{
  "manageEntity": {
    "action": "Save",
    "entityId": "603261571",
    "entityType": "Track",
    "nonce": "0xc5c5c5f5fa9cd70fc189de7eb7632feca6c3900fcf8d2bfb4f387a2341cb81aa",
    "signature": "0xd03a37c485116965a6676ddf4d4fc81fde9f15f69c4caa6a0790a17b5099f4e7292c25d6826fd2534435c8d5f88704b0382f8911086e88cc3f6d638eb02bdd861b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}