# Details

- [Hash Functions](/important-concepts/details/cryptographic-hash-functions.md)
- [Merkle Trees](/important-concepts/details/merkle-trees.md)
- [Sighash Flags](/important-concepts/details/sighash-flags.md)
- [Script](/important-concepts/details/script.md)
- [SPV](/important-concepts/details/spv.md)
- [Deep Dive](/important-concepts/details/spv/deep-dive.md): Some low level explainers and examples to improve understanding.
- [Payments Flow](/important-concepts/details/spv/payments-flow.md): Paymail Capability Extensions
- [Data Models](/important-concepts/details/spv/data-models.md): What data is sent between counterparties for SPV Payments?
- [Broadcasting](/important-concepts/details/spv/broadcasting.md): Transaction Broadcasting from SPV Wallet