{
  "manageEntity": {
    "action": "Save",
    "entityId": "1737880300",
    "entityType": "Track",
    "nonce": "0x4df2d4cc2df2bb1d777c04f2dd3d9fd68d34fcf8d310ad1639ded65a16786b01",
    "signature": "0x89c663a6d9387b22ebf5859118b9acb56680e99991f1fce6b13271d21b038a4307461db3b932cbfddbaa8ec50b83cf150bc28033dff5fcb073dd6784ded15f931b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}