{
  "manageEntity": {
    "action": "Save",
    "entityId": "964965117",
    "entityType": "Track",
    "nonce": "0x7db3c8441ce445d794f8a0fc9010d4f30ac02ba1788dcfaf8d2e7c4158cce467",
    "signature": "0x72222f94f7a58487792a3c9d4b14a5649721295db5f14ecf0a5e58b2c4ff68a42b55943bacd537df6eba867a343578e833e74aba787c9442f9030a39e4a6da3f1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}