{
  "manageEntity": {
    "action": "Save",
    "entityId": "1077499370",
    "entityType": "Track",
    "nonce": "0x6bfbf3b995ec6cc483559f00a5b0b2771650500af40abff2ddf9448475761472",
    "signature": "0x486702b65e912e195aac00ddd88d424ccdd7c44f88b881e608c56be5454828473a3ca27a82e4072d1f5c06ba71e29ffcdb34dc06a5451c9e037aed0804f618f51c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}