diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..2bc0c9a
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,43 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  ci:
+    name: Check & Test
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - uses: Swatinem/rust-cache@v2
+
+      - name: Install Solana CLI
+        run: |
+          sh -c "$(curl -sSfL https://release.anza.xyz/v2.3.0/install)"
+          echo "$HOME/.local/share/solana/install/active_release/bin" >> $GITHUB_PATH
+
+      - run: cargo install --git https://github.com/coral-xyz/anchor avm --force
+      - run: avm install 0.32.1 && avm use 0.32.1
+
+      - run: npm ci
+      - run: anchor build
+      - run: npm run check
+
+      - name: Generate keypair
+        run: solana-keygen new --no-bip39-passphrase --force
+
+      - run: anchor test --skip-build
diff --git a/README.md b/README.md
index 29c7a75..a340ec3 100644
--- a/README.md
+++ b/README.md
@@ -9,37 +9,51 @@ Built with [Anchor](https://www.anchor-lang.com/) 0.32.
 
 ## How it works
 
+### Direct signing (local ETH key)
+
+1. **Build** inner instructions off-chain (SPL transfers, swaps, etc.)
+2. **Compute** the message hash (see [below](#message-hash))
+3. **Sign** the hash with an ETH private key → `(signature, recovery_id)`
+4. **Submit** the Solana tx with the signature + indexed inner instructions
+5. **On-chain** — the program verifies the ECDSA signature, recovers the ETH address, asserts the nonce, and executes each inner instruction as a CPI from the PDA
+
+### MPC signing (via [Signet](https://docs.sig.network) network)
+
+Instead of a local private key, an EVM wallet requests a distributed signature from the [Signet MPC network](https://docs.sig.network). The on-chain program does not distinguish between local-key and MPC signatures — verification is identical.
+
+1. **Derive** an ETH address from the MPC network using a derivation path
+2. **Initialize** the wallet PDA on Solana with that derived address
+3. **Build** inner instructions + compute the message hash (same as direct signing)
+4. **Request** a signature via `createSignatureRequest(hash, path)` on the Signet `ChainSignatureContract` (Sepolia) — the MPC network produces `(r, s, v)`
+5. **Submit** the signature to the Solana program
+6. **On-chain** — identical verification: ECDSA recovery, address comparison, nonce check, CPI dispatch
+
+See the [Signet docs](https://docs.sig.network) for more on chain signatures and MPC key derivation. The MPC test (`tests/mpc-ecdsa-proxy.ts`) requires Sepolia and Solana devnet credentials via environment variables.
+
+### Message hash
+
+Both paths produce the same hash structure:
+
 ```
-┌──────────────────────────────────────────────────────────────────────────┐
-│  Off-chain (Client)                                                      │
-│                                                                          │
-│  1. Build inner instructions (SPL transfers, swaps, etc.)                │
-│  2. Compute message hash:                                                │
-│       keccak256(                                                         │
-│         "\x19Ethereum Signed Message:\n32" ||                            │
-│         keccak256(chain_id || program_id || nonce ||                     │
-│                   keccak256(remaining_accounts) ||                       │
-│                   keccak256(borsh(inner_instructions)))                  │
-│       )                                                                  │
-│  3. Sign with ETH private key → (signature, recovery_id)                │
-│  4. Submit Solana tx with signature + indexed inner instructions         │
-└─────────────────────────────────┬────────────────────────────────────────┘
-                                  │
-                                  ▼
-┌──────────────────────────────────────────────────────────────────────────┐
-│  On-chain (Solana Program)                                               │
