{
  "manageEntity": {
    "action": "Save",
    "entityId": "268710473",
    "entityType": "Track",
    "nonce": "0xc23b84eb7834299ebed8d51ddb440de973f3658cc134e28fc00542bda6ee5a7a",
    "signature": "0xa2b944b1487aee7970f913e13fb39a394cfe6eb9c768d9cca575af152eb855ab13064010ffba3da062f5970502ba600a65706a9f0aca1e977b75bf7002bf0d8c1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}