diff --git a/.gitignore b/.gitignore
index 09dd1da..10b5b15 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 venv/*
+mine_data/*
+mariadb_data/*
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..8798a81
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,6 @@
+FROM ericomeehan/httpd-mod-wsgi
+RUN apt update && apt upgrade -y
+RUN apt install -y libmariadb3 libmariadb-dev python3-dev python3-pip
+COPY . /usr/local/apache2/htdocs
+RUN pip3 install --break-system-packages -r /usr/local/apache2/htdocs/requirements.txt
+EXPOSE 80
diff --git a/db/createMarketDatabase.sql b/db-old/createDatabase.sql
similarity index 68%
rename from db/createMarketDatabase.sql
rename to db-old/createDatabase.sql
index 16d7337..0230207 100644
--- a/db/createMarketDatabase.sql
+++ b/db-old/createDatabase.sql
@@ -1,7 +1,7 @@
 CREATE DATABASE IF NOT EXISTS market;
 USE market;
 CREATE TABLE IF NOT EXISTS users(
-    sqlId INT PRIMARY KEY AUTO INCREMENT,
+    sqlId INT PRIMARY KEY AUTO_INCREMENT,
     userId VARCHAR(36) UNIQUE NOT NULL,
     userName VARCHAR(64) UNIQUE NOT NULL,
     passwordHash VARCHAR(64) NOT NULL,
@@ -10,7 +10,7 @@ CREATE TABLE IF NOT EXISTS users(
     publicKey VARCHAR(128) NOT NULL
 );
 CREATE TABLE IF NOT EXISTS buy_orders(
-    sqlId INT PRIMARY KEY AUTO INCREMENT,
+    sqlId INT PRIMARY KEY AUTO_INCREMENT,
     buyOrderId VARCHAR(36) UNIQUE NOT NULL,
     timestamp DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP(),
     expires DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP() + INTERVAL 3 DAY,
@@ -22,7 +22,7 @@ CREATE TABLE IF NOT EXISTS buy_orders(
     FOREIGN KEY (userId) REFERENCES users(userId)
 );
 CREATE TABLE IF NOT EXISTS sell_orders(
-    sqlId INT PRIMARY KEY AUTO INCREMENT,
+    sqlId INT PRIMARY KEY AUTO_INCREMENT,
     sellOrderId VARCHAR(36) UNIQUE NOT NULL,
     timestamp DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP(),
     expires DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP() + INTERVAL 3 DAY,
@@ -31,15 +31,21 @@ CREATE TABLE IF NOT EXISTS sell_orders(
     FOREIGN KEY (userId) REFERENCES users(userId)
 );
 CREATE TABLE IF NOT EXISTS sell_orders_items(
-    sqlId INT PRIMARY KEY AUTO INCREMENT,
+    sqlId INT PRIMARY KEY AUTO_INCREMENT,
     cardId VARCHAR(36) NOT NULL,
     FOREIGN KEY (sellOrderId) REFERENCES sell_orders(sellOrderId) NOT NULL
 );
 CREATE TABLE IF NOT EXISTS transactions(
-    sqlId INT PRIMARY KEY AUTO INCREMENT,
+    sqlId INT PRIMARY KEY AUTO_INCREMENT,
     transactionId VARCHAR(36) UNIQUE NOT NULL,
     isPending BOOLEAN NOT NULL DEFAULT true,
     isAbandoned BOOLEAN NOT NULL DEFAULT false,
     FOREIGN KEY (buyOrderId) REFERENCES buy_orders(buyOrderId) NOT NULL,
     FOREIGN KEY (sellOrderItemSqlId) REFERENCES sell_order_items(sqlId) NOT NULL
 );
+CREATE USER IF NOT EXISTS '${MARKET_DB_USER}'@'%' IDENTIFIED BY '${MARKET_DB_PASSWORD}';
+CREATE USER IF NOT EXISTS '${ORDER_MATCHER_DB_USER}'@'%' IDENTIFIED BY '${ORDER_MATCHER_DB_PASSWORD}';
+CREATE USER IF NOT EXISTS '${STATUS_CHECKER_DB_USER}'@'%' IDENTIFIED BY '${STATUS_CHECKER_DB_PASSWORD}';
+GRANT ALL PRIVILEGES ON market.* TO '${MARKET_DB_USER}'@'%';
+GRANT ALL PRIVILEGES ON market.* TO '${ORDER_MATCHER_DB_USER}'@'%';
+GRANT ALL PRIVILEGES ON market.* TO '${STATUS_CHECKER_DB_USER}'@'%';
diff --git a/db/getBuyOrders.sql b/db-old/getBuyOrders.sql
similarity index 100%
rename from db/getBuyOrders.sql
rename to db-old/getBuyOrders.sql
diff --git a/db/getDeck.sql b/db-old/getDeck.sql
similarity index 100%
rename from db/getDeck.sql
rename to db-old/getDeck.sql
