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Putty contest - 0v3rf10w's results

An order-book based american options market for NFTs and ERC20s.

General Information

Platform: Code4rena

Start Date: 29/06/2022

Pot Size: $50,000 USDC

Total HM: 20

Participants: 133

Period: 5 days

Judge: hickuphh3

Total Solo HM: 1

Id: 142

League: ETH

Putty

Findings Distribution

Researcher Performance

Rank: 112/133

Findings: 1

Award: $21.17

🌟 Selected for report: 0

🚀 Solo Findings: 0

External Links

Code4rena Contest PageGithub Contest RepositoryGithub Findings RepositoryPutty

Findings Information

🌟 Selected for report: GalloDaSballo

Also found by: 0v3rf10w, 0x1f8b, 0xA5DF, 0xDjango, 0xHarry, 0xKitsune, 0xNazgul, 0xNineDec, 0xc0ffEE, 0xf15ers, 0xkatana, 0xsanson, ACai, Aymen0909, Bnke0x0, BowTiedWardens, Chom, ElKu, Fitraldys, Funen, Haruxe, Hawkeye, IllIllI, JC, JohnSmith, Kaiziron, Kenshin, Lambda, Limbooo, MadWookie, Metatron, MiloTruck, Picodes, PwnedNoMore, Randyyy, RedOneN, ReyAdmirado, Ruhum, Sm4rty, StErMi, StyxRave, TerrierLover, TomJ, Tomio, UnusualTurtle, Waze, Yiko, _Adam, __141345__, ajtra, ak1, apostle0x01, asutorufos, c3phas, cRat1st0s, catchup, codetilda, cryptphi, datapunk, defsec, delfin454000, durianSausage, exd0tpy, fatherOfBlocks, gogo, grrwahrr, hake, hansfriese, horsefacts, ignacio, jayfromthe13th, joestakey, ladboy233, m_Rassska, mektigboy, minhquanym, mrpathfindr, natzuu, oyc_109, rajatbeladiya, reassor, rfa, robee, rokinot, sach1r0, saian, sashik_eth, simon135, slywaters, swit, z3s, zeesaw, zer0dot

Awards

21.1707 USDC - $21.17

Labels

bug
G (Gas Optimization)

External Links

Link to GitHub issue

GAS1 : gas savings in loops:

  1. use prefix ++i instead of suffix
  2. also use unchecked{}
  3. <array>.length should not be looked up in every loop of a for-loop, instead cache it before.

https://github.com/code-423n4/2022-06-putty/blob/3b6b844bc39e897bd0bbb69897f2deff12dc3893/contracts/src/PuttyV2.sol#L594-L595

https://github.com/code-423n4/2022-06-putty/blob/3b6b844bc39e897bd0bbb69897f2deff12dc3893/contracts/src/PuttyV2.sol#L556-L557

https://github.com/code-423n4/2022-06-putty/blob/3b6b844bc39e897bd0bbb69897f2deff12dc3893/contracts/src/PuttyV2.sol#L611-L612

  • every other helper function

GAS2 : use calldata instead of memory to save gas

https://github.com/code-423n4/2022-06-putty/blob/3b6b844bc39e897bd0bbb69897f2deff12dc3893/contracts/src/PuttyV2.sol#L271-L272

GAS3 : Use custom errors rather than revert()/require() strings to save deployment gas

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