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Topic: [ANN] [PPC] PPCoin Released! - First Long-Term Energy-Efficient Crypto-Currency - page 35. (Read 684864 times)

legendary
Activity: 1638
Merit: 1013
I read somewhere that peercoin is working on an implementation of cold minting from a hardware wallet like Ledger Nano S. When do you foresee this to be implemented?
newbie
Activity: 33
Merit: 0
If the attacker forms a chain with higher chainweight, checkpoints won't hinder or help the reorg.  That higher weight chain will replace all instances of the current chain, regardless of if they have checkpoints enforced or not.  The only way to use checkpoints in an attack is to block the checkpoint server from the open internet.  The thing is, it's near impossible to find the IP address of the checkpoint server, because checkpoint authority is based on a cryptographic signature rather than an IP address.
legendary
Activity: 3906
Merit: 6249
Decentralization Maximalist
What do you mean when you say "lured into an attack chain"?  If the false chain is does not have more chainweight than the true chain, then you would have to prevent the checkpoint server from accessing the open internet, a feat that becomes very difficult if we implement multisig.  If it does have more chainweight, then it is by definition the true chain, so broadcasting it is not an issue.

I'm referring here to the "long-range attack" or "history attack" - e.g. the attacker would buy a large stake of coins, deposit them on his wallet (so he can cryptographically prove he "possessed" them), and then sell them again, but secretly minting a chain where he transfers the coins he supposedly sold to an address he controls via a double spend.

This chain would need to be "designed" so that it accumulates more chain weight than the "true" chain (so it's not a cheap attack -> he, in some moment, would have to possess a very large amount of coins, but he can sell them again).

If he can manage to spot the IP address of the "checkpoint server", I suppose he can try to lure him into a reorganization using his attack chain on multiple "fake nodes" that would try to connect to the checkpoint server.

It would be very probably worse than a normal history attack (where the attacker is trying to "lure" large minters into his chain) if most nodes still follow the centrally broadcasted checkpoints.
newbie
Activity: 33
Merit: 0
What do you mean when you say "lured into an attack chain"?  If the false chain is does not have more chainweight than the true chain, then you would have to prevent the checkpoint server from accessing the open internet, a feat that becomes very difficult if we implement multisig.  If it does have more chainweight, then it is by definition the true chain, so broadcasting it is not an issue.

Isolating the checkpoint server from the open internet is similar to isolating a single large minter.  You really can't do limitless damage, as all transactions and blocks have to be cryptographically valid.  The maximal disruption is probably along the lines of causing a fork between checkpoint enforced and checkpoint unenforced that will reorg to the heavier chain when the checkpoint server sees the open internet again.
legendary
Activity: 3906
Merit: 6249
Decentralization Maximalist
Checkpoints were made optional via an easily accessible checkbox in v0.6.  Developers still believe checkpoints have value as a voluntary option, especially if we do something like multisig checkpoints in the future.  Turning this feature off is currently as easy as unchecking a box in settings>options.
Yep, I knew that. However, even if some nodes disable the centrally broadcasted checkpoints, some will still follow them - and that converts them, in theory, in a vulnerability (it's not that the checkpoint key owner had to be an attacker, but it could be the case that his checkpoint server gets "lured" into an attack chain by an attacker), above all, if the checkpoint option is used by nodes that are minting.

I would prefer a rolling checkpoint scheme like in NXT and many other PoS cryptocoins. Or even Vitalik's exponential subjective scoring.
member
Activity: 117
Merit: 11
full member
Activity: 658
Merit: 100
excellent projet .. je vais voir si je peut investir dans ce ico cette année j'ai investit dans beaucoup de ico pourquoi pas celui la  Wink
newbie
Activity: 33
Merit: 0
centrally broadcasted checkpoints.

Checkpoints were made optional via an easily accessible checkbox in v0.6.  Developers still believe checkpoints have value as a voluntary option, especially if we do something like multisig checkpoints in the future.  Turning this feature off is currently as easy as unchecking a box in settings>options.
legendary
Activity: 3906
Merit: 6249
Decentralization Maximalist
The chainweight in Peercoin's security model was switched from coindays to PoS difficulty some time ago, coindays are only used to determine the mint reward.  So your concerns have already been accounted for in Peercoin.

Ah, ok, thanks for the information!

In this case, I think Peercoin - with the cold minting feature - would be fully prepared for the abolition of the centrally broadcasted checkpoints.
newbie
Activity: 33
Merit: 0
A maybe controversial comment: I'm for the abolition of the concept of coin-days entirely. That would, obviously, mean to follow the path that NXT and Peercoin clones like Blackcoin have taken, and for some may mean "throwing basic Peercoin principles". But afaik research on this topic, by various parties, has shown that coin-days is doing more harm than it is protecting the chain - because attackers, with this mechanism, can always accumulate more power with less stake and once they've accumulated enough power to be near an attack, can only be stopped with immense amounts of "staking coins".

