{
  "manageEntity": {
    "action": "Save",
    "entityId": "629945776",
    "entityType": "Track",
    "nonce": "0xd34491c4e4e0a402849508438361f5ec368b4d80779f73904b9fbf7b95772dcb",
    "signature": "0x3b63d0d97c532d86473230afb069f26c74ea189c9ffc2e161b3cdbd1f5752a0a4219db012f5af6d17a2235fa11b7c9667e76ded6a74371e43560585c839516891b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}