> For the complete documentation index, see [llms.txt](https://xchainjs.gitbook.io/xchainjs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xchainjs.gitbook.io/xchainjs/providers/xchain-utxo-providers/how-it-works.md).
# How it Works
This section for the XChain UTXO Providers package offers insight into the operational workflow and mechanisms involved in interacting with Unspent Transaction Output (UTXO) providers within blockchain networks.
A specification outlines a generalized interface for API providers, intended for use with XChainJS implementations.
These providers should refrain from generating keys themselves; instead, the xchain-crypto library should handle this task to ensure compatibility across different blockchains.
The providers are solely provided with a master BIP39 phrase, from which they decode a temporary key and address as needed.
### Design
The UtxoOnlineDataProvider has the following signature:
```
import { Address, Asset } from '@xchainjs/xchain-util'
import { ExplorerProvider } from './explorer-provider'
import { Balance, Network, Tx, TxHash, TxHistoryParams, TxsPage } from './types'
export type Witness = {
value: number
script: Buffer
}
export type UTXO = {
hash: string
index: number
value: number
witnessUtxo: Witness
txHex?: string
}
export interface OnlineDataProvider {
getBalance(address: Address, assets?: Asset[]): Promise
getTransactions(params: TxHistoryParams): Promise
getTransactionData(txId: string, assetAddress?: Address): Promise
}
export interface UtxoOnlineDataProvider extends OnlineDataProvider {
getConfirmedUnspentTxs(address: Address): Promise
getUnspentTxs(address: Address): Promise
broadcastTx(txHex: string): Promise
}
```
### Supported Providers
#### Sochain v3