diff --git a/db/getLastTransactionForCard.sql b/db-old/getLastTransactionForCard.sql
similarity index 100%
rename from db/getLastTransactionForCard.sql
rename to db-old/getLastTransactionForCard.sql
diff --git a/db/getSellOrders.sql b/db-old/getSellOrders.sql
similarity index 100%
rename from db/getSellOrders.sql
rename to db-old/getSellOrders.sql
diff --git a/db/createChainDatabase.sql b/db/createMineDatabase.sql
similarity index 79%
rename from db/createChainDatabase.sql
rename to db/createMineDatabase.sql
index 70265ba..09d30a8 100644
--- a/db/createChainDatabase.sql
+++ b/db/createMineDatabase.sql
@@ -1,7 +1,5 @@
-CREATE DATABASE IF NOT EXISTS chain;
-USE chain;
 CREATE TABLE IF NOT EXISTS blocks(
-    sqlId INT PRIMARY KEY AUTO INCREMENT,
+    sqlId INT PRIMARY KEY AUTO_INCREMENT,
     blockId VARCHAR(32) UNIQUE NOT NULL,
     blockHash VARCHAR(64) UNIQUE NOT NULL,
     previousHash VARCHAR(64) UNIQUE NOT NULL,
@@ -10,13 +8,16 @@ CREATE TABLE IF NOT EXISTS blocks(
     nonce INT NOT NULL
 );
 CREATE TABLE IF NOT EXISTS cards(
-    sqlId INT PRIMARY KEY AUTO INCREMENT,
+    sqlId INT PRIMARY KEY AUTO_INCREMENT,
+    blockId VARCHAR(32) UNIQUE NOT NULL,
     cardId VARCHAR(32) UNIQUE NOT NULL,
     pageId INT NOT NULL,
     FOREIGN KEY (blockId) REFERENCES blocks(blockId)
 );
 CREATE TABLE IF NOT EXISTS transactions(
-    sqlId INT PRIMARY KEY AUTO INCREMENT,
+    sqlId INT PRIMARY KEY AUTO_INCREMENT,
+    blockId VARCHAR(32) NOT NULL,
+    cardId VARCHAR(32) UNIQUE NOT NULL,
     transactionId VARCHAR(32) UNIQUE NOT NULL,
     timestamp DATETIME NOT NULL,
     sender VARCHAR(128) NOT NULL,
@@ -28,7 +29,7 @@ CREATE TABLE IF NOT EXISTS transactions(
     FOREIGN KEY (cardId) REFERENCES cards(cardId)
 );
 CREATE TABLE IF NOT EXISTS peers(
-    sqlId INT PRIMARY KEY AUTO INCREMENT,
+    sqlId INT PRIMARY KEY AUTO_INCREMENT,
     peerId VARCHAR(32) UNIQUE NOT NULL,
     baseUrl VARCHAR(128) UNIQUE NOT NULL,
     isUp BOOLEAN NOT NULL,
diff --git a/db/createPeersDatabase.sql b/db/createPeersDatabase.sql
deleted file mode 100644
index be04f5b..0000000
--- a/db/createPeersDatabase.sql
+++ /dev/null
@@ -1,3 +0,0 @@
-CREATE DATABASE IF NOT EXISTS peers;
-USE peers;
-CREATE TABLE IF NOT EXISTS peers
diff --git a/docker-compose.yaml b/docker-compose.yaml
new file mode 100644
index 0000000..1928219
--- /dev/null
+++ b/docker-compose.yaml
@@ -0,0 +1,34 @@
+version: '3.8'
+
+services:
+  wikideck:
+    image: ericomeehan/wikideck:latest
+    build:
+      context: .
+      dockerfile: Dockerfile
+    environment:
+      ROLE: api
+      DATA_PATH: /data
+      DIFFICULTY_REQUIREMENT: 3
+      MINE_DB_HOST: mariadb-mine
+      MINE_DB_USER: mine
+      MINE_DB_PASSWORD: 123abc
+    depends_on:
+      - mariadb-mine
+    ports:
+      - "8080:80"
+    volumes:
+      - ./mine_data:/data
+
+  mariadb-mine:
+    image: mariadb:latest
+    environment:
+      MARIADB_ROOT_PASSWORD: abc123
+      MARIADB_DATABASE: mine
+      MARIADB_USER: mine
+      MARIADB_PASSWORD: 123abc
+    ports:
+      - "3306:3306"
+
+volumes:
+  mine_data:
diff --git a/requirements.txt b/requirements.txt
index e2589d2..0732ec3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,5 @@
+cryptography
+dotenv
+flask
+mariadb
 wikipedia
diff --git a/wikideck/Mine/Block.py b/wikideck/Mine/Block.py
index 9219e33..744e51c 100644
--- a/wikideck/Mine/Block.py
+++ b/wikideck/Mine/Block.py
@@ -1,33 +1,40 @@
-from card import Card
-
 import datetime
 import hashlib
+import json
+import uuid
+
+from Mine.Card import Card
+from Mine.Transaction import Transaction
 
