{
  "manageEntity": {
    "action": "Save",
    "entityId": "1788922721",
    "entityType": "Track",
    "nonce": "0xf24ef1e033689027dca07ce76096c1e88cf99e3d8667e4fe19104338911c84a3",
    "signature": "0xc6aea1ff2632a213a84b9ca56dd589ce657dd9937fdde6e585add6c9304e23b33d53a94f1a83ac91586e1cc05b79d6779d48a395610df96447b8fc518a6ff51e1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}