diff --git a/data/blog/seventeenth-wave-of-bitcoin-grants.mdx b/data/blog/seventeenth-wave-of-bitcoin-grants.mdx
index 9c8cd17c0..0841fb342 100644
--- a/data/blog/seventeenth-wave-of-bitcoin-grants.mdx
+++ b/data/blog/seventeenth-wave-of-bitcoin-grants.mdx
@@ -152,7 +152,7 @@ License: MIT
 [Krux]: /blog/bitcoin-grants-december-2023#krux
 [SeedSigner]: https://seedsigner.com/
 [Liquid Network]: /topics/liquid-network
-[`BIP-85`]: https://github.com/bitcoin/bips/blob/master/bip-0085.mediawiki
+[`BIP-85`]: /topics/bip-85
 [cryptoadvance/specter-diy]: https://github.com/cryptoadvance/specter-diy
 
 ---
diff --git a/data/topics/bip-85.mdx b/data/topics/bip-85.mdx
new file mode 100644
index 000000000..03ac7ee16
--- /dev/null
+++ b/data/topics/bip-85.mdx
@@ -0,0 +1,19 @@
+---
+title: 'BIP 85'
+summary: 'A standard for deriving independent child entropy, mnemonics, and seeds from one master BIP 32 root key.'
+category: 'Bitcoin'
+aliases: ['BIP85', 'deterministic entropy', 'child mnemonics', 'derived seeds']
+---
+
+BIP 85 defines a way to derive fresh wallet entropy from one master [BIP 32](/topics/bip-32) root key. One root seed can produce separate child secrets for different devices, apps, and use cases, while still giving the user one backup to keep safe.
+
+The standard derives a hardened child key and runs it through HMAC-SHA512 to produce application-specific entropy. Wallets can turn that entropy into a 12-word, 18-word, or 24-word BIP 39 mnemonic, an HD seed, a [WIF](/topics/wif), or other formats covered by the spec. Each child output stays isolated from the others, so one exposed child mnemonic does not expose the parent seed or sibling children.
+
+BIP 85 is useful for people who want separate wallets for spending, savings, testing, or signing devices without managing a growing stack of backups. It also shows up in tools like [Specter DIY](/blog/seventeenth-wave-of-bitcoin-grants#specter-diy), which added support for BIP 85 derived seeds as part of its broader device roadmap.
+
+## References
+
+- [BIP 85](https://github.com/bitcoin/bips/blob/master/bip-0085.mediawiki)
+- [BIP 39](https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki)
+- [BIP 32](https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki)
+- [bips.dev: BIP 85 rendered](https://bips.dev/85/)