{
  "manageEntity": {
    "action": "Save",
    "entityId": "951064",
    "entityType": "Track",
    "nonce": "0xb0164f63969e2ac4c5bef189e0acde505cca6916b8de86a041c1792591932f39",
    "signature": "0xf04cab90a2d2fd06a7cf10c8624785318bab29694982602b9e2b7eea82439ae20731941b2e263db5e1eb7093b93061701b81b69e74f873384144777f508a018c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}