{
  "manageEntity": {
    "action": "Save",
    "entityId": "667628419",
    "entityType": "Track",
    "nonce": "0xf40d0e3124dad3dc6be219344b20d3eca111983ad8d1f4eefe67bd59f3afbf49",
    "signature": "0x5b6715679ceba90de3c77cddf49a98c692b09251919e740846b2ab7762df351667275bb15a221207c5cf05fea31ad39fc0ec8332e5d2dd164dedce55b1dc1c091c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}