{
  "manageEntity": {
    "action": "Save",
    "entityId": "421514506",
    "entityType": "Track",
    "nonce": "0x8f880be489a97a1d394bb26f9a87a06a413aa25d0dc6843a909ce87f523be71b",
    "signature": "0x0889b6be25fe904c714cba9a34b98b881de61bcfd9f9950a0e34e9fdac7a19e35818ed3094ed5cdb7beb2c92346588517f62c19a226d358c4778a5ffe73171f51c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}