Added transaction weight to Moneropedia.

[tonyern]

No description provided.

[tonyern]

I saw this on the issues page. It is issue #905. I made a basic layout of everything. I'm not that experienced with Monero and the blockchain to add anything to it so I'm hoping others can help add info as needed.

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[erciccione]

I think this is a good start, but i wouldn't create a Moneropedia entry for a couple of lines of explanation. Any idea on how to expand the entry?

[tonyern]

Not sure how to expand it.

[apertamono]

Sources: the fee calculation is discussed in Mastering Monero section 5.5.3.3, which may be outdated after changes in 2019. ArticMine's talk can be found here. I'll try to write a longer text if I understand this.

[erciccione]

Note that thee fee structure is being revisited: monero-project/monero#7819

[apertamono]

OK, the transaction weight isn't the most complicated part of the fee calculation or the dynamic blocksize. What do you think about the following text? I don't think we should include the precise calculation, which isn't done for other entries either. Relevant slide from ArticMine's talk: https://i.imgur.com/MNw5Pda.png

After @Bulletproofs significantly decreased the size of range proofs in Monero @transactions, the original transaction size was still relevant for verification times. While proofs are relatively more efficient for a larger number of outputs, verifying each output will require a similar amount of time. To properly price the cost of verification, a 'clawback' is added to the transaction size of transactions with more than 2 outputs. The sum of the transaction size and this clawback is the transaction weight. For miners, the block weight is the sum of the weights of all transactions to be included in the block.

Not to be confused with Bitcoin's [weight units](https://en.bitcoin.it/wiki/Weight_units) introduced in the Segwit soft-fork, a different type of transaction weighting for different reasons.

[apertamono]

Note that thee fee structure is being revisited: monero-project/monero#7819

Thanks for the warning. Looking at the discussion and changed files, I don't think this will affect the transaction weight or my proposed text. On the other hand, this suggests that explaining the transaction weight only explains a small detail of the fee calculation.