{
  "manageEntity": {
    "action": "Save",
    "entityId": "577817855",
    "entityType": "Track",
    "nonce": "1786995600991345403",
    "signature": "0x8557a64dddcc36fbd01d2ccc8a599146f9772e199b0a85f39c81046b0cdd60a41eb5dc31c54c5956be0ed0ffa7bcb9561b42d6efc0944a442f30d72045d0662a1b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}