Upgrade to Pro — share decks privately, control downloads, hide ads and more …

What in the world is Bitcoin? [2017]

alphydan
October 05, 2017

What in the world is Bitcoin? [2017]

First of the Talking Technology talks on Bitcoin, given on October 2017 in Bermuda.

alphydan

October 05, 2017
Tweet

More Decks by alphydan

Other Decks in Technology

Transcript

  1. What in the
    world is
    Itcoin ?

    View full-size slide

  2. Hello!
    I am Alvaro Feito Boirac, PhD
    Quantum Physicist, teacher, coder, crypto enthusiast

    View full-size slide

  3. What in the
    world is
    Itcoin ?

    View full-size slide

  4. EASY!
    It’s internet CASH!

    View full-size slide

  5. EASY!
    electronic

    View full-size slide

  6. EASY!
    electronic pseudo-anonymous

    View full-size slide

  7. EASY!
    electronic pseudo-anonymous decentralized

    View full-size slide

  8. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work

    View full-size slide

  9. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work blockchain based

    View full-size slide

  10. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work blockchain based
    crypto-currency

    View full-size slide

  11. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work blockchain based
    crypto-currency

    View full-size slide

  12. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work blockchain based
    crypto-currency

    View full-size slide

  13. > 90%* of fiat money is already electronic (digital)

    View full-size slide

  14. > 90% of fiat money is already digital*

    View full-size slide

  15. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work blockchain based
    crypto-currency

    View full-size slide

  16. EASY!
    electronic Currency on a MAGIC ledger

    View full-size slide

  17. EASY!
    electronic Currency on a SPECIAL ledger

    View full-size slide

  18. a special ledger
    BItcoin IS

    View full-size slide

  19. JOE - 2.2 BTC
    ALICE - 1 BTC
    RUNA - 0.0042 BTC
    Bitcoin is a LEDGER

    View full-size slide

  20. JOE - 2.2 BTC
    ALICE - 1 BTC
    RUNA - 0.0042 BTC
    Bitcoin is a LEDGER
    1 BTC

    View full-size slide

  21. JOE - 2.2 - 1 BTC
    ALICE - 1 +1 BTC
    RUNA - 0.0042 BTC
    Bitcoin is a LEDGER

    View full-size slide

  22. Ok, I know ledgers.
    BUT
    Where is the ledger?
    Who updates it?
    Why not write a fake balance?
    Who issues the BTC?

    View full-size slide

  23. “THAT’s WHERE
    THE MAGIC HAPPENS”

    View full-size slide

  24. 1. Who updates the ledger?

    View full-size slide

  25. 1. Who updates the ledger?
    × Central Bank
    × Bank
    × VISA/W.Union

    View full-size slide

  26. 1. Who updates the ledger?
    × CENTRAL
    × TRUSTED
    × AUTHORITY
    × MIDDLEMEN

    View full-size slide

  27. 1. Who updates the ledger?

    View full-size slide

  28. 1. Who updates the ledger?
    × BOOKKEEPERS ARE THOSE
    WHO CHOOSE TO PARTICIPATE

    View full-size slide

  29. BITCOIN
    The bank run by YOU!

    View full-size slide

  30. Bill $100
    Runa $100
    Alice $100
    Joe $100

    View full-size slide

  31. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work blockchain based
    crypto-currency

    View full-size slide

  32. 1VayNert3x1KzbpzMGt2qdqrAThiRovi8 2 BTC
    15JhBLtCWaDqrMrgcyDhu7m62TVZxgrtj8 0.018 BTC
    1P9RQEr2XeE3PEb44ZE35sfZRRW1JHU8qx 4,318 BTC
    18p9Ftp3m4435tdpZTvoBsm3yjUgkvTF2b 3.1 BTC
    1D5bPm1YAdn9WvAAixht7PbACU3TtkqtJJ 48.5 BTC
    ...

