> For the complete documentation index, see [llms.txt](https://docs.zkbob.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zkbob.com/implementation.md).

# Technical Implementation

- [zkBob Application Overview](https://docs.zkbob.com/implementation/high-level-overview.md): Main system components
- [Deployed Contracts](https://docs.zkbob.com/implementation/deployed-contracts.md): zkBob deployed contracts
- [Smart Contracts](https://docs.zkbob.com/implementation/contracts-and-circuits.md): EVM-based
- [zkBob Pool Contract](https://docs.zkbob.com/implementation/contracts-and-circuits/the-pool-contract.md): Main transaction processor
- [Transaction Calldata](https://docs.zkbob.com/implementation/contracts-and-circuits/the-pool-contract/transaction-calldata.md): Reference tables with calldata structure for different transaction types
- [Bob Token Contract](https://docs.zkbob.com/implementation/contracts-and-circuits/token-contract.md): The BOB token serviced by the Pool
- [Verifier contracts](https://docs.zkbob.com/implementation/contracts-and-circuits/verifier-contracts.md): Used to verify transaction and tree zkSNARK proofs
- [Operator Manager Contract](https://docs.zkbob.com/implementation/contracts-and-circuits/operator-manager-contract.md): Manages relayers access to the Pool
- [Mutable Operator Manager](https://docs.zkbob.com/implementation/contracts-and-circuits/operator-manager-contract/mutable-operator-manager.md): The simple operator manager with relayer change support
- [Voucher (XP) Token Contract](https://docs.zkbob.com/implementation/contracts-and-circuits/voucher-token-contract.md): Reward users for account usage, future version implementation
- [Accounts and Notes](https://docs.zkbob.com/implementation/account-and-notes.md): The common entities
- [Accounts](https://docs.zkbob.com/implementation/account-and-notes/accounts.md): Define a customer wallet state
- [Notes](https://docs.zkbob.com/implementation/account-and-notes/notes.md)
- [Relayer Node](https://docs.zkbob.com/implementation/relayer-node.md): An intermediary between zkBob clients and contract
- [Relayer Operations](https://docs.zkbob.com/implementation/relayer-node/relayer-operations.md): Relayer lifecycle detailed description
- [Optimistic State](https://docs.zkbob.com/implementation/relayer-node/optimistic-state.md): Optimistic state description
- [REST API](https://docs.zkbob.com/implementation/relayer-node/rest-api.md): To interact with the relayer
- [zkBob Keys](https://docs.zkbob.com/implementation/zkbob-keys.md): Different key types
- [Address derivation](https://docs.zkbob.com/implementation/zkbob-keys/address-derivation.md): Private payment address
- [Ephemeral keys](https://docs.zkbob.com/implementation/zkbob-keys/ephemeral-keys.md): Receiving key
- [zkSNARKs & Circuits](https://docs.zkbob.com/implementation/zksnarks-and-circuits.md)
- [Transfer verifier circuit overview](https://docs.zkbob.com/implementation/zksnarks-and-circuits/transaction-verifier-circuit.md)
- [zkBob Merkle Tree](https://docs.zkbob.com/implementation/untitled.md): The main data structure
- [The Poseidon Hash](https://docs.zkbob.com/implementation/untitled/the-poseidon-hash.md): Used for the different purposes
- [Elliptic Curve Cryptography](https://docs.zkbob.com/implementation/elliptic-curve-cryptography.md): Baby-JubJub curve
- [Transaction Overview](https://docs.zkbob.com/implementation/transaction-overview.md): An atomic operation on the blockchain
- [Common Structure](https://docs.zkbob.com/implementation/transaction-overview/common-structure.md): Public and secret fields
- [Memo Block](https://docs.zkbob.com/implementation/transaction-overview/untitled-1.md): The main transaction part containing the encrypted data to restore balances and history
- [Memo Block Encryption](https://docs.zkbob.com/implementation/transaction-overview/untitled-1/memo-block-encryption.md): Used to encrypt accounts, notes and shared keys
- [Transaction Types](https://docs.zkbob.com/implementation/transaction-overview/transaction-types.md): Deposit, transfer, withdrawal
- [Nullifiers](https://docs.zkbob.com/implementation/transaction-overview/the-nullifiers.md): Double-spending protection
- [Signing a Transaction](https://docs.zkbob.com/implementation/transaction-overview/signing-a-transaction.md): To prove an input account ownership
- [The Transaction Lifecycle](https://docs.zkbob.com/implementation/transaction-overview/the-transaction-lifecycle.md): From the user to the contract
- [Client Library SDK](https://docs.zkbob.com/implementation/client-library-sdk.md): Client library v5.4.0 development guide
- [Configuration](https://docs.zkbob.com/implementation/client-library-sdk/configuration.md)
