{
  "manageEntity": {
    "action": "Save",
    "entityId": "960721613",
    "entityType": "Track",
    "nonce": "0xeef05895a5b0381bf8cdc2456c66b765ae447da2374db3648c6f56222939db8a",
    "signature": "0xe9a69f8b38d28b65ab563240394f2062c2df39dbb2e7c2e84e3c2bf870a29a7b64d42fba8b18a0308905d9c76427bb28777b7962f94776a3c4738826637f84be1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}