---
tags: eip4844,lighthouse,dencun
---

# Dencun devnet-8 Testing

## Devnet-8 Links

Request some devnet eth from one of the faucets here:
https://dencun-devnet-8.ethpandaops.io/

## Run a node on Devnet v8 (Lighthouse/Geth)

git clone https://github.com/jimmygchen/eip4844-devnet.git
cd eip4844-devnet
docker-compose up -d --build

## Sending Blobs

### Nethermind's `SendBlobs`

Nethermind's `SendBlobs` tool can be found [here](https://github.com/NethermindEth/nethermind/tree/feature/send-blobs-tool/src/Nethermind/Nethermind.SendBlobs).

### Blob-utils

git clone https://github.com/Inphi/blob-utils.git
cd blob-utils
go build

# for Mac with Apple M1/M2 chips, build with these flags:
CGO_CFLAGS="-O -D__BLST_PORTABLE__" CGO_CFLAGS_ALLOW="-O -D__BLST_PORTABLE__" go build

#### Sending a blob

Replace `your_private_key` with your private key.

./blob-utils tx --rpc-url http://localhost:8545 \
    --blob-file <(echo hello) \
    --to 0xC8D369B164361A8961286CFbaB3bc10F962185a8 \
    --private-key <your_private_key> \
    --gas-limit 210000 \
    --chain-id 7011893058 \
    --priority-gas-price 200000000 \
    --max-fee-per-blob-gas 300000000

## Downloading a blob via Beacon API

# look up by slot
curl http://localhost:5052/eth/v1/beacon/blob_sidecars/68267 | jq .