-│                                                                          │
-│  1. Assert nonce == wallet_state.nonce                                   │
-│  2. Reject high-S signatures (malleability)                              │
-│  3. Recompute message hash from tx data                                  │
-│  4. secp256k1_recover(hash, signature, recovery_id) → pubkey            │
-│  5. keccak256(pubkey)[12..] → recovered ETH address                     │
-│  6. Assert recovered address == wallet_state.eth_address                 │
-│  7. Increment nonce                                                      │
-│  8. invoke_signed() each inner instruction with PDA as signer            │
-└──────────────────────────────────────────────────────────────────────────┘
+keccak256(
+  "\x19Ethereum Signed Message:\n32" ||
+  keccak256(chain_id || program_id || nonce ||
+            keccak256(remaining_accounts) ||
+            keccak256(borsh(inner_instructions)))
+)
 ```
 
+### On-chain verification
+
+1. Assert `nonce == wallet_state.nonce`
+2. Reject high-S signatures (malleability)
+3. Recompute message hash from tx data
+4. `secp256k1_recover(hash, signature, recovery_id)` → pubkey
+5. `keccak256(pubkey)[12..]` → recovered ETH address
+6. Assert recovered address == `wallet_state.eth_address`
+7. Increment nonce
+8. `invoke_signed()` each inner instruction with PDA as signer
+
 ## Instructions
 
 | Instruction | Discriminator | Description |
@@ -98,8 +112,11 @@ programs/ecdsa-proxy/src/
     └── close_wallet.rs
 
 tests/
-├── ecdsa-proxy.ts          # Integration tests
-└── helpers/evm-signer.ts   # TypeScript signing (mirrors on-chain hashing)
+├── ecdsa-proxy.ts          # Integration tests (local key)
+├── mpc-ecdsa-proxy.ts      # Integration tests (MPC signing via Sepolia)
+└── helpers/
+    ├── evm-signer.ts       # TypeScript signing (mirrors on-chain hashing)
+    └── mpc-signer.ts       # MPC signer using signet.js ChainSignatureContract
 ```
 
 ## License
diff --git a/package-lock.json b/package-lock.json
index a6799a2..5847ea8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -21,59 +21,13 @@
         "knip": "^5.86.0",
         "mocha": "^11.7.5",
         "prettier": "^3.8.1",
-        "signet.js": "^0.3.1",
+        "signet.js": "^0.4.0",
         "ts-mocha": "^11.1.0",
         "typescript": "^5.9.3",
         "typescript-eslint": "^8.57.0",
         "viem": "^2.47.4"
       }
     },
-    "../signet.js": {
-      "version": "0.3.2",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@coral-xyz/anchor": "^0.31.0",
-        "@cosmjs/amino": "^0.32.4",
-        "@cosmjs/crypto": "^0.32.4",
-        "@cosmjs/encoding": "^0.32.4",
-        "@cosmjs/math": "^0.32.4",
-        "@cosmjs/proto-signing": "^0.32.4",
-        "@cosmjs/stargate": "^0.32.4",
-        "@scure/base": "^1.2.4",
-        "@solana/web3.js": "^1.98.0",
-        "bech32": "^2.0.0",
-        "bitcoinjs-lib": "^6.1.5",
-        "bn.js": "^5.2.1",
-        "chain-registry": "^1.69.72",
-        "coinselect": "^3.1.13",
-        "cosmjs-types": "^0.9.0",
-        "elliptic": "^6.6.1",
-        "viem": "^2.22.14"
-      },
-      "devDependencies": {
-        "@eslint/js": "^9.18.0",
-        "@noble/curves": "^1.8.1",
-        "@nomicfoundation/hardhat-toolbox": "^5.0.0",
-        "@types/bn.js": "^5.1.5",
-        "@types/elliptic": "^6.4.18",
-        "@types/node": "^22.10.10",
-        "@types/react": "^19.0.0",
-        "dotenv": "^16.4.5",
-        "eslint": "^9.18.0",
-        "eslint-config-prettier": "^10.0.0",
-        "eslint-plugin-import-x": "^4.6.0",
-        "hardhat": "^2.22.18",
-        "prettier": "^3.8.0",
-        "react": "^19.0.0",
-        "react-dom": "^19.0.0",
-        "tsdown": "^0.16.6",
-        "typescript": "^5.9.3",
-        "typescript-eslint": "^8.21.0",
-        "vitest": "^3.0.4",
-        "vocs": "^1.4.1"
-      }
-    },
     "node_modules/@adraffy/ens-normalize": {
       "version": "1.11.1",
       "resolved": "https://registry.npmjs.org/@adraffy/ens-normalize/-/ens-normalize-1.11.1.tgz",
