---
title: "Get information required to generate a consistency proof for the transparency log"
method: GET
path: "/api/v1/log/proof"
tags: ["tlog"]
---

# Get information required to generate a consistency proof for the transparency log

`GET /api/v1/log/proof`

Returns a list of hashes for specified tree sizes that can be used to confirm the consistency of the transparency log

## Query parameters

- `firstSize` integer
- `lastSize` integer, required
- `treeID` string

## Response `200`

All hashes required to compute the consistency proof

- ConsistencyProof
  - `rootHash` string, required — The hash value stored at the root of the merkle tree at the time the proof was generated
  - `hashes` string[], required

## Other responses

- `400` — The content supplied to the server was invalid
- `default` — There was an internal error in the server while processing the request

## Changes

- **2022-03-16** `50a77115867d` — 1 info
  - added the new optional `query` request parameter `treeID`
- **2021-01-28** `a6c8f19ce1c3` — 1 warning
  - deleted the `query` request parameter `treeID`

[Change history](https://skmtc.dev/sigstore/apis/rekor/changes/api/v1/log/proof/get.md)

---

[API](https://skmtc.dev/sigstore/apis/rekor.md) · [All operations](https://skmtc.dev/sigstore/apis/rekor/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/sigstore/rekor/revisions/35007e4582f4/schema)