{
  "manageEntity": {
    "action": "Save",
    "entityId": "595643812",
    "entityType": "Track",
    "nonce": "0x21ae2b09165043087e1820bb610e059469147a3207bdb2c651c2b86f5682fcaa",
    "signature": "0x9f92b44f0a706acbc3c0890a666fbe9dfc7ae9093b341dcfc963b4ec6af753ec1b7f7b782453b9ffeb9344a9e2e1292033084dce292f4ba3825df67eb82199691b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}