{
  "manageEntity": {
    "action": "Save",
    "entityId": "537972293",
    "entityType": "Track",
    "nonce": "0xb415204257fe9560f23e3537d250f5bfdc414b22ad4e2725494d83565a8563b8",
    "signature": "0xd14fc2c658613315c67880614b73efcbd7ee8b67ca7b07be0f563b12da520c40135c598634a19d04860973094a31026597405a8731b96fd7d890bf7a80861c331c",
    "signer": "0xC7B16Eee24C03712c67aa884907593f4df23db87",
    "userId": "56534466"
  }
}