{
  "manageEntity": {
    "action": "Save",
    "entityId": "372144007",
    "entityType": "Track",
    "nonce": "1787440058307355747",
    "signature": "0xd03ec40ae4efc891a3ae526ee5e8cdb9a743f950d51d8f7c67da87725881798211fbe6e7c8c2fd4f446b32f0f89d8b024e3c92548a6af79de9b9b6d7b4bce7171c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}