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Custom zk-circuit design specialized for custody events:

• Deposit

• Withdrawal

• Settlement

• Cross-asset swap

• Bridged transfer

Each event emits a succinct proof validated on public chain.

Beneath the execution layer lies a vast encrypted structure: a Sparse Merkle Tree, but not like any traditional account ledger. Here, each leaf is a cryptographic artifact:

• A hidden balance commitment

• A masked identity hash

• A rotating nonce binding the two

• An encrypted auxiliary state

Balances do not exist as numbers.
Identities do not exist as addresses.
Instead, everything is stored as sealed commitments, each one indistinguishable from noise.

Privacy requires invisibility.
Integrity requires enforcement.
SpotLab solves this paradox using a cryptographic sentinel:
the Nullifier Engine. Whenever an internal note (a hidden balance) is consumed either through transfer, swap, or withdrawal SpotLab emits a nullifier, a hashed, salted, anonymous fingerprint.

In SpotLab, users do not sign transactions. Instead, they construct zk-Intent Blobs proof-driven authorizations that:

• Confirm ownership of hidden balances

• Assert the right to perform an action

• Bind the action to a one-time nonce

• Keep the private key fully sealed

The chain never sees the user. Never sees a public key. Never sees a signature. Never sees an address.

SpotLab does not verify proofs alone. It is amplified by the x402 verification architecture a network of parallel verifiers that break proofs into fragments, process them concurrently, and reunify them into a single commitment. This mesh gives SpotLab superpowers:

• Massive batch settlement

• Microsecond-level auditing

• Instant settlement finality

• Cross-chain zk-bridging

A custody system must do more than hide. It must also prove it is honest.

SpotLab integrates a zk-Solvency Framework, allowing the system to demonstrate:

• All assets exist

• All liabilities match

• No hidden debt

• No fractional reserve

• No manipulation of balances