{
  "manageEntity": {
    "action": "Save",
    "entityId": "393876520",
    "entityType": "Track",
    "nonce": "0x20974d0d7c484185c4ee7f1c41aa77c0b220dbf96bb1aa399aa35cccc1aed0da",
    "signature": "0xa5889146ee43f0e3a599471fc9015ad0fcb827ab052f100edc4163e5271f8e3823c4e39334986b4e27e4f3402ae35e27000b12634f55d27f34804f607ad1c95f1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}