Make the round participants sign the vtxo tree (#271)

* [proto] add APIs to send and receive musig2 signing data

* [common] add serialization functions for nonces and signatures

* [application] implements tree signing

* fix: remove old debug logs

* [proto] cleaning

* [common] fix musig2.go

* [application] fixes and logs

* [interface] fix: stop forwarding 2 times the events

* [client] add musig2 support + sign the tree when joining a round

* [interface] add new APIs into permissions.go

* [application][proto] rework PingResponse (return all events type)

* [common] split SetKeys into 2 distinct methods

* [client] fixes according to musig2.go changes

* [sdk] support tree signing + new PingResponse

* [sdk] fixes

* [application] revert event channel type

* [application] use domain.RoundEvent as lastEvent type

* [application] remove IsCovenantLess

* comments

* [application] revert roundAborted changes

* [interface] remove bitcointree dependencie

api-spec/openapi/swagger/ark/v1/service.swagger.json

@@ -261,6 +261,70 @@
         ]
       }
     },
+    "/v1/payment/tree/nonces": {
+      "post": {
+        "operationId": "ArkService_SendTreeNonces",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1SendTreeNoncesResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1SendTreeNoncesRequest"
+            }
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
+    "/v1/payment/tree/signatures": {
+      "post": {
+        "operationId": "ArkService_SendTreeSignatures",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1SendTreeSignaturesResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1SendTreeSignaturesRequest"
+            }
+          }
+        ],
+        "tags": [
+          "ArkService"
+        ]
+      }
+    },
     "/v1/ping/{paymentId}": {
       "get": {
         "operationId": "ArkService_Ping",
@@ -323,7 +387,6 @@
     },
     "/v1/round/{txid}": {
       "get": {
-        "summary": "TODO BTC: signTree rpc",
         "operationId": "ArkService_GetRound",
         "responses": {
           "200": {
@@ -502,14 +565,19 @@
       "type": "object",
       "properties": {
         "roundFinalization": {
-          "$ref": "#/definitions/v1RoundFinalizationEvent",
-          "title": "TODO: BTC add \"signTree\" event"
+          "$ref": "#/definitions/v1RoundFinalizationEvent"
         },
         "roundFinalized": {
           "$ref": "#/definitions/v1RoundFinalizedEvent"
         },
         "roundFailed": {
           "$ref": "#/definitions/v1RoundFailed"
+        },
+        "roundSigning": {
+          "$ref": "#/definitions/v1RoundSigningEvent"
+        },
+        "roundSigningNoncesGenerated": {
+          "$ref": "#/definitions/v1RoundSigningNoncesGeneratedEvent"
         }
       }
     },
@@ -649,14 +717,20 @@
     "v1PingResponse": {
       "type": "object",
       "properties": {
-        "forfeitTxs": {
-          "type": "array",
-          "items": {
-            "type": "string"
-          }
-        },
-        "event": {
+        "roundFinalization": {
           "$ref": "#/definitions/v1RoundFinalizationEvent"
+        },
+        "roundFinalized": {
+          "$ref": "#/definitions/v1RoundFinalizedEvent"
+        },
+        "roundFailed": {
+          "$ref": "#/definitions/v1RoundFailed"
+        },
+        "roundSigning": {
+          "$ref": "#/definitions/v1RoundSigningEvent"
+        },
+        "roundSigningNoncesGenerated": {
+          "$ref": "#/definitions/v1RoundSigningNoncesGeneratedEvent"
         }
       }
     },
@@ -669,6 +743,9 @@
             "type": "object",
             "$ref": "#/definitions/v1Input"
           }
+        },
+        "ephemeralPubkey": {
+          "type": "string"
         }
       }
     },
@@ -766,6 +843,34 @@
         }
       }
     },
+    "v1RoundSigningEvent": {
+      "type": "object",
+      "properties": {
+        "id": {
+          "type": "string"
+        },
+        "cosignersPubkeys": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "unsignedTree": {
+          "$ref": "#/definitions/v1Tree"
+        }
+      }
+    },
+    "v1RoundSigningNoncesGeneratedEvent": {
+      "type": "object",
+      "properties": {
+        "id": {
+          "type": "string"
+        },
+        "treeNonces": {
+          "type": "string"
+        }
+      }
+    },
     "v1RoundStage": {
       "type": "string",
       "enum": [
@@ -777,6 +882,40 @@
       ],
       "default": "ROUND_STAGE_UNSPECIFIED"
     },
+    "v1SendTreeNoncesRequest": {
+      "type": "object",
+      "properties": {
+        "roundId": {
+          "type": "string"
+        },
+        "publicKey": {
+          "type": "string"
+        },
+        "treeNonces": {
+          "type": "string"
+        }
+      }
+    },
+    "v1SendTreeNoncesResponse": {
+      "type": "object"
+    },
+    "v1SendTreeSignaturesRequest": {
+      "type": "object",
+      "properties": {
+        "roundId": {
+          "type": "string"
+        },
+        "publicKey": {
+          "type": "string"
+        },
+        "treeSignatures": {
+          "type": "string"
+        }
+      }
+    },
+    "v1SendTreeSignaturesResponse": {
+      "type": "object"
+    },
     "v1Tree": {
       "type": "object",
       "properties": {