Where can I find a description (preferably a diagram like below) showing the block structure in an Ethereum blockchain?
Credits: Wikipedia
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1Correct me if I am wrong but this is not only relevant to Proof of Work, the Proof of stake will still use the same Merkle Tree right?– CyberienceJun 27, 2018 at 7:03
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7 Answers
Here's my interpretation, based on the yellow paper:
...the Tries should look more like this:
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6Hi @atomh33ls, do you mind sharing the source file for the illustrations (in whatever software format you used to create them). I would like to create an illustration for transactions trie. It will look almost the same as state trie except some details will be changed. Thank you! Oct 26, 2017 at 10:29
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@atomh33ls I would also be interested in the source files. I really like this amazing overview! What software did you use?– kn1gJun 8, 2019 at 17:13
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1@atomh33ls +1 to the source file, please. If not, I'd also be happy recreating it in mermaid.js so the community could co-edit it. The three specific changes I have in mind are adding a note that the key size is shortened for simplified purposes, putting the tree complexity (max depth) in the bottom right, and adding and example of an extension node with prefix 1[]. Apr 23, 2022 at 0:35
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Lets first start with my adaptation of this figure illustrating the Bitcoin block structure:
So far so good. All fairly basic.
Enter Ethereum and things get a wee bit more complex. After reading through this and this, and as per @eth 's recommendation this, my best interpretation is the figure below:
The header field definitions are available in section 4.3 of the yellow paper.
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2Uncles is a hash (of a list of uncles), Yellow Paper has: "The Keccak 256-bit hash of the ommers list portion of this block". Codehash is just a hash since contracts are immutable. The pointers point to "hash of whole block header" (the Keccak-256 hash of all the bytes in the block header). To have a full diagram, should really consult the Yellow Paper...– eth ♦Jan 29, 2016 at 22:53
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Updated response after consulting the YP. Starting to get clearer now. Thanks!– zanzuFeb 1, 2016 at 12:34
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3These links correspond to contract state that has not changed in between blocks. Referencing the state from the previous blocks instead of replicating is more efficient from a block size perspective.– zanzuJun 10, 2016 at 9:49
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Here is a complete structure of a block and where it plays its role in Ethereum's blockchain.
You asked for a diagram but i think this would be more explanatory.
The description can be found in the Yellow Paper which is the formal specification of the Ethereum protocol.
Here are the main pieces of a block:
4.3. The Block. The block in Ethereum is the collection of relevant pieces of information (known as the block header), H, together with information corresponding to the comprised transactions, T, and a set of other block headers U that are known to have a parent equal to the present block’s parent’s parent.
No diagram though (an opportunity for the community).
Here's a picture from V's article regarding data structures for light clients:
https://blog.ethereum.org/2014/02/18/ethereum-scalability-and-decentralization-updates/
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4The above is an abstraction of a Merkle tree. I'm rather looking for the Ethereum block structure (including all the actual header fields).– zanzuJan 22, 2016 at 8:57
Vitalik Buterin gives a compact answer:
Every block header in Ethereum contains 3 trees for three kinds of objects: Transactions, Receipts (essentially, pieces of data showing the effect of each transaction), State.
You can read a longer version with pictures here.
Extrapolating from the syntactic block structure, we can also ask what the semantic ethereum world state structure looks like. I use this diagram to explain the relationship between "on-chain", "off-chain", and everything in between, including L2 scaling solutions. Please see my accompanying blog post for more details.
