{
  "manageEntity": {
    "action": "Save",
    "entityId": "251250004",
    "entityType": "Track",
    "nonce": "0x6c2d23682a14a721a3a0a743c16259123e75c504620c4efcfc701eb362d1a066",
    "signature": "0xb77cce35d2a5dba15a771f59761a612b54d48d87043110b594ebe24994f635cb7697bebb199edab10f4f0afc93df6cb1a4ff360b79e2177728fffb84024e26501c",
    "signer": "0x7b52e6AA15Db4Fc3A84AFF2b12e5B8B128eA8610",
    "userId": "808512351"
  }
}