{
  "manageEntity": {
    "action": "Save",
    "entityId": "574199",
    "entityType": "Track",
    "nonce": "0x870cbc7287246b4c77155dddd21168109c73d99f5e19ec79cdf6203be2ec6894",
    "signature": "0x78c088677fdfe18780a83722bba98d2ea011f36d16489e5af5440f1d209e03db137be22dbb49e296d1bf44ae61df2a499b5a8f84480b598f42b94f228b20862a1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}