{
  "manageEntity": {
    "action": "Save",
    "entityId": "221459096",
    "entityType": "Track",
    "nonce": "0x5b7be88e298ae8afdf4fca2d21f97fe3e3a2863cc3b66a936d6733af41a9a9a2",
    "signature": "0x77430621dccec4ce7ca97a543f638a47f8d963c9e799dcb70f7513e4074ae5075602714ba9587b13ab7870f760a33ffa3376585a6fceffe141de9b158ab2dd941c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}