{
  "manageEntity": {
    "action": "Save",
    "entityId": "303096",
    "entityType": "Track",
    "nonce": "0x97c802798c5bdf1a186ae1e5263793f54e9e278e9ba8b723ec4864b4a83bd7e9",
    "signature": "0xde31cd9bdea01319f14e6181553455b865e8c43226fce74a5191e8b38e0da20831c0019c80316ba89ea4a93c8289357b28ba8b540bf3453d3f1fa3a0c683f7081b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}