Cashu: Ecash 🥜 + ⚡
nuts   and   bolts
- Open source dev (BoB resident)
- Cashu: ecash protocol
- cashu-ts, nutstash, proxnut...
What is ecash?
What is it good for?
What is ecash?
What is it (not) good for?
What is ecash?
What is ecash?
No Ledger
Distributed Ledger
What is ecash?
No Ledger
Distributed Ledger
Bearer Token
UTXO
What is ecash?
No Ledger
Distributed Ledger
Bearer Token
UTXO
Public transactions
Blinded transactions
What is ecash?
No Ledger
Distributed Ledger
Bearer Token
UTXO
Public transactions
Blinded transactions
Decentralized Blockchain
Centralized verification
What is ecash?
No Ledger
Distributed Ledger
Bearer Token
UTXO
Public transactions
Blinded transactions
Decentralized Blockchain
Centralized verification
Trusted
Trustless
What is ecash?
No Ledger
Distributed Ledger
Bearer Token
UTXO
Public transactions
Blinded transactions
Decentralized Blockchain
Centralized verification
Trusted
Trustless
Ephemeral transactions
Eternal transactions
What is ecash?
No Ledger
Distributed Ledger
Bearer Token
UTXO
Public transactions
Blinded transactions
Decentralized Blockchain
Centralized verification
Trusted
Trustless
Ephemeral transactions
Eternal transactions
|
 |
|---|
|
 |
|---|
How?
Why?
traditional custodial setup
Alice
Bob
Charlie
Alice
Bob
Charlie
| Sender | Amount | Receiver |
|---|---|---|
| Alice | 10$ | Bob |
| User | Balance |
|---|---|
| Alice | 20$ |
| Bob | 10$ |
| Charlie | 0$ |
Alice
Bob
Charlie
| Sender | Amount | Receiver |
|---|---|---|
| Alice | 10$ | Bob |
| Bob | 5$ | Charlie |
| User | Balance |
|---|---|
| Alice | 20$ |
| Bob | 5$ |
| Charlie | 5$ |
Alice
Bob
Charlie
Authorize
What's wrong?
- Horrible privacy
- Easy to target/censor individuals
- Data honey-pot
ecash custodial setup
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
Only Alice can open
Carbon paper
| Spent secrets |
|---|
Alice
Bob
Charlie
secret
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie
| Spent secrets |
|---|
Alice
Bob
Charlie