{
  "manageEntity": {
    "action": "Save",
    "entityId": "1445676310",
    "entityType": "Track",
    "nonce": "0x100ec8d633f9ef10ca3a9a27159eb6b28a0400b7b444c00ed32e9d49d4fd47af",
    "signature": "0xaa4fcdf5fbb3a7caa0d5035b8bfe4c1f8b34ca59da04a53122a374c21e496afe4b60b6cd9787cccdd1c70e7e4ff175efd2a75e876bf5f840a2fd233b3398da781c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}