{
  "manageEntity": {
    "action": "Save",
    "entityId": "874960156",
    "entityType": "Track",
    "nonce": "0xda62dff7b2a299cad77f480b53a3dbcf2543996250a966accf22812841714d8a",
    "signature": "0x82c0e87b11876f4e7551d711d7e098f1cc4cb54ad4aae658ecef5e930643cebb2b45827e8040cbaf02aedae10353df9e7d3b3a74793426c66c2c950f272916d71b",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}