{
  "manageEntity": {
    "action": "Save",
    "entityId": "252566",
    "entityType": "Track",
    "nonce": "0x2ee1fc1d2fa2db3853f0ba55e09ee648db45f84d834ce6a451ed2042b38f7049",
    "signature": "0xd1fb95ad3c088f603abe8cde86fe9158ef58f5f164b08caff72a0e94a8b1ba00011660c70b1b57cc75d7dc03a2f8936b06f36c269c2d3949d88abf91872329f51b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}