{
  "manageEntity": {
    "action": "Save",
    "entityId": "403504335",
    "entityType": "Track",
    "nonce": "0xa69bc3d0d2d812bc2a4fd8f35abcb5f14ef1b3281b9a408d86b76c0e6065f018",
    "signature": "0x689fc614a13805e82c49cfc253385949e91fc90622a3eacf2e6760cf5645662130962214edbc468eb831393a2f2ab4b497d5b6c848a2fd4db171de17b545870b1b",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}