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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
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  1. What in the
    world is
    Itcoin ?

    View Slide

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

    View Slide

  3. What in the
    world is
    Itcoin ?

    View Slide

  4. EASY!
    It’s internet CASH!

    View Slide

  5. EASY!

    View Slide

  6. EASY!
    electronic

    View Slide

  7. EASY!
    electronic pseudo-anonymous

    View Slide

  8. EASY!
    electronic pseudo-anonymous decentralized

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

  12. Say
    WAT?

    View Slide

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

    View Slide

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

    View Slide

  15. > 90%* of fiat money is already electronic (digital)

    View Slide

  16. > 90% of fiat money is already digital*

    View Slide

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

    View Slide

  18. EASY!
    electronic Currency on a MAGIC ledger

    View Slide

  19. EASY!
    electronic Currency on a SPECIAL ledger

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  20. a special ledger
    BItcoin IS

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

  25. “THAT’s WHERE
    THE MAGIC HAPPENS”

    View Slide

  26. 1. Who updates the ledger?

    View Slide

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

    View Slide

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

    View Slide

  29. 1. Who updates the ledger?

    View Slide

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

    View Slide

  31. BITCOIN
    The bank run by YOU!

    View Slide

  32. View Slide

  33. Bill $100
    Runa $100
    Alice $100
    Joe $100

    View Slide

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

    View Slide

  35. 1VayNert3x1KzbpzMGt2qdqrAThiRovi8 2 BTC
    15JhBLtCWaDqrMrgcyDhu7m62TVZxgrtj8 0.018 BTC
    1P9RQEr2XeE3PEb44ZE35sfZRRW1JHU8qx 4,318 BTC
    18p9Ftp3m4435tdpZTvoBsm3yjUgkvTF2b 3.1 BTC
    1D5bPm1YAdn9WvAAixht7PbACU3TtkqtJJ 48.5 BTC
    ...

    View Slide

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

    View Slide

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

    View Slide

  38. 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 Slide

  39. How is the LEDGER

    View Slide

  40. View Slide

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

    View Slide

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

    View Slide

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

    View Slide

  44. $8,000,000*
    in transactions, one bookkeeper gets 12.5 BTC
    For updating “the book” with

    View Slide

  45. View Slide

  46. REAL LIFE BITCOIN
    “BOOKKEEPERS”

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  47. View Slide

  48. Img source

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

  52. Img source
    Peter
    BALANCE:
    1 BTC
    Double
    Spending

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

  56. Img source
    MALICIOUS
    UPDATE

    View Slide

  57. WE MADE IT TO
    THE HEART OF
    Itcoin ?

    View Slide

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

    View Slide

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

    View Slide

  60. Img source

    View Slide

  61. Img source

    View Slide

  62. Img source
    SUMMARY BOX

    View Slide

  63. 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 Slide

  64. 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 Slide

  65. Img source
    MAGIC SUMMARY BOX

    View Slide

  66. 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 Slide

  67. 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 Slide

  68. MAGIC SUMMARY BOX
    6ed0dd02806fa89e25de060c19d3ac8
    6cabb87d6a0ddd05c333b84f4
    42Gb

    View Slide

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

    View Slide

  70. MAGIC SUMMARY BOX
    cd6357efdd966de8c0cb2f876cc89ec7
    4ce35f0968e11743987084bd42f
    dog

    View Slide

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

    View Slide

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

    View Slide

  73. 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 Slide

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

    View Slide

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

    View Slide

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

    View Slide

  77. Img source
    MAGIC VERIFY BOX

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

  88. MAGIC SUMMARY BOX
    cd6357efdd966de8c0cb2f876cc89ec7
    4ce35f0968e11743987084bd42f
    dog

    View Slide

  89. MAGIC SUMMARY BOX
    77af778b51abd4a3c51c5ddd97204a9c
    3ae614ebccb75a606c3b6865
    cat

    View Slide

  90. 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 Slide

  91. 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 Slide

  92. 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 Slide

  93. 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 Slide

  94. 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 Slide

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

    View Slide

  96. 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 Slide

  97. bookeeper

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

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

    View Slide

  104. Find all the
    NUMBERZ !!

    View Slide

  105. 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 Slide

  106. 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 Slide

  107. 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 Slide

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

    View Slide

  109. 1st time in History!
    Global & Trustless
    money transactions

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  110. 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

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

    View Slide

  112. 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 Slide

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

    View Slide

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

    View Slide

  115. $70,000,000,000
    Market cap
    $4500/BTC
    21,000,000
    Total supply

    View Slide

  116. View Slide

  117. 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 Slide

  118. View Slide

  119. 500,000 Needed to
    match the Bitcoin network!

    View Slide

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

    View Slide

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

    View Slide

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

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  123. View Slide

  124. View Slide

  125. 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/

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  126. 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/

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