{
  "manageEntity": {
    "action": "Save",
    "entityId": "1087432407",
    "entityType": "Track",
    "nonce": "0x505a978896ee3be344e601f9a734c4c0924cc84e3b352ccdbab754dfcceb4e25",
    "signature": "0x7652793f65e76f1ed0cbb2e865a41f9810d9219b97d6253d7bc1839673204dd51a4491f9b1d838ce760dae635c991d6d0da878af6f7abbfb73933f0ccca4ff571c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}