{
  "manageEntity": {
    "action": "Save",
    "entityId": "472060",
    "entityType": "Track",
    "nonce": "0x9103a4c5517590e8898af8e026aaec374920848218b60493ed688d464ef05e84",
    "signature": "0x4872a47bf65a902ec1a6e316cd12df51374a4dfbd65efca960ff593f2fd54d995ce3b1bf2501c067da547413e6fa2b2df628bce7612d88501bfe2e4224df65211c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}