{
  "manageEntity": {
    "action": "Save",
    "entityId": "399706341",
    "entityType": "Track",
    "nonce": "0x6c744dc5eb002effb9e36a2f8a71ce6f51cdf2683f10218ed07e9b136daeebb0",
    "signature": "0x7131bd6c35cbd4b066c7b4f170cd95e2fb11b62ca4d2c7d94af4bb5c41984eea7dcb95ae1b2ba808de7577a30e0636418d8b2059ca1edd3824132f1e5121a85a1b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}