 class Block():
-    def __init__(self, blockId=uuid.uuid4(), previousHash=None,
+    def __init__(self, blockId=uuid.uuid4(), previousHash="0",
                  timestamp=datetime.datetime.now(datetime.timezone.utc), height=0, nonce=0,
-                 card=Card(), transactions=[], authorPublicKey=None, data=None):
-        self.blockId = blockId
-        self.previousHash = previousHash
-        self.timestamp = timestamp
-        self.height = height
-        self.difficulty = difficulty
-        self.nonce = nonce
-        self.card = card
-        self.transactions = transactions.append(
-            Transaction(
-                cardId = self.card.id,
-                receiver = authorPublicKey
-                )
-            )
+                 difficulty=0, card=Card(), transactions=[], data=None):
         if data:
             self.load_from_data(data)
+        else:
+            self.blockId = blockId
+            self.previousHash = previousHash
+            self.timestamp = timestamp
+            self.height = height
+            self.difficulty = difficulty
+            self.nonce = nonce
+            self.card = card
+            self.transactions = transactions
         self.update()
 
     def update(self):
         self.blockHash = hashlib.sha256(str(self).encode('utf-8'))
 
-    def mine(self):
+    def mine(self, authorPrivateKey):
+        self.transactions.append(
+            Transaction(
+                cardId = self.card.cardId,
+                sender = authorPrivateKey.public_key(),
+                receiver = authorPrivateKey.public_key(),
+                authorPrivateKey = authorPrivateKey
+                )
+            )
         while int(self.blockHash.hexdigest(), 16) > 2**(256-self.difficulty):
             self.nonce += 1
             self.update()
@@ -43,20 +50,21 @@ class Block():
     def validate(self):
         # TODO: validate blockId is uuid
         # TODO: validate previousHash is sha256 hash
-        if not int(self.blockHash.hexdigest(), 16) > 2**(256-self.difficulty):
+        if not int(self.blockHash.hexdigest(), 16) <= 2**(256-self.difficulty):
             raise self.Invalid("Hash does not meet difficulty requirement.")
-        # TODO: validate timestamp is timestamp
-        if not self.timestamp < datetime.datetime.now():
+        # TODO: validate timestamp is UTC timestamp
+        if not self.timestamp < datetime.datetime.now(datetime.timezone.utc):
             raise self.Invalid("Timestamp in the future.")
-        if not self.height > 0:
+        if not self.height >= 0:
             raise self.Invalid("Height less than 0.")
-        if not self.difficulty > 0:
+        if not self.difficulty >= 0:
             raise self.Invalid("Difficulty less than 0.")
-        if not self.nonce > 0:
+        if not self.nonce >= 0:
             raise self.Invalid("Nonce less than 0.")
         self.card.validate()
         for transaction in self.transactions:
             transaction.validate()
+        # TODO validate that one transaction gives the card to the author
 
     def load_from_data(self, data):
         self.blockId = uuid.UUID(data['blockId'])
@@ -87,21 +95,24 @@ class Block():
             ]
         self.update()
 
-    def __str__(self):
-        # The hash of the block is the SHA256 hash of what this method returns.
-        return data.dumps({
-            "blockId": str(self.blockId)
+    def as_dict(self):
+        return {
+            "blockId": str(self.blockId),
             "previousHash": self.previousHash,
-            "timestamp": str(self.timestamp)
+            "timestamp": str(self.timestamp),
             "height": self.height,
             "difficulty": self.difficulty,
             "nonce": self.nonce,
-            "author": self.author,
-            "card": str(self.card),
-            "transactions": [str(each) for each in transactions]
-            })
+            "card": self.card.as_dict(),
+            "transactions": [each.as_dict() for each in self.transactions]
+            }
+
+
+    def __str__(self):
+        # The hash of the block is the SHA256 hash of what this method returns.
+        return json.dumps(self.as_dict())
 
     class Invalid(Exception):
-        def __init__(message, status_code=406):
+        def __init__(self, message, status_code=406):
             super().__init__(message)
             self.status_code = status_code
diff --git a/wikideck/Mine/Card.py b/wikideck/Mine/Card.py
index 374e580..ffb2ac9 100644
--- a/wikideck/Mine/Card.py
+++ b/wikideck/Mine/Card.py
@@ -1,12 +1,25 @@
 import requests
+import json
 import wikipedia
 import uuid
 
 class Card():
-    def __init__(self, cardId=uuid.uuid4(),
-                 pageId=wikipedia.page(wikipedia.random()).pageid, data=None):
+    def __init__(self, cardId=uuid.uuid4(), pageId=None, data=None):
         self.cardId = cardId
-        self.pageId = pageId
+        while True:
+            try:
+                self.pageId = pageId if pageId else int(
+                    wikipedia.page(
+                        wikipedia.random()
+                        ).pageid
+                    )
+            except wikipedia.exceptions.PageError as e:
+                # TODO: why is the random function returning lower-case pages?
+                continue
+            except wikipedia.exceptions.DisambiguationError as e:
+                # TODO pick random disambiuation option
+                continue
+            break
         if data:
             self.load_from_data(data)
 
@@ -21,11 +34,14 @@ class Card():
         self.cardId = uuid.UUID(data['cardId'])
         self.pageId = data['pageId']
 
