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Author Topic: [ANN] Challenge: Bypass the Cash File with On-Chain Deposits.  (Read 51 times)
paqus (OP)
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July 24, 2026, 04:44:54 PM
 #1


Cash:

100_1D9EBD333B37A14A.XPQ

100_3A97F811D9666AF7.XPQ

100_9D30AD3B77535B4A.XPQ

100_29C95CCC2776559A.XPQ

100_244DE854E3A71E7A.XPQ

go to github : https://github.com/paqusprotocol/wallet

git clone https://github.com/paqusprotocol/wallet.git

go to wallet folder/repo

cargo run

Paqus Wallet CLI
1. Create wallet
2. Show wallet address
3. Check wallet balance
4. Global chain stats
5. Send coin
6. QCash
7. RPC health
8. RPC status
9. RPC peers
10. RPC chain
11. Latest blocks
12. Block by height
13. Block by hash
14. Transaction by hash
15. Address explorer
16. Accounts
17. Mempool
18. Hashrate
19. Change RPC for this session
20. Exit


select no 6 QCash

QCash
1. Withdraw XPQ to cash files
2. Deposit cash file
3. Inspect cash file
4. Sync lifecycle
5. List cash vault
6. Backup cash vault
7. Recover cash vault
8. Track file name on explorer


select no 2 Deposit cash file

Cash file (.XPQ) (b/back to menu): 100_1D9EBD333B37A14A.XPQ
Recipient (b/back to menu) [wallet.json]:
Signing wallet (b/back to menu) [wallet.json]:



Success Criteria
Successfully deposit one or more provided Cash files using the official Paqus Wallet CLI.
Demonstrate a method to bypass the Cash file deposit mechanism by performing a direct on-chain deposit.
Document the steps taken, expected behavior, actual behavior, and the security impact.
If a vulnerability is found, include a proof of concept (PoC) and explain how it can be reproduced.

Good luck, and happy hacking!
paqus (OP)
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July 25, 2026, 01:52:45 AM
 #2

UPDATE

QCash file status
Status        : spendable
File          : 100_1D9EBD333B37A14A.XPQ
Denomination  : 100 XPQ
Short coin id : 1D9EBD333B37A14A
Coin id       : 1d9ebd333b37a14aef76c1c393017831c49f72202a576ff5b8eaa35c721aef0e
Node height   : 370
Issued height : 220
Maturity      : height 270
Remaining     : 0 block(s)
Output index  : 6
Withdraw tx   : 90fcb92d5d0eae119668dff3124c65fb5ad2f86bde1ddc8cfa60c89456430960
Withdrawer    : PX162VDAY3DJMHLX9M7PRR70R5J73AGL8HVEGQEJN
Matches       : 1

Status        : spendable
File          : 100_3A97F811D9666AF7.XPQ
Denomination  : 100 XPQ
Short coin id : 3A97F811D9666AF7
Coin id       : 3a97f811d9666af7c99cde1f253885e9daf1784f18485a5dabc457e2c5d2081d
Node height   : 371
Issued height : 220
Maturity      : height 270
Remaining     : 0 block(s)
Output index  : 7
Withdraw tx   : 90fcb92d5d0eae119668dff3124c65fb5ad2f86bde1ddc8cfa60c89456430960
Withdrawer    : PX162VDAY3DJMHLX9M7PRR70R5J73AGL8HVEGQEJN
Matches       : 1


QCash file status
Status        : spendable
File          : 100_9D30AD3B77535B4A.XPQ
Denomination  : 100 XPQ
Short coin id : 9D30AD3B77535B4A
Coin id       : 9d30ad3b77535b4ac9458112015a0e4932012cb37a9790662caf48f49e5fc6df
Node height   : 371
Issued height : 220
Maturity      : height 270
Remaining     : 0 block(s)
Output index  : 9
Withdraw tx   : 90fcb92d5d0eae119668dff3124c65fb5ad2f86bde1ddc8cfa60c89456430960
Withdrawer    : PX162VDAY3DJMHLX9M7PRR70R5J73AGL8HVEGQEJN
Matches       : 1


QCash file status
Status        : spendable
File          : 100_29C95CCC2776559A.XPQ
Denomination  : 100 XPQ
Short coin id : 29C95CCC2776559A
Coin id       : 29c95ccc2776559ae2dd8ea97a8adaa0c6573e273b03c4b885b70b4a6b596ac9
Node height   : 371
Issued height : 220
Maturity      : height 270
Remaining     : 0 block(s)
Output index  : 2
Withdraw tx   : 90fcb92d5d0eae119668dff3124c65fb5ad2f86bde1ddc8cfa60c89456430960
Withdrawer    : PX162VDAY3DJMHLX9M7PRR70R5J73AGL8HVEGQEJN
Matches       : 1


QCash file status
Status        : spendable
File          : 100_244DE854E3A71E7A.XPQ
Denomination  : 100 XPQ
Short coin id : 244DE854E3A71E7A
Coin id       : 244de854e3a71e7a2c789e0511ef1d053ae7d498f75840a0321389a9e954003b
Node height   : 371
Issued height : 220
Maturity      : height 270
Remaining     : 0 block(s)
Output index  : 5
Withdraw tx   : 90fcb92d5d0eae119668dff3124c65fb5ad2f86bde1ddc8cfa60c89456430960
Withdrawer    : PX162VDAY3DJMHLX9M7PRR70R5J73AGL8HVEGQEJN
Matches       : 1
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