Questions tagged [consensus]
Generic tag for consensus-related questions, e.g. block production protocols, finality protocols, parachains. Best used in combination with other more specific tags (e.g. [tag:grandpa] or [tag:babe]).
64
questions
7
votes
1
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91
views
Session changes on reversion
When reasoning about a particular problem, I realized that I don't know how session changes work with chain reversions. To my knowledge session changes are based on time/slots and not on blocks. So ...
- 190
4
votes
0
answers
22
views
How to achieve instant finality with substrate?
Ideally, I would like to build a chain with Substrate but using Tendermint as the consensus engine.
The problem is that it's a lot of work to implement it correctly.
But what if I use AURA (round ...
1
vote
0
answers
28
views
Switching from `Aura` to `Babe` consensus causes error "Incomplete block import pipeline" on genesis block
I am trying to switch from Aura to Babe consensus. After successful building and node start I am getting an error "Block import error: Incomplete block import pipeline.". This happens with ...
3
votes
1
answer
28
views
Consensus algorithm selection
We are looking to build private blockchain on Substrate. It should be scalable up to 300 validators. Like start with 3 and scale it to 300 later on. Does standard AURA suitable for this? Can AURA ...
- 53
1
vote
0
answers
28
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Is block creation guaranteed to be running after parent block is fully imported?
I observe an issue for a long time that I can't explain.
There is a value produced in BlockImport::import_block that must be included in inherents of n+1.
Though sometimes it seems like value is not ...
- 429
2
votes
3
answers
40
views
why blocks could contain failed transaction
After building and running substrate-node-template i started the local node with --dev flag :
./target/release/node-template --dev
i opened https://polkadot.js.org/apps/#/extrinsics and selected the ...
- 691
4
votes
0
answers
33
views
Adhering to size limit of a block
We do track weight during block creation/block import, but weight only cares about execution time and with 2D weights also about storage proof size.
We do keep track of size in propose here but only ...
- 190
2
votes
1
answer
90
views
What happens on invalid blocks?
I was wondering about block import in particular about invalid blocks: What are the consequences of a block being deemed invalid/failing block import - except well for the block not being imported. Is ...
- 190
2
votes
1
answer
44
views
Is there any constrain forced on Parachains for block authoring logic?
I am reading Cumulus PDK and Parachain documentations, and looking forward to converting our project to a parachain and join the Polkadot ecosystem.
However, I am confused regarding the parachain ...
- 135
0
votes
1
answer
25
views
Lightweight consensus implementation for Substrate in production?
What is the most relaxed and fastest consensus implementations for Substrate? I am considering to use something much faster and lightweight for processing of social messaging on Subsocial's L2 ...
- 305
2
votes
1
answer
27
views
Do we need to implement the `Verifier` trait if we are providing our own implementation of `ImportQueue`?
Let's say I have a consensus engine called X. I know that most consensus engines import blocks through something with the trait ImportQueue, and BasicQueue is a popular choice for that. Consensus ...
- 2,802
4
votes
1
answer
34
views
BABE: VRF verification fails
We just ran into the following issue on our kintsugi testnet deployment:
[Relaychain] :broken_heart: Verification failed for block 0xdef612b6bd9d3b6a2ff93a1e9310f385b7a8b715f3f368135731772a3c6f0792 ...
- 375
0
votes
1
answer
66
views
How and where does a block production take place?
Like if I were to add some custom logic and checks to ensure only certain kind of blocks are produced by the validators or only those blocks that contain a certain size of data are produced then where ...
1
vote
0
answers
32
views
PoW custom consensus with remote calls
I'm trying to implement a new consensus in Substrate.
The consensus is similar to PoW but requires querying other nodes to generate the work/proof. Would implementing the PowAlgorithm trait and ...
- 11
0
votes
1
answer
15
views
Node template based network runs with multiple peers using the same identity
I noticed some interesting behavior while running a local test net on my machine. I booted up a network between the default Alice and Bob accounts that are used in all the tutorials, and they ...
- 101
0
votes
0
answers
10
views
develop consensus before packing
I need to develop consensus before packing, but I couldn't find anything on the subject online. Could someone kindly explain it to me and, if possible, show me how to do it in substrate?
