{
  "manageEntity": {
    "action": "Save",
    "entityId": "552969743",
    "entityType": "Track",
    "nonce": "0xc7077876510bd14083b3978f90d5f0f0e83c2e2b4ae255b20d3efeb2f17b8ff6",
    "signature": "0xbf25ce6ab5e8c50237700f4a044ef1eb2a9e668ed0d9bae129c88931936bd423391a47ff55fe96eeb166a6e8b58b8947be547600e57de2248b23302ad83e65331b",
    "signer": "0xCedE64dcD8b0FdEDBdADF4b0ba433797eD6301c9",
    "userId": "638733607"
  }
}