{
  "manageEntity": {
    "action": "Save",
    "entityId": "475850227",
    "entityType": "Track",
    "nonce": "0xa1d6c9d8c7b57614e3fccd88577efbfcef2a3f3ddf30c4baed806af1f29c15fa",
    "signature": "0x3bb18c1342a3fd8af2d44a86628d045c278ae50a9c050cfbf94e0f22710c6eec430ab815b5063eccb6d755b39d3d9e9b630814136fa5333c52f46f695d18b8bc1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}