{
  "manageEntity": {
    "action": "Save",
    "entityId": "431971884",
    "entityType": "Track",
    "nonce": "0xeaaa6637ab892032b890dffbd4c36e89557a617dfe1d8d32a20c6996e51907b4",
    "signature": "0x726f69535c1325b92ba539a4600e55f021f0ad9e493e388e75ff354531b3039a370c99f30623e58228de9b8cd29891e35552250a21541a9a2f2e32345e68070a1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}