September 2019
Beginner to intermediate
540 pages
13h 3m
English
Content preview from Learn Ethereum
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Whisper envelopes
Whisper envelopes contain the encrypted payload and some metadata in plain format. It is sent and received by Whisper nodes.
Here is the structure of the envelope. It contains topic-related information, as shown in the following diagram:
Each field in the Whisper envelope contains important information for the message:
- Version: This can be up to 4 bytes (currently one byte containing zero) and indicates the encryption method. If the Version is higher than the current one, the envelope cannot be decrypted, and therefore can only be forwarded to the peers.
- Expiry: This is the message expiry time (Unix time in seconds).
- TTL ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.