{
  "manageEntity": {
    "action": "Save",
    "entityId": "666067",
    "entityType": "Track",
    "nonce": "0x84467dde8dacfee29c03ae88756ad2f033c6a29b2079438930fba6e36ef73719",
    "signature": "0x7e80a5c101027c0418c8d6b005e8b4fe88028f84b31cae3bdca6e70421c72d3a7794281461ad57c2f142a95bbc111b7ef344616bce2ecbad293fd1a7a3c69a121c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}