{
  "manageEntity": {
    "action": "Save",
    "entityId": "387986",
    "entityType": "Track",
    "nonce": "0x4acd2d6984f900e0dda91392c458c40f4f49a4a94df1875937315985fcb11531",
    "signature": "0x3de1f33cbf95e8c7a5daea3d9be4be688192e10168b8f554966ab63ec797b7af63ec5eb626b842d1aa7861ee846fd477536fbfbdac7de58e73f9611bfdc9c8441b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}