{
  "manageEntity": {
    "action": "Save",
    "entityId": "431464940",
    "entityType": "Track",
    "nonce": "0x537ea8bbfb5fb7657a246f654f133e784dde4f181bfeb89cca7c8a64e16a4a94",
    "signature": "0xd0606b27d84d0dd7b239af4774fa5e00cf138ff58bee65f2e990bc371e4537ca4d8dc7791de6533031e4d02022eba058b1ad0d8ddbe81b59442b4533f5d1a0881b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}