- [Initializing the client](https://docs.zkbob.com/implementation/client-library-sdk/configuration/initializing-the-client.md): Instantiating the client object
- [Client Configuration](https://docs.zkbob.com/implementation/client-library-sdk/configuration/initializing-the-client/client-configuration.md): Configure the common parameters
- [Attaching a User Account](https://docs.zkbob.com/implementation/client-library-sdk/configuration/attaching-a-user-account.md): Switching library to the full state mode
- [Account Configuration](https://docs.zkbob.com/implementation/client-library-sdk/configuration/attaching-a-user-account/account-configuration.md): Configure the customer's wallet
- [Switching Between Pools](https://docs.zkbob.com/implementation/client-library-sdk/configuration/switching-between-pools.md): In the multi-pool configurations
- [Account-less Mode Operations](https://docs.zkbob.com/implementation/client-library-sdk/account-less-mode-operations.md): You can use these methods without any user credentials
- [Converting Token Amounts](https://docs.zkbob.com/implementation/client-library-sdk/account-less-mode-operations/converting-token-amounts.md): Between native and pool dimensions
- [Transaction Fees](https://docs.zkbob.com/implementation/client-library-sdk/account-less-mode-operations/transaction-fees.md): Requesting and estimation
- [Transaction Constraints](https://docs.zkbob.com/implementation/client-library-sdk/account-less-mode-operations/transaction-constraints.md): Parameters needed to create a tx
- [Using the Delegated Prover](https://docs.zkbob.com/implementation/client-library-sdk/account-less-mode-operations/using-the-delegated-prover.md): To reduce proof time computation time
- [Getting the State](https://docs.zkbob.com/implementation/client-library-sdk/account-less-mode-operations/getting-the-state.md): The state of the Merkle tree: relayer and contract
- [Gift Cards](https://docs.zkbob.com/implementation/client-library-sdk/account-less-mode-operations/gift-cards.md): Encoding and decoding URLs for gift cards
- [Client Library Status](https://docs.zkbob.com/implementation/client-library-sdk/account-less-mode-operations/client-library-status.md): Retrieving the client state
- [Helpers](https://docs.zkbob.com/implementation/client-library-sdk/account-less-mode-operations/helpers.md)
- [Versioning](https://docs.zkbob.com/implementation/client-library-sdk/account-less-mode-operations/versioning.md): Library, relayer and prover version information
- [Full Mode Operations](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations.md): You can use it only with an attached account
- [Balances and History](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/balances-and-history.md): Retrieve user's shielded funds and activity
- [Shielded Addresses](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/shielded-addresses.md): Used to transfer funds inside a privacy pool
- [Account State](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/account-state.md): Low-level routines to interact with the a local Merkle tree
- [Fee Estimations](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/fee-estimations.md): Calculating exact fee values for the different transactions
- [Transaction Configuration](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/transaction-configuration.md): Getting transaction parts and maximum amount to transfer/withdraw
- [Sending Transactions](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/sending-transactions.md): Deposit, transfers and withdrawals
- [Transaction Maintenance](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/transaction-maintenance.md): Monitoring transactions after sending
- [Direct Deposits](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/direct-deposits.md): External transactions to the privacy pool
- [Gift Cards Maintenance](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/gift-cards-maintenance.md): Getting balance and redemption
- [Ephemeral Deposits](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/ephemeral-deposits.md): Using ephemeral 0x-accounts served on the library side
- [Forced Exit](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/forced-exit.md): Emergency funds withdrawal in case the relayer is unavailable
- [Other Routines](https://docs.zkbob.com/implementation/client-library-sdk/full-mode-operations/other-routines.md): Statistic routines etc
- [Common Types](https://docs.zkbob.com/implementation/client-library-sdk/common-types.md): The types used within the different library methods
- [Full Functions List](https://docs.zkbob.com/implementation/client-library-sdk/full-functions-list.md): All available functions of ZkBobClient object
- [Utilities](https://docs.zkbob.com/implementation/client-library-sdk/utilities.md): Auxiliary routines