{
  "manageEntity": {
    "action": "Save",
    "entityId": "1270200132",
    "entityType": "Track",
    "nonce": "0x7cdffbbcdcd5ff4e508267ce9e03f380c3703debb9cb69c149c04f26458dd4d8",
    "signature": "0xb3dc4b80d058c84de4df6b4b7b572bbb67002e64a85c4a44cca36f0af37fe77d27fef83b3f62a70fe64bd57bf401be6eb808301fc2107ee56ef8e22f739144221b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}