-    def __str__(self):
-        return json.dumps({
+    def as_dict(self):
+        return {
             "cardId": str(self.cardId),
             "pageId": self.pageId
-            })
+            }
+
+    def __str__(self):
+        return json.dumps(self.as_dict())
 
     class Invalid(Exception):
         def __init__(self, message, status_code=406):
diff --git a/wikideck/Mine/Database.py b/wikideck/Mine/Database.py
index 39a0d74..3013a5d 100644
--- a/wikideck/Mine/Database.py
+++ b/wikideck/Mine/Database.py
@@ -1,107 +1,186 @@
+import mariadb
+import os
+import time
+
+from Mine.Block import Block
+from Mine.Transaction import Transaction
+
 class Database():
+    SQL_CREATE_DATABASE = [
+        """
+        CREATE TABLE IF NOT EXISTS mine.blocks(
+            sqlId INT PRIMARY KEY AUTO_INCREMENT,
+            blockId VARCHAR(37) UNIQUE NOT NULL,
+            blockHash VARCHAR(64) UNIQUE NOT NULL,
+            previousHash VARCHAR(64) UNIQUE NOT NULL,
+            timestamp DATETIME NOT NULL,
+            height INT UNIQUE NOT NULL,
+            nonce INT NOT NULL
+        );
+        """,
+        """
+        CREATE TABLE IF NOT EXISTS mine.cards(
+            sqlId INT PRIMARY KEY AUTO_INCREMENT,
+            blockId VARCHAR(37) UNIQUE NOT NULL,
+            cardId VARCHAR(37) UNIQUE NOT NULL,
+            pageId INT NOT NULL,
+            FOREIGN KEY (blockId) REFERENCES blocks(blockId)
+        );
+        """,
+        """
+        CREATE TABLE IF NOT EXISTS mine.transactions(
+            sqlId INT PRIMARY KEY AUTO_INCREMENT,
+            blockId VARCHAR(37) NOT NULL,
+            cardId VARCHAR(37) UNIQUE NOT NULL,
+            transactionId VARCHAR(37) UNIQUE NOT NULL,
+            timestamp DATETIME NOT NULL,
+            sender VARCHAR(128) NOT NULL,
+            receiver VARCHAR(128) NOT NULL,
+            signature VARCHAR(128) NOT NULL,
+            isPending BOOLEAN NOT NULL DEFAULT true,
+            isAbandoned BOOLEAN NOT NULL DEFAULT false,
+            FOREIGN KEY (blockId) REFERENCES blocks(blockId),
+            FOREIGN KEY (cardId) REFERENCES cards(cardId)
+        );
+        """,
+        """
+        CREATE TABLE IF NOT EXISTS mine.peers(
+            sqlId INT PRIMARY KEY AUTO_INCREMENT,
+            peerId VARCHAR(37) UNIQUE NOT NULL,
+            baseUrl VARCHAR(128) UNIQUE NOT NULL,
+            isUp BOOLEAN NOT NULL,
+            downCount INT DEFAULT 0,
+            lastTry TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+        );
+        """
+        ]
+
+    SQL_GET_BLOCK_BY_ID = """
+        SELECT *
+        FROM blocks
+        WHERE blockId = '{}';
+        """
+
     SQL_GET_LAST_BLOCK = """
-    SELECT *
-    FROM blocks
-    ORDER BY timestamp DESC
-    LIMIT 1;
-    """
+        SELECT *
+        FROM blocks
+        ORDER BY timestamp DESC
+        LIMIT 1;
+        """
 
     SQL_GET_CARD = """
-    SELECT *
-    FROM cards
-    WHERE cardId == {};
-    """
+        SELECT *
+        FROM cards
+        WHERE cardId = '{}';
+        """
 
     SQL_GET_CARD_OWNER = """
-    SELECT receiver
-    FROM transactions
-    WHERE cardId == {}
-    AND isPending == false
-    ORDER BY timestamp DESC
-    LIMIT 1;
-    """
+        SELECT receiver
+        FROM transactions
+        WHERE cardId = '{}'
+        AND isPending = False
+        ORDER BY timestamp DESC
+        LIMIT 1;
+        """
 
     SQL_GET_PENDING_TRANSACTIONS = """
-    SELECT *
-    FROM transactions
-    WHERE isPending == true;
-    """
+        SELECT *
+        FROM transactions
+        WHERE isPending = True
+        ORDER BY timestamp ASC
+        LIMIT {};
+        """
 
-    SQL_GET_TRANSACTION = """
-    SELECT *
-    FROM transactions
-    WHERE transactionId == {}
-    """
+    SQL_GET_TRANSACTION_BY_ID = """
+        SELECT *
+        FROM transactions
+        WHERE transactionId == '{}'
+        """
 
     SQL_INSERT_BLOCK = """
-    INSERT INTO blocks (blockId, blockHash, previousHash, timestamp, height, nonce)
-    VALUES ({}, {}, {}, {}, {}, {});
-    """
+        INSERT INTO blocks (blockId, blockHash, previousHash, timestamp, height, nonce)
+        VALUES ('{}', '{}', '{}', '{}', {}, {});
+        """
 
