{
  "manageEntity": {
    "action": "Save",
    "entityId": "395157981",
    "entityType": "Track",
    "nonce": "0x16bbd6f36e12021102dc5a67beba9848d68f91bad37eb9fc76ad2b0797af21ac",
    "signature": "0x13dd0aed1e9263f1a8c7f3fc55554edd84ca5239594a438876828e0d92b67172308d8b1d25ca2e6e26e60edcf76e96f4f7632d28eb5add6a63fd0055d9803c471c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}