{
  "manageEntity": {
    "action": "Save",
    "entityId": "1375273447",
    "entityType": "Track",
    "nonce": "0x316f525dc33ef34a287d16c72da4df681b4eda2b851da4bf04e0a9247c7aae56",
    "signature": "0xba268fe97ae90eb425db602b8ee5a6975d8d13a68cfac887f49e8515349d7cf4546df428c1cfee6eb47b0d2cfa4daaa5411792ac852062179966f3300c80cb801c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}