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GET
/
getBlockHeader
getBlockHeader
curl --request GET \
  --url https://ton-mainnet.core.chainstack.com/f2a2411bce1e54a2658f2710cd7969c3/api/v2/getBlockHeader
{
  "id": {
    "workchain": 123,
    "shard": "<string>",
    "seqno": 123,
    "root_hash": "<string>",
    "file_hash": "<string>"
  },
  "global_id": 123,
  "version": 123,
  "after_merge": true,
  "before_split": true,
  "after_split": true,
  "want_merge": true,
  "want_split": true,
  "validator_list_hash_short": 123,
  "catchain_seqno": 123,
  "min_ref_mc_seqno": 123,
  "is_key_block": true,
  "prev_key_block_seqno": 123,
  "start_lt": "<string>",
  "end_lt": "<string>",
  "gen_utime": 123,
  "vert_seqno": 123
}
The getBlockHeader method retrieves the header of a specific block in the TON blockchain. This method provides detailed metadata about a block, including its identifiers, state flags, and timing information.
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​
Parameters

  • workchain (integer, required) — The ID of the workchain. Example: -1 for the masterchain.
  • shard (string, required) — The ID of the shard. Example: "-9223372036854775808" for the masterchain.
  • seqno (integer, required) — The sequence number of the block. Example: 39064874.

​
JSON-RPC example

Shell
curl -X POST \
  'https://ton-mainnet.core.chainstack.com/f2a2411bce1e54a2658f2710cd7969c3/api/v2/jsonRPC' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getBlockHeader",
    "params": {
      "workchain": -1,
      "shard": "-9223372036854775808",
      "seqno": 39064874
    }
  }'

​
Response

  • id (object) — The identifier of the block, containing:
    • workchain (integer) — The workchain ID of the block.
    • shard (string) — The shard ID of the block.
    • seqno (integer) — The sequence number of the block.
    • root_hash (string) — The root hash of the block.
    • file_hash (string) — The file hash of the block.
  • global_id (integer) — The global ID of the block.
  • version (integer) — The version of the block.
  • after_merge (boolean) — Whether the block was created after a merge.
  • before_split (boolean) — Whether the block was created before a split.
  • after_split (boolean) — Whether the block was created after a split.
  • want_merge (boolean) — Whether the block wants to merge.
  • want_split (boolean) — Whether the block wants to split.
  • validator_list_hash_short (integer) — The short hash of the validator list.
  • catchain_seqno (integer) — The sequence number in the catchain.
  • min_ref_mc_seqno (integer) — The minimum referenced masterchain sequence number.
  • is_key_block (boolean) — Whether the block is a key block.
  • prev_key_block_seqno (integer) — The sequence number of the previous key block.
  • start_lt (string) — The start logical time of the block.
  • end_lt (string) — The end logical time of the block.
  • gen_utime (integer) — The generation time of the block.
  • vert_seqno (integer) — The vertical sequence number of the block.

​
Use case

A possible use case for the getBlockHeader method in TON is for blockchain explorers, validators, or any application that needs detailed metadata about specific blocks. This method can be used to:
  1. Display comprehensive block information in a block explorer.
  2. Analyze the structure and evolution of the blockchain, including shard splits and merges.
  3. Verify the integrity and sequence of blocks in a custom validation process.
  4. Track key blocks and their relationships in the blockchain.

Query Parameters

​
workchain
integer
default:-1
required

The workchain ID

​
shard
string
default:-9223372036854775808
required

The shard ID

​
seqno
integer
default:39064874
required

The sequence number of the block

Response

200 - application/json

The header of the specified block

​
id
object
​
global_id
integer

The global ID of the block

​
version
integer

The version of the block

​
after_merge
boolean

Whether the block was created after a merge

​
before_split
boolean

Whether the block was created before a split

​
after_split
boolean

Whether the block was created after a split

​
want_merge
boolean

Whether the block wants to merge

​
want_split
boolean

Whether the block wants to split

​
validator_list_hash_short
integer

The short hash of the validator list

​
catchain_seqno
integer

The sequence number in the catchain

​
min_ref_mc_seqno
integer

The minimum referenced masterchain sequence number

​
is_key_block
boolean

Whether the block is a key block

​
prev_key_block_seqno
integer

The sequence number of the previous key block

​
start_lt
string

The start logical time of the block

​
end_lt
string

The end logical time of the block

​
gen_utime
integer

The generation time of the block

​
vert_seqno
integer

The vertical sequence number of the block

Last modified on October 19, 2025