{
  "manageEntity": {
    "action": "Save",
    "entityId": "754882675",
    "entityType": "Track",
    "nonce": "0xd0c145308910766fd5e74c1029c4263c21b4ba3f5f938860702a52a6b72f3772",
    "signature": "0x40e8f1708c82739627a41d51baf5a428b6d0f857d06db3926215bd40f30a2f7d0ea88d5e0cadee2ce2609f0370c15b004cb02d09eb7cc30b11daa089e0fc0bd91c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}