mirror of
https://github.com/corda/corda.git
synced 2024-12-19 13:08:04 +00:00
37 lines
1.3 KiB
ReStructuredText
37 lines
1.3 KiB
ReStructuredText
The ledger
|
|
==========
|
|
|
|
.. topic:: Summary
|
|
|
|
* *The ledger is subjective from each peer's perspective*
|
|
* *Two peers are always guaranteed to see the exact same version of any on-ledger facts they share*
|
|
|
|
Video
|
|
-----
|
|
.. raw:: html
|
|
|
|
<iframe src="https://player.vimeo.com/video/213812040" width="640" height="360" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
|
|
<p></p>
|
|
|
|
Overview
|
|
--------
|
|
In Corda, there is **no single central store of data**. Instead, each node maintains a separate database of known
|
|
facts. As a result, each peer only sees a subset of facts on the ledger, and no peer is aware of the ledger in its
|
|
entirety.
|
|
|
|
For example, imagine a network with five nodes, where each coloured circle represents a shared fact:
|
|
|
|
.. image:: resources/ledger-venn.png
|
|
:scale: 25%
|
|
:align: center
|
|
|
|
We can see that although Carl, Demi and Ed are aware of shared fact 3, **Alice and Bob are not**.
|
|
|
|
Equally importantly, Corda guarantees that whenever one of these facts is shared by multiple nodes on the network, it evolves
|
|
in lockstep in the database of every node that is aware of it:
|
|
|
|
.. image:: resources/ledger-table.png
|
|
:scale: 25%
|
|
:align: center
|
|
|
|
For example, Alice and Bob will both see the **exact same version** of shared facts 1 and 7. |