{
  "manageEntity": {
    "action": "Save",
    "entityId": "739791884",
    "entityType": "Track",
    "nonce": "0x799c97bc01025ca707226be125bffb01b25d503de372db284fd44b871b309b31",
    "signature": "0x51aa0b5cae6c665c95bc4546f53a6620e667412c8bc7f4f9b77a00597d62286f775f3b51b4d9c9eb84e99398e3b77904addb13832f5d0d6f7acda62126be7e111c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}