> ## Documentation Index
> Fetch the complete documentation index at: https://docs.qedproof.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Get the signed tree head

> The log's current size and root, signed by QED Proof's receipt key under its own domain (`POAW-TREE-HEAD-V0`, SPEC §8.5), plus the latest anchor on Base Sepolia (testnet) with its block. Free and public: no key, any site may call it from a browser. Compare heads over time with Get a consistency proof to confirm nothing was rewritten.



## OpenAPI

````yaml /api-reference/openapi.json get /v1/log/head
openapi: 3.1.0
info:
  description: 'The public HTTP API of QED Proof. Guides: https://docs.qedproof.site'
  title: QED Proof API
  version: 0.1.0
servers:
  - url: https://api.qedproof.site
security: []
paths:
  /v1/log/head:
    get:
      summary: Get the signed tree head
      description: >-
        The log's current size and root, signed by QED Proof's receipt key under
        its own domain (`POAW-TREE-HEAD-V0`, SPEC §8.5), plus the latest anchor
        on Base Sepolia (testnet) with its block. Free and public: no key, any
        site may call it from a browser. Compare heads over time with Get a
        consistency proof to confirm nothing was rewritten.
      operationId: log_head_v1_log_head_get
      responses:
        '200':
          content:
            application/json:
              schema:
                additionalProperties: true
                title: Response Log Head V1 Log Head Get
                type: object
          description: Successful Response
        '429':
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          description: Rate limit exceeded.
components:
  schemas:
    Error:
      properties:
        detail:
          description: What went wrong, in plain words.
          type: string
      required:
        - detail
      title: Error
      type: object

````

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