# Tvarka ATK API LTV API

**Canonical:** https://apis.io/apis/tvarka/tvarka-ltv-api/  
**Provider:** Tvarka ATK API — https://apis.io/providers/tvarka/  
**Base URL:** https://atk.tvarka.pro/v1  
**Documentation:** https://atk.tvarka.pro/docs/

Tvarka ATK API LTV API is one of 14 APIs that [Tvarka ATK API](https://apis.io/providers/tvarka/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include LTV. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.

Post-signature timestamp and long-term-validation upgrades.

## Operations (3)

| Method | Path | Summary |
|---|---|---|
| POST | `/timestamp` | Add qualified timestamps to untimestamped XAdES signatures |
| POST | `/archive` | Upgrade a PAdES B-T signature to PAdES B-LT |
| GET | `/services/{requestId}/document` | Download timestamp/archive output |

## Machine-readable artifacts (5)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/tvarka/refs/heads/main/openapi/tvarka-ltv-api-openapi.yml
- **PostmanCollection** — https://atk.tvarka.pro/postman/auth.json
- **PostmanCollection** — https://atk.tvarka.pro/postman/sign.json
- **Documentation** — https://atk.tvarka.pro/docs/
- **APIsJSON** — https://atk.tvarka.pro/apis.json

## Other Tvarka ATK API APIs (12)

- [Tvarka ATK API Tvarka ATK API](https://apis.io/apis/tvarka/tvarka-atk-api-tvarka-atk-api-api/)
- [Tvarka ATK API Tvarka ATK QES Signing API (paid Tier Addendum) API](https://apis.io/apis/tvarka/tvarka-atk-api-tvarka-atk-qes-signing-api-paid-tier-addendum-api/)
- [Tvarka Sign API](https://apis.io/apis/tvarka/tvarka-sign-api/)
- [Tvarka ATK API Auth API](https://apis.io/apis/tvarka/tvarka-auth-api/)
- [Tvarka ATK API Batches API](https://apis.io/apis/tvarka/tvarka-batches-api/)
- [Tvarka ATK API Erasure API](https://apis.io/apis/tvarka/tvarka-erasure-api/)
- [Tvarka ATK API Files API](https://apis.io/apis/tvarka/tvarka-files-api/)
- [Tvarka ATK API Pairing API](https://apis.io/apis/tvarka/tvarka-pairing-api/)
- [Tvarka ATK API Signings API](https://apis.io/apis/tvarka/tvarka-signings-api/)
- [Tvarka ATK API Tvarka ATK API](https://apis.io/apis/tvarka/tvarka-tvarka-atk-api-api/)
- [Tvarka ATK API Tvarka Sign API](https://apis.io/apis/tvarka/tvarka-tvarka-sign-api-api/)
- [Tvarka ATK API Validation API](https://apis.io/apis/tvarka/tvarka-validation-api/)

## Tags

LTV

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/tvarka/tvarka-ltv-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/tvarka/.