{
  "manageEntity": {
    "action": "Save",
    "entityId": "603919254",
    "entityType": "Track",
    "nonce": "0x4898236e6670cd211e256c201c1e0ab423bbbd1bcb8e5dabaf3f2f6af79c38b8",
    "signature": "0x65c51ff90149818e05d2698fb9d45da83dd2ccf6820d55454c43f19a007d83b02550781db03995eae384b36c3b0ffaf6b121344f94b8f6edcad475478a00f0c51b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}