{
  "manageEntity": {
    "action": "Save",
    "entityId": "533898",
    "entityType": "Track",
    "nonce": "0x4e5ee8f76251d3f6bf5415ee885a76ed674f9c9e11e0891dfac0b5d6f2698a49",
    "signature": "0x6ab623b8aac3761a94939e5db8a75c0bb6fd7912c12ec4112cc17bb100f994fa5f311241888ac5569c8b047983deb161b56021778ae4eca45d6d50edf7c788841c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}