{
  "manageEntity": {
    "action": "Save",
    "entityId": "602219518",
    "entityType": "Track",
    "nonce": "0x4fbbf2553617108ec0a20a238d408b5549761cb65e77842139ec36692c11ff6c",
    "signature": "0x33a78596f89733fc54dd5c463ca718041824b915aa7d4844dd9302378f80d8d53ed0cf3ea4128c732145025b381c68dd86cc59c8bc0d3f2be16bb7ccc60f99661c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}