{
  "manageEntity": {
    "action": "Save",
    "entityId": "1889192569",
    "entityType": "Track",
    "nonce": "0xb9e9f97dcd79416e87f9f560d86d4f34470e4574eb3f8cbec493141bfbc74393",
    "signature": "0x96ba267e1d24907601183a8faa3c266ab4b724f5ee407a2e959d9e9e867e55446e2c2f4ad63dbdd8daeeea7c58f586aac928f910305e86691588745a18dbd6631b",
    "signer": "0x19ee5E3A31ce66CE689e96b87E3583f3B75fD98A",
    "userId": "124060"
  }
}