This document discusses Bitcoin Improvement Proposals (BIPs) and various Bitcoin wallet concepts. It describes three types of BIPs - standards track, informational, and process BIPs. It also discusses several important BIPs related to Bitcoin wallets, including BIP-32 which describes hierarchical deterministic wallets, BIP-39 which specifies mnemonic code for generating deterministic wallets, and BIP-44 which defines a logical hierarchy for deterministic wallets. Additionally, it covers other wallet-related topics like brain wallets, wallet import format, private/public keys, and signing/verifying messages.

2. Kenneth Hu
• CTO at Baypay Inc.
• I am enthusiast, not expert.
• Ethereum, Bitcoin, AR, ChatBot
• Email: Kenneth.hu@Hotmail.com
• Blockchain&Dapps meetup
• Singapore IOTA meetup

3. BIP : Bitcoin Improvement Proposals
• A Bitcoin Improvement Proposal (BIP) is a design
document for introducing features or information to
Bitcoin. The BIP should provide a concise technical
specification of the feature and a rationale for the
feature. This is the standard way of communicating
ideas since Bitcoin has no formal structure.

4. BIP Life Cycle

5. Types of BIPs
• 1. Standards Track BIPs – Such types of BIPs entail
making changes to the network protocol, block, or
transaction validation method. An example of this is BIP
91.
• 2. Informational BIPs – Such types of BIPs highlight the
design issues, general guidelines, and supporting
information. An example of this is BIP 32.
• 3. Process BIPs – These types of BIPs describe or propose
a change in the process. An example of this is BIP 2.

6. Bitcoin Wallet with BIP

7. Bitcoin Wallet with BIP
• BIP-32
• BIP-39
• BIP-44

8. BIP-0032
• This document describes hierarchical determinstic
wallets (or "HD Wallets"): wallets which can be shared
partially or entirely with different systems, each with
or without the ability to spend coins.
• https://github.com/bitcoin/bips/blob/master/
bip-0032.mediawiki

9. BIP-0032

10. BIP-0039
• This BIP describes the implementation of a
mnemonic code or mnemonic sentence -- a group of
easy to remember words -- for the generation of
deterministic wallets.
• https://github.com/bitcoin/bips/blob/master/
bip-0039.mediawiki

11. BIP-0039

12. BIP-0044
• This BIP defines a logical hierarchy for deterministic
wallets based on an algorithm described in BIP-0032
(BIP32 from now on) and purpose scheme described
in BIP-0043 (BIP43 from now on).
• https://github.com/bitcoin/bips/blob/master/
bip-0044.mediawiki

13. BIP-0044
• Define the following 5 levels in BIP32 path:
• Purporse : BIP44
• Coin_type: 0 (Bitcoin)、60 (Ethereum)
• Account: are numbered from index 0 in sequentially
increasing manner. This number is used as child index in
BIP32 derivation.

14. Brain wallet
A brain wallet is a standard wallet that
generates its address by hashing a
passphrase to create a private key and
therefore a public key and resultant
address.

15. Brain wallet
private key :
65be4aa2cbc47df49336225155481f20305cf49ee8
baf66edeb808bc4e7bc4c9 ,
Public key :
14TbUVUR7BbzBvjKoURTgLNcpq6EbScEdF

16. Wallet import format (WIF)
Wallet Import Format (WIF, also known as Wallet
Export Format) is a way of encoding a private
ECDSA key so as to make it easier to copy.
https://bitcoin.org/en/glossary/wallet-import-format

17. Wallet import format (WIF)
https://bitcoin.org/en/glossary/wallet-import-format

18. Mnemonic
A mnemonic phrase, mnemonic recovery phrase or mnemonic seed is a
list of words which store all the information needed to recover a
Bitcoin wallet. Wallet software will typically generate a mnemonic
backup phrase and instruct the user to write it down on paper. If the
user's computer breaks or their hard drive becomes corrupted, they can
download the same wallet software again and use the paper backup to
get their bitcoins back.
Anybody else who discovers the phrase can steal the bitcoins, so it
must be kept safe like jewels or cash. For example, it must not be
typed into any website.
Mnemonic phrases are an excellent way of backing up and storing
bitcoins and so they are used by almost all well-regarded wallets.

19. Mnemonic

20. Private 、Public and address
Private
Key
Public
Key
Wallet
address
Public
ledger
Bitcoin
Transaction
Every Bitcoin wallet is created based
on a cryptography algorithm, which
create asymmetric key paris: Private
and Public
Every time there is an exchange of Bitcoin
between two parities, the transaction has be
signed by the private keys

21. Sign-verify messages
You can verify Bitcoin signed message signature. You just have to provide
the Bitcoin address, generated signature and the message that has to be
verified.

22. Bitcoin WebSite

23. Kenneth’s bitcoin website
• Wallet
• Converter
• Wallet Info
• Transfer
• QRcode
• http://www.kennethhu.net/example/bitcoin/index.html

24. Framework & Package
Framework :
• NodeJS
• EJS -- Embedded JavaScript templates
Package :
• bitcore-mnemonic
• bitcore-explorers
• bitcore-lib
• express
• request
• body-parser

25. Website

26. Folder

27. EJS -- Embedded JavaScript
templates

28. EJS file

29. MVC (model, View and Controller)
M = model !Data JSON
V = view !Template ejs
C = controller !node.js

30. MVC (model, View and Controller)

31. MVC (model, View and Controller)

32. Project folder

33. App.js

34. Index.ejs

35. superheroes.ejs

36. about.ejs

37. Partials – head.ejs

38. Partials – header.ejs

39. EJS

40. How to create bitcoin wallet

41. 3 ways to generate bitcoin wallet
• Brain wallet
• WIF wallet
• Mnemonic

43. Exchange Rate source
• CoinMarketCap
• https://pro.coinmarketcap.com/features
• API :
• CoinAPI.io
• CoinBase
• https://api.coinbase.com/v2/prices/spot?currency=USD
• Blockchain
• https://www.blockchain.com/stats
• API : https://api.blockchain.info/stats

44. Exchange Rate code
• https://api.blockchain.info/stats

45. Exchange Rate code
• https://api.blockchain.info/stats

46. Wallet Info

47. Wallet Info

48. • https://blockexplorer.com/api
Wallet Info

49. Wallet Info

50. Transfer

51. UXTO
UXTO （Unspent Transaction Outputs）, An Unspent
Transaction Output (UTXO) that can be spent as an input in a
new transaction.
https://bitcoin.org/en/glossary/unspent-transaction-output

52. UXTO
UXTO （Unspent Transaction Outputs）

53. QR Code

54. Useful links
• https://www.bitaddress.org/
• https://iancoleman.io/bip39/
• https://iancoleman.io/bitcoin-key-compression/
• Check public key
• https://blockchain.info/
• https://live.blockcypher.com/
• https://blockexplorer.com/
• Faucet
• https://coinfaucet.eu/en/btc-testnet/