{
  "manageEntity": {
    "action": "Save",
    "entityId": "664240519",
    "entityType": "Track",
    "nonce": "0x376b5ae0d37227842c61c1f9be583dac4708f4de6452c63df25de7bdb8fb4f4f",
    "signature": "0x058b3fa31afe67b9903644e2a9ec4e94de578d7fd7b360eb7853ea5eca1bd4415e63c67a143d4d0cb1971b7b841835eadf09f620f3abbbf08f0a0e76a1c520861c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}