I am trying to understand what happens under the hood when we call window.solana.signMessage.
What is the algorithm Phantom Wallet (Solana) uses to sign messages?
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Solana uses the ed25519 curve for its cyrptography, so a transaction signature is:
The actual code called is
tweetnacl'ssign.detachedfunction.More information at the official docs: https://docs.solana.com/terminology#signature
The Solana transaction sign code: https://github.com/solana-labs/solana/blob/2a5764ef79cff391da080cc19617f171109c4158/web3.js/src/transaction.ts#L522
The underlying tweetnacl code: https://github.com/dchest/tweetnacl-js/blob/971d653d301cff2dd694e95a099cb42d9201e922/nacl.js#L1076