From d641f4566f051656bae79e406155c4f7f65ec338 Mon Sep 17 00:00:00 2001
From: Clawd <ai@clawd.bot>
Date: Fri, 20 Feb 2026 18:52:08 -0800
Subject: embed secp256k1: replace btcec with internal pure-go implementation

This removes all external dependencies by embedding the secp256k1-learn
implementation into internal/secp256k1.

Changes:
- Add internal/secp256k1 with field arithmetic, curve ops, keys, schnorr
- Update keys.go to use internal secp256k1 package
- Remove btcec/btcutil dependencies (go.mod is now clean)
- All tests pass

Tradeoffs:
- ~10x slower crypto ops vs btcec (acceptable for nostr use case)
- Not constant-time (documented limitation)
- Zero external dependencies

Refs: code.northwest.io/secp256k1-learn
---
 go.mod | 8 --------
 1 file changed, 8 deletions(-)

(limited to 'go.mod')

diff --git a/go.mod b/go.mod
index e63be4c..5fd9f48 100644
--- a/go.mod
+++ b/go.mod
@@ -1,11 +1,3 @@
 module code.northwest.io/nostr
 
 go 1.25
-
-require github.com/btcsuite/btcd/btcec/v2 v2.3.4
-
-require (
-	github.com/btcsuite/btcd/chaincfg/chainhash v1.1.0 // indirect
-	github.com/decred/dcrd/crypto/blake256 v1.1.0 // indirect
-	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 // indirect
-)
-- 
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