@@ -90,6 +44,13 @@
         "node": ">=6.9.0"
       }
     },
+    "node_modules/@chain-registry/types": {
+      "version": "2.0.169",
+      "resolved": "https://registry.npmjs.org/@chain-registry/types/-/types-2.0.169.tgz",
+      "integrity": "sha512-v0+mDWktDpzBRYQQYcl/fcFcoIJHmFImz/2l/UVJj9NibuX08M1hhYAu44H/nBieDpCdvTgW7Q+bVwZmWlR4gQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@coral-xyz/anchor": {
       "version": "0.32.1",
       "resolved": "https://registry.npmjs.org/@coral-xyz/anchor/-/anchor-0.32.1.tgz",
@@ -139,6 +100,156 @@
         "@solana/web3.js": "^1.69.0"
       }
     },
+    "node_modules/@cosmjs/amino": {
+      "version": "0.38.1",
+      "resolved": "https://registry.npmjs.org/@cosmjs/amino/-/amino-0.38.1.tgz",
+      "integrity": "sha512-WaThDpq2JwUyKuazq08Xa+FHzQ3jh1HcYnGL4xsyfqFwOlAvnl0EDvSSz9WSwz1oopIxFE9Qtf3OUKOlxBZbYA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@cosmjs/crypto": "^0.38.1",
+        "@cosmjs/encoding": "^0.38.1",
+        "@cosmjs/math": "^0.38.1",
+        "@cosmjs/utils": "^0.38.1"
+      }
+    },
+    "node_modules/@cosmjs/crypto": {
+      "version": "0.38.1",
+      "resolved": "https://registry.npmjs.org/@cosmjs/crypto/-/crypto-0.38.1.tgz",
+      "integrity": "sha512-r1KQCjKAdMga2aZ/nkgULRF4fisPZMF6ErucVsMmkASBgDl0k9/vD9K9fHUdGClMv0oOYEfwOT/UTBR7K2OuYA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@cosmjs/encoding": "^0.38.1",
+        "@cosmjs/math": "^0.38.1",
+        "@cosmjs/utils": "^0.38.1",
+        "@noble/ciphers": "^1.3.0",
+        "@noble/curves": "^1.9.2",
+        "@noble/hashes": "^1.8.0",
+        "@scure/bip39": "^1.6.0",
+        "hash-wasm": "^4.12.0"
+      }
+    },
+    "node_modules/@cosmjs/encoding": {
+      "version": "0.38.1",
+      "resolved": "https://registry.npmjs.org/@cosmjs/encoding/-/encoding-0.38.1.tgz",
+      "integrity": "sha512-i5jGgJhiXs7boePGA48xzYxnCbf3MS5nT/R2HvnvSQyVAG2A99NyL96lBgmz6etOJSGOiwVrB8uh1Qp5bq6WKQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@scure/base": "^2.0.0",
+        "base64-js": "^1.3.0",
+        "readonly-date-esm": "^2.0.0"
+      }
+    },
+    "node_modules/@cosmjs/encoding/node_modules/@scure/base": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@scure/base/-/base-2.0.0.tgz",
+      "integrity": "sha512-3E1kpuZginKkek01ovG8krQ0Z44E3DHPjc5S2rjJw9lZn3KSQOs8S7wqikF/AH7iRanHypj85uGyxk0XAyC37w==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@cosmjs/json-rpc": {
+      "version": "0.38.1",
+      "resolved": "https://registry.npmjs.org/@cosmjs/json-rpc/-/json-rpc-0.38.1.tgz",
+      "integrity": "sha512-h+ejJeh+Men8upheRcIETGLAGhsGzIQW03BFvCsCenQOoewpxnbxN1mjfLE7M8UtOTNUsb0uQ1yEnhaTKPTRPg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@cosmjs/stream": "^0.38.1",
+        "xstream": "^11.14.0"
+      }
+    },
+    "node_modules/@cosmjs/math": {
+      "version": "0.38.1",
+      "resolved": "https://registry.npmjs.org/@cosmjs/math/-/math-0.38.1.tgz",
+      "integrity": "sha512-MBk7p6kPNULi0TusD8O3xoBskFIkRzOtpmnea3sXbTVnguX7epNPVDITXM4tlsg8kAQrEOEIA0g5zAJxzH3Ikw==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
+    "node_modules/@cosmjs/proto-signing": {
+      "version": "0.38.1",
+      "resolved": "https://registry.npmjs.org/@cosmjs/proto-signing/-/proto-signing-0.38.1.tgz",
+      "integrity": "sha512-J7jELTwk39wYAZUan48eTLBKzx3/max1NIQSlaerdrUkIqhk9ZzC2+p94RnlFUBkvsWZ4ORbhNLYPjwuf2oM0g==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@cosmjs/amino": "^0.38.1",
+        "@cosmjs/crypto": "^0.38.1",
+        "@cosmjs/encoding": "^0.38.1",
+        "@cosmjs/math": "^0.38.1",
+        "@cosmjs/utils": "^0.38.1",
+        "cosmjs-types": "^0.11.0"
+      }
+    },
+    "node_modules/@cosmjs/socket": {
+      "version": "0.38.1",
+      "resolved": "https://registry.npmjs.org/@cosmjs/socket/-/socket-0.38.1.tgz",
+      "integrity": "sha512-r58RplrHOoO9oDCPiFZu+oBTgeTqE6/HMW+JSAko2Dyv3AocdPhBV16SJQriumGxVRmFUdcczkK2L+6OwngoOA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@cosmjs/stream": "^0.38.1",
