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Developers could use @ethda/blobs NPM package to upload Blobs to EthDA and download from it. Currently only NodeJS environment is supported.

Install​

$ npm install @ethda/blobs

Upload Blobs​

import {BlobClient, EncodeBlobs} from '@ethda/blobs';
import {ethers} from "ethers";

const content = 'abc....';
const blobs = EncodeBlobs(Buffer.from(content, 'utf-8'));

const signer = new ethers.Wallet('<private_key>', new ethers.providers.JsonRpcProvider("https://rpc.ethda.io"));
const blobClient = new BlobClient(signer);
const hash = await blobClient.sendTx(blobs)
const receipt = await blobClient.getTxReceipt(hash)

Download Blobs​

import { BlobClient, EncodeBlobs } from '@ethda/blobs';

const txHash = '...';
const blobClient = new BlobClient(new ethers.providers.JsonRpcProvider("https://rpc.ethda.io"));
const result = await blobTrans.downloadBlobs(txHash)
/**
**  result: {
 blob_hashes: ['0x01853e6b060f5b155f406a7ca3f912df5f93873d9df56ad31904db846565dbd2'],
 sidecar: { blobs: [ [Array] ], commitments: [ [Array] ], proofs: [ [Array] ] }}
 **
*/