{
  "manageEntity": {
    "action": "Save",
    "entityId": "538763",
    "entityType": "Track",
    "nonce": "0x168dae37b792cec73c3b0bc201eb93848da52c01c6b817f390d93b630841e52d",
    "signature": "0x9345da842155c7e050aeeec235f824aff0e1caa9cb6bc032f19d58c13e76ee4b2d407ec268277cb4e52be7b07cecc8522c191ececbbb803d9a4054c19a0e47f71b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}