Does this mean the transaction had to come from a Blockchain.info/wallet user (or perhaps someone using Blockchain.info/pushtx)? Or could this indicate something else (e.g., a node from Tor even)?


Yes, It means blockchain.info broadcast the transaction itself. So it was either created using My Wallet, the merchant API or submitted through /pushtx. A live list can be seen here http://blockchain.info/ip-address/

Mixer transactions are broadcast through separate nodes.

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