> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ton.org/llms.txt
> Use this file to discover all available pages before exploring further.
## Submitting Feedback
If you encounter incorrect, outdated, or confusing documentation on this page, submit feedback:
POST https://docs.ton.org/feedback
```json
{
"path": "/ecosystem/api/toncenter/v2/blocks/get-shard-block-proof",
"feedback": "Description of the issue"
}
```
Only submit feedback when you have something specific and actionable to report.
# Get shard block proof
> Returns a Merkle proof that links a shardchain block to a masterchain block. This proof cryptographically verifies that the shard block is part of the canonical chain. Used by light clients and cross-chain bridges to verify shard data without trusting the API.
## OpenAPI
````yaml get /api/v2/getShardBlockProof
openapi: 3.1.1
info:
title: TON HTTP API C++
description: >
This API enables HTTP access to TON blockchain - getting accounts and
wallets information, looking up blocks and transactions, sending messages to
the blockchain, calling get methods of smart contracts, and more.
In addition to REST API, all methods are available through a JSON-RPC
endpoint with `method` equal to method name and `params` passed as a
dictionary.
The response contains a JSON object, which always has a boolean field `ok`
and either `error` or `result`. If `ok` equals true, the request was
successful and the result of the query can be found in the `result` field.
In case of an unsuccessful request, `ok` equals false and the error is
explained in the `error`.
API Key should be sent either as `api_key` query parameter or `X-API-Key`
header
version: 2.1.1
servers:
- url: https://toncenter.com
description: TON Mainnet
- url: https://testnet.toncenter.com
description: TON Testnet
security: []
tags:
- name: Accounts
description: Information about accounts
- name: Transactions
description: Fetching and locating transactions
- name: Blocks
description: Information about blocks
- name: Run method
description: Run get-method of smart contracts
- name: Send
description: Send data to blockchain
- name: Utils
description: Some useful methods
- name: Configuration
description: Information about blockchain config
- name: RPC
description: JSON-RPC and POST endpoints
paths:
/api/v2/getShardBlockProof:
get:
tags:
- Blocks
summary: Get shard block proof
description: >-
Returns a Merkle proof that links a shardchain block to a masterchain
block. This proof cryptographically verifies that the shard block is
part of the canonical chain. Used by light clients and cross-chain
bridges to verify shard data without trusting the API.
operationId: getShardBlockProof_get
parameters:
- $ref: '#/components/parameters/workchain'
- $ref: '#/components/parameters/shard'
- $ref: '#/components/parameters/seqno'
- name: from_seqno
in: query
description: >-
Seqno of masterchain block starting from which proof is required. If
not specified latest masterchain block is used
required: false
schema:
type: integer
format: int32
responses:
'200':
description: >-
Returns a cryptographic proof chain linking a shard block to the
masterchain.
content:
application/json:
schema:
$ref: '#/components/schemas/ShardBlockProofResponse'
'401':
$ref: '#/components/responses/401'
'403':
$ref: '#/components/responses/403'
'422':
$ref: '#/components/responses/422_block'
'429':
$ref: '#/components/responses/429'
'504':
$ref: '#/components/responses/504'
security:
- APIKeyHeader: []
- APIKeyQuery: []
components:
parameters:
workchain:
name: workchain
in: query
description: >-
The workchain to query. Use `-1` for masterchain (validators, system
contracts, config) or `0` for basechain (regular accounts and
contracts). Most user transactions happen on workchain `0`.
required: true
schema:
type: integer
format: int32
shard:
name: shard
in: query
description: >-
The shard identifier. Masterchain always uses `-9223372036854775808`.
For basechain, shards split and merge dynamically. Use the `shards`
endpoint to discover current shard configuration.
required: true
schema:
type: string
x-usrv-cpp-type: std::int64_t
seqno:
name: seqno
in: query
description: >-
Masterchain block sequence number (block height). Used to query state at
a specific point in time. If omitted, returns the current state.
required: true
schema:
type: integer
format: int32
schemas:
ShardBlockProofResponse:
type: object
additionalProperties: false
required:
- ok
- result
properties:
ok:
type: boolean
default: true
description: >-
Returns `true` if the request succeeded; otherwise `false`. See the
`error` field for details.
result:
$ref: '#/components/schemas/ShardBlockProof'
description: Response data. Present only when `ok` is `true`.