+        "isomorphic-ws": "^4.0.1",
+        "ws": "^7",
+        "xstream": "^11.14.0"
+      }
+    },
+    "node_modules/@cosmjs/stargate": {
+      "version": "0.38.1",
+      "resolved": "https://registry.npmjs.org/@cosmjs/stargate/-/stargate-0.38.1.tgz",
+      "integrity": "sha512-HxLMJxvjN8neJcN382ir1X+nrsmfYYzJ9RpibEOgzN50Ir3D1qW1q6pumjCZb4s834iB0FOlMA1F0LIklaRong==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@cosmjs/amino": "^0.38.1",
+        "@cosmjs/encoding": "^0.38.1",
+        "@cosmjs/math": "^0.38.1",
+        "@cosmjs/proto-signing": "^0.38.1",
+        "@cosmjs/stream": "^0.38.1",
+        "@cosmjs/tendermint-rpc": "^0.38.1",
+        "@cosmjs/utils": "^0.38.1",
+        "cosmjs-types": "^0.11.0"
+      }
+    },
+    "node_modules/@cosmjs/stream": {
+      "version": "0.38.1",
+      "resolved": "https://registry.npmjs.org/@cosmjs/stream/-/stream-0.38.1.tgz",
+      "integrity": "sha512-YIruJ6XfPQooMZzy7fTMx1/JnAMgiGMg785Zxja+RntbxrsHyWYUdWGi9ji8uOHEgZNYErHlK2NnbF8VlCo1ew==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "xstream": "^11.14.0"
+      }
+    },
+    "node_modules/@cosmjs/tendermint-rpc": {
+      "version": "0.38.1",
+      "resolved": "https://registry.npmjs.org/@cosmjs/tendermint-rpc/-/tendermint-rpc-0.38.1.tgz",
+      "integrity": "sha512-yoGfI1wcw986qqCJkD544HXB4YxVOvne5s1RZkO437RtgvpLgVVdTBvCB1JcgLDw25gpHMFe1dWe5Sn9LPzQxA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@cosmjs/crypto": "^0.38.1",
+        "@cosmjs/encoding": "^0.38.1",
+        "@cosmjs/json-rpc": "^0.38.1",
+        "@cosmjs/math": "^0.38.1",
+        "@cosmjs/socket": "^0.38.1",
+        "@cosmjs/stream": "^0.38.1",
+        "@cosmjs/utils": "^0.38.1",
+        "readonly-date-esm": "^2.0.0",
+        "xstream": "^11.14.0"
+      }
+    },
+    "node_modules/@cosmjs/utils": {
+      "version": "0.38.1",
+      "resolved": "https://registry.npmjs.org/@cosmjs/utils/-/utils-0.38.1.tgz",
+      "integrity": "sha512-ccQ5in6IvsQ+o/SstUdQH1jCJ2+MkJPZK7A/EYwMAFcjV8vzOgJ97LVy6AT24nwdi0/iVa2nbAG+fitUEsgLcA==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
     "node_modules/@cspotcode/source-map-support": {
       "version": "0.8.1",
       "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
@@ -1676,6 +1787,13 @@
       ],
       "license": "MIT"
     },
+    "node_modules/bech32": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/bech32/-/bech32-2.0.0.tgz",
+      "integrity": "sha512-LcknSilhIGatDAsY1ak2I8VtGaHNhgMSYVxFrGLXv+xLHytaKZKcaUJJUE7qmBr7h33o5YQwP55pMI0xmkpJwg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/bigint-buffer": {
       "version": "1.1.5",
       "resolved": "https://registry.npmjs.org/bigint-buffer/-/bigint-buffer-1.1.5.tgz",
@@ -1710,6 +1828,39 @@
         "file-uri-to-path": "1.0.0"
       }
     },
+    "node_modules/bip174": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/bip174/-/bip174-3.0.0.tgz",
+      "integrity": "sha512-N3vz3rqikLEu0d6yQL8GTrSkpYb35NQKWMR7Hlza0lOj6ZOlvQ3Xr7N9Y+JPebaCVoEUHdBeBSuLxcHr71r+Lw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "uint8array-tools": "^0.0.9",
+        "varuint-bitcoin": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
+    "node_modules/bitcoinjs-lib": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/bitcoinjs-lib/-/bitcoinjs-lib-7.0.1.tgz",
+      "integrity": "sha512-vwEmpL5Tpj0I0RBdNkcDMXePoaYSTeKY6mL6/l5esbnTs+jGdPDuLp4NY1hSh6Zk5wSgePygZ4Wx5JJao30Pww==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@noble/hashes": "^1.2.0",
+        "bech32": "^2.0.0",
+        "bip174": "^3.0.0",
+        "bs58check": "^4.0.0",
+        "uint8array-tools": "^0.0.9",
+        "valibot": "^1.2.0",
+        "varuint-bitcoin": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/bn.js": {
       "version": "5.2.3",
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-5.2.3.tgz",
@@ -1769,6 +1920,34 @@
         "base-x": "^3.0.2"
       }
     },
+    "node_modules/bs58check": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/bs58check/-/bs58check-4.0.0.tgz",
