{
  "manageEntity": {
    "action": "Save",
    "entityId": "1399659867",
    "entityType": "Track",
    "nonce": "0x480214bac6cecde7332121b97fb4e80c3ed1f0d490518b71e006c77fcc629373",
    "signature": "0x1576ac57660fdec1b8f9651b7261a39bba231539ec2054dcd0343eed1dbad739492a6c73c0d87f20be582270ba0aeccd6b1221140ceee97874c3a6c9af719bd61b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}