{
  "manageEntity": {
    "action": "Save",
    "entityId": "386614520",
    "entityType": "Track",
    "nonce": "0x57749620330c356c1241d81c0bea0d4d92a879cae07b94dad448d7fafc0fe063",
    "signature": "0xb9f4d6c545033a210cd8a4d70d0073d748fae2b34e1954f42eaf366fb7ca49c82056202ce09e39ba105c5efdd1dcb1e17cc4a10180b6fe2888dd8a7e27569c771b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}