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Because LogNote is an anonymous event it is cheaper but on the other side you cannot filter it using a topic. See this already answered question for more details. Anyway, you can listen to all contract events and then filter in Javascript. DAI in fact has only 3 types of event: Transfer and Approval - with 3 parameters - and LogNote - with 4 parameters. ...


Plese note that syncing optimization is up to clients, not to Ethereum, so each client implements its very own optimization method. When you say fast sync, I think you refer to geth. Fast sync is now the default sync mode for geth, and it is a way to prioritize objects you want to sync so you can start to work with the chain sooner. In particular, in geth's ...


Fast sync nodes do have all TX receipts, hence all logs.

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