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How does IP2IP work?

I heard a lot of discussions mentioning IP2IP at the recent CoinGeek conference in Seoul. I really like the idea of users exchanging transactions peer-to-peer, but I am wondering how IP2IP works on a technical level?

Does it require a daemon/service running on the recipient’s computer that listens for incoming transactions or is there some other approach?

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A easy answer. If time is an illusion what is the past what is the future

I’m trying to understand time how come is time an illusion. Yes I understand that it’s man-made how come some people are talking about traveling back in time or in the future of time and some people are saying it’s irrelevant it’s all one thing.the question is how can you put this one thing into a simple word or a simple sentence

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Which transactions are available from "getrawtransaction" RPC call when "-txindex" is disabled?

I noticed that even with -txindex disabled getrawtransaction RPC call still returns transactions. I assume that without the full index it will still return transactions that node software needs for other reasons (wallet transactions, UTXOs, …). But what are those cases? Which types of transactions are available even without the full transaction index? And what happens if I request a transaction that is not available?

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