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* Problem: Source files contain no license info Solution: Add comments with SPDX license info to source files * Python 3 files don't need # -*- coding: utf-8 -*-
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.. Copyright BigchainDB GmbH and BigchainDB contributors
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SPDX-License-Identifier: (Apache-2.0 AND CC-BY-4.0)
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Code is Apache-2.0 and docs are CC-BY-4.0
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BigchainDB and Smart Contracts
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==============================
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One can store the source code of any smart contract (i.e. a computer program) in BigchainDB, but BigchainDB won't run arbitrary smart contracts.
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BigchainDB will run the subset of smart contracts expressible using `Crypto-Conditions <https://tools.ietf.org/html/draft-thomas-crypto-conditions-03>`_.
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The owners of an asset can impose conditions on it that must be met for the asset to be transferred to new owners. Examples of possible conditions (crypto-conditions) include:
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- The current owner must sign the transfer transaction (one which transfers ownership to new owners).
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- Three out of five current owners must sign the transfer transaction.
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- (Shannon and Kelly) or Morgan must sign the transfer transaction.
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Crypto-conditions can be quite complex. They can't include loops or recursion and therefore will always run/check in finite time.
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.. note::
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We used the word "owners" somewhat loosely above. A more accurate word might be fulfillers, signers, controllers, or transfer-enablers. See the section titled **A Note about Owners** in the relevant `BigchainDB Transactions Spec <https://github.com/bigchaindb/BEPs/tree/master/tx-specs/>`_. |