{
  "manageEntity": {
    "action": "Save",
    "entityId": "187078266",
    "entityType": "Track",
    "nonce": "0x13e20fa8ed4cf7e8ad6f790ef36b95f2bb2b7ffd962aebdc113c5b23749bfc68",
    "signature": "0xde6b3f39cbf0f7c6029bcf0f831ae45170547c30acc0064aa70294f6d02e3d58557f01dca7b3a22ca471b2a4fc3681c6958c97309bd86e65745c8619d6a3164d1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}