{
  "manageEntity": {
    "action": "Save",
    "entityId": "140420445",
    "entityType": "Track",
    "nonce": "0x9bc0dd4d4562fe648f345141699fa9f0a5b50c77366155e1e4f1a1f33306b848",
    "signature": "0x43e9fb8003a83108800f7e8b233ed337f9bcfeb38e8aaa9a510339473301ecd71e5e283bd7e4b35ff9ae2136206556a8f7a2c63dbf8cee3e285a141b7138336a1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}