Fundamentals
Protocol concepts compared across chains: what the same word means on each.
Processed, safe, finalized: what "final" means on Solana, Ethereum, Stellar, TON and sequencer L2s
Every chain has a word for "this won't change any more", and the words do not line up. A mapping of the five models, what each API lets you ask for, and how to pick a threshold for a deposit versus a UI.
Priority fees on Solana vs Ethereum, Base and Polygon: same word, different auctions
A "priority fee" is a bid in every system that uses the word, but what it bids for, who receives it and how you should estimate it differ per chain — and on one chain it buys nothing at all.
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