{
  "manageEntity": {
    "action": "Save",
    "entityId": "444740233",
    "entityType": "Track",
    "nonce": "0x41903d27152bfde5a6ac5ee02013ba2fc1a6e990186591c71fc43e00111f7a6a",
    "signature": "0x474d91a2b937f094978e0a59ead2a313a8196a898cf3a02c64242bc0ffc11f1d70dc5ffd60cd1a242e2ada2f815bdd4a5ae96800d9bd96ab0478020434fa05d41b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}