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1. Private Data in
Hyperledger
Fabric

2. Private Data in
Hyperledger Fabric
Two ways to keep data private between
organizations in Hyperledger Fabric:
• by creating a channel between
organizations;
• by using private data collections.

3. What is a channel?
A channel is a private “subnet” of
communication between two or more
authenticated and authorized network
members. All transactions in a Hyperledger
Fabric network run in a channel.

4. What is a private data
collection?
A private data collection consists of two
elements:
1. Actual private data — data sent from
one organization's peer to another
organization's peer.

5. What is a private data
collection?
The data is stored in a private database on
the peers of authorized organizations.
The private data is not stored on the ledgers
of the channel peers.

6. What is a private data
collection?
A private data collection consists of two
elements:
2. Hash of the private data — a hash of
the private data that is stored on ledgers of
the channel peers.

7. What is a private data
collection?
Diagram illustrating the ledger contents of a peer authorized to
have private data and one which is not.

8. When to use a channel?
Channels are the default way of
communication for organizations in a
Hyperledger Fabric.
Default communication within a channel is
accessible by all peers of organizations that
are a part of the channel.

9. When to use private data
collections?
Private data collections are used to keep
parts of data private within one channel
without creating a separate channel for
communication.

10. Can private data collections
be shared?
Private data collections can be shared with
other channel members that are not a part
of the original private data collections. This
is done via chaincodes.

11. Can private data collections
be purged?
Organizations can purge private data
collections when necessary or even set up
automatic purging.
When purged, private data will not
available, but will leave the hash data on
the channel ledgers as an immutable trace
that the private data existed.

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