'@extra':
type: string
description: >-
Optional request ID that can be passed in the request and received
back in the response. Useful for matching async responses.
ShardBlockProof:
type: object
additionalProperties: false
properties:
'@type':
type: string
enum:
- blocks.shardBlockProof
default: blocks.shardBlockProof
description: >-
TonLib type identifier for shard block proof chains. Refer to the
[TonLib type reference](/ecosystem/api/toncenter/v2-tonlib-types)
for a full list.
from:
$ref: '#/components/schemas/TonBlockIdExt'
description: The shard block being proven.
mc_id:
$ref: '#/components/schemas/TonBlockIdExt'
description: Masterchain block used as trust anchor for the proof.
links:
type: array
items:
$ref: '#/components/schemas/ShardBlockLink'
description: >-
Array of cryptographic links forming a proof chain from the shard
block to the masterchain. Each link contains a block identifier and
a Merkle proof (base64).
mc_proof:
type: array
items:
$ref: '#/components/schemas/BlockLinkBack'
description: >-
Array of masterchain block link proofs. Each entry contains source
and destination block identifiers with corresponding Merkle proofs
(base64) and state proofs (base64).
required:
- '@type'
- from
- mc_id
- links
- mc_proof
TonBlockIdExt:
type: object
additionalProperties: false
properties:
'@type':
type: string
enum:
- ton.blockIdExt
default: ton.blockIdExt
description: >-
TonLib type identifier for full block identifiers. Refer to the
[TonLib type reference](/ecosystem/api/toncenter/v2-tonlib-types)
for a full list.
workchain:
type: integer
description: 'Workchain ID: `-1` for masterchain, `0` for basechain.'
shard:
type: string
x-usrv-cpp-type: std::int64_t
description: >-
Shard identifier as a signed 64-bit integer string. Masterchain uses
`-9223372036854775808`.
seqno:
type: integer
description: >-
Block sequence number within its workchain and shard. For the
masterchain (workchain `-1`), this equals the global block height.
For basechain shards (workchain `0`), this is the sequence number
local to that specific shard, not a global height.
root_hash:
$ref: '#/components/schemas/TonHash'
description: Merkle root hash of the block state tree.
file_hash:
$ref: '#/components/schemas/TonHash'
description: >-
Hash of the serialized block file. Together with `root_hash`,
uniquely identifies a block.
required:
- '@type'
- workchain
- shard
- seqno
- root_hash
- file_hash
description: >-
A complete block identifier with cryptographic hashes. Contains
`workchain`, `shard`, `seqno` (position) plus `root_hash` and
`file_hash` (verification).
ShardBlockLink:
type: object
additionalProperties: false
properties:
'@type':
type: string
enum:
- blocks.shardBlockLink
default: blocks.shardBlockLink
description: >-
TonLib type identifier for shard-to-masterchain proof links. Refer
to the [TonLib type
reference](/ecosystem/api/toncenter/v2-tonlib-types) for a full
list.
id:
$ref: '#/components/schemas/TonBlockIdExt'
description: Block identifier for this link in the proof chain.
proof:
$ref: '#/components/schemas/Bytes'
description: Merkle proof data for this shard block link.
required:
- '@type'
- id
- proof
BlockLinkBack:
type: object
additionalProperties: false
properties:
'@type':
type: string
enum:
- blocks.blockLinkBack
default: blocks.blockLinkBack
description: >-
TonLib type identifier for backward block link proofs. Refer to the
[TonLib type reference](/ecosystem/api/toncenter/v2-tonlib-types)
for a full list.
to_key_block:
type: boolean
description: >-
Returns `true` if the destination block is a key block; otherwise
`false`.