+      "integrity": "sha512-FsGDOnFg9aVI9erdriULkd/JjEWONV/lQE5aYziB5PoBsXRind56lh8doIZIc9X4HoxT5x4bLjMWN1/NB8Zp5g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@noble/hashes": "^1.2.0",
+        "bs58": "^6.0.0"
+      }
+    },
+    "node_modules/bs58check/node_modules/base-x": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/base-x/-/base-x-5.0.1.tgz",
+      "integrity": "sha512-M7uio8Zt++eg3jPj+rHMfCC+IuygQHHCOU+IYsVtik6FWjuYpVt/+MRKcgsAMHh8mMFAwnB+Bs+mTrFiXjMzKg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/bs58check/node_modules/bs58": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/bs58/-/bs58-6.0.0.tgz",
+      "integrity": "sha512-PD0wEnEYg6ijszw/u8s+iI3H17cTymlrwkKhDhPZq+Sokl3AU4htyBFTjAeNAlCCmg0f53g6ih3jATyCKftTfw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "base-x": "^5.0.0"
+      }
+    },
     "node_modules/buffer": {
       "version": "6.0.3",
       "resolved": "https://registry.npmjs.org/buffer/-/buffer-6.0.3.tgz",
@@ -1838,6 +2017,16 @@
         "node": ">=18"
       }
     },
+    "node_modules/chain-registry": {
+      "version": "2.0.169",
+      "resolved": "https://registry.npmjs.org/chain-registry/-/chain-registry-2.0.169.tgz",
+      "integrity": "sha512-fC0WWw1igynLN5jEakeFA5SfOaRJj6drQwyXgegrflU2y5jrwiZRdcDcvj0iSZhnu3sRAloYfYaNaS/btAhp+Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@chain-registry/types": "^2.0.169"
+      }
+    },
     "node_modules/chalk": {
       "version": "5.6.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-5.6.2.tgz",
@@ -1960,6 +2149,13 @@
         "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
       }
     },
+    "node_modules/coinselect": {
+      "version": "3.1.13",
+      "resolved": "https://registry.npmjs.org/coinselect/-/coinselect-3.1.13.tgz",
+      "integrity": "sha512-iJOrKH/7N9gX0jRkxgOHuGjvzvoxUMSeylDhH1sHn+CjLjdin5R0Hz2WEBu/jrZV5OrHcm+6DMzxwu9zb5mSZg==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/color-convert": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
@@ -1990,6 +2186,16 @@
         "node": ">=18"
       }
     },
+    "node_modules/cosmjs-types": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/cosmjs-types/-/cosmjs-types-0.11.0.tgz",
+      "integrity": "sha512-kDSkgHpRTrg1413jCNehT3P21+EBxZWFMBr9JEzVfmPiNdtuwAoLAkCYo7c7i/pTakAwyHsXbxOg8kkD+AN33w==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=20.19"
+      }
+    },
     "node_modules/create-require": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/create-require/-/create-require-1.1.1.tgz",
@@ -2060,6 +2266,42 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/define-data-property": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/define-data-property/-/define-data-property-1.1.4.tgz",
+      "integrity": "sha512-rBMvIzlpA8v6E+SJZoo++HAYqsLrkg7MSfIinMPFhmkorw7X+dOXVJQs+QT69zGkzMyfDnIMN2Wid1+NbL3T+A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "es-define-property": "^1.0.0",
+        "es-errors": "^1.3.0",
+        "gopd": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/define-properties": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.2.1.tgz",
+      "integrity": "sha512-8QmQKqEASLd5nx0U1B1okLElbUuuttJ/AnYmRXbbbGDWh6uS208EjD4Xqq/I9wK7u0v6O08XhTWnt5XtEbR6Dg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "define-data-property": "^1.0.1",
+        "has-property-descriptors": "^1.0.0",
+        "object-keys": "^1.1.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/delay": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/delay/-/delay-5.0.0.tgz",
@@ -2109,6 +2351,26 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/es-define-property": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/es-define-property/-/es-define-property-1.0.1.tgz",
+      "integrity": "sha512-e3nRfgfUZ4rNGL232gUgX06QNyyez04KdjFrF+LTRoOXmrOgFKDg4BCdsjW8EnT69eqdYGmRpJwiPVYNrCaW3g==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
+    "node_modules/es-errors": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/es-errors/-/es-errors-1.3.0.tgz",
