{
  "manageEntity": {
    "action": "Save",
    "entityId": "737820543",
    "entityType": "Track",
    "nonce": "0x28f8e3e2d6730002cdb4d4b94d48512827f18c1d37f0b038ed2a1836fcc25cf2",
    "signature": "0xd2adc1010c53a472373f4cd5cb284af8e310387269447dfb685c56f0b8c5ff89071d07e68fe9393e0b955ec3872351e21036cd0fef185d8a321bd0f75633b2341b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}