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-# secp256k1 from Scratch — Learning Plan
-
-Building ECDSA on secp256k1 in Go, from first principles.
-
-**Goal:** Understand the math deeply, not just copy formulas. End with a working (non-production) implementation.
-
----
-
-## Progress
-
-### Part 1: Foundations
-- [x] **Modular arithmetic** — clock math, remainders, finite sets
-- [x] **Modular division/inverses** — finding multiplicative inverses
-- [x] **What is an elliptic curve** — y² = x³ + 7, points as (x, y) pairs
-
-### Part 2: Curve Operations
-- [ ] **Point addition** — adding two points geometrically and algebraically
-- [ ] **Point doubling** — special case when adding a point to itself
-- [ ] **The point at infinity** — identity element (like zero for addition)
-- [ ] **Scalar multiplication** — multiplying a point by an integer (repeated addition)
-
-### Part 3: Key Pairs
-- [ ] **Generator point G** — the "starting point" everyone uses
-- [ ] **Private key** — just a random big number
-- [ ] **Public key** — private key × G (scalar multiplication)
-- [ ] **Why it's hard to reverse** — the discrete log problem
-
-### Part 4: ECDSA Signing
-- [ ] **What a signature proves** — "I know the private key for this public key"
-- [ ] **The signing algorithm** — k, r, s explained
-- [ ] **Why random k matters** — reuse = leaked private key
-
-### Part 5: ECDSA Verification
-- [ ] **The verification equation** — checking without knowing the private key
-- [ ] **Putting it together** — sign and verify a message
-
-### Part 6: Implementation
-- [ ] **Field element type** — big.Int wrapper with mod p
-- [ ] **Point type** — x, y coordinates + infinity
-- [ ] **Point addition/doubling** — the core math
-- [ ] **Scalar multiplication** — double-and-add algorithm
-- [ ] **ECDSA sign/verify** — the full flow
-- [ ] **Test against known vectors** — verify correctness
-
----
-
-## Code Location
-
-`/home/ai/vault/projects/secp256k1-learn/`
-
-We'll build incrementally:
-- `field.go` — modular arithmetic
-- `point.go` — curve points and operations
-- `ecdsa.go` — signing and verification
-- `main.go` — demo/test harness
-
----
-
-## Resources
-
-- secp256k1 parameters: p, n, G coordinates
-- Test vectors from Bitcoin/Nostr for verification
-- No external crypto libraries (that's the point)
-
----
-
-## Notes
-
-*Add observations, "aha" moments, or questions here as we go.*
-