{
  "manageEntity": {
    "action": "Save",
    "entityId": "239481",
    "entityType": "Track",
    "nonce": "0x73bf37e9558b96c7da189863db086aa92f13d2e5c0d7ffc3a4668b69f4e08cf5",
    "signature": "0x5497b73456495092e8b1623adc634f9240a8a30e2687b030d780bf02ca42f00b64109ff11de0af71aa050d3e397a45d247092cf46e77f512a3676864dd30d0941c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}