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When I perform a transaction on the blockchain, I can add a message to the transaction, which will then exist forever in the blockchain.
Say for example I wanted to use the blockchain to store digital assets...
Could this type of information be encrypted and stored as a transaction message, and if so, is there any limit to the message length of a transaction?
This message exists only on blockchain.info site. It is not a part of bitcoin protocol. You should not think, that it will exists forever, because blockchain.info is third-party-service
Point your view to a OP_RETURN output scripts. http://bitzuma.com/posts/op-return-and-the-future-of-bitcoin/
