flacko

flacko

researching blockchain security

@flacko

78

resident

Public earnings

$31,659.79

79th


Public findings

16

Biography

AreaCompetence
Solidity / EVM⚡️⚡️⚡️⚡️️️⚡️
Golang / Cosmos / Geth⚡️⚡️⚡️
Rust⚡️

Bug bounties

DateProtocol(s)SeverityWrite-upType
Dec 20242 Projects (Confidential)MediumSoonAccount nonce reuse

Contests

ProtocolFindings (Unique)ReportTypePlatformDetails
Size CreditMedium - 1 (1)LinkSolidityCantina🥉3
NoyaHigh - 7 (1), Medium - 7PrivateSolidityCode4rena🏅4
NibiruMedium - 3 (1)LinkCosmos SDKCode4rena🏅5
OmniHigh - 2, Medium - 1LinkCosmos SDKCantina-
SymbioticMedium - 1LinkSolidityCantina-
FlayerHigh - 3, Medium - 1 (1)LinkSoliditySherlock-
VelocimeterMedium - 2LinkSoliditySherlock-
Size CreditHigh - 1, Medium - 2LinkSolidityCode4rena-
ZivoeHigh - 1, Medium - 1LinkSoliditySherlock-
AxisFinanceHigh - 1, Medium - 1LinkSoliditySherlock-

Research

  1. Safe multisig with restricted actions guard CTF write-up
  2. Dynamic sized arrays in Solidity
  3. Understanding the math behind gas safety checks around the 63/64 rule
  4. A walkthrough of the HYPR bridge hack

Top competitions

View all
Contest
Position
Date
Payout
Omni Network

Omni Network

11

/ 419

October 2024$24,067
size-solidity

size-solidity

3

/ 330

February 2025$4,428
story-protocol

story-protocol

46

/ 572

December 2024$2,831
symbioticfi-core

symbioticfi-core

24

/ 416

September 2024$212
daao-contracts

daao-contracts

33

/ 292

January 2025$123

Public earnings

$31,659.79

79th


Public findings

16