{
  "manageEntity": {
    "action": "Save",
    "entityId": "260135385",
    "entityType": "Track",
    "nonce": "0x6a429a992d1966b3f1084efda9e2982999ff0ae5f06694e39a7212b2ff811c5a",
    "signature": "0xefbbc4f54a41fb37cdcb420859cb29a6d5d3d282015cde7f27d32f362b68daa7192c29aa7641462fe5a58e7730f1dd5cdb6f85fc69efc74c317201ac1b1ce3401c",
    "signer": "0x4E3828bc809fb5B9deb81fa536cF73Dd5bF4eeB2",
    "userId": "185184169"
  }
}