{
  "manageEntity": {
    "action": "Save",
    "entityId": "1747149816",
    "entityType": "Track",
    "nonce": "0x0cc4f6d00d27f9981ab702911f421818cb3a97b66ca994350cd71bf03181f39c",
    "signature": "0x4e82441e842a413ced07e7619bcbe2e870d69c175eecc5737afecda149e7bfb02e13e775410ef34baac2959fbaf4370c2095be81d07c60224902260eef79fc661c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}