> For the complete documentation index, see [llms.txt](https://martian1337.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://martian1337.gitbook.io/notes/security-engineering/payments-fraud-and-digital-asset-security.md).

# Payments, Fraud, and Digital-Asset Security

Payment and transaction security, crypto exchange and custody, blockchain and smart contracts, and fraud, abuse, and bot defense.

## Areas

* [Payment and Transaction Security](/notes/security-engineering/payments-fraud-and-digital-asset-security/payment-and-transaction-security.md)
* [Cryptocurrency Exchange and Custody Security](/notes/security-engineering/payments-fraud-and-digital-asset-security/cryptocurrency-exchange-and-custody-security.md)
* [Blockchain and Smart Contract Security](/notes/security-engineering/payments-fraud-and-digital-asset-security/blockchain-and-smart-contract-security.md)
* [Fraud, Abuse, and Bot Defense](/notes/security-engineering/payments-fraud-and-digital-asset-security/fraud-abuse-and-bot-defense.md)