status-im/nimbus-eth2
2
0
Fork 0
mirror of https://github.com/status-im/nimbus-eth2.git synced 2025-02-17 00:47:03 +00:00
Code Issues Projects Releases Wiki Activity

era: document block root access

Browse Source
This commit is contained in:
Jacek Sieka 2022-10-26 18:34:39 +02:00
parent 9045840c75
commit e6a346d471
No known key found for this signature in database
GPG Key ID: A1B09461ABB656B8
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
docs/e2store.md
View File

@ -336,3 +336,7 @@ The alternative that was considered is to store the state without the block appl
* no special case is needed when replaying blocks from era files - all are applied in the order they appear in the era file * no special case is needed when replaying blocks from era files - all are applied in the order they appear in the era file
In the end though, the applied block state is used throughout in the protocol - given a block, the state root in the block is computed with the data from the block applied and this later gets stored in `state_roots` which forms the basis for `historical_roots`. In API:s such as the beacon API, the canonical state root of a slot is the state with the block of that slot applied, if it is part of the canonical history given by the head. In the end though, the applied block state is used throughout in the protocol - given a block, the state root in the block is computed with the data from the block applied and this later gets stored in `state_roots` which forms the basis for `historical_roots`. In API:s such as the beacon API, the canonical state root of a slot is the state with the block of that slot applied, if it is part of the canonical history given by the head.
## How can block roots be accessed without computing them?
Each era file contains a full `BeaconState` object whose `block_roots` field corresponds to the block contents of the file. The easiest way to access the roots is to read the "header" of the `BeaconState` without reading all fields.