{
  "manageEntity": {
    "action": "Save",
    "entityId": "50386377",
    "entityType": "Track",
    "nonce": "0x3d9a868ad2673595a0c661f38f0f0125f8d6065096a0d0a4eb149aebb0899cd2",
    "signature": "0x40e78a3365e0f81bf5d4f9a62eb9cf996327a332fc2d63cb051246b7a68102940fb67a0c8971f6e15d846be6ff652bb72ce2ddbf20562a7b6682a6c2740aca991b",
    "signer": "0xC9e4fe89311517E71e968f6DE26A6c075A639F41",
    "userId": "964899801"
  }
}