{
  "manageEntity": {
    "action": "Save",
    "entityId": "552848",
    "entityType": "Track",
    "nonce": "0x5e3bc350c40900b142841483d35c68b20d794e1e8dcd12ee791da05aa31f5702",
    "signature": "0x2a40080fe8cd41e40ef33c18001f9841731e47108fbdd312802c2a172557551b4ac150fdc8b5c8d02484f96be3f20ad2fafe86276e1767ba84bfda310b3c8b231c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}