Blob API

Read EIP-4844 blob data from a BOT Chain node. BOT Chain stores blob sidecars on the execution layer, so it serves them through two extra eth_ methods instead of Ethereum’s Beacon API. Source: BOT Chain’s Blob API page. Both methods answered on both public RPCs on 2026-10-01.

eth_getBlobSidecarByTxHash

Returns the blob sidecar for one blob transaction.

string

required

Transaction hash, as a hex string.

boolean

default:"true"

If true, returns the full blobs. If false, returns only the first 32 bytes of each blob.

get-sidecar-by-tx.sh

curl -s https://rpc.bohr.life \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_getBlobSidecarByTxHash","params":["0x0000000000000000000000000000000000000000000000000000000000000000",false]}'

Returns null if the transaction doesn’t exist or carries no blobs.

eth_getBlobSidecars

Returns the blob sidecars for every blob transaction in a block.

string

required

Block number as hex, block hash, or one of the tags earliest, latest, safe or finalized.

boolean

default:"true"

If true, returns the full blobs. If false, returns only the first 32 bytes of each blob.

get-sidecars.sh

curl -s https://rpc.bohr.life \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_getBlobSidecars","params":["latest",false]}'

Returns an empty array if the block has no blob transactions. Returns null for a block that doesn’t exist yet.

Response shape

BOT Chain’s docs don’t describe the response fields. We sent a blob transaction on testnet on 2026-10-02 and captured this response from eth_getBlobSidecarByTxHash with full_blob_flag set to false:

response.json

{
  "blobSidecar": {
    "blobs": ["0x0000000000000000140000000000000000000000000000000000000000000000"],
    "commitments": ["0x9732e36cf9d17dffd555150cc0023412166076f6591b3143debcf8a8bbbdcdbd385ca69471402fd0b81c78e86c658b18"],
    "proofs": ["0x8b8bc807b9fd67ed0d40e7b6b55982a83e519a7b51efe208e1e747730daf063103b42cffe13248871baf40ac9be3467b"]
  },
  "blockHash": "0x3ca8c9953eb68bac23eff75ec0263abc739f3d6c796b6173830b8effbcab1ab3",
  "blockNumber": "0x18383ca",
  "txHash": "0x2fdbde3757d070add8cd74be3b7f9d7a2f2d7fc056be4d635d4c315b764de5df",
  "txIndex": "0x0"
}

eth_getBlobSidecars returns an array of these objects, one per blob transaction in the block.

string[]

One entry per blob. Each full blob is 131,072 bytes. With full_blob_flag set to false, you get only the first 32 bytes.

string[]

The KZG commitment for each blob, 48 bytes each.

string[]

The KZG proof for each blob, 48 bytes each.

string

Hash of the block that includes the transaction.

string

Block number, as hex.

string

Hash of the blob transaction.

string

Position of the transaction in the block, as hex.

Send a blob transaction

BOT Chain accepts blobs in the original EIP-4844 format, with one proof per blob. It does not accept the newer EIP-7594 (PeerDAS) format, which recent Foundry versions use by default. With Foundry, add --eip4844:

send-blob.sh

echo "hello from BOT Chain" > blob.txt
cast send YOUR_ADDRESS --blob --eip4844 --path blob.txt --rpc-url https://rpc.bohr.life --account uzo-dev

Without --eip4844, the node rejects the transaction with rlp: expected input list for []kzg4844.Blob. Our test transaction used 131,072 blob gas at a blob gas price of 1 wei.

Blob fees

Blob gas has its own fee market. Read the current blob base fee with eth_blobBaseFee. It was 1 wei on both networks on 2026-10-01.

blob-base-fee.sh

cast rpc eth_blobBaseFee --rpc-url https://rpc.bohr.life

Supported EIPs

EIP-4844 and other upgrades.

Differences from Geth

Why blobs live on the execution layer.

Network

APIs

Help

Project

eth_getBlobSidecarByTxHash

eth_getBlobSidecars

Response shape

Send a blob transaction

Blob fees

Supported EIPs

Differences from Geth

​eth_getBlobSidecarByTxHash

​eth_getBlobSidecars

​Response shape

​Send a blob transaction

​Blob fees

​Related pages

Supported EIPs

Differences from Geth

eth_getBlobSidecarByTxHash

eth_getBlobSidecars

Response shape

Send a blob transaction

Blob fees

Related pages