{
  "manageEntity": {
    "action": "Save",
    "entityId": "543789598",
    "entityType": "Track",
    "nonce": "0x4b75cfe7fb6627023e35eb69a317123275fb3a269d231eaea0468d1a728318ed",
    "signature": "0x7861a8cf9cebfaa696dc11f5b80474ed35983e7fecea821dec51c9e65ea69fd11e06412fdeb693a3a7fd90a422ccd22626220d68c1ed09481cbe6e9866b2d4dc1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}