     SQL_INSERT_TRANSACTION = """
-    INSERT INTO transactions (
-        transactionId,
-        timestamp,
-        sender,
-        receiver,
-        signature,
-        blockId,
-        cardId
-        )
-    VALUES ({}, {}, {}, {}, {});
-    """
+        INSERT INTO transactions (
+            transactionId,
+            timestamp,
+            sender,
+            receiver,
+            signature,
+            blockId,
+            cardId
+            )
+        VALUES ({}, {}, {}, {}, {});
+        """
 
-    def __init__(self, host, port, user, password):
-        self.host = host
-        self.port = port
-        self.user = user
-        self.password = password
-        self.conn = mariadb.connect(
-            host = self.host,
-            port = self.port,
-            user = self.user,
-            password = self.password
+    def __init__(self):
+        delay = 2
+        while True:
+            try:
+                self.conn = mariadb.connect(
+                    host = os.getenv('MINE_DB_HOST', "mariadb"),
+                    port = os.getenv('MINE_DB_PORT', 3306),
+                    user = os.getenv('MINE_DB_USER', None),
+                    password = os.getenv('MINE_DB_PASSWORD', None),
+                    database = 'mine'
+                    )
+                for each in self.SQL_CREATE_DATABASE:
+                    cursor = self.conn.cursor().execute(each)
+            except mariadb.Error as e:
+                time.sleep(delay := delay**2)
+                continue
+            break
+
+    def get_block_by_id(self, blockId):
+        return Block(
+            data=self.conn.cursor().execute(
+                self.SQL_GET_BLOCK_BY_ID.format(blockId)
+                )
             )
 
     def get_last_block(self):
-        return Block(
-            data=self.conn.cursor().execute(SQL_GET_LAST_BLOCK)[0]
-            )
+        data=self.conn.cursor().execute(self.SQL_GET_LAST_BLOCK)
+        return Block(data=data) if data else None
 
     def get_card(self, cardId):
         return Card(
-            data=self.conn.cursor().execute(SQL_GET_CARD.format(cardId))[0]
+            data=self.conn.cursor().execute(self.SQL_GET_CARD.format(cardId))
             )
 
     def get_card_owner(self, cardId):
         return self.conn.cursor().execute(
-            SQL_GET_CARD_OWNER.format(cardId)
-            )[0]
+            self.SQL_GET_CARD_OWNER.format(cardId)
+            )
 
-    def get_pending_transactions(self):
+    def get_pending_transactions(self, limit=32768):
+        pendingTransactions = self.conn.cursor().execute(
+            self.SQL_GET_PENDING_TRANSACTIONS.format(limit)
+            )
         return [
             Transaction(
                 data=each
-                ) for each in self.conn.cursor().execute(SQL_GET_PENDING_TRANSACTIONS)
-            ]
+                ) for each in pendingTransactions
+            ] if pendingTransactions else []
 
     def get_transaction(self, transactionId):
         return Transaction(
-            data=self.conn.cursor().execute(SQL_GET_TRANSACTION.format(transactionId))
+            data=self.conn.cursor().execute(self.SQL_GET_TRANSACTION.format(transactionId))
             )
 
     def insert_block(self, block):
-        return self.conn.cursor().execute(SQL_INSERT_BLOCK.format(
+        self.conn.cursor().execute(self.SQL_INSERT_BLOCK.format(
             str(block.blockId),
             block.blockHash.hexdigest(),
-            block.previousHash.hexdigest(),
+            block.previousHash,
             str(block.timestamp),
             block.height,
             block.nonce
             ))
 
     def insert_transaction(self, transaction):
-        return self.conn.cursor().execute(SQL_INSERT_TRANSACTION.format(
+        return self.conn.cursor().execute(self.SQL_INSERT_TRANSACTION.format(
             str(transaction.transactionId),
             str(transaction.timestamp),
             transaction.sender,
diff --git a/wikideck/Mine/Mine.py b/wikideck/Mine/Mine.py
index 20c6364..d56a4d2 100644
--- a/wikideck/Mine/Mine.py
+++ b/wikideck/Mine/Mine.py
@@ -1,24 +1,75 @@
 import flask
 import json
+import os
 
+from cryptography.hazmat.primitives.asymmetric import rsa
+
+from Mine.Block import Block
+from Mine.Card import Card
 from Mine.Database import Database
+from Mine.Transaction import Transaction
+
+BLOCK_TRANSACTION_LIMIT = int(os.getenv('BLOCK_TRANSACTION_LIMIT', 32768))
+DATA_PATH = os.getenv('DATA_PATH', '/var/lib/wikideck/blocks')
+DIFFICULTY_REQUIREMENT = int(os.getenv('DIFFICULTY_REQUIREMENT', 0))
 
 mine = flask.Blueprint("mine", __name__)
 db = Database()
+privateKey = rsa.generate_private_key(
+    public_exponent=65537,
+    key_size=4096
+    )
 
