{
  "manageEntity": {
    "action": "Save",
    "entityId": "375880",
    "entityType": "Track",
    "nonce": "0x9f5ec8dddd10c1e3a308a77ad47b99b85c3acd7806c183b5d734af9d48459919",
    "signature": "0xdf824efe8e0bec0926dfa1c7fe043e3f0109f8df37a3417147e9078c099176c819adf9e4417bcd4d6b46b92fff98a604722b9cef987a5715b9504c60f3d9666a1c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}