{
  "manageEntity": {
    "action": "Save",
    "entityId": "899334",
    "entityType": "Track",
    "nonce": "0x7e3bf2145d80cacc89aee4b8b55164779577f696d14fb74b041ae3ec243b892f",
    "signature": "0xe1c24b9e90429ebd5b336158cad6c4f7560da0a3ffc5c7e1823f2ace246397135892845daaa0d0c995e4a8307c9b42a7860c51d1cc832bc2f233731990bfb1d31c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}