{
  "manageEntity": {
    "action": "Save",
    "entityId": "815742103",
    "entityType": "Track",
    "nonce": "0xc7725695f675e1a96dddd891212b7e27ec54629a32a6bf168e26fdb8cd9a14dd",
    "signature": "0x975a45781eceaa639455a96224fa5b9399edad8a097857e9d17653bcb4c673ff4273cb9dadc3da1b2e6f8097b170e061f6202670b46a14ce4654b0214a5f3ea11b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}