{
  "manageEntity": {
    "action": "Save",
    "entityId": "399022908",
    "entityType": "Track",
    "nonce": "0xb1cb66cf9235bd32561c8dd9344b119988080fb84c9aea58a0ebf879b48b0919",
    "signature": "0xbfee383a371ec2ccc175702645f00077530f735dbda2c709ea5194923838c8e425e6fc131a2cf18957453195d0ee4fe59b474157227924a52b756bfc2b396ab81b",
    "signer": "0xAA981726F7939BF5eaAbfa9a58D0C454f5cB535D",
    "userId": "398277387"
  }
}