    View full-size slide

  33. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work blockchain based
    crypto-currency

    View full-size slide

  34. Place your screenshot here
    The LEDGER
    IS PUBLIC &
    DISTRIBUTED

    View full-size slide

  35. 1VayN.. 2 BTC
    15JhB.. 0.018 BTC
    1P9RQ.. 4,318 BTC
    18p9F.. 3.1 BTC
    1D5bP.. 48.5 BTC
    1VayN.. 2 BTC
    15JhB.. 0.018 BTC
    1P9RQ.. 4,318 BTC
    18p9F.. 3.1 BTC
    1D5bP.. 48.5 BTC
    1VayN.. 2 BTC
    15JhB.. 0.018 BTC
    1P9RQ.. 4,318 BTC
    18p9F.. 3.1 BTC
    1D5bP.. 48.5 BTC
    1VayN.. 2 BTC
    15JhB.. 0.018 BTC
    1P9RQ.. 4,318 BTC
    18p9F.. 3.1 BTC
    1D5bP.. 48.5 BTC
    1VayN.. 2 BTC
    15JhB.. 0.018 BTC
    1P9RQ.. 4,318 BTC
    18p9F.. 3.1 BTC
    1D5bP.. 48.5 BTC

    View full-size slide

  36. How is the LEDGER

    View full-size slide

  37. Peter (1EiwDW9VjTUbLJtuPYUkbj5fJDnc36WKdz) 1mBTC → Allie (1AxZb1Nqh7TPWURjLbDUQsSpUQZnF5cqLe)
    Img source

    View full-size slide

  38. Peter (1EiwDW9VjTUbLJtuPYUkbj5fJDnc36WKdz) 1mBTC → Allie (1AxZb1Nqh7TPWURjLbDUQsSpUQZnF5cqLe)
    Img source

    View full-size slide

  39. Peter (1EiwDW9VjTUbLJtuPYUkbj5fJDnc36WKdz) 1mBTC → Allie (1AxZb1Nqh7TPWURjLbDUQsSpUQZnF5cqLe)
    Img source

    View full-size slide

  40. $8,000,000*
    in transactions, one bookkeeper gets 12.5 BTC
    For updating “the book” with

    View full-size slide

  41. REAL LIFE BITCOIN
    “BOOKKEEPERS”

    View full-size slide

  42. Img source
    Peter
    1EiwDW9VjTUbLJtuPY
    Ukbj5fJDnc36WKdz
    BALANCE: 1 BTC

    View full-size slide

  43. Img source
    Peter
    BALANCE:
    1 BTC
    Peter 1 BTC → Bob

    View full-size slide

  44. Img source
    Peter
    BALANCE:
    1 BTC
    Peter 1 BTC → Allie
    Peter 1 BTC → Bob

    View full-size slide

  45. Img source
    Peter
    BALANCE:
    1 BTC
    Double
    Spending

    View full-size slide

  46. Img source
    Peter
    BALANCE:
    1 BTC
    Peter
    (1EiwDW9VjTUbLJtuPYUkbj5fJDnc36WKdz)
    1BTC → Allie
    (1AxZb1Nqh7TPWURjLbDUQsSpUQZnF5cqLe)

    View full-size slide

  47. Img source
    Peter
    BALANCE:
    1 BTC
    Julia
    (6Yr4nT0ppJVSXYPq0PQzSDEfJDnc36SAxm)
    100 BTC → Allie
    (1AxZb1Nqh7TPWURjLbDUQsSpUQZnF5cqLe)

    View full-size slide

  48. Img source
    Peter
    BALANCE:
    1 BTC
    Who sent
    WHAT?

    View full-size slide

  49. Img source
    MALICIOUS
    UPDATE

    View full-size slide

  50. WE MADE IT TO
    THE HEART OF
    Itcoin ?

    View full-size slide

  51. HOW DO YOU UPDATE A
    TRUSTLESS, DISTRIBUTEd
    DIGITAL MONEY LEDGER?

    View full-size slide

  52. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work blockchain based
    crypto-currency

    View full-size slide

  53. Img source
    SUMMARY BOX

    View full-size slide

  54. Img source
    SUMMARY BOX
    CAPULET
    My sword, I say.Old Montague
    is come And flourishes hisblade
    in spite of me.
    ROMEO
    Thou villain Capulet!—Hold me
    not; let me go.
    LADY MONTAGUE
    Thou shalt not stir one foot to
    seek a foe.
    PRINCE
    Rebellious subjects, enemies
    . . . . . . . . . . .
    Romeo & Juliet in
    love. Parents don’t
    approve. Drama ensues.

