Add TyzenKit

TyzenKit.swift.podspec

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+Pod::Spec.new do |s|
+  s.name             = 'TyzenKit.swift'
+  s.module_name      = 'TyzenKit'
+  s.version          = '1.0'
+  s.summary          = 'Tyzen library for Swift.'
+
+  s.description      = <<-DESC
+TyzenKit implements Tyzen protocol in Swift.
+                       DESC
+
+  s.homepage         = 'https://github.com/horizontalsystems/bitcoin-kit-ios'
+  s.license          = { :type => 'MIT', :file => 'LICENSE' }
+  s.author           = { 'Horizontal Systems' => 'hsdao@protonmail.ch' }
+  s.source           = { git: 'https://github.com/horizontalsystems/bitcoin-kit-ios.git', tag: "tyzen-#{s.version}" }
+  s.social_media_url = 'http://horizontalsystems.io/'
+
+  s.ios.deployment_target = '13.0'
+  s.swift_version = '5'
+
+  s.source_files = 'TyzenKit/Classes/**/*'
+  s.resource_bundle = { 'TyzenKit' => 'TyzenKit/Assets/Checkpoints/*' }
+
+  s.requires_arc = true
+
+  s.dependency 'BitcoinCore.swift', '~> 0.18'
+  s.dependency 'OpenSslKit.swift', '~> 1.0'
+  s.dependency 'Secp256k1Kit.swift', '~> 1.0'
+  s.dependency 'HdWalletKit.swift', '~> 1.5'
+
+  s.dependency 'ObjectMapper', '~> 4.0'
+  s.dependency 'RxSwift', '~> 5.0'
+  s.dependency 'BigInt', '~> 5.0'
+  s.dependency 'GRDB.swift', '~> 5.0'
+end

TyzenKit/Assets/Checkpoints/MainNet-bip44.checkpoint

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+000000fd190d1f1f7685c1873e51cd8f1a543d9f7af17a7fe9a6fa90321b80f8

TyzenKit/Assets/Checkpoints/MainNet-last.checkpoint

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+000000fd190d1f1f7685c1873e51cd8f1a543d9f7af17a7fe9a6fa90321b80f8

TyzenKit/Assets/Checkpoints/TestNet-bip44.checkpoint

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+da67b050263323f14b35e9793ff9991366ef8e92fe5f83fb7e2781f9a3fd953b

TyzenKit/Assets/Checkpoints/TestNet-last.checkpoint

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+da67b050263323f14b35e9793ff9991366ef8e92fe5f83fb7e2781f9a3fd953b

TyzenKit/Classes/Core/Kit.swift

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+Pod::Spec.new do |s|
+  s.name             = 'TyzenKit.swift'
+  s.module_name      = 'TyzenKit'
+  s.version          = '1.0'
+  s.summary          = 'Tyzen library for Swift.'
+
+  s.description      = <<-DESC
+TyzenKit implements Tyzen protocol in Swift.
+                       DESC
+
+  s.homepage         = 'https://github.com/horizontalsystems/bitcoin-kit-ios'
+  s.license          = { :type => 'MIT', :file => 'LICENSE' }
+  s.author           = { 'Horizontal Systems' => 'hsdao@protonmail.ch' }
+  s.source           = { git: 'https://github.com/horizontalsystems/bitcoin-kit-ios.git', tag: "Tyzen-#{s.version}" }
+  s.social_media_url = 'http://horizontalsystems.io/'
+
+  s.ios.deployment_target = '13.0'
+  s.swift_version = '5'
+
+  s.source_files = 'TyzenKit/Classes/**/*'
+  s.resource_bundle = { 'TyzenKit' => 'TyzenKit/Assets/Checkpoints/*' }
+
+  s.requires_arc = true
+
+  s.dependency 'BitcoinCore.swift', '~> 0.18'
+  s.dependency 'OpenSslKit.swift', '~> 1.0'
+  s.dependency 'Secp256k1Kit.swift', '~> 1.0'
+  s.dependency 'HdWalletKit.swift', '~> 1.5'
+
+  s.dependency 'ObjectMapper', '~> 4.0'
+  s.dependency 'RxSwift', '~> 5.0'
+  s.dependency 'BigInt', '~> 5.0'
+  s.dependency 'GRDB.swift', '~> 5.0'
+end

