{
  "manageEntity": {
    "action": "Save",
    "entityId": "1485903945",
    "entityType": "Track",
    "nonce": "1789784573767642601",
    "signature": "0x5b3aa132b3ffb79ad0449efee020b7813fb079c03092b97a68a4e1e9718e9e606f8ecb5c2e1dc02a85565571c9639391bb9403cb7d845354fde5ebecd5a5a2711c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}