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ouroboros-network
Specifications of network protocols and implementations of components running these protocols which support a family of Ouroboros Consesus protocols; the diffusion layer of the Cardano Node.
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So from what I gather the transaction fee is a fixed protocol parameter. I like how fees are distributed amongst the epoch, If I had to design a blockchain system I'd also have chosen this approach TBH. It addresses some of the issues and misaligned incentives if you only have to rely on fees for block rewards. However if the demand for transactions constantly outweighs the available space you get into other issues. I tried to find details on how Cardano handles transactions and manages its mempool. I believe somewhere here is the code? (https://github.com/input-output-hk/ouroboros-network/blob/master/ouroboros-consensus/src/Ouroboros/Consensus/Mempool/Impl.hs)