# Standard Block Chain Engineering Service

The Standard Block Chain Engineering service is an original implementation of various objects dedicated to the management of a block chain. At the bottom of the hierarchy is the the part which is assembled in a bill of parts (BOP). The bill is associated with a transaction which is time-stamped and signed. The transactions are linked together to form a chain.

## General concepts

The `afnix-bce` provides the support for manipulating block-chain.

## Part

The concept of part is central in the bce service. A part is any serializable object which is used to assemble a bill of parts (BOP).