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When sending a transaction using a wallet at blockchain.info you can add a public message. This message shows up when viewing the transaction at blockchain.info.
Is this message embedded in the actual block chain or is it just a record in the database of the server of blockchain.info?
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It did for a few days, before the blockchain.info operator concluded blockchain bloat was not good for Bitcoin. Now those are only stored on Blockchain.info hosts.
For more details, see:
1blockchain.info has removed this feature. there is no more public message notes. – Patoshi パトシ – 2017-03-23T23:15:24.887
Just recorded in the database. – Nick ODell – 2013-02-22T20:44:47.370