{
  "manageEntity": {
    "action": "Save",
    "entityId": "1499549067",
    "entityType": "Track",
    "nonce": "0xc3d2959c5c09ccdd5c9ba2730281c9f46ceeebf36a7d44f7b4bd88fdf871ce4d",
    "signature": "0xe2c2efb0489e03145295b907187363e23d9f7d303234c9e4ef1079cd6db5eec85949546bb0f566ba7be7ab639e407b5e50fc88b59213036e983ede0d5260f8b11b",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}