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The bolt card system is built on the technologies listed below. The bolt card system is built on the technologies listed below.
- [LUD-03: withdrawRequest base spec.](https://github.com/fiatjaf/lnurl-rfc/blob/luds/03.md) - [LUD-03: withdrawRequest base spec.](https://github.com/fiatjaf/lnurl-rfc/blob/luds/03.md)
- with the exception of maxWithdrawable which should be returned as higher than the actual maximum amount
- [LUD-17: Protocol schemes and raw (non bech32-encoded) URLs.](https://github.com/fiatjaf/lnurl-rfc/blob/luds/17.md) - [LUD-17: Protocol schemes and raw (non bech32-encoded) URLs.](https://github.com/fiatjaf/lnurl-rfc/blob/luds/17.md)
- NFC Data Exchange Format (NDEF) - NFC Data Exchange Format (NDEF)
- Replay protection - Replay protection
- NXP Secure Unique NFC Message (SUN) technology as implemented in the NXP NTAG 424 DNA card - NXP Secure Unique NFC Message (SUN) technology as implemented in the NXP NTAG 424 DNA card
Bolt card systems may optionally support these technogies.
- [LUD-19: Pay link discoverable from withdraw link.](https://github.com/lnurl/luds/blob/luds/19.md)
- [LUD-21: pinLimit for withdrawRequest](https://github.com/bitcoin-ring/luds/blob/withdraw-pin/21.md)
## Bolt card and POS interaction ## Bolt card and POS interaction
the point-of-sale (POS) will read a NDEF message from the card, which changes with each use, for example the point-of-sale (POS) will read a NDEF message from the card, which changes with each use, for example