{
  "manageEntity": {
    "action": "Save",
    "entityId": "518121690",
    "entityType": "Track",
    "nonce": "0xf47c55ca1ab463e804d402d54b01128e00010e1bdb8e467d0a20ad05faf88535",
    "signature": "0xae2d326bd85dee87877c77ef08c6e7d4c7cfce866158cc285645c0486b82e693597393dcb7a96a50401697657799285025aba34a0a2c0bb48ab40b514d79d7851b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}