{
  "manageEntity": {
    "action": "Save",
    "entityId": "708910889",
    "entityType": "Track",
    "nonce": "0x49574c9d531c43f760b190e808c32869be28d4ddae15c7dd63eb54ec00140e2a",
    "signature": "0xfd0a04e860240f7e1578525c5ab1caf9685e975041c59fd7a83df8025ad010fc6e4a1f770706fc2d5aa92b130d15287fd04370be91bd82d6b9db4ec0b44183ca1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}