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

# Verify the hash chain



## OpenAPI

````yaml /openapi.yaml get /admin/verify-hash-chain
openapi: 3.0.3
info:
  title: Centsless Decision and Evidence Engine API
  version: 3.8.1
  description: >
    Jurisdiction-aware cash rounding compliance for point of sale.


    The engine resolves where a sale happened, finds the rule that governs it on
    that date,

    rounds the cash total by the method the rule prescribes, and seals the
    decision and its

    statutory basis into a tamper-evident hash chain.


    Amounts are integers in cents unless a field says otherwise. Timestamps are
    ISO 8601;

    send the terminal's own UTC offset. Authentication is an API key in the
    `x-api-key` header.
  contact:
    name: Centsless developer support
    email: developers@centsless.org
    url: https://www.centsless.org
  license:
    name: Proprietary
    url: https://www.centsless.org/terms
servers:
  - url: https://api.centsless.org/api/v1
    description: Production
security:
  - ApiKeyAuth: []
tags:
  - name: System
    description: Health, version and statistics. No key required for health and version.
  - name: Jurisdiction
    description: Which rule governs a location on a date. No key required.
  - name: Transactions
    description: Process a sale and read sealed transactions.
  - name: Receipts
    description: Render a sealed transaction as a receipt.
  - name: Overrides, voids and refunds
    description: Reversals and adjustments, hash-linked to the original.
  - name: Merchant settings
    description: Early adoption, operator choice and local adoption per merchant.
  - name: Tipping
    description: Tips, pools, payouts and compliance checks.
  - name: Partner
    description: Partner-key endpoints for registering and managing merchants.
  - name: Locations
    description: Registered terminal locations, their boundary resolution and review.
  - name: Compliance and fraud
    description: Void analytics, override reports and risk profiles.
  - name: Audit
    description: Audit logs, security incidents and hash chain verification.
  - name: Export
    description: CSV export.
  - name: Admin
    description: Keys, partners, vendors and jurisdiction rules. Admin key required.
  - name: Provisioning
    description: Called by the Centsless portal backend with the internal service key.
paths:
  /admin/verify-hash-chain:
    get:
      tags:
        - Audit
      summary: Verify the hash chain
      responses:
        '200':
          description: Chain integrity.
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                  chain_integrity:
                    type: object
                    properties:
                      total_transactions:
                        type: integer
                      verified:
                        type: integer
                      broken:
                        type: integer
                      integrity_percentage:
                        type: string
                      breaks:
                        type: array
                        items:
                          type: object
                          properties:
                            transaction_id:
                              type: string
                            position:
                              type: integer
                            expected_hash:
                              type: string
                            actual_hash:
                              type: string
                      source:
                        type: string
                        enum:
                          - database
                          - memory
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key
      description: Role-scoped API key (admin, partner, merchant, auditor, readonly).

````

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