-@app.get('/')
-def mine():
+def save_block(block):
+    with open(f"{DATA_PATH}/{block.blockId}.json", 'w') as f:
+        f.write(str(block)) # Blocks are json strings.  This is the true block.
+    db.insert_block(block)
+
+if not db.get_last_block():
+    # TODO: load blocks from files
+    # TODO: try to get blocks from peers
+    originBlock = Block(
+        difficulty = DIFFICULTY_REQUIREMENT,
+        )
+    originBlock.mine(privateKey)
+    originBlock.validate()
+    save_block(originBlock)
+
+@mine.get('/')
+def index_get():
     # TODO: return a page to mine through the browser
-    return 200
+    return "Hello world!", 200
+
+###
+# Retrieve blocks and block data.
+# Returns a skeleton block to be mined by default.
+# Queries for a specific block when given parameters.
+###
+@mine.get('/blocks')
+def blocks_get():
+    # TODO: block queries
+    blockId = flask.request.args.get('blockId', None)
+    lastBlock = db.get_last_block()
+    return flask.jsonify(
+        Block(
+            previousHash = lastBlock.blockHash.hexdigest(),
+            height = lastBlock.height + 1,
+            difficulty = DIFFICULTY_REQUIREMENT,
+            transactions = [
+                Transaction(data=each) for each in db.get_pending_transactions(
+                    BLOCK_TRANSACTION_LIMIT
+                    )
+                ]
+            ).as_dict()
+        )
 
 ###
 # Submit a block to the chain.
 # This method calls the Block().validate() method to validate the block schema.
 # This method performs additional validations against the rest of the chain.
 ###
-@app.post('/blocks')
+@mine.post('/blocks')
 def blocks_post():
-    previousBlock = get_last_block()
     try:
         newBlock = Block(data=request.get_json())
         newBlock.validate()
@@ -35,7 +86,7 @@ def blocks_post():
             raise Block.Invalid(
                 f"Incorrect block height - should be {previousBlock.height + 1}."
                 )
-        if newBlock.difficulty != DIFFICULTY_REQUIREMENT:
+        if newBlock.difficulty < DIFFICULTY_REQUIREMENT:
             raise Block.Invalid(
                 f"Incorrect difficulty - should be {DIFFICULTY_REQUIREMENT}."
                 )
@@ -73,46 +124,24 @@ def blocks_post():
                 raise Transaction.Invalid(
                     f"Incorrect signature on {transaction.transactionId}."
                     )
-        db.insert_block(block)
-        with open(f"{DATA_PATH}/{newBlock.blockId}.json", 'w') as f:
-            f.write(str(newBlock))
-        # TODO: update transactions
+        save_block(block)
+        for transaction in newBlock.transactions:
+            db.update_transactions_is_pending_false(transaction.transactionId)
         # TODO: update peers
-        return str(newBlock), 200
-    except: Transaction.Invalid as e:
+        return flask.jsonify(block.asDict())
+    except Transaction.Invalid as e:
         return e, e.statusCode
-    except: Transaction.AlreadyFulfilled as e:
+    except Transaction.AlreadyFulfilled as e:
         return e, e.statusCode
-    except: Card.Invalid as e:
+    except Card.Invalid as e:
         return e, e.statusCode
-    except: Block.Invalid as e:
+    except Block.Invalid as e:
         return e, e.statusCode
 
-###
-# Retrieve blocks and block data.
-# Returns a skeleton block to be mined by default.
-# Queries for a specific block when given parameters.
-###
-@app.get('/blocks')
-def blocks_get():
-    blockHash = request.args.get('blockHash', None)
-    height = request.args.get('height', None)
-    # TODO: block queries
-    return str(
-        Block(
-            previousHash = lastBlock.blockHash,
-            height = lastBlock.height + 1,
-            difficulty = DIFFICULTY_REQUIREMENT,
-            transactions = [
-                Transaction(data=each) for each in db.get_pending_transactions()
-                ]
-            )
-        )
-
 ###
 # Retrieve card data
 ###
-@app.get('/cards')
+@mine.get('/cards')
 def cards_get():
     # TODO: render cards in html
     # TODO: query cards
@@ -124,7 +153,7 @@ def cards_get():
 # This method performs a number of validations on the submitted transaction and returns
 # a status code result.
 ###
-@app.put('/transactions')
+@mine.put('/transactions')
 def transactions_put():
     try:
         newTransaction = Transaction(data=request.get_json())
@@ -151,20 +180,25 @@ def transactions_put():
 ###
 # Retrieve a transaction.
 ###
-@app.get('/transactions')
+@mine.get('/transactions')
 def transactions_get():
     transactionId = request.args.get('transactionId', None)
     return get_transaction_by_id(transactionId) if transactionId else json.dumps(
         db.get_pending_transactions()
         )
 
-@app.post('/peers')
+@mine.post('/peers')
 def peers_post():
-    # TODO: validate peer
-    # TODO: add peers to database
-    return 200
+    try:
+        peer = Peer(data=request.get_json())
+        peer.validate()
+        # TODO: add peers to database
+        return 200
+    # TODO: error handling
+    except Exception as e:
+        print('crap!')
 
