{
  "manageEntity": {
    "action": "Save",
    "entityId": "1766646835",
    "entityType": "Track",
    "nonce": "0xd97b42314b787e1c1cb5eea8462ee27351cd9c478f732cd6e92f61ed3d33d8b3",
    "signature": "0xe67d10b25a2bfea10b9eecb6ae4fadb8bdf02ce11270de1b508618d22b18d61558249624a82d0b72c16a24e2d3dda3e2a892c2f8fa978741b4032bd849b6bb781c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}