{
  "manageEntity": {
    "action": "Save",
    "entityId": "250179",
    "entityType": "Track",
    "nonce": "0xecae4a87934aead234ffa1a7af6bb79b5d4c6076366ed43d0701fa5e8b0565f9",
    "signature": "0x4bd27fe9a29155cad42d35f03325baf3cf72f439f2acbae3549448cc6af444f40188ea0f3780ec9ee9cc7effe1ab5c937ee66d421bc1c26b29bb6702bb3e155d1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}