{
  "manageEntity": {
    "action": "Save",
    "entityId": "1199643279",
    "entityType": "Track",
    "nonce": "0xcbe816385a015cd710f772ea1761c589f8e13a13d72f5f6c9010f7a424fb53aa",
    "signature": "0xcb089e489ef840ef3cbb1914d83a77cef2ee752afaa4e58df0b139bd9de477716f274c138a4e54e6231bee1a7aee0c71563fdb14b244378a9e77b1d3349a56571c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}