{
  "manageEntity": {
    "action": "Save",
    "entityId": "290264184",
    "entityType": "Track",
    "nonce": "0xa15a7bb4f2047b1cf969779e186bec6d48e27291c7755fa4b0780b1b41b728dc",
    "signature": "0x0b6113170c62d7b274c15813553a3780a5035c55f1ed649778234ffc3be5b9c540e58c82b5d5a7db880f975896da9a2b755ee16012adeaebf0a6d6cc9ed906d01c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}