{
  "manageEntity": {
    "action": "Save",
    "entityId": "902189369",
    "entityType": "Track",
    "nonce": "0xf81e3bb20d8306590e5596d0278f2a5709b416befac9ce797153548756f9dd3d",
    "signature": "0xdfbe329acd3f61c531cdd65fcdde89babe9f5660c884f796fd2aa0118a07f91618c9f895c4de87319f245456fed663e7b5917c865771ac330901c99c299d16061b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}