> For the complete documentation index, see [llms.txt](/ko/llms.txt).

See a list of terms about/related to the PowPeg App and their meanings.

## Summary

PowPeg App glossary terms for BTC ↔ rBTC transfers. Mainnet: [powpeg.rootstock.io](https://powpeg.rootstock.io/). Testnet: [powpeg.testnet.rootstock.io](https://powpeg.testnet.rootstock.io/).

### Key terms

| Term | Definition |
|------|------------|
| PowPeg App | Web app for BTC and rBTC exchange between Bitcoin and Rootstock |
| Peg-in | BTC to rBTC. Final after ~100 Bitcoin block confirmations |
| Peg-out | rBTC to BTC. Locks rBTC on Rootstock and releases BTC on Bitcoin |
| Flyover transactions | Fast peg-in option via liquidity providers. See `/developers/integrate/flyover/` |
| Amount in BTC | Minimum peg-in amount: 0.005 BTC |
| Device account address | Bitcoin address you send from |
| Destination Rootstock address | Rootstock address that receives rBTC |
| Refund Bitcoin address | Bitcoin address for refunds |
| Legacy address | Original BTC address format. Higher transaction fees |
| SegWit address | Newer format with lower fees. Segregates witness data |
| Native SegWit address | Bech32 format. Lower fees when supported |
| Hardware wallet | Physical device (Ledger, Trezor) for key storage |
| Software wallet | App on computer or phone that stores private keys |
| BIP39 passphrase | Optional 25th word extending a hardware wallet seed |
| Mainnet | Production network. Assets have real value |
| Testnet | Development network. Use tRBTC from [faucet.rootstock.io](https://faucet.rootstock.io/) |
| Network fee | Fee paid to the blockchain network for a transfer |
| Transaction fee | Fee shown in BTC and USD |
| Transaction total | BTC amount plus selected transaction fee |
| PowPeg Protocol | 2-way peg secured by Bitcoin merge-mining hash rate |

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