{
  "manageEntity": {
    "action": "Save",
    "entityId": "294467",
    "entityType": "Track",
    "nonce": "0x83dd01d6949ec41a46e3912e6ea74d53bc019945b4cbd51e0ec8c24c2e2f5008",
    "signature": "0xf4ac9364ab99b0c715681644e83c97292775c6f9743406b45f64f1ab63c2b15e5642733e5e5935c7a2e9349f0ecd8ad7b9f5f87899d61d54dfed80cc5cff50221c",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}