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// Block Chain should maintain only limited block nodes to satisfy the functions
// You should not have all the blocks added to the block chain in memory 
// as it would cause a memory overflow.
import java.sql.Array;
import java.util.*;
import java.util.stream.Collectors;
import java.sql.Timestamp;

public class BlockChain {
    public static final int CUT_OFF_AGE = 10;

yvetterowe

// MARK - Source of Truth

class SourceOfTruth: ObservableObject {
    @Published private(set) var value: Int = 0
    func increase() { value += 1 }
    func decrease() { value -= 1 }
}

// MARK - View

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// MARK: - Primitives

typealias Address = String
typealias Signature = String
typealias Coins = String

// MARK: - Transaction

enum Transaction {
    case coinbase(id: ID, outputs: [Output])

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import java.util.ArrayList;

public class TxHandler {

    private UTXOPool utxoPool;

    /**
     * Creates a public ledger whose current UTXOPool (collection of unspent transaction outputs) is
     * {@code utxoPool}. This should make a copy of utxoPool by using the UTXOPool(UTXOPool uPool)
     * constructor.