{
  "manageEntity": {
    "action": "Save",
    "entityId": "703288305",
    "entityType": "Track",
    "nonce": "0xdc7f85ec84a700a30e0e199e858a610a088d5f1271b0c585fc4b3c306200dd73",
    "signature": "0x9d8cf5953bf2015d441c73d6fcdb9518736674af4529db607a1c8a23223147697a402766bc9b73a388b5cd5576f9a4c217f8def271a0e981cda485c5ce977c7c1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}