I'm only trying to understand I'm not trying to judge your work, but I need some clarification.
- Initiation Phase: It takes just few seconds for the miners to produce one or (barely) 2 or 3 Initiation Blocks typically. Note that the transaction fees are already transferred to miner's wallet through coinbase transaction committed to the Net Merkle Tree's root for each block.
As I can understand a net merkle is a merkle tree where the coinbase transaction have no block rewards(only comulated fee) so each miner will try to publish his net merkle tree with a coinbase tree pointing to his address.
why are you saying there will be only one or (barely) 2 o 3 initialization blocks? why a miner should use a net merkle tree with a coinbase pointing to an address owned by other miner? where is the incentive to start contribution phase loosing transaction fees? or I'm missing something.
5% difficulty requirement for Prepared Block causes one block to be generated in every 3 seconds, during the preparation phase, network latency and the required time for miners to decide ending preparation attempts and starting contribution phase may take up to 10 seconds, I guess.
When the first few Prepared Blocks have been already propagated in the network, other miners have tried their chance to win the fees and failed to do so. It is not a big deal tho, in the worst case it is about wasting like 5% of the resources and the transaction fees at the same time. Just like when a new block arrives and you have missed your chance to hit. Typically total transaction fees for a fully saturated block is about 0.5 btc i.e. 0.04 with respect to the current 12.5 btc block reward.
From this point on(having few published Prepared Blocks in hand) , the race is about winning the block reward (main meal) and it is of all miners best interest to forget about the previous race (winning tr fees) and focus on the live one(winning block reward).
- Contribution Phase: Miners start picking one valid Initiation Block's Merkle root, according to their speculations (which become more accurate as new shares are submitted to the network) about it to get enough shares eventually, and producing/relaying valid Contribution Shares for it.
As the sum of the difficulty scores for a given Initiation Block's Merkle root grows we expect an exponential convergence rate for the most popular Merkle root to be included in Contribution Shares.
They will share an inizialization block, adding their address, and their, partial, proof of work to earn score.
- Finalization Phase: After the total scores approaches the 0.93 limit, rational Miners would begin to produce a Finalized block
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as soon as a miner get enought shares(with partial proof of work) it can begin trying to solve a more difficult proof of work to get only a partial block reward. But producing a final block is very hard as any contrib share can point to a different net merkle tree(because every miner will add a coinbase transaction using his address to earn fees), so he have to validate the same transactions more and more times to be sure final block wil be considered valid. So I hope it is better for a miner to simply autoproduce his net merkle tree and his contribution shares so he doesn't have to share block reward with others contributors and to get the full fee booty.
So I can not understand where is the point in using contribution shares from others miners?
No you are missing the most important point here. Contribution shares don't point to different merkle trees, it is the magic of what I have defined as
Net Merkle Tree, it is shared among most of the miners because it contains no block reward related information, just the real world transactions and their fees. Miners do not change this tree and produce contribution shares that commit it again and again. This is why these shares can be used as an objective evidence of resource consumption of their respected producers.
EDIT:
Please pay enough attention that in contribution phase, miners don't mine blocks, they mine
Contribution Shares instead that can be easily included in the
Shared Coinbase Transaction in Finalization Phase. As I've already explained in the first post.