The document discusses various ways that information can be stored on the Bitcoin blockchain, including: 1) Storing messages in the coinbase of mined blocks by including ASCII text in hexadecimal format. 2) Using OP_RETURN scripts to store data in a blockchain transaction to create multi-signature wallets or store files with hashes. 3) Storing messages by including them in the public address of a wallet up to 34 characters in length. 4) Archiving files on the blockchain by storing the file hash and name in hexadecimal format sent to dummy wallets.

1. Informações no
Blockchain
da rede Bitcoin
Edilson Osorio Junior - Fev/2016

2. Mensagem do Minerador (Coinbase)
https://blockchain.
info/tx/4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afde
da33b
04ffff001d0104455468652054696d65732030332f4a616e2f3230303920436861
6e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f75
7420666f722062616e6b73
Usar http://www.rapidtables.com/convert/number/hex-to-ascii.htm para
converter o hexadecimal
"The Times 03/Jan/2009 Chancellor on brink of second bailout for banks"

3. Mensagem do Minerador (Coinbase)

4. Utilizando campos OP_scripts como carteira multi-
assinada
Bitcoin Paper
https://blockchain.
info/tx/54e48e5f5c656b26c3bca14a8c95aa583d07ebe84dde3b7dd4a78f4e41
86e713
Códigos hexadecimais encadeados, enviados para carteiras fictícias através do
campo utilizado para carteiras multi-assinadas OP_1 (max 520 bytes, porém
517 bytes utilizáveis)

5. Utilizando endereço de wallet para mensagem
Endereço bitcoin possui até 34 caracteres
https://en.bitcoin.it/wiki/Vanitygen
http://bitcoinvanitygen.com/index.php (risco de roubo = não confiável)
Exemplo:
● 1CounterpartyXXXXXXXXXXXXXXXUWLpVr
● 1oriGMy27TK1YyrJuYxPvRparcf5HKuxs

6. Nelson Mandela (1918-2013)
"I am fundamentally an optimist. Whether that comes from nature or nurture, I cannot say. Part of being optimistic is
keeping one’s head pointed toward the sun, one’s feet moving forward. There were many dark moments when my
faith in humanity was sorely tested, but I would not and could not give myself up to despair. That way lays defeat and
death."
"I learned that courage was not the absence of fear, but the triumph over it. The brave man is not he who does not
feel afraid, but he who conquers that fear."
"Difficulties break some men but make others. No axe is sharp enough to cut the soul of a sinner who keeps on
trying, one armed with the hope that he will rise even in the end."
Armazenamento no endereço público

7. Armazenamento no endereço público
Transação:
https://blockchain.
info/tx/8881a937a437ff6ce83be3a89d77ea88ee12315f37f7ef0dd3742c30eef9
2dba
Hex 334E656C736F6E2D4D616E64656C612E6A70673F = [nome do arquivo]

8. Armazenamento no endereço público
HASH160 (160 bits = 20 bytes * 8)
Logo bitcoin
https://blockexplorer.
com/tx/ceb1a7fb57ef8b75ac59b56dd859d5cb3ab5c31168aa55eb3819cd5ddb
d3d806
https://blockexplorer.
com/tx/9173744691ac25f3cd94f35d4fc0e0a2b9d1ab17b4fe562acc07660552f9
5518
HASH160 3d79626567696e206c696e653d3132382073697a

9. Armazenamento no endereço público
● Endereço: 1749vn7Y5mhjZEYzHPCme3zFZ5mFkD2Z7p
● Mensagem armazenada no HASH160
● Verificar decodificando o hex

10. Armazenando no endereço público
Mensagem de 20 caracteres
Ex. "Bitcoin na FGV " (+ 6 espaços ao final) =
426974636f696e206e6120464756202020202020
Para converter: http://www.rapidtables.com/convert/number/ascii-to-hex.htm
https://blockchain.
info/q/hashtoaddress/426974636f696e206e6120464756202020202020
https://blockchain.info/address/1749vn7Y5mhjZEYzHPCme3zFZ5mFkD2Z7p

11. Campo OP_RETURN
● Baixou de 80 bytes para 40 bytes por motivo de spam (e tamanho de
bloco, etc.), mas voltou recentemente para 80 bytes
● Utilizado para armazenar informação em hexadecimal
As informações registradas no OP_RETURN podem representar:
● Trading
● Votação
● Smart property
● Smart contracts
● Programa de milhagem
● Controle de acesso
● Uma moeda própria

12. "A transfer of trust
in a trustless
world." - anônimo
Aula: Informações no Blockchain da
Rede Bitcoin
Edilson Osório Junior
osoriojr at originalmy dot com
@eddieoz
OriginalMy.com | CEO
Fev/2016