Human-decimal amount (e.g. 1.31), per the financial-services BigNumber
convention. buildCreateEscrowTransaction scales it to raw on-chain base
units using the token's decimals; the row persists this decimal value.
Sender's self-custody Solana public key (base58). The on-chain signature
requirement is the real guard, so this is taken as supplied — there is no
wallet-ownership lookup.
Human-decimal amount (e.g. 1.31), per the financial-services BigNumber convention.
buildCreateEscrowTransactionscales it to raw on-chain base units using the token's decimals; the row persists this decimal value.