{
  "manageEntity": {
    "action": "Save",
    "entityId": "774467187",
    "entityType": "Track",
    "nonce": "0xbaf33dd105be515e393814fa5d2ba0ef130e94924c592358a9f2656a84265445",
    "signature": "0xc799ab8da2e02055f8cec3db73a80e39a8fb0f6f978ec972d9053017077332e91acd43077b53eb773df962938222b1e2582425b5e33aeca187a577fe505cd7e21b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}