{
  "manageEntity": {
    "action": "Save",
    "entityId": "291719475",
    "entityType": "Track",
    "nonce": "1792404680968252809",
    "signature": "0x83399342c341cd329f6c640b750084e3555cf9bd14f1e17b5239c62168ae1ce92c938ecb1c898491366321d4c314729909367d1de31687d928c1c0f59bfcf7111b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}