{
  "manageEntity": {
    "action": "Save",
    "entityId": "1390696618",
    "entityType": "Track",
    "nonce": "0x34c1b5b49103c783340517d08385f709858da9f3d4324e9690c03db563267ec0",
    "signature": "0xce2fb12fb48da7b3e7b8a9b313e5bbfdadc8c2f9c385db22d00715aaf11b8a9430b9de37799593de6b522d69f9aea7ceaed0659fb8b733ff9754cce52fe2da891c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}