{
  "manageEntity": {
    "action": "Save",
    "entityId": "900903",
    "entityType": "Track",
    "nonce": "0x07e09acc16a0d5731ef1b0dffa5a0d2d033908949addfe78e8ddd25b6015e121",
    "signature": "0xecc5f671cc3d651d13812b26cd6fbe76dfe781e208724ec33aa2458666ac0fed4fddb919468c229004ee6cdb07167e03f36aeefbe71c59374990b9ceb51289e31c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}