{
  "manageEntity": {
    "action": "Save",
    "entityId": "150839931",
    "entityType": "Track",
    "nonce": "0xc645003f073f64333872580d59be1d12f85abaf32d3ed988b7ad04de2e897ec2",
    "signature": "0x4d5ab1f518a311bec7cc4e24ee7d59009383ff2c0ca0abb75dedd026bb1c95632e8746bb78341a9b3bac27b239cae7ee634d4e05ee88cf4455c1300118a4a73d1b",
    "signer": "0x4E3828bc809fb5B9deb81fa536cF73Dd5bF4eeB2",
    "userId": "185184169"
  }
}