{
  "manageEntity": {
    "action": "Save",
    "entityId": "737221",
    "entityType": "Track",
    "nonce": "0x7fdc0e5e463a5ff1e23a4bcc9d1e58b549e062048dde3cce60a004902f3a88c8",
    "signature": "0xd4e83d11262a62829d192a31c0da4de797cd42abbc5148018be454f2f39f4b3b4d38f85da03fc83e579aca429349f1b5f0078dd6f000bd8924d38e5d0ffb36b01b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}