{
  "manageEntity": {
    "action": "Save",
    "entityId": "8667",
    "entityType": "Track",
    "nonce": "0x11d9a2bba2785a8a651d94265c137be0bb4f44552f28aa77c895727d8569fb6d",
    "signature": "0xc5924beae69d5c412a8b1e7a0be363990c899ef57b4406fa7eed8965ff848e2867b77ce540721e1a9ba1b2e3d218d826b384e78ab46ba830afd83a548588bd4b1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}