{
  "manageEntity": {
    "action": "Save",
    "entityId": "603976899",
    "entityType": "Track",
    "nonce": "0x3a1abfb8cd4ee6885687a938e331a3cc0fc9131290a5dd21017ff3d164350e62",
    "signature": "0xa56a1311555f833b9d4152555dc4bb61b4de4feeba85edd8d4325cb6e4d047b646c38c627acc0111dabea0b85efb1eb5dc0da8bceae043d96e1694eb50f502821b",
    "signer": "0x53d8e61f7BdCd69E26B5AAe8F197464091224DB4",
    "userId": "99786"
  }
}