{
  "manageEntity": {
    "action": "Save",
    "entityId": "300222341",
    "entityType": "Track",
    "nonce": "0x67dd71a5693508b33d4042b5d3e55ef7884a9f5a59d23ee82cd43c0658f87e5a",
    "signature": "0xf7b545a39457e45acc706856fa16c06fc655918540d9c078c3b239e2cda8722e0891ddeb8b85abb8ff715ade389902a8fb39dc20627d11cf982a54d650ad3cf01c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}