[Wallet/mint] P2PK with timelocks (#270)

* p2pk with nostr privatekey and timelocks

* add p2pk

* fix test

* fix test with custom secret

* sign whole split transaction

* p2pk signature now commits to entire secret and thus to a nonce

* use schnorr signatures

* revamp P2SH and P2PK with new Secret model

* test p2pk

* add comments

* add nostr private key to tests

* fix nostr receive

* make format

* test redemption after timelock

* refactor Server.serialize()

* sign sha256(secret)

* add optional refund pubkey that triggers after timelock

* use nostr private key for now (including nsec parser)

* use nostr private key and fix tests

* bump version to 0.12.2

cashu/core/settings.py

@@ -8,7 +8,7 @@ from pydantic import BaseSettings, Extra, Field
 
 env = Env()
 
-VERSION = "0.12.1"
+VERSION = "0.12.2"
 
 
 def find_env_file():
@@ -98,9 +98,15 @@ class WalletSettings(CashuSettings):
         ]
     )
 
+    timelock_delta_seconds: int = Field(default=86400)  # 1 day
+
 
 class Settings(
-    EnvSettings, MintSettings, MintInformation, WalletSettings, CashuSettings
+    EnvSettings,
+    MintSettings,
+    MintInformation,
+    WalletSettings,
+    CashuSettings,
 ):
     version: str = Field(default=VERSION)