+      "integrity": "sha512-Zf5H2Kxt2xjTvbJvP2ZWLEICxA6j+hAmMzIlypy4xcBg1vKVnx89Wy0GbS+kf5cwCVFFzdCFh2XSCFNULS6csw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/es6-promise": {
       "version": "4.2.8",
       "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-4.2.8.tgz",
@@ -2621,6 +2883,36 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/globalthis": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/globalthis/-/globalthis-1.0.4.tgz",
+      "integrity": "sha512-DpLKbNU4WylpxJykQujfCcwYWiV/Jhm50Goo0wrVILAv5jOr9d+H+UR3PhSCD2rCCEIg0uc+G+muBTwD54JhDQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "define-properties": "^1.2.1",
+        "gopd": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/gopd": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/gopd/-/gopd-1.2.0.tgz",
+      "integrity": "sha512-ZUKRh6/kUFoAiTAtTYPZJ3hw9wNxx+BIBOijnlG9PnrJsCcSjs1wyyD6vJpaYtgnzDrKYRSqf3OO6Rfa93xsRg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/has-flag": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
@@ -2631,6 +2923,26 @@
         "node": ">=8"
       }
     },
+    "node_modules/has-property-descriptors": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/has-property-descriptors/-/has-property-descriptors-1.0.2.tgz",
+      "integrity": "sha512-55JNKuIW+vq4Ke1BjOTjM2YctQIvCT7GFzHwmfZPGo5wnrgkid0YQtnAleFSqumZm4az3n2BS+erby5ipJdgrg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "es-define-property": "^1.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/hash-wasm": {
+      "version": "4.12.0",
+      "resolved": "https://registry.npmjs.org/hash-wasm/-/hash-wasm-4.12.0.tgz",
+      "integrity": "sha512-+/2B2rYLb48I/evdOIhP+K/DD2ca2fgBjp6O+GBEnCDk2e4rpeXIK8GvIyRPjTezgmWn9gmKwkQjjx6BtqDHVQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/he": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/he/-/he-1.2.0.tgz",
@@ -3264,6 +3576,16 @@
         "node-gyp-build-test": "build-test.js"
       }
     },
+    "node_modules/object-keys": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.1.1.tgz",
+      "integrity": "sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/optionator": {
       "version": "0.9.4",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.4.tgz",
@@ -3551,6 +3873,13 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "node_modules/readonly-date-esm": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/readonly-date-esm/-/readonly-date-esm-2.0.0.tgz",
+      "integrity": "sha512-adlyzz144ofU22kjnnRIN0HPPqIbc5IZvMmMuVtEgMY4mKgNyKqOVb4Fa2GUzE2By4TEPOYoGqDoKRyqmeEuPQ==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
     "node_modules/require-directory": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
@@ -3762,8 +4091,66 @@
       }
     },
     "node_modules/signet.js": {
-      "resolved": "../signet.js",
-      "link": true
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/signet.js/-/signet.js-0.4.0.tgz",
+      "integrity": "sha512-lq1ea6tIme5nhj2z2uAUHDQ3NdpO+u66/JSffgEhYUcwIQGRyYWpaHTef5KZTS7lAStCZn8ck6qVu3vnl+ZNIA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@coral-xyz/anchor": "^0.32.1",
+        "@cosmjs/amino": "^0.38.0",
+        "@cosmjs/crypto": "^0.38.0",
+        "@cosmjs/encoding": "^0.38.0",
+        "@cosmjs/proto-signing": "^0.38.0",
+        "@cosmjs/stargate": "^0.38.0",
+        "@noble/curves": "^2.0.1",
+        "@scure/base": "^2.0.0",
+        "@solana/web3.js": "^1.98.4",
+        "bitcoinjs-lib": "^7.0.0",
+        "chain-registry": "^2.0.0",
+        "coinselect": "^3.1.13",
+        "cosmjs-types": "^0.11.0",
+        "viem": "^2.47.4"
+      }
+    },
+    "node_modules/signet.js/node_modules/@noble/curves": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/@noble/curves/-/curves-2.0.1.tgz",
+      "integrity": "sha512-vs1Az2OOTBiP4q0pwjW5aF0xp9n4MxVrmkFBxc6EKZc6ddYx5gaZiAsZoq0uRRXWbi3AT/sBqn05eRPtn1JCPw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@noble/hashes": "2.0.1"
+      },
+      "engines": {
