{
  "manageEntity": {
    "action": "Save",
    "entityId": "1664535572",
    "entityType": "Track",
    "nonce": "1789915385288896517",
    "signature": "0x59556199b600b37c2b6de0cb406fa46ae70e35eab963a8d4a4d4d8cb9dcbbdc55921ec82446b48c299f344761233ebe2a1afeb6470c98e923e038b9100f556361c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}