{
  "manageEntity": {
    "action": "Save",
    "entityId": "754125822",
    "entityType": "Track",
    "nonce": "0x4b46fc3fa23da14eff5731d707f96c28325354150c0335a08300a3f3ed3bb791",
    "signature": "0x13e2fe3c42642147546687deed2e8f5af1e0b7719f6a555dbbaac58c7a3b5d3f4626c1aa2d890f0bded359daf97b0525aab3ce60b0792f4ee669e29071aa8eca1b",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}