{
  "manageEntity": {
    "action": "Save",
    "entityId": "815496492",
    "entityType": "Track",
    "nonce": "0xa64c8631b855c07eb958d1b34b0a73e05366d71b6d434642159555b6e76f9937",
    "signature": "0x9ad4c05a2022d9bcb7b3263d056f176cb768321c7fa964b7eda6cd4529092fa056bb20e5797f1e1223fb15ccaf20aedff459093bc781f163a89341e966fb90141c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}