Release notes

What is live on Solana mainnet today, and the hashes you can check yourself.

Program


Program ID	`zh1eLd6rSphLejbFfJEneUwzHRfMKxgzrgkfwA6qRkW`
Deployed artifact	SBF ELF, sha256 `d0f68613a08d7e0913aea67d95f04598bc070911a0e84fedd43cc6bfa18e6cf6`, 239,032 bytes
Live since	2026-08-24
Upgrade authority	Squads multisig vault `F6HWeX5i2KjYQag6wCtxzQXeGewv6vXZihZR3EWdRL7s` (3-of-4, 1-hour time lock)

The program has undergone an independent security audit, and the deployed bytecode is built from the audited release.

Verifying key and circuits

The transaction circuit’s verifying key comes from the multi-party trusted-setup ceremony cloak-transaction-0.2.0 (6 named contributors plus a public final beacon). The circuit has 42,672 constraints and 9 public inputs.

Artifact	sha256
`transaction.vkey.bin` (the key the program verifies against)	`d65073d44064ed3be10d79e52d60a06d6be6d6c01afcd5ce52cdfcfc97c5585d`
`transaction.vkey.json` (exported)	`deb40e7b94eae17db2975d23dcf26c26db2a36a4f02d14a25830dee3e88fb93c`
`transaction_final.zkey`	`9da7db8cb1370fc497d36a0365f1f107ab0b0c13ca66fa9f0287e5f96ee68d25`
`transaction_js/transaction.wasm`	`02ec02e954ae3932827ad9de51afa597ca95569aa97fec8410879c937a58aa2b`

Proving artifacts are published at https://storage.googleapis.com/cloak-circuits/circuits/0.2.0/. The older circuits/0.1.0 artifacts are no longer accepted; proofs built from them fail on-chain.

Verify it yourself

# 1. Hash the deployed program (the ProgramData account is padded; hash the first 239,032 bytes)
solana program dump -u m zh1eLd6rSphLejbFfJEneUwzHRfMKxgzrgkfwA6qRkW /tmp/cloak.so \
  && head -c 239032 /tmp/cloak.so | shasum -a 256
# expect d0f68613a08d7e0913aea67d95f04598bc070911a0e84fedd43cc6bfa18e6cf6

# 2. Hash the proving artifacts
B=https://storage.googleapis.com/cloak-circuits/circuits/0.2.0
curl -sL $B/transaction_final.zkey          | shasum -a 256   # 9da7db8c…68d25
curl -sL $B/transaction_js/transaction.wasm | shasum -a 256   # 02ec02e9…8aa2b

# 3. Compare with the table above. The SDK runs the same digest check before every proof.

Fees and minimums

Fees are enforced on-chain by the program from a per-pool PoolConfig. Nothing else in the system charges a fee.

Pool	Fixed fee	Variable fee	Minimum deposit
SOL	0.005 SOL	0.3%	0.01 SOL
USDC	0.45 USDC	0.3%	1.00 USDC
USDT	0.45 USDT	0.3%	1.00 USDT

Fees apply to withdrawals and swaps only. Deposits and private sends carry no protocol fee (network fees only). Full breakdown: Fee model.

Compliance

Deposits are risk-screened on-chain: a signed risk quote is bound to the deposit and checked by the program.
Withdrawals and swaps use a signed withdraw authorization issued after off-chain screening; the withdraw authorizer is set per pool.
Viewing keys let a user disclose their own history to an auditor. See Compliance.

SDK — current release `0.2.5`

Published 2026-09-17. The program, the verifying key and the circuits/0.2.0 bundle did not change with it; 0.2.5 is a client-side release.

Built on @solana/kit. connection is a CloakRpc from createCloakRpc(rpcUrl), addresses are Kit Address strings, and depositorKeypair is a KeyPairSigner. @solana/web3.js is an optional peer dependency used by the wallet-adapter bridge. Migration table: Solana Kit integration.
Batch signing. transactBatch runs N private spends behind one wallet approval. See Batch signing.
Bridging in. SDK surface for bringing USDC in from another chain. See Bridging in.
One-signature SPL deposits. The opt-in relaySupplementalAlt option means an SPL deposit that needs a supplemental lookup table asks the user to sign once instead of twice.
Removed in 0.2.5: keypairToAdapter and the WalletAdapter type. RelayAuthSigner is now a Kit signer, built with messageSignerFromCallback.

Supported mainnet flows: shield, private send, unshield and private swap on SOL, USDC and USDT, with swaps routed through Jupiter.

npm install @cloak.dev/sdk@0.2.5 @solana/kit

Getting Started

Platform

SDK

Programs

Packages

Releases

Operations

Program

Verifying key and circuits

Verify it yourself

Fees and minimums

Compliance

SDK — current release `0.2.5`

​Program

​Verifying key and circuits

​Verify it yourself

​Fees and minimums

​Compliance

​SDK — current release 0.2.5

Program

Verifying key and circuits

Verify it yourself

Fees and minimums

Compliance

SDK — current release `0.2.5`