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37 lines
1.8 KiB
ReStructuredText
37 lines
1.8 KiB
ReStructuredText
The Block Model
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===============
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A block has the following structure:
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.. code-block:: json
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{
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"id": "<hash of block>",
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"block": {
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"timestamp": "<block-creation timestamp>",
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"transactions": ["<list of transactions>"],
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"node_pubkey": "<public key of the node creating the block>",
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"voters": ["<list of federation nodes public keys>"]
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},
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"signature": "<signature of block>"
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}
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- ``id``: The :ref:`hash <Hashes>` of the serialized inner ``block`` (i.e. the ``timestamp``, ``transactions``, ``node_pubkey``, and ``voters``). It's used as a unique index in the database backend (e.g. RethinkDB or MongoDB).
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- ``block``:
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- ``timestamp``: The Unix time when the block was created. It's provided by the node that created the block.
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- ``transactions``: A list of the transactions included in the block.
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- ``node_pubkey``: The public key of the node that created the block.
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- ``voters``: A list of the public keys of federation nodes at the time the block was created.
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It's the list of federation nodes which can cast a vote on this block.
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This list can change from block to block, as nodes join and leave the federation.
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- ``signature``: :ref:`Cryptographic signature <Signature Algorithm and Keys>` of the block by the node that created the block (i.e. the node with public key ``node_pubkey``). To generate the signature, the node signs the serialized inner ``block`` (the same thing that was hashed to determine the ``id``) using the private key corresponding to ``node_pubkey``.
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Working with Blocks
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-------------------
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There's a **Block** class for creating and working with Block objects; look in `/bigchaindb/models.py <https://github.com/bigchaindb/bigchaindb/blob/master/bigchaindb/models.py>`_. (The link is to the latest version on the master branch on GitHub.)
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