{
  "manageEntity": {
    "action": "Save",
    "entityId": "653071",
    "entityType": "Track",
    "nonce": "0x58b325cb8cf689b2a656a207b3c5bef4473a2849947b1269d70ddde11a5c733e",
    "signature": "0xa497c435cd2dd4530d323bbee82dcb19ae1631443c4570aef183d1cbfe2104443b9df136b55589fecd94711ba4d7e53c9e9e03e375c6fea36e020867e54f84741b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}