{
  "manageEntity": {
    "action": "Save",
    "entityId": "440739",
    "entityType": "Track",
    "nonce": "0x6d70ac23ec4e2b9abe689e843fb4015b6b7363247df267d61f3c7f9e62e20d53",
    "signature": "0x657fb26eecf054a43321be9a15049dc6a2602ef2a40ed74aba74b9a1da016ecc39166fa5f087ba486c605431e2deaf27e15712d37fbbdae6427b68e436a22f171b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}