{
  "manageEntity": {
    "action": "Save",
    "entityId": "943638249",
    "entityType": "Track",
    "nonce": "0x10f330c7514231fd01521df791347ee6212dbd1905c55c96d20024c8014f44d0",
    "signature": "0x58dce1e86f5a6faba58c9fc081f1b6c14073b00455d671af86e4ca7c458e9f6c1d9c0c57742ed016add4a964f69b3c9a676eea82283436e0af9664e9ec3b00391c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}