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In a manner similar to centralized exchanges, which take in deposited assets and keep track of user balances within their database, the Finterest Protocol also accepts asset deposits and manages individual user balances within its canister using a structure known as the book balance. Please see #Depositing Assets and #Withdrawing Assets for instruction on sending and removing assets from the canister.
get_book_balance: (Token, principal) -> (opt nat) query;
Where token type is listed below
type Token = principal
dfx canister --network ic call z4viz-kiaaa-aaaal-qbxmq-cai get_book_balance '(principal <token_principal>, principal <your principal>)'
We show an example to get the the book balance of ICP for an actual prinicipal
dfx canister --network ic call finrisk get_book_balance '(principal "z4viz-kiaaa-aaaal-qbxmq-cai", principal "e72ak-uu5s4-t3uba-ldsg5-yx7du-cn5t4-cvqoc-fkgoz-akjmp-3bljs-3qe")'