{
  "manageEntity": {
    "action": "Save",
    "entityId": "1372288794",
    "entityType": "Track",
    "nonce": "0xad73c73dd8f61c682c4daea6c602297121e32c7816d0d78550d9a57e9369b251",
    "signature": "0x122cc6fa909c8701b4524e814dbc82eeb12b28b7fa3922ea9ae8e4b620db4e0851e4b2c3dfe468ad9b1d25e6ae19633d68fa0815c641e69734ae4cb081b90fae1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}