The chainweight in Peercoin's security model was switched from coindays to PoS difficulty some time ago, coindays are only used to determine the mint reward.  So your concerns have already been accounted for in Peercoin.
legendary
Activity: 3906
Merit: 6249
Decentralization Maximalist
That are awesome news! I'm waiting for cold minting for years ...

Time to come back to Peercointalk? Wink

I've superficially read the Medium article and so far it seems a good proposal, will re-read it later because I've still not entirely understood some of the technical details.

A maybe controversial comment: I'm for the abolition of the concept of coin-days entirely. That would, obviously, mean to follow the path that NXT and Peercoin clones like Blackcoin have taken, and for some may mean "throwing basic Peercoin principles". But afaik research on this topic, by various parties, has shown that coin-days is doing more harm than it is protecting the chain - because attackers, with this mechanism, can always accumulate more power with less stake and once they've accumulated enough power to be near an attack, can only be stopped with immense amounts of "staking coins".
sr. member
Activity: 650
Merit: 318
Peercoin Update #8: The Peercoin Team outlines protocol changes that will enable cold minting, a way for proof of stake blocks to be securely minted offline from cold storage, helping to drastically expand the number and participation of minters, increasing network security...

https://medium.com/@PeercoinPulse/a-path-to-cold-minting-252acd310e82

We'd appreciate comments from the community.

Forum Post: https://talk.peercoin.net/t/update-8-a-path-to-cold-minting-a-way-for-proof-of-stake-blocks-to-be-securely-minted-offline-from-cold-storage-expanding-the-participation-of-minters-increasing-network-security/6465

Twitter: https://twitter.com/PeercoinPPC/status/932660836862189569

Reddit: https://www.reddit.com/r/CryptoCurrency/comments/7ea6en/a_path_to_cold_minting_a_way_for_proof_of_stake/
full member
Activity: 308
Merit: 112
peerchemistPeercoin Project Leader1d
Time to remake peercoin.net, let me know if you are interested with link to your portfolio.

2 Likes
sr. member
Activity: 364
Merit: 250
Me and my uncle bought about 40 PPC at $1 each. Plan to hold them long term, felt it was a good investment because it is the first POS coin, im amazed its not gone up before now to be honest.
full member
Activity: 308
Merit: 112
The difficulty is rising on peercoin over the last week up,about 20 percent
legendary
Activity: 3906
Merit: 6249
Decentralization Maximalist
Before Peercoin's been following litecoin why now everything has changed who knows?

I guess it has to do with two factors:

- Litecoin has sucessfully "rebranded" as the first larger cryptocurrency that activated Segwit and is implementing the Lightning Network. Analyzing their price charts you can clearly see the impact of this decision.
- Peercoin had a loooooooong time without substantial updates. Even the new 0.6+ version is still based on the olde 0.8 code, but it's a significant improvement and developers - as far as I know, I asked in the Peercointalk forum - are now preparing to update the code to a really modern Bitcoin version.

So if you asked me - PPC may have bottomed now, and may be an opportunity (Disclaimer: I hold a few Peercoins).

full member
Activity: 378
Merit: 121
"SWISSREALCOIN - FIRST REAL ESTATE CRYPTO TOKEN"
Before Peercoin's been following litecoin why now everything has changed who knows?
newbie
Activity: 56
Merit: 0
hi

How much is your Max Supply?
sr. member
Activity: 650
Merit: 318
Peerbox has now been updated to v0.6.1. Upgrade instructions here...

https://talk.peercoin.net/t/how-to-peerbox-support-thread-updated-to-v0-6-1/3827/174

Quote from: peerchemist
v0.6.1 is package is now in the repository.

To upgrade:

sudo apt update

sudo apt remove ppcoin

Now follow same upgrade instructions as desktop Peercoin release: https://medium.com/@PeercoinPulse/peercoin-v0-6-release-2831fb4394ad

(cleaning the old blockchain data)

reinstall:

sudo apt install peerbox

Fresh install is easy, business as usual.

I will repair bugs if there are some, but please note that this is last Peerbox update. I urge someone to take over the development, I simply no longer have spare time to do maintenance and introduce new features.
sr. member
Activity: 473
Merit: 250
Sodium hypochlorite, acetone, ethanol
Hi all can anyone inform me how many coins for a weekly stake at this moment, give or take ...

Cheers

Hi there,  for a weekly stake I think we're talking tens of thousands ppc on the wallet. May be 20k? I think so at least,  if anyone has got better estimations please feel free to add.

http://poscalculator.peercointalk.org/

Ok, I checked that out, and I am wondering how often you will receive PPC. Say, I am staking 100 coins, and it has been 30 days will I receive a fraction of PPC or will I have to wait till the end of the year to receive my roughly estimated 1 PPC?

you can receive fractions of PPC
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