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For questions regarding the Stellar Consensus Protocol (SCP).

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23 views

How stellar can ensure a network doesn't has disjoint quorums?

Does stellar maintain set of nodes to achieve quorum intersection ? If not how a stellar network can achieve quorum intersection all the time , meaning no disjoint quorums at all in the network?
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1answer
25 views

How a new node trusts another node in the network

Let's assume that a new node joined in the network.As per the SCP how this new node trusts another node in the network? Does this happens by exchanging messages between other nodes in the network ? ...
4
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1answer
22 views

SCP. Does non-intersecting quorums have different ledgers?

As I understand "slot" = ledger number, "value" = set of transaction. So сould you explain what happens when I(simple node with quorum slice) create a transaction ? 1) Do all nodes in stellar-...
4
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1answer
35 views

How does a node discover the quorums that it is in?

In order for a node to determine that a ledger has been confirmed, it needs to know that a proportion of other nodes in one of its quorum has accepted the ledger. In order to determine which nodes ...
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2answers
16 views

(SCP) When does a node get its higher-layer software's input?

According to the SCP document (draft-mazieres-dinrg-scp-04, https://datatracker.ietf.org/doc/draft-mazieres-dinrg-scp/), the following paragraph describes how a node get its higher-layer software's ...
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2answers
65 views

Is there a minimal implementation of Stellar Consensus Protocol besides stellar-core?

I'm learning about consensus and I'd like to explore SCP in depth. However, the stellar-core implementation is difficult for a newcomer to grok. Is there a minimal SCP implementation elsewhere I can ...
4
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1answer
55 views

Why does the high level threshold level for quorum have to be above 66%?

What is reason that the threshold of consensus bearing nodes must be above 66% for the network to operate successfully? This is straight from the docs of the stellar-core_example.cfg file. ...
2
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2answers
57 views

What is asymptotic security and why does Stellar, but not POW exhibit this?

One of the benefits mentioned of SCP in comparison to POW is 'asymptotic security' https://www.stellar.org/blog/stellar-consensus-protocol-proof-code/. What does this form of security mean in practice ...
4
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1answer
61 views

Questions about SCP and federated voting steps, with a focus on the Internet-Draft

I recently have studied the Stellar Consensus Protocol (SCP) based on the internet draft here: https://datatracker.ietf.org/doc/draft-mazieres-dinrg-scp/. I have several questions as follows. In the ...
2
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2answers
190 views

What does it mean with “surge pricing in effect” at Stellar-Core?

As I tested my private network by flooding transaction (around 60TPS) via Horizon using JS-sdk, SCP errored. The only abnormalty that I observed was: [Herder WARNING] surge pricing in effect! 142 ...
2
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1answer
84 views

How can I query or visualize the quorum slices of the Stellar network?

I think I remember faintly that a while ago there was a JS-based visualization of the quorums between various validators on Stellar but I seem unable to find it again. As far as I understand the ...
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1answer
50 views

Consensus about a transaction set

In the description of the transaction life cycle it is mentioned that: SCP resolves the differences between the various transaction sets proposed and decides on the one transaction set that the ...
1
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1answer
36 views

How are timestamps deemed invalid?

The Stellar Consensus Protocol orders block candidates (via ballots) by the maximum timestamp and union of their transactions. It says that "values [transactions/ballots] with invalid timestamps will ...
2
votes
1answer
59 views

How is the node ID assigned to a stellar core node?

Running the quorum command on a stellar-core node will presumably show the current node ID. The node ID looks like a stellar public account key. How is this assigned? Is the similarity to a public ...
4
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1answer
160 views

When is a slot created in the Stellar Consensus Protocol?

At what time during the protocol is a unique slot created for the nodes to vote on?
4
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1answer
73 views

How can a validator node earn trust on the network?

It's my understanding the SCP achieves consensus by having validator nodes agree with other validator nodes that they trust. Anyone can become a validator node, but won't they not actually be ...
10
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2answers
438 views

How does the Stellar Consensus Protocol prevent Sybil attacks?

A Sybil attack is an attack where a single adversary controls multiple nodes on a network in order to influence voting to their advantage. It is unknown to the rest of the network that the nodes are ...
18
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1answer
254 views

Are there any known weaknesses in the Stellar Consensus Protocol?

While SCP is superior to POW and POS in many ways, are there any known situations, although infrequent or difficult to meet, where the protocol could not work well or where the network can be attacked ...