{
  "manageEntity": {
    "action": "Save",
    "entityId": "1211557232",
    "entityType": "Track",
    "nonce": "0xa12281291102b31493723677a18cb3eefe324689984cef5aab9b4469448e118e",
    "signature": "0x9c8b8273d699d93dd9e3637845b44d34755fb753d4d9c438dd01625496213ad21d59dcdb2326798c417c23631ea73fcb026a954604cf03e40cc8dd587a23924e1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}