    View full-size slide

  55. Img source
    SUMMARY BOX
    CAPULET
    My sword, I say.Old Montague
    is come And flourishes hisblade
    in spite of me.
    PETER
    Thou villain Capulet!—Hold me
    not; let me go.
    LADY MONTAGUE
    Thou shalt not stir one foot to
    seek a foe.
    PRINCE
    Rebellious subjects, enemies
    . . . . . . . . . . .
    Peter & Juliet in
    love. Parents don’t
    approve. Drama ensues.

    View full-size slide

  56. Img source
    MAGIC SUMMARY BOX

    View full-size slide

  57. Img source
    MAGIC SUMMARY BOX
    730e109bd7a8a32b1cb9d9a09aa2325
    d2430587ddbc0c38bad911525
    CAPULET
    My sword, I say.Old Montague
    is come And flourishes hisblade
    in spite of me.
    ROMEO
    Thou villain Capulet!—Hold me
    not; let me go.
    LADY MONTAGUE
    Thou shalt not stir one foot to
    seek a foe.
    PRINCE
    Rebellious subjects, enemies
    . . . . . . . . . . .

    View full-size slide

  58. Img source
    MAGIC SUMMARY BOX
    619cba8e8e05826e9b8c519c0a5c68f4
    fb653e8a3d8aa04bb2c8cd4c
    CAPULET
    My sword, I say.Old Montague
    is come And flourishes hisblade
    in spite of me.
    RODEO
    Thou villain Capulet!—Hold me
    not; let me go.
    LADY MONTAGUE
    Thou shalt not stir one foot to
    seek a foe.
    PRINCE
    Rebellious subjects, enemies
    . . . . . . . . . . .

    View full-size slide

  59. MAGIC SUMMARY BOX
    6ed0dd02806fa89e25de060c19d3ac8
    6cabb87d6a0ddd05c333b84f4
    42Gb

    View full-size slide

  60. MAGIC SUMMARY BOX
    d14a028c2a3a2bc9476102bb288234c
    415a2b01f828ea62ac5b3e42f
    42Gb
    (Add a letter or comma)

    View full-size slide

  61. MAGIC SUMMARY BOX
    cd6357efdd966de8c0cb2f876cc89ec7
    4ce35f0968e11743987084bd42f
    dog

    View full-size slide

  62. INPUT d14a028c2a3a2bc9476102bb288234c
    415a2b01f828ea62ac5b3e42f
    GOOD SUMMARY BOX:
    SAME OUTPUT

    View full-size slide

  63. sje92na92a3a2bc9476102bb288234c
    415a2b01f828ea6fjeni293749
    GOOD SUMMARY BOX:
    IMPOSSIBLE TO REVERSE

    View full-size slide

  64. sje92na92a3a2bc9476102bb288234c
    415a2b01f828ea6fjeni293749
    GOOD SUMMARY BOX:
    Can’T REVERSE (Have to try all )
    a
    Aa
    Aaa
    Aaaa
    Aaaaa
    Aaaaab
    Aaaaaaa
    Aaaaaaaa
    Aaaaaaaaa
    Aaaaaaaaaa
    Aaaaaaaaaaa
    Aaaaaaaaaaaa
    B
    Bb
    Bbb
    Bbbb
    Hodll

    View full-size slide

  65. Img source
    Julia
    BALANCE:
    100 BTC
    Julia
    (6Yr4nT0ppJVSXYPq0PQzSDEfJDnc36SAxm)
    10 BTC → Allie
    (1AxZb1Nqh7TPWURjLbDUQsSpUQZnF5cqLe)

    View full-size slide

  66. Img source
    Peter
    BALANCE:
    1 BTC
    Julia
    (6Yr4nT0ppJVSXYPq0PQzSDEfJDnc36SAxm)
    100 BTC → Allie
    (1AxZb1Nqh7TPWURjLbDUQsSpUQZnF5cqLe)
    SIGNED:
    1011010011
    1010100100
    1001010011

    View full-size slide

  67. Img source
    Peter
    BALANCE:
    1 BTC
    Julia
    (6Yr4nT0ppJVSXYPq0PQzSDEfJDnc36SAxm)
    100 BTC → Allie
    (1AxZb1Nqh7TPWURjLbDUQsSpUQZnF5cqLe)
    SIGNED:
    1011010011
    1010100100
    1001010011
    b2fa3d8e577402cf5654dbf559d89702c33db73667fa38fba4bdebdb924c1fb9