TyzenKit/Classes/Core/LegacyDifficultyAdjustmentValidator.swift

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+import BigInt
+import BitcoinCore
+
+class LegacyDifficultyAdjustmentValidator: IBlockChainedValidator {
+    private let heightInterval: Int
+    private let targetTimespan: Int
+    private let maxTargetBits: Int
+
+    let difficultyEncoder: IDifficultyEncoder
+    let blockValidatorHelper: IBlockValidatorHelper
+
+    init(encoder: IDifficultyEncoder, blockValidatorHelper: IBlockValidatorHelper, heightInterval: Int, targetTimespan: Int, maxTargetBits: Int) {
+        difficultyEncoder = encoder
+        self.blockValidatorHelper = blockValidatorHelper
+
+        self.heightInterval = heightInterval
+        self.targetTimespan = targetTimespan
+        self.maxTargetBits = maxTargetBits
+    }
+
+    func validate(block: Block, previousBlock: Block) throws {
+        guard let beforeFirstBlock = blockValidatorHelper.previous(for: previousBlock, count: heightInterval) else {
+            throw BitcoinCoreErrors.BlockValidation.noPreviousBlock
+        }
+
+        var timespan = previousBlock.timestamp - beforeFirstBlock.timestamp
+        if (timespan < targetTimespan / 4) {
+            timespan = targetTimespan / 4
+        } else if (timespan > targetTimespan * 4) {
+            timespan = targetTimespan * 4
+        }
+
+        var bigIntDifficulty = difficultyEncoder.decodeCompact(bits: previousBlock.bits)
+        bigIntDifficulty *= BigInt(timespan)
+        bigIntDifficulty /= BigInt(targetTimespan)
+        var newDifficulty = difficultyEncoder.encodeCompact(from: bigIntDifficulty)
+
+        // Difficulty hit proof of work limit: newTarget
+        if newDifficulty > maxTargetBits {
+            newDifficulty = maxTargetBits
+        }
+
+        guard newDifficulty == block.bits else {
+            throw BitcoinCoreErrors.BlockValidation.notDifficultyTransitionEqualBits
+        }
+    }
+
+    func isBlockValidatable(block: Block, previousBlock: Block) -> Bool {
+        block.height % heightInterval == 0
+    }
+
+}

TyzenKit/Classes/Core/ProofOfWorkValidator.swift

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+import Foundation
+import BitcoinCore
+import BigInt
+
+class ProofOfWorkValidator: IBlockValidator {
+    private let hasher: IHasher
+    private let difficultyEncoder: IDifficultyEncoder
+
+    init(hasher: IHasher, difficultyEncoder: IDifficultyEncoder) {
+        self.hasher = hasher
+        self.difficultyEncoder = difficultyEncoder
+    }
+
+    private func serializeHeader(block: Block) -> Data {
+        var data = Data()
+
+        data.append(Data(from: UInt32(block.version)))
+        data += block.previousBlockHash
+        data += block.merkleRoot
+        data.append(Data(from: UInt32(block.timestamp)))
+        data.append(Data(from: UInt32(block.bits)))
+        data.append(Data(from: UInt32(block.nonce)))
+
+        return data
+    }
+
+    func validate(block: Block, previousBlock: Block) throws {
+        let header = serializeHeader(block: block)
+        let hash = hasher.hash(data: header)
+
+        guard (difficultyEncoder.compactFrom(hash: hash) < block.bits) else {
+            throw BitcoinCoreErrors.BlockValidation.invalidProofOfWork
+        }
+    }
+
+}

TyzenKit/Classes/Core/ScryptHasher.swift

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+import OpenSslKit
+import BitcoinCore
+
+class ScryptHasher: IHasher {
+
+    init() {}
+
+    func hash(data: Data) -> Data {
+        OpenSslKit.Kit.scrypt(pass: data)
+    }
+
+}

TyzenKit/Classes/Network/MainNet.swift

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+import BitcoinCore
+
+public class MainNet: INetwork {
+    public let bundleName = "TyzenKit"
+
+    public let pubKeyHash: UInt8 = 0x42
+    public let privateKey: UInt8 = 0xb0
+    public let scriptHash: UInt8 = 0x80
+    public let bech32PrefixPattern: String = "tzn"
+    public let xPubKey: UInt32 = 0x03b47334
+    public let xPrivKey: UInt32 = 0x03b473b9
+    public let magic: UInt32 = 0xfbc0b6db
+    public let port = 2332
+    public let coinType: UInt32 = 2
+    public let sigHash: SigHashType = .bitcoinAll
+    public var syncableFromApi: Bool = true
+
+    public let dnsSeeds = [
+        "node1.tyzen.io",
+        "node2.tyzen.io",
+        "node3.tyzen.io",
+        "node4.tyzen.io",
+        "node5.tyzen.io",
+        "node6.tyzen.io",
+        "node7.tyzen.io",
+        "node8.tyzen.io",
+        "node9.tyzen.io",
+        "node10.tyzen.io"
+    ]
+
+    public let dustRelayTxFee = 3000
+
+    public init() {}
+
+}

TyzenKit/Classes/Network/TestNet.swift

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+import BitcoinCore
+
+class TestNet: INetwork {
+    let bundleName = "TyzenKit"
+
+    let pubKeyHash: UInt8 = 0x42
+    let privateKey: UInt8 = 0xb0
+    let scriptHash: UInt8 = 0x80
+    let bech32PrefixPattern: String = "ttzn"
+    let xPubKey: UInt32 = 0x03ba2f80
+    let xPrivKey: UInt32 = 0x03ba3005
+    let magic: UInt32 = 0xfdd2c8f1
+    let port = 20595
+    let coinType: UInt32 = 1
+    let sigHash: SigHashType = .bitcoinAll
+    var syncableFromApi: Bool = false
+
+    let dnsSeeds = [
+        "testnet1.tyzen.io",
+        "testnet2.tyzen.io",
+        "testnet3.tyzen.io",
+    ]
+
+    let dustRelayTxFee = 3000 // https://github.com/bitcoin/bitcoin/blob/c536dfbcb00fb15963bf5d507b7017c241718bf6/src/policy/policy.h#L50
+}