{
  "manageEntity": {
    "action": "Save",
    "entityId": "677682261",
    "entityType": "Track",
    "nonce": "0xd88ee43520eeb23a805c99ca95f4fdc8dc7ff7c368b155afe38b75f6b08164eb",
    "signature": "0x3cd0e103a2f32869740a06a23e4468cfef40f9e386b6cc3d11b8d762c8b517331598d181a3a8964de0577d836925be08e38f1fac25bad0c34535fde1fe11d7b31c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}