    View full-size slide

  68. Img source
    MAGIC VERIFY BOX

    View full-size slide

  69. Img source
    MAGIC VERIFY BOX
    b2fa3d8e577402cf5654dbf559d89702c3
    3db73667fa38fba4bdebdb924c1fb9
    Julia
    6Yr4nT0ppJVSXYPq0PQzSDEfJDnc36SAxm

    View full-size slide

  70. Img source
    MAGIC VERIFY BOX
    b2fa3d8e577402cf5654dbf559d89702c3
    3db73667fa38fba4bdebdb924c1fb9
    Julia
    6Yr4nT0ppJVSXYPq0PQzSDEfJDnc36SAxm

    View full-size slide

  71. Img source
    MAGIC VERIFY BOX
    b2fa3d8e577402cf5654dbf559d89702c3
    3db73667fa38fba4bdebdb924c1fb9
    Julia
    6Yr4nT0ppJVSXYPq0PQzSDEfJDnc36SAxm
    100% sure JULIA
    SENT IT.

    View full-size slide

  72. Img source
    MAGIC VERIFY BOX
    b2fa3d8e577402cf5654dbf559d89702c3
    3db73667fa38fba4bdebdb924c1fb9
    Julia
    6Yr4nT0ppJVSXYPq0PQzSDEfJDnc36SAxm
    100% sure JULIA
    SENT IT.
    SIGNED:
    1011010011
    1010100100
    1001010011

    View full-size slide

  73. Img source
    Julia
    (6Yr4nT0ppJVSXYPq0PQzSDEfJDnc36SAxm)
    100 BTC → Allie
    (1AxZb1Nqh7TPWURjLbDUQsSpUQZnF5cqLe)
    a34b228a7f67d75f72499cd4b9d52952c8339286ad4f1eae612eb32a9cb3115
    ?

    View full-size slide

  74. Img source
    Bank Account #: 6Yr4nT0ppJVSXYPq0PQzSDEfJDnc36SAxm
    SIGNED:
    1011010011
    1010100100
    1001010011

    View full-size slide

  75. Img source
    Public Address: LcHDYmyoBtbzsvgn7Vcsb4fLwr8A9tBkXz
    Private Key: 6vdoxL5QtZiXQjQ9XZee8U1P3CXUwmzD2RVMWdK6ka6KskCB2MY

    View full-size slide

  76. Img source
    Public Address: LcHDYmyoBtbzsvgn7Vcsb4fLwr8A9tBkXz
    Private Key: 6vdoxL5QtZiXQjQ9XZee8U1P3CXUwmzD2RVMWdK6ka6KskCB2MY
    Send money to X

    View full-size slide

  77. Img source
    Public Address: LcHDYmyoBtbzsvgn7Vcsb4fLwr8A9tBkXz
    Private Key: 6vdoxL5QtZiXQjQ9XZee8U1P3CXUwmzD2RVMWdK6ka6KskCB2MY
    Send money to X

    View full-size slide

  78. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work blockchain based
    crypto-currency

    View full-size slide

  79. MAGIC SUMMARY BOX
    cd6357efdd966de8c0cb2f876cc89ec7
    4ce35f0968e11743987084bd42f
    dog

    View full-size slide

  80. MAGIC SUMMARY BOX
    77af778b51abd4a3c51c5ddd97204a9c
    3ae614ebccb75a606c3b6865
    cat

    View full-size slide

  81. MAGIC SUMMARY BOX
    589856ec9cedf51a3f0f173465bd499d
    73add0cac701f50533fad6b20f3e
    JOE - 2.1 BTC
    ALICE - 1 .1 BTC
    RUNA - 0.0042 BTC
    JANE - 0.0042 BTC
    WEI - 0.0042 BTC
    HAL - 0.02 BTC
    SATO - 0.0032 BTC
    SHI - 0.0042 BTC
    JOE - 2.1 BTC
    ALICE - 1 .1 BTC
    RUNA - 2.0042 BTC
    JANE - 1.0042 BTC
    WEI - 45.02 BTC
    HAL - 2,000 BTC
    SATO - 0.0042 BTC
    SHI - 0.0042 BTC
    JOE - 0.0001 BTC
    ALICE - 1 .1 BTC
    RUNA - 0.0042 BTC
    JANE - 0.0042 BTC
    WEI - 0.0042 BTC
    HAL - 0.0042 BTC
    SATO - 0.0042 BTC
    SHI - 0.0042 BTC
    ALICE - 1 .1 BTC
    RUNA - 0.0042 BTC
    JANE - 0.0042 BTC
    WEI - 0.0042 BTC
    HAL - 0.0042 BTC
    SATO - 0.0042 BTC
    SHI - 0.0042 BTC

