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Clarified the crypto-condition example in assets.md

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BigchainDB can store data of any kind (within reason), but it's designed to be particularly good for storing asset registrations and transfers:
* The fundamental thing that one submits to a BigchainDB federation to be checked and stored (if valid) is a _transaction_, and there are two kinds: creation transactions and transfer transactions
* A creation transaction can be use to register any kind of indivisible asset, along with arbitrary metadata
* An asset can have zero, one, or several owners
* The owners of an asset can specify (crypto-)conditions which must be satisified by anyone wishing transfer the asset to new owners (typically at least m signatures from the n current owners)
* The fundamental thing that one submits to a BigchainDB federation to be checked and stored (if valid) is a _transaction_, and there are two kinds: creation transactions and transfer transactions.
* A creation transaction can be use to register any kind of indivisible asset, along with arbitrary metadata.
* An asset can have zero, one, or several owners.
* The owners of an asset can specify (crypto-)conditions which must be satisified by anyone wishing transfer the asset to new owners. For example, a condition might be that at least 3 of the 5 current owners must cryptographically sign a transfer transaction.
* BigchainDB verifies that the conditions have been satisified as part of checking the validity of transfer transactions. (Moreover, anyone can check that they were satisfied.)
* BigchainDB prevents double-spending of an asset
* Validated transactions are strongly tamper-resistant; see [the section about immutability / tamper-resistance](immutable.html)
* BigchainDB prevents double-spending of an asset.
* Validated transactions are strongly tamper-resistant; see [the section about immutability / tamper-resistance](immutable.html).
You can read more about the details of BigchainDB transactions in [the section on Transaction, Block and Vote Models (data models)](models.html).