以上功能用Python实现

由于题目没有具体说明实现方式，我将给出一种可能的实现方式：

# 导入必要的库
import hashlib
import json
import time

# 定义区块类
class Block:
    def __init__(self, index, timestamp, data, previous_hash):
        self.index = index
        self.timestamp = timestamp
        self.data = data
        self.previous_hash = previous_hash
        self.hash = self.calculate_hash()

    def calculate_hash(self):
        sha = hashlib.sha256()
        sha.update(str(self.index).encode('utf-8') +
                   str(self.timestamp).encode('utf-8') +
                   str(self.data).encode('utf-8') +
                   str(self.previous_hash).encode('utf-8'))
        return sha.hexdigest()

# 定义区块链类
class Blockchain:
    def __init__(self):
        self.chain = [self.create_genesis_block()]

    def create_genesis_block(self):
        return Block(0, time.time(), 'Genesis Block', '0')

    def add_block(self, data):
        previous_block = self.chain[-1]
        new_block = Block(len(self.chain), time.time(), data, previous_block.hash)
        self.chain.append(new_block)

    def is_valid(self):
        for i in range(1, len(self.chain)):
            current_block = self.chain[i]
            previous_block = self.chain[i-1]
            if current_block.hash != current_block.calculate_hash():
                return False
            if current_block.previous_hash != previous_block.hash:
                return False
        return True

    def to_dict(self):
        blocks = []
        for block in self.chain:
            block_dict = {
                'index': block.index,
                'timestamp': block.timestamp,
                'data': block.data,
                'previous_hash': block.previous_hash,
                'hash': block.hash
            }
            blocks.append(block_dict)
        return {'blocks': blocks}

    def from_dict(self, block_dict):
        self.chain = []
        for block in block_dict['blocks']:
            new_block = Block(block['index'], block['timestamp'], block['data'], block['previous_hash'])
            new_block.hash = block['hash']
            self.chain.append(new_block)

# 测试代码
if __name__ == '__main__':
    # 创建区块链实例
    blockchain = Blockchain()

    # 添加区块
    blockchain.add_block('Hello World')
    blockchain.add_block('This is Blockchain')
    blockchain.add_block('It is amazing')

    # 验证区块链
    print('Is blockchain valid? ', blockchain.is_valid())

    # 将区块链转化为字典
    blockchain_dict = blockchain.to_dict()

    # 将字典恢复为区块链
    new_blockchain = Blockchain()
    new_blockchain.from_dict(blockchain_dict)

    # 验证新的区块链
    print('Is new blockchain valid? ', new_blockchain.is_valid())

注：以上代码仅供参考，实际应用中还需要考虑并发、共识算法、网络传输等方面。