs.adid.dev/api-reference/rest-api/agents/verify-delegation-chain

## OpenAPI Specification

```yaml
openapi: 3.1.0
info:
  title: ida
  version: 1.0.0
paths:
  /delegations/verify-chain:
    post:
      operationId: verify-delegation-chain
      summary: Verify a multi-hop delegation chain
      tags:
        - subpackage_agents
      parameters:
        - name: Authorization
          in: header
          description: Bearer authentication
          required: true
          schema:
            type: string
      responses:
        '200':
          description: |
            Verification complete (valid may be true or false; per-hop
            error codes surface in the hops[] array).
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VerifyChainResult'
        '400':
          description: Bad Request (empty chain, depth > 8, or loop detected)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VerifyChainRequest'
servers:
  - url: https://adid.dev/api/v1
  - url: http://localhost:8080/api/v1
components:
  schemas:
    DelegationStep:
      type: object
      properties:
        credentialId:
          type: string
          description: Refers to a delegations row id.
      required:
        - credentialId
      description: One hop in a delegation chain (root → leaf order).
      title: DelegationStep
    VerifyChainRequest:
      type: object
      properties:
        agentDid:
          type: string
          description: Leaf agent DID.
        delegationChain:
          type: array
          items:
            $ref: '#/components/schemas/DelegationStep'
        action:
          type: string
          description: Optional capability that every hop must cover.
      required:
        - agentDid
        - delegationChain
      title: VerifyChainRequest
    VerifyChainHop:
      type: object
      properties:
        delegationId:
          type: string
        issuer:
          type: string
        subject:
          type: string
        capability:
          type: string
        ok:
          type: boolean
        error:
          type: string
          description: >
            Per-hop error code when ok=false. One of:

            HOP_NOT_FOUND, HOP_REVOKED, HOP_EXPIRED, SCOPE_WIDENED,
            SCOPE_MISMATCH,

            ISSUER_NOT_REGISTERED, ISSUER_DECOMMISSIONED, SUBJECT_MISMATCH,
            PARENT_FAILED.
      title: VerifyChainHop
    VerifyChainResult:
      type: object
      properties:
        valid:
          type: boolean
        hopCount:
          type: integer
        hops:
          type: array
          items:
            $ref: '#/components/schemas/VerifyChainHop'
        errors:
          type: array
          items:
            type: string
      required:
        - valid
        - hopCount
        - hops
        - errors
      title: VerifyChainResult
    ErrorError:
      type: object
      properties:
        code:
          type: string
        message:
          type: string
        details:
          type: object
          additionalProperties:
            description: Any type
      title: ErrorError
    Error:
      type: object
      properties:
        error:
          $ref: '#/components/schemas/ErrorError'
      title: Error
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
    apiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key

```

## SDK Code Examples

```python
import requests

url = "https://adid.dev/api/v1/delegations/verify-chain"

payload = {
    "agentDid": "did:ida:agent123456789abcdef",
    "delegationChain": [{ "credentialId": "cred-9876543210abcdef" }]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```javascript
const url = 'https://adid.dev/api/v1/delegations/verify-chain';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"agentDid":"did:ida:agent123456789abcdef","delegationChain":[{"credentialId":"cred-9876543210abcdef"}]}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://adid.dev/api/v1/delegations/verify-chain"

	payload := strings.NewReader("{\n  \"agentDid\": \"did:ida:agent123456789abcdef\",\n  \"delegationChain\": [\n    {\n      \"credentialId\": \"cred-9876543210abcdef\"\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://adid.dev/api/v1/delegations/verify-chain")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"agentDid\": \"did:ida:agent123456789abcdef\",\n  \"delegationChain\": [\n    {\n      \"credentialId\": \"cred-9876543210abcdef\"\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://adid.dev/api/v1/delegations/verify-chain")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"agentDid\": \"did:ida:agent123456789abcdef\",\n  \"delegationChain\": [\n    {\n      \"credentialId\": \"cred-9876543210abcdef\"\n    }\n  ]\n}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://adid.dev/api/v1/delegations/verify-chain', [
  'body' => '{
  "agentDid": "did:ida:agent123456789abcdef",
  "delegationChain": [
    {
      "credentialId": "cred-9876543210abcdef"
    }
  ]
}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://adid.dev/api/v1/delegations/verify-chain");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"agentDid\": \"did:ida:agent123456789abcdef\",\n  \"delegationChain\": [\n    {\n      \"credentialId\": \"cred-9876543210abcdef\"\n    }\n  ]\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = [
  "agentDid": "did:ida:agent123456789abcdef",
  "delegationChain": [["credentialId": "cred-9876543210abcdef"]]
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://adid.dev/api/v1/delegations/verify-chain")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```