chore: Change precision of CoinJoin fee rate percentage from 8 to 6 decimal digits.

common/protob/messages-bitcoin.proto

@@ -204,7 +204,7 @@ message SignTx {
      * Signing request for a CoinJoin transaction.
      */
     message CoinJoinRequest {
-        required uint32 fee_rate = 1;                // coordination fee rate in units of 10^-8 percent
+        required uint32 fee_rate = 1;                // coordination fee rate in units of 10^-6 percent
         required uint64 no_fee_threshold = 2;        // PlebsDontPayThreshold in Wasabi, the input amount above which the fee rate applies
         required uint64 min_registrable_amount = 3;  // minimum registrable output amount
         required bytes mask_public_key = 4;          // ephemeral secp256k1 public key used for masking coinjoin_flags, 33 bytes in compressed form
@@ -615,7 +615,7 @@ message AuthorizeCoinJoin {
 
     required string coordinator = 1;                                    // coordinator identifier to approve as a prefix in commitment data (max. 36 ASCII characters)
     required uint64 max_rounds = 2;                                     // maximum number of rounds that Trezor is authorized to take part in
-    required uint32 max_coordinator_fee_rate = 3;                       // maximum coordination fee rate in units of 10^-8 percent
+    required uint32 max_coordinator_fee_rate = 3;                       // maximum coordination fee rate in units of 10^-6 percent
     required uint32 max_fee_per_kvbyte = 4;                             // maximum mining fee rate in units of satoshis per 1000 vbytes
     repeated uint32 address_n = 5;                                      // prefix of the BIP-32 path leading to the account (m / purpose' / coin_type' / account')
     optional string coin_name = 6 [default='Bitcoin'];                  // coin to use

core/src/apps/bitcoin/authorization.py

@@ -19,7 +19,7 @@ if TYPE_CHECKING:
 
     from apps.common.coininfo import CoinInfo
 
-FEE_RATE_DECIMALS = const(8)
+FEE_RATE_DECIMALS = const(6)
 
 
 class CoinJoinAuthorization:

tests/device_tests/bitcoin/payment_req.py

@@ -113,7 +113,7 @@ def make_coinjoin_request(
     outputs,
     output_script_pubkeys,
     no_fee_indices,
-    fee_rate=50_000_000,  # 0.5 %
+    fee_rate=500_000,  # 0.5 %
     no_fee_threshold=1_000_000,
     min_registrable_amount=5_000,
 ):

tests/device_tests/bitcoin/test_authorize_coinjoin.py

@@ -58,7 +58,7 @@ def test_sign_tx(client: Client):
             client,
             coordinator="www.example.com",
             max_rounds=2,
-            max_coordinator_fee_rate=50_000_000,  # 0.5 %
+            max_coordinator_fee_rate=500_000,  # 0.5 %
             max_fee_per_kvbyte=3500,
             n=parse_path("m/10025h/1h/0h/1h"),
             coin_name="Testnet",
@@ -268,7 +268,7 @@ def test_sign_tx_large(client: Client):
             client,
             coordinator="www.example.com",
             max_rounds=2,
-            max_coordinator_fee_rate=50_000_000,  # 0.5 %
+            max_coordinator_fee_rate=500_000,  # 0.5 %
             max_fee_per_kvbyte=3500,
             n=parse_path("m/10025h/1h/0h/1h"),
             coin_name="Testnet",
@@ -478,7 +478,7 @@ def test_wrong_coordinator(client: Client):
         client,
         coordinator="www.example.com",
         max_rounds=10,
-        max_coordinator_fee_rate=50_000_000,  # 0.5 %
+        max_coordinator_fee_rate=500_000,  # 0.5 %
         max_fee_per_kvbyte=3500,
         n=parse_path("m/10025h/1h/0h/1h"),
         coin_name="Testnet",
@@ -502,7 +502,7 @@ def test_wrong_account_type(client: Client):
         "client": client,
         "coordinator": "www.example.com",
         "max_rounds": 10,
-        "max_coordinator_fee_rate": 50_000_000,  # 0.5 %
+        "max_coordinator_fee_rate": 500_000,  # 0.5 %
         "max_fee_per_kvbyte": 3500,
         "coin_name": "Testnet",
     }
@@ -530,7 +530,7 @@ def test_cancel_authorization(client: Client):
         client,
         coordinator="www.example.com",
         max_rounds=10,
-        max_coordinator_fee_rate=50_000_000,  # 0.5 %
+        max_coordinator_fee_rate=500_000,  # 0.5 %
         max_fee_per_kvbyte=3500,
         n=parse_path("m/10025h/1h/0h/1h"),
         coin_name="Testnet",
@@ -693,7 +693,7 @@ def test_multisession_authorization(client: Client):
         client,
         coordinator="www.example1.com",
         max_rounds=10,
-        max_coordinator_fee_rate=50_000_000,  # 0.5 %
+        max_coordinator_fee_rate=500_000,  # 0.5 %
         max_fee_per_kvbyte=3500,
         n=parse_path("m/10025h/1h/0h/1h"),
         coin_name="Testnet",
@@ -709,7 +709,7 @@ def test_multisession_authorization(client: Client):
         client,
         coordinator="www.example2.com",
         max_rounds=10,
-        max_coordinator_fee_rate=50_000_000,  # 0.5 %
+        max_coordinator_fee_rate=500_000,  # 0.5 %
         max_fee_per_kvbyte=3500,
         n=parse_path("m/10025h/1h/0h/1h"),
         coin_name="Testnet",

tests/device_tests/test_msg_applysettings.py

@@ -230,7 +230,7 @@ def test_experimental_features(client: Client):
             client,
             coordinator="www.example.com",
             max_rounds=10,
-            max_coordinator_fee_rate=50_000_000,  # 0.5 %
+            max_coordinator_fee_rate=500_000,  # 0.5 %
             max_fee_per_kvbyte=3500,
             n=parse_path("m/10025h/1h/0h/1h"),
             coin_name="Testnet",