{
  "manageEntity": {
    "action": "Save",
    "entityId": "278821879",
    "entityType": "Track",
    "nonce": "0x5dbca75d677479dc52dd2849ca043a2c04edf69bde3d9ad29f15a81ba58efe18",
    "signature": "0xc0e4f55b78e3864197d2e56d2540ea690caa6aae11ae8aaad605f93531b8dba30f603b626320d56dc03e12864275e689bd45c6e4a28fde7f19c056d4e76a2c6d1b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}