{
  "manageEntity": {
    "action": "Save",
    "entityId": "497557328",
    "entityType": "Track",
    "nonce": "0x585e27a8e175d64f600222e73dbee6cab567e9683982cd37e88b97705bed0e55",
    "signature": "0x9807d7dc11f99ae94ac146ffc9acfd0067cb5e5265535976e3c0ccaa6286d7d34443e77312f473ac6fa86f4ad6b0d3c70efa92f3342e384265afd2332cade3421c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}