    View full-size slide

  82. Every 10 minutes a new “Summary” is made
    JOE - 2.1 BTC
    ALICE - 1 .1 BTC
    RUNA - 0.0042 BTC
    JANE - 0.0042 BTC
    WEI - 0.0042 BTC
    HAL - 0.02 BTC
    SATO - 0.0032 BTC
    SHI - 0.0042 BTC
    77af778b51abd4a3c51c5ddd97204a9c
    3ae614ebccb75a606c3b6865

    View full-size slide

  83. Every 10 minutes a new “Summary” is made
    JOE - 2.1 BTC
    ALICE - 1 .1 BTC
    RUNA - 0.0042 BTC
    JANE - 0.0042 BTC
    WEI - 0.0045 BTC
    HAL - 0.02 BTC
    SATO - 0.0032 BTC
    SHI - 0.0042 BTC
    14ba98b40af2a18df3808227ff9332c8
    aa98727d3720863df68a413714e

    View full-size slide

  84. Every 10 minutes a new “Summary” is made
    ALICE - 1 .1 BTC
    RUNA - 0.0042BTC
    JANE - 0.0042 BTC
    WEI - 0.0042 BTC
    HAL - 0.0042 BTC
    SATO - 0.0042 BTC
    SHI - 0.0042 BTC
    14ba98b40af2a18df38
    08227ff9332c8aa9827
    39j393j3939d3720863
    392jfmeovnmemdi2
    39384893jfnjnd393
    dae93j3felwknmsef

    View full-size slide

  85. Every 10 minutes a new “Summary” is made
    ALICE - 1 .1 BTC
    RUNA - 0.0042BTC
    JANE - 0.0042 BTC
    WEI - 0.0042 BTC
    HAL - 0.0042 BTC
    SATO - 0.0042 BTC
    SHI - 0.0042 BTC
    14ba98b40af2a18df38
    08227ff9332c8aa9827
    39j393j3939d3720863 392jfmeovnmemdi2
    39384893jfnjnd393
    dae93j3felwknmsef
    CAN’T change the past!

    View full-size slide

  86. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work blockchain based
    crypto-currency

    View full-size slide

  87. Img source
    ALICE - 1 .1 BTC
    RUNA - 0.0042 BTC
    JANE - 0.0042 BTC
    WEI - 0.0042 BTC
    HAL - 0.0042 BTC
    SATO - 0.0042 BTC
    SHI - 0.0042 BTC
    SHI - 0.0042 BTC
    BUT What about
    The PRESENT?

    View full-size slide

  88. Find a number such that:
    LEDGER + 1029482 00000000000000000000f0f173465bd
    499d73add0cac701f50533fad6b2

    View full-size slide

  89. Find a number such that:
    LEDGER + 1029482 00000000000000000000f0f173465bd
    499d73add0cac701f50533fad6b2
    12.5

    View full-size slide

  90. Find a number such that:
    LEDGER + 1029482 00000000000000000000f0f173465bd
    499d73add0cac701f50533fad6b2
    $56,000

    View full-size slide

  91. Find a number such that:
    LEDGER + 1 ad6cac701f50533fad6b2f173465bd49
    9d73add0cac701f50533fad6b2

    View full-size slide

  92. Find a number such that:
    LEDGER + 2 ffc9a7c51991e8b8d8eba3e33714e686
    4e6042f0f122b8058a8a1ecb34b6

    View full-size slide

  93. Find a number such that:
    LEDGER + 33 09689c1e421bb3ed387425962975352
    c93f5ae9f1fbe2859b5e41a80a23

    View full-size slide

  94. Find all the
    NUMBERZ !!

    View full-size slide

  95. Find a number such that:
    + 1029482 00000000000000000000f0f173465bd
    499d73add0cac701f50533fad6b2
    $56,000
    ALICE - 1 .1 BTC
    RUNA - 0.0042 BTC
    JANE - 0.0042 BTC
    WEI - 0.0202 BTC
    HAL - 0.0042 BTC
    SATO - 0.0042 BTC
    SHI - 0.0042 BTC

