Bart
Hello. I'm using Slides for sharing knowledge about blockchain and miscellaneous projects of mine.
blockchain & privacy
blockbar @bartroorda 2019-01-31
BANK /
COMPANY
ADDRESS1
sent
1 BTC
to
ADDRESS2
ADDRESS1
sent
1 BTC
to
Griffith
Bart
sent
1 BTC
to
Griffith
Bart
has
2788.01 ETH
on his address
goals of this session
- go through best practices
- discuss techniques on the way
on addresses
-
don't reuse addresses
-
be careful with exchanges
-
be careful with fiat gateways
on addresses
privacy coins
privacy coins
opt-in privacy
relies on zksnarks & trusted setup
privacy by default
uses ring confidential signatures
only private transactions
uses zksnarks & Zcash' trusted setup
there are no addresses, amounts are encrypted
uses MimbleWimble which uses CoinJoin
opt-in privacy using PrivateSend
uses CoinJoin, needs trust in MasterNodes
blockchain protocols
blockchain protocols
succinct blockchain enabled by recursive composition of zk-SNARKs
Coda protocol
CoinJoin
Coda protocol
Schnorr Signatures
Zksnarks
Zkstarks
put signatures of multiple transactions into 1 sig.
benefit: smaller transactions, therefor scalability
Taproot
makes all transactions look the same:
multisig tx is indistinguishable from normal tx
join transactions together -> create ambiguity about who is paying whom
zero-knowledge proofs in which no interaction is necessary between prover and verifier
transparent zero-knowledge proof system that's interactive without trusted setup
on exchanges
-
use decentralized exchanges
-
preferably run the software yourself
on exchanges
more on exchanges
The Jumblr protocol makes t- transactions z-transactions
- Bitcoin -> ZCash -> Bitcoin
- delayed in time
- payments done in power of 10s (0.01, 0.1, 1, 10, 100, etc)
examples on dex(change)s
on wallets
on wallets
basics:
- own your own money
- your key, your money. not your keys, not your money
ip address obfuscation:
- use tor
- use a privacy-focussed vpn
getting balances & sending transactions:
- run your own node
https://electrum.coincollect.cc/api/getbalance?port=10001&ip=electrum2.cipig.net&proto=tcp&address=YOUR_ADDRESS
on wallets
extra anonymity when sending coins:
- use a tumbler:
also known as a coin mixer
- use tumblebit:
a mixer protocol whereby the mixer itself can't link payer to payee
on wallets
on second layer
on second layer
Second layer networks like Lightning & Raiden Network work for enhanced anonymity.
Payments are aggregated off chain and details are learned only by people directly involved.
Still, network analysis can be done, just like in TOR.
Expect Lightning/Raiden to function as a Jumblr.
- own your own funds
- don't reuse addresses
- use privacy coins or protocols
- know how your wallet works
- if you swap from coin to coin, use a DEX
summary
blockchain & privacy
blockbar @bartroorda 2019-01-31
Blockchain & Privacy
By Bart
