{
  "manageEntity": {
    "action": "Save",
    "entityId": "489507938",
    "entityType": "Track",
    "nonce": "0x00c63dc6e7e99dbe1abc0d7cc0bb21ae38c5d708971d316594f1def015e5be3f",
    "signature": "0xe49d7ac0eaea3c954aa33d8e6d768cc33dd8e87d187000848ffe003cfb4218951cfbfc8c6628fc2c1bcda9c4056c7537c911ddbbd747a523376aef6cbe5977521c",
    "signer": "0xb1B522e4c290853bC2ABb1D802d311A7EB1e696B",
    "userId": "94334210"
  }
}