-@app.get('/peers')
+@mine.get('/peers')
 def peers_get():
     # TODO: query peers
     return 200
diff --git a/wikideck/Mine/Transaction.py b/wikideck/Mine/Transaction.py
index a60c69b..cab0511 100644
--- a/wikideck/Mine/Transaction.py
+++ b/wikideck/Mine/Transaction.py
@@ -1,11 +1,17 @@
 import datetime
-import data
+import io
+import json
 import uuid
 
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.primitives import serialization
+from cryptography.hazmat.primitives.asymmetric import padding
+
 class Transaction():
     def __init__(self, transactionId=uuid.uuid4(),
                  timestamp=datetime.datetime.now(datetime.timezone.utc),
-                 cardId=None, sender=None, receiver=None, signature=None, data=None):
+                 cardId=None, sender=None, receiver=None, authorPrivateKey=None, signature=None,
+                 data=None):
         self.transactionId = transactionId
         self.timestamp = timestamp
         self.cardId = cardId
@@ -14,6 +20,8 @@ class Transaction():
         self.signature = signature
         if data:
             self.load_from_data(data)
+        if authorPrivateKey:
+            self.sign(authorPrivateKey)
 
     def validate(self):
         # TODO: validate transactionId
@@ -22,12 +30,48 @@ class Transaction():
         # TODO: validate sender
         # TODO: validate receiver
         # TODO: validate signature
-        if False:
-            raise self.Unauthorized("Failed signature check.")
+        try:
+            self.sender.verify(
+                self.signature,
+                bytearray(
+                    json.dumps({
+                        "transactionId": str(self.transactionId),
+                        "timestamp": str(self.timestamp),
+                        "cardId": str(self.cardId),
+                        "receiver": self.receiver.public_bytes(
+                            encoding=serialization.Encoding.PEM,
+                            format=serialization.PublicFormat.SubjectPublicKeyInfo
+                            ).decode('utf-8')
+                        }).encode('utf-8')
+                    ),
+                padding.PSS(
+                    mgf=padding.MGF1(hashes.SHA256()),
+                    salt_length=padding.PSS.MAX_LENGTH
+                    ),
+                hashes.SHA256()
+                )
+        except Exception as e:
+            raise self.InvalidSignature("Invalid signature.")
 
-    def sign(self, privateKey):
-        # TODO: use rsa private key to sign block
-        return None
+    def sign(self, authorPrivateKey):
+        self.signature = authorPrivateKey.sign(
+            bytearray(
+                json.dumps({
+                    "transactionId": str(self.transactionId),
+                    "timestamp": str(self.timestamp),
+                    "cardId": str(self.cardId),
+                    "receiver": self.receiver.public_bytes(
+                        encoding=serialization.Encoding.PEM,
+                        format=serialization.PublicFormat.SubjectPublicKeyInfo
+                        ).decode('utf-8')
+                    }).encode('utf-8')
+                ),
+            padding.PSS(
+                mgf=padding.MGF1(hashes.SHA256()),
+                salt_length=padding.PSS.MAX_LENGTH
+                ),
+            hashes.SHA256()
+            )
 
     def load_from_data(self, data):
         self.transactionId = uuid.UUID(data['transactionId'])
@@ -36,20 +80,29 @@ class Transaction():
             "%Y-%m-%d %H:%M:%S.%f%z"
             )
         self.cardId = uuid.UUID(data['cardId'])
+        # TODO: load rsa keys
         self.sender = data['sender']
         self.receiver = data['receiver']
         self.signature = data['signature']
 
+    def as_dict(self):
+        return {
+            "transactionId": str(self.transactionId),
+            "timestamp": str(self.timestamp),
+            "cardId": str(self.cardId),
+            "receiver": self.receiver.public_bytes(
+                encoding=serialization.Encoding.PEM,
+                format=serialization.PublicFormat.SubjectPublicKeyInfo
+                ).decode('utf-8'),
+            "sender": self.sender.public_bytes(
+                encoding=serialization.Encoding.PEM,
+                format=serialization.PublicFormat.SubjectPublicKeyInfo
+                ).decode('utf-8'),
+            "signature": self.signature.hex()
+            }
 
     def __str__(self):
-        return data.dumps({
-            "transactionId": str(self.id),
-            "timestamp": str(self.timestamp),
-            "cardId": self.cardId,
-            "sender": self.sender,
-            "receiver": self.receiver,
-            "signature": self.signature
-            })
+        return json.dumps(self.as_dict())
 
