{
  "manageEntity": {
    "action": "Save",
    "entityId": "1815533457",
    "entityType": "Track",
    "nonce": "0xc31269709df1e329c5195161094835db97c22f1197e5106d9187971cf63fe9bf",
    "signature": "0x64409e25450e03cb568e7931e1d703a0372e229865dbe57d5fba87d2985995f8598c9481886ec754096627df974ace3450326ce71881e88bcfd7dabba03adf8a1b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}