    View full-size slide

  96. Find a number such that:
    + 1029482 3dea57ef02538eb4e27b6c52ebf72375
    8eddc7c69bb11b1ea8b246fa5d4
    ALICE - 1 .1 BTC
    RUNA - 0.0042 BTC
    JANE - 0.0042 BTC
    WEI - 0.00
    52 BTC
    HAL - 0.0042 BTC
    SATO - 0.0042 BTC
    SHI - 0.0042 BTC

    View full-size slide

  97. Find a number such that:
    + 1029482 3dea57ef02538eb4e27b6c52ebf72375
    8eddc7c69bb11b1ea8b246fa5d4
    ALICE - 1 .1 BTC
    RUNA - 0.0042 BTC
    JANE - 0.0042 BTC
    WEI - 0.00
    52 BTC
    HAL - 0.0042 BTC
    SATO - 0.0042 BTC
    SHI - 0.0042 BTC
    Honesty = more profitable

    View full-size slide

  98. EASY!
    electronic pseudo-anonymous decentralized
    Proof-of-work blockchain based
    crypto-currency

    View full-size slide

  99. 1st time in History!
    Global & Trustless
    money transactions

    View full-size slide

  100. Christine Lagarde, IMF Chief
    Not be wise to dismiss
    virtual currencies. virtual
    currencies might just give
    existing currencies and
    monetary policy a run for
    their money

    View full-size slide

  101. THANKS!
    Talk at: bit.ly/Bitcoin56
    [email protected]

    View full-size slide

  102. Send $2 to friend in UK
    10 minutes, 2 cents
    Send $100 to Bolivia
    Send $1M to china on Sunday
    2h, $10
    20 minutes, 10 cents

    View full-size slide

  103. Pay for coffee
    10 minutes, $0.5?
    Donate to Wikileaks
    Banking for the unbanked
    5 minutes, no discrimination

    View full-size slide

  104. Money for oppressed
    Worldwide
    Travel with $5M in your head!
    Hedge for hyperinflation
    2h, $10

    View full-size slide

  105. $70,000,000,000
    Market cap
    $4500/BTC
    21,000,000
    Total supply

    View full-size slide

  106. Where can you spend it?
    WordPress.com
    Overstock.com
    Subway Microsoft
    Reddit
    Virgin Galactic
    OkCupid
    Namecheap
    CheapAir.com
    Expedia.com
    Gyft
    Newegg.com
    Wikipedia
    Steam
    The Internet Archive
    Bitcoin.Travel
    Pembury Tavern
    Old Fitzroy
    Zynga – Mobile gaming
    Mega.co.nz
    Etsy Vendors – 93 of them
    Whole Foods
    - Real Estate
    - Computing
    - Lawyers
    - Actual
    Accountants
    - Darknet ...

    View full-size slide

  107. 500,000 Needed to
    match the Bitcoin network!

    View full-size slide

  108. Huge Mining (bookkeeping)
    operations in CHINA, ICELAND, US

    View full-size slide

  109. Huge Mining (bookkeeping)
    operations in CHINA, ICELAND, US

    View full-size slide

  110. BLOCKCHAIN
    Contains all balances & all
    transactions done since 2009.

    View full-size slide

  111. Money
    https://www.federalreserve.gov/releases/h6/current/default.htm
    https://courses.lumenlearning.com/boundless-economics/chapter/introducing-money/
    https://www.quora.com/What-percentage-of-the-worlds-money-is-printed-in-cash-bills-coins
    http://www.marketwatch.com/story/this-is-how-much-money-exists-in-the-entire-world-in-one-cha
    rt-2015-12-18
    http://www.investopedia.com/tech/how-much-worlds-money-bitcoin/
    https://coinmarketcap.com/

    View full-size slide

  112. Blockchain
    https://bitcoinstrings.com/ (messages on the blockchain)
    https://cointelegraph.com/news/active-bitcoin-wallets-number-has-grown-four-fold-over-five-years
    -study
    https://anders.com/blockchain/

    View full-size slide