{
  "manageEntity": {
    "action": "Save",
    "entityId": "488483732",
    "entityType": "Track",
    "nonce": "0x9da11111fe0165d9c857c7dcfb1ecdaa9e291521e194f4001da78ecd0307db92",
    "signature": "0x870fb791a1cc9d9a8cc844dbeba5e21f007cbbdf3e582e6e463a3589b176ef8b00bb655e5f366f88ffd49527a5e5b636f76ca91e4a0806b0f642b56f2f4f4f351b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}