     class Unauthorized(Exception):
         def __init__(self, message, statusCode=403):
@@ -70,3 +123,8 @@ class Transaction():
         def __init__(self, message, statusCode=500):
             super().__init__(message)
             self.statusCode = statusCode
+
+    class InvalidSignature(Exception):
+        def __init__(self, message, statusCode=400):
+            super().__init__(message)
+            self.statusCode = statusCode
diff --git a/wikideck/Mine/__pycache__/Block.cpython-311.pyc b/wikideck/Mine/__pycache__/Block.cpython-311.pyc
new file mode 100644
index 0000000..f39ee83
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diff --git a/wikideck/Mine/__pycache__/Card.cpython-311.pyc b/wikideck/Mine/__pycache__/Card.cpython-311.pyc
new file mode 100644
index 0000000..17865fb
Binary files /dev/null and b/wikideck/Mine/__pycache__/Card.cpython-311.pyc differ
diff --git a/wikideck/Mine/__pycache__/Database.cpython-311.pyc b/wikideck/Mine/__pycache__/Database.cpython-311.pyc
new file mode 100644
index 0000000..28064d5
Binary files /dev/null and b/wikideck/Mine/__pycache__/Database.cpython-311.pyc differ
diff --git a/wikideck/Mine/__pycache__/Mine.cpython-311.pyc b/wikideck/Mine/__pycache__/Mine.cpython-311.pyc
new file mode 100644
index 0000000..cb92f5f
Binary files /dev/null and b/wikideck/Mine/__pycache__/Mine.cpython-311.pyc differ
diff --git a/wikideck/Mine/__pycache__/Transaction.cpython-311.pyc b/wikideck/Mine/__pycache__/Transaction.cpython-311.pyc
new file mode 100644
index 0000000..073a521
Binary files /dev/null and b/wikideck/Mine/__pycache__/Transaction.cpython-311.pyc differ
diff --git a/wikideck/PeerHandler/PeerHandler.py b/wikideck/PeerHandler/PeerHandler.py
new file mode 100644
index 0000000..f5443bf
--- /dev/null
+++ b/wikideck/PeerHandler/PeerHandler.py
@@ -0,0 +1,36 @@
+###
+# The PeerHandler sends new blocks and transactions to available peers.
+###
+
+import requests
+
+from Mine.Block import Block
+from Mine.Transaction import Transaction
+
+class PeerHandler():
+    def __init__(self):
+        return
+
+    def add_peer(self. peer):
+        try:
+            db.insert_peer(peer.peerId, peer.url)
+        # TODO: error handling
+        except Exception as e:
+            print('crap!')
+
+    def propogate_block(self, block):
+        try:
+            for peer in db.get_available_peers():
+                requests.post(peer.url, data=str(block))
+                db.update_last_try(peer.peerId)
+        # TODO: error handling
+        except Exception as e:
+            print('crap!')
+
+    def propogate_transaction(self, transaction):
+        try:
+            for peer in db.get_available_peers():
+                requests.post(peer.url, data=str(transaction))
+        # TODO: error handling
+        except Exception as e:
+            print('crap!')
diff --git a/wikideck/__init__.py b/wikideck/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/wikideck/app.py b/wikideck/app.py
index df45a6a..e0546be 100644
--- a/wikideck/app.py
+++ b/wikideck/app.py
@@ -1,29 +1,14 @@
 import dotenv
+import flask
 import time
-import os
 
-dotenv.load_dotenv()
+#from Market.Market import market
+from Mine.Mine import mine
 
-ROLE = os.getenv("ROLE", None)
-INTERVAL = os.getenv("INTERVAL", 15)
+app = flask.Flask(__name__)
+#app.register_blueprint(market, url_prefix="/market")
+app.register_blueprint(mine, url_prefix="/mine")
 
 if __name__ == "__main__":
-    if ROLE == "api":
-        from Market.Market import market
-        from Mine.Mine import mine
-        app = Flask(__name__)
-        app.register_blueprint(market, url_prefix="/market")
-        app.register_blueprint(mine, url_prefix="/mine")
-        app.run()
-    elif ROLE == "order_matcher":
-        from OrderMatcher.OrderMatcher import OrderMatcher
-        orderMatcher = OrderMatcher()
-        while True:
-            orderMatcher.match_orders()
-            time.sleep(INTERVAL)
-    elif ROLE == "status_checker":
-        from StatusChecker.StatusChecker import StatusChecker
-        statusChecker = StatusChecker()
-        while True:
-            statusChecker.check_pending_transactions()
-            time.sleep(INTERVAL)
+    dotenv.load_dotenv()
+    app.run()
diff --git a/wikideck/client.py b/wikideck/client.py
new file mode 100644
index 0000000..1479dbb
--- /dev/null
+++ b/wikideck/client.py
@@ -0,0 +1,23 @@
+import json
+import os
+import requests
+
+from cryptography.hazmat.primitives.asymmetric import rsa
+
+from Mine.Block import Block
+
+WIKIDECK_URL = os.getenv('WIKIDECK_URL', 'http://localhost:8080/')
+
+privateKey = rsa.generate_private_key(
+    public_exponent=65537,
+    key_size=4096
+    )
+
+newBlock = Block(
+    data = requests.get(f"{WIKIDECK_URL}/mine/blocks").json()
+    )
+newBlock.mine(privateKey)
+print(newBlock)
+
+r = requests.post(f"{WIKIDECK_URL}/mine/blocks", data=newBlock.as_dict())
+print(r)
diff --git a/wsgi_app.py b/wsgi_app.py
new file mode 100644
index 0000000..f888639
--- /dev/null
+++ b/wsgi_app.py
@@ -0,0 +1,4 @@
+import sys
+sys.path.insert(0, '/usr/local/apache2/htdocs/wikideck')
+
+from app import app as application