{
  "manageEntity": {
    "action": "Save",
    "entityId": "1969364818",
    "entityType": "Track",
    "nonce": "0x8bc5d3693fe9b32fadb0db621f2bc7a004cfaa09efd9655bb710770e2a471c60",
    "signature": "0x8693d329d954962a1be5454eee30324b41291c26171d749aa8e8b088736d47fd1c9025260163f258f9651afea4b6f739ae07fd4e43f6b64956d5bc40a28044411b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}