public String getBlob() {
    return blob;
  }
The result of the eth_getBlobAndProofV1 JSON-RPC method contains an array of BlobAndProofV1.
BlobAndProofV1 contains the blob data and the kzg proof for the blob.
ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/results/BlobAndProofV1.java