{
  "manageEntity": {
    "action": "Save",
    "entityId": "458283808",
    "entityType": "Track",
    "nonce": "0x35fd64911d994eccbb6404bfd2450e40833409c660156f2859c9afb332c81697",
    "signature": "0x9518280bbbd5e52a746ae1a78b050a6349471d1384a098f2fa1bd80b612aff73125287bea68c974a9a113d00d50140dd374a1fe5ee1117886dfddc7ef6a7b3ad1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}