The goal is ...
4
votes
1
answer
101
views
Have we broken warp sync?
We are trying to use warp sync for our substrate chain but it doesn't seem to advance past the genesis block.
Normal sync works fine. We purge the chain state and then run the node using:
chainflip-...
- 410
0
votes
1
answer
80
views
How to implement a POC for a new consensus algorithm in substrate?
I am currently working on a substrate project that uses the PoA consensus algorithm. I would like to implement a POC for a new consensus algorithm. I have some experience with substrate but I'm new to ...
- 491
1
vote
1
answer
35
views
Debugging parasDisputes
We noticed on Jan 19 that kintsugi (our kusama para) did not finalize blocks for about 60 minutes. It seems the cause is likely rooted in disputes being raised. In turn, a lot of dispute events fired ...
- 375
0
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0
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29
views
how can change consensus algorithm in substrate [duplicate]
consensusi wanna to know how can change consensus algorithm in substrate ?
i gonna to change consensus to DPOS or NPOS or POS , in this step i want to know how can i change consusnse of substrate .
...
- 491
0
votes
1
answer
100
views
change consensus of substrate
i wanna to change my substrate chain consensus but i dont know how can i do and set my new consensus in substrate .
i want to set dops consensus for my substrate chain also please guide my for ...
1
vote
1
answer
39
views
Maximum duration between candidate backing and inclusion
For our BEEFY-powered bridge, we need to determine the relay chain block in which a finalized parachain header was included. It seems this happens roughly 2-3 blocks after the relay chain block which ...
- 158
1
vote
1
answer
63
views
does the block gets signed by all authorities in aura?
i have read their official documentation and im not sure i completely understand the process of block creation or finalization.
i know that after each period of time, there is a block author that ...
- 691
2
votes
2
answers
154
views
Is this canonicalization issue a problem and if so, has anyone solved it? - "Could not canonicalize elem at pos x using key"
We are getting the below canonicalization issue and we are wondering:
Is it a problem or is it normal and can be ignored?
Has anyone found a method to resolve it?
Here's what we know:
It ...
- 153
1
vote
1
answer
124
views
how to get the current block author?
I am creating a new pallet, i have a simple task, get the current block author, i want to check whether I am the current one that is proposing the block or not by comparing the current block author ...
- 691
0
votes
0
answers
42
views
Where to learn more about custom consensus implementation?
Any tips, links and examples to go deep with custom consensus implementation?
I like to create a very light consensus where the majority of the node are well known nodes and I want to implement checks ...
- 87
3
votes
1
answer
169
views
<wasm:stripped> printed when logging from the runtime
I'm trying to debug in pallet-staking to figure out something about how validators/nominators join NPoS network.
https://github.com/paritytech/substrate/blob/master/frame/staking/src/pallet/impls.rs#...
- 496
1
vote
0
answers
31
views
How do pallet and consensus model/algorithm/infrastructure work together?
Hi guys I am new to blockchain and susbtrate, so these questions would be stupid to you...But I really need some help here...
How does substrate ensure anything has been done inside the pallet will ...
- 11
1
vote
0
answers
24
views
Produce blocks only if there are incoming transactions
Is there a way to produce blocks only if there are incoming transactions. Thus not producing empty blocks?
Do we need to build a palette for that or what exactly?
- 131
0
votes
1
answer
119
views
NPoS with Aura - no planned era
UPDATE: The election always finalizes with Election Fallback and set of validators doesnt't and neither does the Era, but sessions keep increasing.
I understand that an era is just a couple of ...
1
vote
2
answers
112
views
Is it possible to integrate node-authorization pallet after genesis?
In the Permissioned Network tutorial on Substrate docs, it's shown how to created a permissioned network from scratch along with the node-authorization pallet to manage the validator set.
However, in ...
- 185
1
vote
0
answers
37
views
Failed to resolve dependencies with pallet-staking in frontier
i am trying to implement n-POS in my frontier and i had to use pallet-staking for that. but when i try to use this dependency in my cargo.TOML file it start giving me error related to frame-...
1
vote
0
answers
27
views
Integrate nimbus in runtime node
How to integrate nimbus in place of aura authorship in our node runtime ?
