{
  "manageEntity": {
    "action": "Save",
    "entityId": "464166891",
    "entityType": "Track",
    "nonce": "0x8db14eb6afa41be811d7a7b2508b57a2cb373a2298b6e01c0d6e25336070714d",
    "signature": "0xb087436ddfa95ebe0bdf7c2c489607164b0027186154f601539fab3d2e00d3336b40a8254aa6592add5832363bf7473413cedf0a08347e39b41a3dffc11bcd491c",
    "signer": "0x879AB09f06df488AF471eeBA6489678312560024",
    "userId": "903958768"
  }
}