{
  "manageEntity": {
    "action": "Save",
    "entityId": "992663960",
    "entityType": "Track",
    "nonce": "0x4e5da694c28a59f453bfb212139f61da753009808785129359c4e9b2f6ee38a8",
    "signature": "0x9efdb9d1dc78587366718879a44aec8e203bd7ac9307bc8ccdec14c79342bcf3782791dea402e2d9d005815e697eb5cfb1d5bb510c46a5de26efd15b70f6c6151b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}