from:
$ref: '#/components/schemas/TonBlockIdExt'
description: Source block in the proof chain.
to:
$ref: '#/components/schemas/TonBlockIdExt'
description: Destination block in the proof chain.
dest_proof:
$ref: '#/components/schemas/Bytes'
description: Cryptographic proof for the destination block.
proof:
$ref: '#/components/schemas/Bytes'
description: Merkle proof linking the two blocks.
state_proof:
$ref: '#/components/schemas/Bytes'
description: State proof validating the block link.
required:
- '@type'
- to_key_block
- from
- to
- dest_proof
- proof
- state_proof
TonHash:
type: string
x-usrv-cpp-type: ton_http::types::ton_hash
description: >-
A 256-bit hash value. Accepts either hex format (64 characters) or
base64 format (44 characters). Used for block hashes, transaction
hashes, and cryptographic proofs.
Bytes:
type: string
x-usrv-cpp-type: ton_http::types::bytes
description: >-
Binary data encoded as base64. Used for serialized cells (BoC format),
message bodies, and smart contract code/data.
responses:
'401':
description: API key does not exist. Check for typos or generate a new key.
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- ok
- code
- error
properties:
ok:
type: boolean
const: false
description: Always `false` for error responses.
code:
type: integer
const: 401
description: HTTP status code `401`.
error:
type: string
enum:
- API key does not exist
'@extra':
type: string
description: Extra data passed through from the request.
example:
ok: false
code: 401
error: API key does not exist
'403':
description: >-
API key is not allowed for this network (e.g. testnet key used on
mainnet).
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- ok
- code
- error
properties:
ok:
type: boolean
const: false
description: Always `false` for error responses.
code:
type: integer
const: 403
description: HTTP status code `403`.
error:
type: string
enum:
- Network not allowed
'@extra':
type: string
description: Extra data passed through from the request.
example:
ok: false
code: 403
error: Network not allowed
'429':
description: >-
Rate limit exceeded. Back off and retry, or use an API key for higher
limits.
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- ok
- code
- error
properties:
ok:
type: boolean
const: false
description: Always `false` for error responses.
code:
type: integer
const: 429
description: HTTP status code `429`.
error:
type: string
enum:
- Ratelimit exceeded
'@extra':
type: string
description: Extra data passed through from the request.
example:
ok: false
code: 429
error: Ratelimit exceeded
'504':
description: Timeout waiting for liteserver response.
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- ok
- code
- error
properties:
ok:
type: boolean
const: false
description: Always `false` for error responses.
code:
type: integer
const: 504
description: HTTP status code `504`.
error:
type: string
enum:
- LITE_SERVER_NETWORK timeout
'@extra':
type: string
description: Extra data passed through from the request.
example:
ok: false
code: 504
error: LITE_SERVER_NETWORK timeout
422_block:
description: Invalid block query parameters.
content:
application/json:
schema:
type: object
additionalProperties: false
required:
- ok
- code
- error
properties:
ok:
type: boolean
const: false
description: Always `false` for error responses.
code:
type: integer
const: 422
description: HTTP status code `422`.
error:
type: string
enum:
- workchain required
- shard required
- seqno required
- failed to parse workchain
- failed to parse shard
- failed to parse root_hash
- failed to parse seqno
- seqno should be positive
- from_seqno should be non-negative
'@extra':
type: string
description: Extra data passed through from the request.
example:
ok: false
code: 422
error: workchain required
securitySchemes:
APIKeyHeader:
type: apiKey
in: header
name: X-API-Key
description: >-
API key header of the form `X-API-Key: `, where `` is the
API key. Requests without a key are limited to 1 RPS. Refer to the
[authentication guide](/ecosystem/api/toncenter/v2-authentication) for
details.
APIKeyQuery:
type: apiKey
in: query
name: api_key
description: >-
API key query parameter of the form `?api_key=`, where ``
is the API key. Equivalent to the header method. Refer to the
[authentication guide](/ecosystem/api/toncenter/v2-authentication) for
details.
````