{
  "manageEntity": {
    "action": "Save",
    "entityId": "666959975",
    "entityType": "Track",
    "nonce": "0xd3f39f5ad723d22f1157ce51379ff523cd12bf402294b8ca846f4b70b6e09039",
    "signature": "0x5b68f5437dcd408ad8a18519c4ef97307440a3dc3fa3309283b569727a5b9f1f343fa7327710f815221bd0b9e636fe95755b37c27f944a47c0da270ae408fcae1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}