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/eth/v1/beacon/headers/{block_id} REST API Endpoint

Retrieves block header for given block id.

Updated on
Mar 24, 2026

Path Parameters

block_id
string
REQUIRED

Block identifier. Can be one of: head (canonical head in node's view), genesis, finalized, justified, <slot>, <hex encoded blockRoot with 0x prefix>

Returns

execution_optimistic
boolean

Indicates whether the execution is optimistic

finalized
boolean

Indicates whether the response is finalized

data
object

The block data object

root
string

The block root hash

canonical
boolean

Indicates whether the block is canonical

header
object

The block header object containing message and signature

message
object

The message object

slot
string

The slot position in numerical value

proposer_index
string

The proposer index in numerical value

parent_root
string

The parent root hash

state_root
string

The state root hash

body_root
string

The body root hash

signature
string

The signature of the message object

Request
Response
1
{
2
"execution_optimistic": false,
3
"finalized": true,
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"data": {
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"root": "0x64b4fd8e25079f945c53e1eed8148af57d934c8eafa35dc86920bb4c4dc0d6eb",
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"canonical": true,
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"header": {
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"message": {
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"slot": "18454433",
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"proposer_index": "48",
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"parent_root": "0xd038d0071bcd647f0164dfb3469c9157f9e735690d4891538fd8184bf802a000",
12
"state_root": "0x1e497b0e6ec8d98af0cd68f6db144e5bca01a2e615ed1a7514d020095be7f8a0",
13
"body_root": "0x64b4fd8e25079f945c53e1eed8148af57d934c8eafa35dc86920bb4c4dc0d6eb"
14
},
15
"signature": ""
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}
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}
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}
1
{
2
"execution_optimistic": false,
3
"finalized": true,
4
"data": {
5
"root": "0x64b4fd8e25079f945c53e1eed8148af57d934c8eafa35dc86920bb4c4dc0d6eb",
6
"canonical": true,
7
"header": {
8
"message": {
9
"slot": "18454433",
10
"proposer_index": "48",
11
"parent_root": "0xd038d0071bcd647f0164dfb3469c9157f9e735690d4891538fd8184bf802a000",
12
"state_root": "0x1e497b0e6ec8d98af0cd68f6db144e5bca01a2e615ed1a7514d020095be7f8a0",
13
"body_root": "0x64b4fd8e25079f945c53e1eed8148af57d934c8eafa35dc86920bb4c4dc0d6eb"
14
},
15
"signature": ""
16
}
17
}
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}
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