{
  "manageEntity": {
    "action": "Save",
    "entityId": "1587782406",
    "entityType": "Track",
    "nonce": "0x9457dbad87b51552d11df40c909d10299aa60dd45d4543781ae40792150726cf",
    "signature": "0x34aad9cf0834fd74d6fd6669f08ce8f613939621f857daf5eda0c8a6d9a5def576f5ade0a3283cb5ad3fffb478f0ce234ae269c3b510718e4f7b340c618706331b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}