{
  "manageEntity": {
    "action": "Save",
    "entityId": "148054936",
    "entityType": "Track",
    "nonce": "0xfc3e0a7faa39a27fa76aa4c57b852bf63b7f220e46ce86fcf992c0b611146d1b",
    "signature": "0x615ebf42008ffa2ab502f9f4114bf6525d3f40ce6af3e696b5cb7274ca6af86e6ab7920cd061018687346ebdd3b602454f94313d354ab0d233ebac6e62dc1b541c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}