Move docs to spec

spec/protocol/Constants.md

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+# Constants
+
+### Types
+
+These are the list of types used to represent various properties within the
+protocol.
+
+| Alias           | Type                                         |
+|-----------------|----------------------------------------------|
+| SeraiAddress    | sr25519::Public (unchecked [u8; 32] wrapper) |
+| Amount          | u64                                          |
+| NetworkId       | NetworkId (Rust enum, SCALE-encoded)         |
+| Coin            | Coin (Rust enum, SCALE-encoded)              |
+| Session         | u32                                          |
+| Validator Set   | (NetworkId, Session)                         |
+| Key             | BoundedVec\<u8, 96>                          |
+| KeyPair         | (SeraiAddress, Key)                          |
+| ExternalAddress | BoundedVec\<u8, 196>                         |
+| Data            | BoundedVec\<u8, 512>                         |
+
+### Networks
+
+Every network connected to Serai operates over a specific curve. The processor
+generates a distinct set of keys per network. Beyond the key-generation itself
+being isolated, the generated keys are further bound to their respective
+networks via an additive offset created by hashing the network's name (among
+other properties). The network's key is used for all coins on that network.
+
+| Network  | Curve     | ID |
+|----------|-----------|----|
+| Serai    | Ristretto | 0  |
+| Bitcoin  | Secp256k1 | 1  |
+| Ethereum | Secp256k1 | 2  |
+| Monero   | Ed25519   | 3  |
+
+### Coins
+
+Coins exist over a network and have a distinct integer ID.
+
+| Coin     | Network  | ID |
+|----------|----------|----|
+| Serai    | Serai    | 0  |
+| Bitcoin  | Bitcoin  | 1  |
+| Ether    | Ethereum | 2  |
+| DAI      | Ethereum | 3  |
+| Monero   | Monero   | 4  |