Secured  by Bitcoin.

All Stacks transactions settle to Bitcoin. On top of that base layer security, the network and sBTC's 1:1 bitcoin backing are maintained by an independent signer set, reviewed by outside auditors, and continuously tested through a $1M+ public bug bounty on Immunefi.

437

M+

Bitcoin secured in sBTC

Community elected signer consensus to move sBTC

250

Public bug bounty with Immunefi

Anchored to Bitcoin

Through Proof of Transfer, every Stacks transaction gets settled on Bitcoin, so the network inherits Bitcoin's security.

STACKS L2

BITCOIN L1

#8377505

<1 minute ago

2 txs

#954986

~1 hour ago

84 Stacks blocks

#8377505

<1 minute ago

3 txs

#954986

~1 hour ago

38 STX blocks

#8377506

<1 minute ago

1 txs

#954987

~1 hour ago

93 STX blocks

#8377507

<1 minute ago

2 txs

#954988

~1 hour ago

84 STX blocks

STACKS L2

BITCOIN L1

#8377505

<1 minute ago

2 txs

#954986

~1 hour ago

84 Stacks blocks

#8377505

<1 minute ago

3 txs

#954986

~1 hour ago

38 STX blocks

#8377505

<1 minute ago

1 txs

#954987

~1 hour ago

93 STX blocks

#8377505

<1 minute ago

2 txs

#954986

~1 hour ago

84 STX blocks

Since the Nakamoto upgrade, Stacks transactions reach Bitcoin finality. Reversing a confirmed Stacks block would require reorganizing Bitcoin itself.

Signers

Two independent signer roles secure Stacks: network signers finalize every block, and sBTC signers safeguard the bitcoin that backs sBTC 1:1.

Network Signers: Chain Security

Every Stacks block is signed by STX stackers. A block is final once signers representing 70% of all stacked STX approve it. The role is open and permissionless: anyone meeting the stacking minimum can run a signer.

[ VIEW ACTIVE SIGNERS ↗ ]

sBTC Signers

sBTC's 1:1 bitcoin backing is held by a set of 14 community-elected infrastructure operators, chosen through a public SIP-028 vote. Moving that bitcoin requires approval from 70% of signers, so no single operator, or small group, can act alone.

The sBTC 1:1 bitcoin backing is currently maintained by:

Institutional-grade custody

Hold Stacks assets through the qualified custodians institutions already use.

Audited and battle-tested

Stacks Core and sBTC are audited by independent firms, and security is continuous. Backed by a public Immunefi bug bounty.

Read all audit reports

Secure by design. Clarity, the Stacks smart contract language, is built to be predictable and hard to exploit.

DECIDABLE

Not Turing complete, so you can verify everything a contract can and can't do before it runs.

NO REENTRANCY

Calls are explicit and known at deploy time. A contract can't be re-entered mid execution, closing the exploit class behind many of DeFi's largest hacks.

POST CONDITIONS

Transactions abort if asset movements don't match what was declared, so even a buggy or malicious contract can't take more than you approved.

Secured by Bitcoin.

Anchored to Bitcoin

Signers

Network Signers: Chain Security

sBTC Signers

Secure by design. Clarity, the Stacks smart contract language, is built to be predictable and hard to exploit.

Found a vulnerability?

Secured  by Bitcoin.

Secure by design. Clarity, the Stacks smart contract language, is built to be predictable and hard to exploit.