+        "node": ">= 20.19.0"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/signet.js/node_modules/@noble/hashes": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-2.0.1.tgz",
+      "integrity": "sha512-XlOlEbQcE9fmuXxrVTXCTlG2nlRXa9Rj3rr5Ue/+tX+nmkgbX720YHh0VR3hBF9xDvwnb8D2shVGOwNx+ulArw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 20.19.0"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/signet.js/node_modules/@scure/base": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@scure/base/-/base-2.0.0.tgz",
+      "integrity": "sha512-3E1kpuZginKkek01ovG8krQ0Z44E3DHPjc5S2rjJw9lZn3KSQOs8S7wqikF/AH7iRanHypj85uGyxk0XAyC37w==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
     },
     "node_modules/smol-toml": {
       "version": "1.6.0",
@@ -3932,6 +4319,16 @@
         "url": "https://github.com/chalk/supports-color?sponsor=1"
       }
     },
+    "node_modules/symbol-observable": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/symbol-observable/-/symbol-observable-2.0.3.tgz",
+      "integrity": "sha512-sQV7phh2WCYAn81oAkakC5qjq2Ml0g8ozqz03wOGnx9dDlG1de6yrF+0RAzSJD8fPUow3PTSMf2SAbOGxb93BA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10"
+      }
+    },
     "node_modules/text-encoding-utf-8": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/text-encoding-utf-8/-/text-encoding-utf-8-1.0.2.tgz",
@@ -4127,6 +4524,16 @@
         "typescript": ">=4.8.4 <6.0.0"
       }
     },
+    "node_modules/uint8array-tools": {
+      "version": "0.0.9",
+      "resolved": "https://registry.npmjs.org/uint8array-tools/-/uint8array-tools-0.0.9.tgz",
+      "integrity": "sha512-9vqDWmoSXOoi+K14zNaf6LBV51Q8MayF0/IiQs3GlygIKUYtog603e6virExkjjFosfJUBI4LhbQK1iq8IG11A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/unbash": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/unbash/-/unbash-2.2.0.tgz",
@@ -4170,6 +4577,41 @@
       "license": "MIT",
       "peer": true
     },
+    "node_modules/valibot": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/valibot/-/valibot-1.2.0.tgz",
+      "integrity": "sha512-mm1rxUsmOxzrwnX5arGS+U4T25RdvpPjPN4yR0u9pUBov9+zGVtO84tif1eY4r6zWxVxu3KzIyknJy3rxfRZZg==",
+      "dev": true,
+      "license": "MIT",
+      "peerDependencies": {
+        "typescript": ">=5"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/varuint-bitcoin": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/varuint-bitcoin/-/varuint-bitcoin-2.0.0.tgz",
+      "integrity": "sha512-6QZbU/rHO2ZQYpWFDALCDSRsXbAs1VOEmXAxtbtjLtKuMJ/FQ8YbhfxlaiKv5nklci0M6lZtlZyxo9Q+qNnyog==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "uint8array-tools": "^0.0.8"
+      }
+    },
+    "node_modules/varuint-bitcoin/node_modules/uint8array-tools": {
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/uint8array-tools/-/uint8array-tools-0.0.8.tgz",
+      "integrity": "sha512-xS6+s8e0Xbx++5/0L+yyexukU7pz//Yg6IHg3BKhXotg1JcYtgxVcUctQ0HxLByiJzpAkNFawz1Nz5Xadzo82g==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/viem": {
       "version": "2.47.4",
       "resolved": "https://registry.npmjs.org/viem/-/viem-2.47.4.tgz",
@@ -4417,6 +4859,17 @@
         }
       }
     },
+    "node_modules/xstream": {
+      "version": "11.14.0",
+      "resolved": "https://registry.npmjs.org/xstream/-/xstream-11.14.0.tgz",
+      "integrity": "sha512-1bLb+kKKtKPbgTK6i/BaoAn03g47PpFstlbe1BA+y3pNS/LfvcaghS5BFf9+EE1J+KwSQsEpfJvFN5GqFtiNmw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "globalthis": "^1.0.1",
+        "symbol-observable": "^2.0.3"
+      }
+    },
     "node_modules/y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
diff --git a/package.json b/package.json
index aa65c5d..502ba5d 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "knip": "^5.86.0",
     "mocha": "^11.7.5",
     "prettier": "^3.8.1",
-    "signet.js": "^0.3.1",
+    "signet.js": "^0.4.0",
     "ts-mocha": "^11.1.0",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.57.0",
diff --git a/tests/helpers/mpc-signer.ts b/tests/helpers/mpc-signer.ts
index a4c9cec..dbb4025 100644
--- a/tests/helpers/mpc-signer.ts
