{
  "manageEntity": {
    "action": "Save",
    "entityId": "420979656",
    "entityType": "Track",
    "nonce": "0x0ffc24514c11114b76d23990bbf120d14c2f3a62ecaa688c3f708a5bdc893382",
    "signature": "0xfa57bc3e1d66896f220b867ed3c104480ab9f97ba591d329e0a5b07e062d0bed4230f236503227ded2cdcd84c9df94fc0be9b4fd50d374d4bf08d3afcda208811c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}