{
  "manageEntity": {
    "action": "Save",
    "entityId": "587063905",
    "entityType": "Track",
    "nonce": "1786785294829330732",
    "signature": "0x36420334c6bacaa08dfe78d9f50aa5c9ccc90e873045d0e8d51b3cb72bb59f8a69f8145b3a0aa4292b0bc3d90145dd4b2340617e297d4ea7cc4f2515e41d73c41c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}