instead of a consensus on the information the block has, it focuses on maintaining agreement on the time of the event as a way of validation. each node gets a synchronized clock and the nodes are validating time not necessarily the information on the blockchain; which can go as far back as the genesis block. this allows maximum throughput limited only by hardware which should be a reasonable solution for scaling to the theoretical 700k TPS in the near future.
@@ferahl the clocks Introduce a verifiable delay function every half second that triggers a signal from the next clock and so on. On the Solana RU-vid page they have an indept overview of the security side of things relative to their scalability. The audio isn't the best but still worth a listen if you are interested.
Time based proof mechanisms are the key to syncing a distributed ledger. Need more info on Sol's POH though: -Where is the "clock's" ultimate source? Is it written in the node's downloaded code? Does it sync with other active nodes? Other? -How many nodes are required to approve a transaction? (Since POH avoids the requirement of network wide approval). -What is the governance structure? -Who decides software updates?
"Where is the "clock's" ultimate source? Is it written in the node's downloaded code? Does it sync with other active nodes? Other?" Will try to answer in good faith: The clocks source is the genesis block. it just stacks sha256 hash upon hash very rapidly including info from current tx and from prior hash, such that it is impossible for a byzantine opponent to race ahead of it, like physically impossible hardware wise, at least to the extent needed for a byzantine opponent to fake out the system. compared to btc hashing and making a chain, btc is solving a puzzle, variable time, solana clock is based on achieving near fastest time possible .... to do a single hash(not trillions of hashes like btc does on a single block to get enough leading zeros to satisfy the puzzle requirement of btc mining). So the nodes do not have to communicate with each other to the extent they do in pbft, they can know there is simply no way for many fake blocks to come in, as there is literally not enough time to fake several timestamps. -How many nodes are required to approve a transaction? (Since POH avoids the requirement of network wide approval). -What is the governance structure? -Who decides software updates?
Guys they aren't sync the clock/time viva. Instead they use there local time, for example if you live in usa, you have your own time, and i live in nepal, we have different time but it can be equalized by this formula :- 12 pm of usa = 6pm of nepal. Using this formula this is automatically synchronized. And there are validators who validate the leaders work, if he/she cheats then validators dis-votes him/her(node). And he is out thrown, Also to become a validator you must go through pos system, both validator and leader can peneltaized for fake information. full peneltay and half peneltay. The blockchai network, the nodes communicate with each others, they vote each other's, voting process :- 1) high internet connection : +vote 2) high ssd : +vote 3) cheating : negative vote, 4) etc etc there own mechanism This is for election. All the validators and leaders are elected in this way.
How this Proof of History helps me if I am a node on Solana. Do I have to store less transactions? Do I process less number of transactions? Does it reduce my network bandwidth requirements?
This video doesn't explain very well what is the use of the time stamps. Time stamps (in electronic form) have existed for a long time outside the context of decentralized applications. If I take a photo with my iPhone, the photo gets a time stamp so that afterwards I know which photo was made when. No need to connect it to a decentralized platform to make it work, it works fine when centralized.
people could fake the timestamp on your iphone. say the NSA, they could not only fake the timestamp, they could deepfake the picture itself, it is not secure per se. Solana POH is a system designed to keep running against the worst byzantine/NSA opponent we can imagine. Also Apple, could just change its policy and lock you out of your iphone entirely right now maybe?
btc does hashes for its chain too. Some differences: solana does the hash only once, and stacking these on top of each other for a "count" or a timestamp, it is not making the hash a "puzzle" like bitcoin is, and the hash is done very fast, by fast computers, such that a byzantine opponent could not race ahead, and produce enough hashes to fake the time stamp nature of the recurrent hashes. the best an opponent could do is stay even with the solana clock..... so therefore the hash serves as proof of history/acts as timestamp, in that there is literally not enough time for byzantine opponent to slip fake blocks in properly stamped. So the nodes do not need to communicate with each other, the time stamp serves as a verifiable communication that the block is proper, as there is not enough time to fake a block with a proper stamp. May not be correct per se, but Hope that helps, just learning this myself
Is this blockchain time stamp function unique to Solana? Is it not using open / free code that others can copy now? Tx for any explanation. Can Cardano use same function, for example, to timestamp or deduce sequence of events if needed?
Yet there's no mechanism to prevent arbitrary reordering by validators, MEV incentives are really perverse... there's no excuse, even keeping priority fees they could only matter towards getting the transaction through or not, but keeping validators from being able to arbitrarily reorder transactions. And you could use virtual voting (like Hedera) to lower validator cost. It's only setup the way it is to allow for MEV, either because the decision makers want it, or decided to tolerate it.
0:27 "as a function of real time" -> which function? Different hosts have different knowledge of real time. 0:38 "almost like a cryptographic timestamp" -> almost? I'm sorry but this explanation is not clear at all.
comparing to btc helped me. btc uses hashes as a puzzle to be solved, has to have leading zeros, so each block has trillions of hash attempts run on it, varying the block a bit each time by altering the "nounce" then doing a hash of that, checking to see if it is < the mining goal, if < then publish win, if > then increase nounce, redo hash. Solana POH is just doing a single hash on the block, using prior block hash and the tx date in the block..... one hash only per block, and here is the key, the block time is so fast, there is literally only time to generate one hash before the block gets finalized. So there is not time to cheat, and there is not computers that are faster than solana nodes that can hash fast enough to make a fake chain. It is easier to think of POH as just ordering blocks, but there actually is an actual clock like nature to it, take a second hand on analog clock, or even an older car digital clock it gets off time... not quite exact.... Solana sha256 hash clock does keep track of "time" within some limit..... But thinking along this path is not neccessary per se (what it time? no one knows, etc) and maybe counterproductive, POH order blocks sequentially such that a byzantine opponent cannot insert fake blocks in, and such that nodes do not need to send blocks back and forth, they already have the same answer each block has, because each nodes sha256 hash 'clock" is in the same state.
I'm confident in the long-term prospects of Web3 Infinity INFTY3. Its groundbreaking technology and unique value proposition set it apart from the crowd.
@Milan a if ETH priorize POS net in future, Cardano and Sol send to waste of history, ETH is much stronger finnancially and can keep higher staking rewards ale have much more trustability. SOL is now great trap for money, if anyone big player dump his money back and seel it, price of SOL go >50$ and all who bought it 50+ loose money for all the time, and can hodl it to and of his life ..
@Milan a Its not too probable, if ETH in future switch mainnet to POS and i think ETH is much stronger finnancial keep higher staking rewards ADA, SOL and others that accumulating money over staking go to hell and much money swaps to ETH and his price go to moon. Its maybe run for long time 2025 or later.
Solana (SOL) is a really great project. Its potential is huge and they received multiple rounds of investments summing up to already hundreds of million of dollars. Good buy.
