Add digital artifacts page to handbook (#1165)

docs/src/SUMMARY.md

@@ -1,6 +1,7 @@
 # Summary
 [Introduction](introduction.md)
 - [Overview](overview.md)
+- [Digital Aritacts](digital-artifacts.md)
 - [Inscriptions](inscriptions.md)
 - [FAQ](faq.md)
 - [Contributing](contributing.md)

docs/src/digital-artifacts.md

@@ -0,0 +1,41 @@
+Digital Artifacts
+=================
+
+Imagine a physical artifact. A rare coin, say, held safe for untold years in
+the dark, secret clutch of a Viking hoard, now dug from the earth by your
+grasping hands. It…
+
+…has an owner. You. As long as you keep it safe, nobody can take it from you.
+
+…is complete. It has no missing parts.
+
+…can only be changed by you. If you were a trader, and you made your way to
+18th century China, none but you could stamp it with your chop-mark.
+
+…can only be disposed of by you. The sale, trade, or gift is yours to make,
+to whomever you wish.
+
+What are digital artifacts? Simply put, they are the digital equivalent of
+physical artifacts.
+
+For a digital thing to be a digital artifact, it must be like that coin of
+yours:
+
+- Digital artifacts can have owners. A number is not a digital artifact,
+  because nobody can own it.
+
+- Digital artifacts are complete. An NFT that points to off-chain content
+  on IPFS or Arweave is incomplete, and thus not a digital artifacts.
+
+- Digital artifacts are permissionless. An NFT which cannot be sold without
+  paying a royalty is not permissionless, and thus not a digital artifact.
+
+- Digital artifacts are uncensorable. Perhaps you can change a database entry
+  on a centralized ledger today, but maybe not tomorrow, and thus one cannot be
+  a digital artifact.
+
+- Digital artifacts are immutable. An NFT with an upgrade key is not a digital
+  artifact.
+
+The definition of a digital artifact is intended to reflect what NFTs *should*
+be, sometimes are, and what inscriptions *always* are, by their very nature.