{
  "manageEntity": {
    "action": "Save",
    "entityId": "2103578561",
    "entityType": "Track",
    "nonce": "0xa1f12fa9fdd1b4cda5c4163d6745cddbe13f5f4ee4ac53f54fb2d5d424cf03dd",
    "signature": "0xddbc05a2698edff202ba4117f97b92e57ae5a4c073b76998c68b878c280129c0122c827f0d2ba4c709bace64ceb179aa675659975257e3b9218911ea95ec69b81c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}