{
  "manageEntity": {
    "action": "Save",
    "entityId": "1510869039",
    "entityType": "Track",
    "nonce": "0xa8ea70512161630b238b1b57bad5156cd4523ccaf3cf722e519cdb1ca82b2356",
    "signature": "0x0ab48258d8e35de059589ea9f4a263573cc569b6143d3cb1bb53756b70bcab7a216e4c284ce5130c624dbd0455fd1173afc6d2bb044de6bdc83b03d8a1cd55ff1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}