SingularGarden - How to implement a Blockchain - Append

blockchain_append.py

# https://github.com/singulargarden/ouroboros/blob/v0.1/ouroboros/blockchain/__init__.py

def prepare_block(root_path, payload):
    # Load the current blockchain state
    current_descr = load_descr(root_path)

    # Create the new block attached to the current head of the chain
    current_block_hash = current_descr.head_hash
    new_block = make_block(current_block_hash, payload)

    # Prepare the new blockchain state
    new_descr = update_descr_with_new_head(current_descr, new_block.hash)

    return new_descr, new_block

def append(root_path, payload):
    """
    Append a new block to our chain using the given payload.
    Returns the block to share with others participants.
    """
    new_descr, block = prepare_block(root_path, payload)
    store_new_block(root_path, new_descr, block) # just write down to disk
    return block.hash