{
  "manageEntity": {
    "action": "Save",
    "entityId": "750301569",
    "entityType": "Track",
    "nonce": "0x4902cba08d04a4849361d76514ea7c210d190c84104eefc634715371dc758a68",
    "signature": "0x57a5d2ef106854c01f3cde4387ddef50a5a388a01436c9c151f1565456cb08ba18e4988fff66b6517353462bfcdbe4a5f8f3979957fe8e3181377ad974ed5de21c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}