+++ b/tests/helpers/mpc-signer.ts
@@ -14,6 +14,7 @@ export interface MpcSigner {
   contract: MpcContract;
   evm: InstanceType<typeof EVM>;
   predecessor: string;
+  publicClient: ReturnType<typeof createPublicClient>;
 }
 
 export function createMpcSigner(sepoliaPrivateKey: string, sepoliaRpcUrl: string): MpcSigner {
@@ -34,7 +35,7 @@ export function createMpcSigner(sepoliaPrivateKey: string, sepoliaRpcUrl: string
   });
   const evm = new EVM({ publicClient: publicClient as any, contract });
 
-  return { contract, evm, predecessor: account.address };
+  return { contract, evm, predecessor: account.address, publicClient };
 }
 
 export async function deriveMpcEthAddress(
@@ -57,17 +58,32 @@ export async function signMessageMpc(
   remainingAccountKeys: PublicKey[],
   indexedInstructions: IndexedInnerInstruction[],
   path: string
-): Promise<{ signature: Buffer; recoveryId: number }> {
+): Promise<{ signature: Buffer; recoveryId: number; sepoliaTxHash: string }> {
   const innerHash = computeInnerHash(programId, nonce, remainingAccountKeys, indexedInstructions);
   const { hashToSign } = await signer.evm.prepareMessageForSigning({ raw: innerHash });
 
-  const rsv = await signer.contract.sign(
-    { payload: hashToSign, path, key_version: 1 },
-    { sign: {}, retry: { delay: 5_000, retryCount: 12 } }
-  );
+  const signArgs = { payload: hashToSign, path, key_version: 1 };
+  const { txHash, requestId } = await signer.contract.createSignatureRequest(signArgs);
+  const receipt = await signer.publicClient.waitForTransactionReceipt({ hash: txHash });
+
+  const pollResult = await signer.contract.pollForRequestId({
+    requestId,
+    payload: signArgs.payload,
+    path: signArgs.path,
+    keyVersion: signArgs.key_version,
+    fromBlock: receipt.blockNumber,
+    options: { delay: 5_000, retryCount: 12 },
+  });
+
+  if (!pollResult || "error" in pollResult) {
+    throw new Error(
+      `MPC signature failed: ${pollResult ? JSON.stringify(pollResult) : "not found"}`
+    );
+  }
 
   return {
-    signature: Buffer.concat([Buffer.from(rsv.r, "hex"), Buffer.from(rsv.s, "hex")]),
-    recoveryId: rsv.v - 27,
+    signature: Buffer.concat([Buffer.from(pollResult.r, "hex"), Buffer.from(pollResult.s, "hex")]),
+    recoveryId: pollResult.v - 27,
+    sepoliaTxHash: txHash,
   };
 }
diff --git a/tests/mpc-ecdsa-proxy.ts b/tests/mpc-ecdsa-proxy.ts
index 494c78b..37df83e 100644
--- a/tests/mpc-ecdsa-proxy.ts
+++ b/tests/mpc-ecdsa-proxy.ts
@@ -47,10 +47,11 @@ describe("mpc-ecdsa-proxy", () => {
     const ethAddress = await deriveMpcEthAddress(signer, MPC_PATH, 1);
     const [walletPDA] = deriveWalletPDA(ethAddress, programId);
 
-    await program.methods
+    const initTxHash = await program.methods
       .initializeWallet(Array.from(ethAddress))
       .accounts({ payer: payer.publicKey })
       .rpc();
+    console.log("Solana initializeWallet tx:", initTxHash);
 
     // Mint tokens to PDA
     const mint = await createMint(provider.connection, payer, payer.publicKey, null, 6);
@@ -85,7 +86,7 @@ describe("mpc-ecdsa-proxy", () => {
     const indexed = toIndexedInnerInstructions([innerIx], remainingKeys);
     const nonce = 0n;
 
-    const { signature, recoveryId } = await signMessageMpc(
+    const { signature, recoveryId, sepoliaTxHash } = await signMessageMpc(
       signer,
       programId,
       nonce,
@@ -93,8 +94,9 @@ describe("mpc-ecdsa-proxy", () => {
       indexed,
       MPC_PATH
     );
+    console.log("Sepolia MPC sign tx:", sepoliaTxHash);
 
-    await program.methods
+    const executeTxHash = await program.methods
       .execute(
         Array.from(signature),
         recoveryId,
@@ -104,6 +106,7 @@ describe("mpc-ecdsa-proxy", () => {
       .accounts({ walletState: walletPDA, payer: payer.publicKey })
       .remainingAccounts(remaining)
       .rpc();
+    console.log("Solana execute tx:", executeTxHash);
 
     // Verify tokens moved
     const recipientAccount = await getAccount(provider.connection, recipientAta.address);