- 1,016
1
vote
1
answer
53
views
Failed Extrinsic "CannotLookup" - Invalid Account ID?
I'm building a Golang client that interfaces with Polkadot and I want to better understand lookup errors.
In Polkadot block 10572717 the extrinsic at index 2 (subscan link 10572712-2) has failed with ...
- 197
0
votes
1
answer
44
views
PoW Rewards for Mining
In this Substrate Recipe it says nothing about the rewards miners get for including blocks into the chain in the PoW consensus.
But I found that Kulupu uses a rewards pallet which, at first glance, ...
- 434
1
vote
1
answer
61
views
How can I increase the validators with polkadot-local
I tried the extrinsic.staking. increaseValidatorCount & setValidatorCount
and sign with one of the builtin dev accounts but nothing happens.
How long should it take! one epoch or an era?
What is ...
- 445
2
votes
1
answer
120
views
How many collators need to be set on the parachain?
Background
our parachain has won the slot and will launch in the future. So, we firstly face the question of how many collators should be setup in our parachain. Here are some of my questions:
...
- 313
5
votes
1
answer
45
views
What is the current state of Swappable Consensus and Re-Genesis
I've found these two open issues:
Re-Genesis #7458
Swappable Consensus #1304
and would be interested if there is more practical guidance on an example basis?
- 51
1
vote
1
answer
35
views
On using Instantseal on a public standalone network
What are the ramifications of using InstantSeal on a public standalone chain? According to the comments on How to reject empty blocks?, it's quite evident that babe/aura based chains require blocks to ...
- 2,802
4
votes
1
answer
362
views
Is it possible to resurrect babe chains?
I've learned that babe chains, when all validators go offline, stalls and isn't recoverable. But my question is, from a database perspective we have the data in the chainstate folders right? So wouldn'...
- 2,802
1
vote
1
answer
73
views
Get last finalized block information from a pallet
Is it possible to retrieve the latest finalized block from a non-finalized block and its information? Using the Polkadot JS App we can check the chain state using the hash of the block, and using the ...
- 1,044
1
vote
1
answer
62
views
Verify storage entry with getReadProof
I'm currently trying to prove a storage entry by verifying the output of getReadProof but am not really sure how to do this.
For some context: I want to query a parachains header from the relay chains ...
4
votes
1
answer
58
views
Polkadot consensus and Honey Badger BFT
I want to know the relationship between Polkadot consensus and Honey Badger BFT (HBBFT). Is Polkadot's consensus using HBBFT?
- 313
3
votes
1
answer
75
views
What happens if validator count < minimum_validator_count?
I am using the staking pallet and it has an item known as minimum_validator_count. I'd like to learn what would happen if the actual validators in the network is less than this entity. Would the ...
- 2,802
2
votes
1
answer
50
views
Is there a substrate node that contains pallet-contracts and uses instant seal consensus?
I've seen instant seal mentioned as a way to get transactions sealed by the substrate node upon receipt.
I also know that moonbeam have this in their node.
Is there a substrate node that includes ...
- 1,192
2
votes
1
answer
122
views
How to reject empty blocks? [duplicate]
I need to prevent empty blocks from being added to my blockchain.
This is for a very small scale chain, in which 99.99884% of blocks are empty, so not adding empty blocks will dramatically reduce the ...
- 96
4
votes
1
answer
55
views
In substrate, does the genesis block get finalised the same way as the subsequent blocks?
In substrate, does the genesis block get finalised the same way as the subsequent blocks, or is finalisation of the genesis block a special case?
4
votes
1
answer
52
views
Substrate chain reconcilliation with BABE/GRANDPA
With BABE, I understand validators to produce blocks and chosen randomly and multiple validators may be eligible to produce a block, already providing a large amount of forks/fork opportunities. If no ...
- 105
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votes
1
answer
71
views
How to properly split logic between block verifier and block import?
I found it a bit confusing that part of the logic for block verification is in sc_consensus::import_queue::Verifier::verify() implementation and another part is in sc_consensus::block_import::...
- 429
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votes
2
answers
70
views
What are the various consensus mechanism and how are they best leveraged [closed]
Just looking for a further rationale around each consensus mechanism and what they aim to solve.
- 445