{
  "manageEntity": {
    "action": "Save",
    "entityId": "4466944",
    "entityType": "Track",
    "nonce": "0x87f93a66a8eda7e11ad20260425b2817782c771e2cd6061d1ccf36360c35e194",
    "signature": "0xcd7ced43a48eb69e0bf61a14e20b371c56cb6be5098c2f846e16dcba0dd8a709684c31fd154c7840d5bba0b9215886ec8d0ba906b57fcac0bbaceb01dcd213aa1b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}