pub fn blob_to_sha512(data: &[u8]) -> String {

    use sha2::Digest;

    format!("{:x}", sha2::Sha512::digest(data))

}

fn sha512_to_uri(sha512: &str) -> String {

    format!("urn:sha512:{}", sha512)

}

pub fn blob_to_uri(data: &[u8]) -> String {

    let sha512 = blob_to_sha512(data);

    sha512_to_uri(&sha512)

}