{
  "manageEntity": {
    "action": "Save",
    "entityId": "1144545372",
    "entityType": "Track",
    "nonce": "0x4a245a67e0d31499db98ee1ab7efb052fd59ef89ca5a34ce7c72b2eed470bf1a",
    "signature": "0xa35b4324bd744ec52d9c7c8bfc11d483bfd1ba44beea33e914156b87c666806913968e41f9fd82a9be89e8e1241de69493d1d6111f90878998fb974c71af5d6d1b",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}