{
  "manageEntity": {
    "action": "Save",
    "entityId": "1577652447",
    "entityType": "Track",
    "nonce": "0x4668c88ab68c1e7f2e5962c26d3b1650968131199fafc5e275c3cb721080b878",
    "signature": "0xcf47d4737d56c41d8490dce5428b174d7fa117fb901127e0f12079b6697046a805a803cea6e99fd84d869b093f11eabcb80d7590324eb949fea5be440637de451b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}